706 s1 318-326 gps09 - light-and-sound - home · pdf filewhat sound does a ruler make? ......

34
BIG Idea Science Journal Sound and light are waves that are described by their frequency, amplitude, and wavelength. 11.1 Sound Sound waves are compressional waves generated by a vibrating object. 11.2 Reflection and Refraction of Light Light waves can be absorbed, transmitted, or reflected when they interact with matter. 11.3 Mirrors, Lenses, and the Eye Images of objects seen by the eye can be changed by mirrors and lenses. 11.4 Light and Color The color of an object depends on the wavelengths of light emitted or reflected by the object. Cracking the Sound Barrier Have you ever heard the crack of a sonic boom? A sonic boom occurs when a plane exceeds the speed of sound. Sound waves create a cone-shaped shock wave coming from the aircraft. Behind the cone are low- pressure regions that can cause water vapor to con- dense, forming the cloud you see here. Write three things you would like to learn about sound. MAIN Idea MAIN Idea MAIN Idea MAIN Idea 318 318 AFP/CORBIS

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Page 1: 706 S1 318-326 GPS09 - Light-and-Sound - home · PDF fileWhat sound does a ruler make? ... sound waves cannot travel in empty space where there are no particles. ... sound travels

BIG Idea

Science Journal

Sound and light are waves thatare described by their frequencyamplitude and wavelength

111 SoundSound waves are

compressional waves generatedby a vibrating object

112 Reflection andRefraction of Light

Light waves can beabsorbed transmitted or reflected when they interactwith matter

113 Mirrors Lenses andthe Eye

Images of objectsseen by the eye can be changedby mirrors and lenses

114 Light and ColorThe color of an

object depends on the wavelengths of light emitted orreflected by the object

Cracking the SoundBarrierHave you ever heard thecrack of a sonic boom Asonic boom occurs when aplane exceeds the speed ofsound Sound waves create a cone-shaped shock wavecoming from the aircraftBehind the cone are low-pressure regions that cancause water vapor to con-dense forming the cloud you see here

Write three things you wouldlike to learn about sound

MAIN Idea

MAIN Idea

MAIN Idea

MAIN Idea

318318AFPCORBIS

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319319

Sound and Light Make the

following Foldable to help you

identify ways in which sound

and light are different and alike

Fold one sheet of paper lengthwise

Fold into thirds

Unfold and draw overlapping ovals

Cut the top sheet along the folds

Label the ovals as shown

Constructing a Venn Diagram As you read the

chapter list the characteristics unique to sound

under the left tab the characteristics unique to

light under the right tab and those common to

both under the middle tab

STEP 4

STEP 3

STEP 2

STEP 1

What sound does a ruler make

Musical instruments come in many shapes

and sizes Some have strings some have hol-

low tubes and others have keys or pedals

They are played with various techniques

These differences give each instrument a

unique sound What would an instrument

made from a ruler sound like

1 Complete the safety form

2 Firmly hold one end of a thin ruler lying

flat on a desk allowing the free end to

extend beyond the edge of the desk

3 Gently pull up on and release the end of

the ruler What do you see and hear

4 Vary the length of the overhanging por-

tion and repeat the experiment several

times

5 Think Critically In your Science Journal

write instructions for playing a song with

the ruler Explain how the length of the

overhanging part of the ruler affects the

sound

Start-Up Activities

Preview this chapterrsquos contentand activities at gpesciencecom

Sound LightBoth

AFPCORBIS

320 CHAPTER 11 Sound and Light

Sound WavesAn amusement park can be a noisy place With all the racket

of carousel music and booming loudspeakers it can be hard tohear what your friends say The many sounds you hear every dayare different but they do have something in commonmdasheachsound is produced by an object that vibrates

Making Sound Waves When an object like the tuning forkin Figure 1 vibrates it creates sound waves Sound waves arecompressional waves Recall that a compressional wave is made ofcompressions and rarefactions When an end of the tuning forkmoves outward it forms a compression on that side by pushingthe molecules in air together The compression moves away fromthe tuning fork as these molecules collide with other molecules inair When the end of the tuning fork moves back a rarefaction isformed where the molecules are farther apart As the tuning forkvibrates it produces a series of compressions and rarefactions thattravels outward This series of compressions and rarefactions isthe sound wave that you hear

The Speed of SoundA sound wave moves in air as collisions between the mole-

cules in air transfer energy from place to place Sound waves alsocan move in other materials The material in which a sound wavemoves is called a medium Just as in air sound waves travel insolids liquids and other gases as a vibrating object transfersenergy to the particles in the material However sound wavescannot travel in empty space where there are no particles

Sound

Figure 1 A vibrating tuning fork

produces compressions and rarefac-

tions that travel outward from the

tuning fork These compressions

and rarefactions form a sound

wave

Reading Guide

Explain how sound travels

through different mediums Explain different properties of

sound Discuss the Doppler effect Identify ways sound can be used

Sounds are one way that you learn

about the world around you

Review Vocabulary

vibration rhythmic back-and-forth

motion

New Vocabulary

bull intensity

bull loudness

bull decibel

bull pitch

bull Doppler effect

Compression

Rarefaction

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SECTION 1 Sound 321

The Speed of Sound in Different Materials The speedof a sound wave in a medium depends on the type of substanceand whether it is a solid liquid or gas For example Table 1

shows the speed of sound in different mediums at room temper-ature In general sound travels slowest in gases and fastest insolids

Temperature and the Speed of Sound The speed ofsound waves also depends on the temperature of the mediumAs the temperature of a substance increases its atoms andmolecules move faster At a higher temperature atoms andmolecules collide with each other more frequently As a resultsound waves move faster For example in air at a temperature of0C sound travels at a speed of 331 ms but in air at a temper-ature of 20C sound travels at 343 ms

Amplitude and Energy of Sound WavesThink about the differences among sounds you hear Some

are loud others are soft The flute plays high notes whereas thetuba is much lower What properties of sound waves cause thesedifferences in the sounds you hear

Recall that the amount of energy a wave carries correspondsto its amplitude For a compressional wave amplitude is relatedto the density of the particles in the compressions and rarefac-tions A vibrating object makes a wave by transferring energy tothe medium More energy is transferred to the medium whenthe particles of the medium are forced closer together in thecompressions and spread farther apart in the rarefactions Lookat Figure 2 A sound wave has a higher amplitude and carriesmore energy when particles in the medium are closer togetherin the compressions and more spread out in the rarefactions

Compression Rarefaction

Low-amplitude sound wave

Compression Rarefaction

High-amplitude sound wave

Figure 2 The amplitude of a

sound wave depends on the density

of the particles in the compressions

and rarefactions

In a high-amplitude sound wave

particles are tightly packed in the

compressions and far apart in the

rarefactions

In a low-amplitude sound wave

particles are less tightly packed in

the compressions and not as far

apart in the rarefactions

Table 1 Speed of Soundin Different Mediums

Medium Speed of Sound (ms)

Air (20degC) 343

Cork 500

Water 1498

Brick 3650

Aluminum 5000

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Intensity and LoudnessImagine you are listening to music from your CD player

Sound waves produced by the CD player travel through the airand transfer energy from the CD player to your ears The energythat reaches your ears depends not only on the amplitude of thesound waves but also on how close you are to the CD playerFigure 3 shows that as you get farther from a source of soundthe energy of the sound waves is spread over a greater area Theamount of energy transferred by a sound wave through a certainarea each second is the intensity of the sound wave As soundwaves travel away from the source of the sound the intensity ofthe waves decreases as the waves spread out This means that asyou get farther from the source less energy reaches your earseach second

Loudness When you hear different sounds you do not needspecial equipment to know which sounds have greater intensityYour ears and brain can tell the difference Loudness is thehuman perception of sound intensity As the intensity of asound wave increases the loudness of the sound also increases

How are intensity and loudness related

A Scale for Sound Intensity The intensity of sound can bedescribed using a measurement scale Each unit on the scale forsound intensity is called a decibel abbreviated dB On this scalethe faintest sound that most people can hear is 0 dB Soundswith intensity levels above 120 dB may cause pain and perma-nent hearing loss During some rock concerts sounds reach thisdamaging intensity level Wearing ear protection such asearplugs around loud sounds can help protect against hearingloss Figure 4 shows some sounds and their intensity levels indecibels

Figure 4 The decibel scale meas-

ures the intensity of sound

Identify where a normal speakingvoice would fall on the scale

Figure 3 The intensity of a

sound wave decreases as the wave

spreads out from the source of the

sound The energy of the wave is

spread over a larger area as the

wave spreads out

Whisper

Rustling

leaves

Noisy

restaurant

20 25 50 75 80 100 110 12015

Purring

cat

Average

home

Vacuum

cleaner

Jet plane

taking off

Power

mowerPain

threshold

0dB 150

Loudness in Decibels

322 CHAPTER 11 Sound and Light

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SECTION 1 Sound 323

Pitch and FrequencyYou might be familiar with the music

scale do re mi fa sol la ti do shown inFigure 5 If you were to sing this scale youwould hear the pitch of your voice gethigher Pitch is the human perception ofthe frequency of sound waves Pitch getshigher as the frequency of the sound wavesincreases

Frequency Frequency is a measure of how many wavelengthspass a particular point each second For a compressional wavesuch as sound the frequency is the number of compressions orthe number of rarefactions that pass by each second Frequencyis measured in hertz (Hz) A frequency of 1 Hz means that onecomplete wavelength passes by in 1 s

A healthy human ear can hear sound waves with frequenciesfrom about 20 Hz to 20000 Hz The human ear is most sensi-tive to sounds in the range of 440 Hz to about 7000 Hz In thisrange most people can hear much fainter sounds than they canat higher or lower frequencies

Ultrasonic and Infrasonic Waves Most people canrsquot hearsound frequencies above 20000 Hz which are called ultrasonicwaves Dogs can hear sounds with frequencies up to about35000 Hz and bats can detect frequencies higher than 100000Hz Even though humans canrsquot hear ultrasonic waves they havea number of uses For example ultrasonic waves directed intothe human body are used in medical diagnosis and treatmentUltrasonic waves are reflected by objects underwater and can beused to determine the size shape and depth of underwaterobjects

Infrasonic or subsonic waves have frequencies below20 Hzmdashtoo low for most people to hear These waves are pro-duced by sources that vibrate slowly such as wind heavymachinery and earthquakes Although you canrsquot hear infrasonicwaves you might feel them as a rumble inside your body

The Doppler EffectImagine that you are standing at the side of a racetrack with

race cars zooming past As they move toward you the pitches oftheir engines become higher As they move away the pitchesbecome lower The change in pitch or frequency due to therelative motion of a wave source is called the Doppler effect

Figure 5 Every note has a

different frequency which gives it

a distinct pitch

Describe how pitch changes whenfrequency increases

C

do

262

Hz

D

re

294

Hz

E

mi

330

Hz

F

fa

349

Hz

G

sol

392

Hz

A

la

440

Hz

B

ti

494

Hz

C

do

523

Hz

Comparing IntensityProcedure 1 Complete the safety form

2 Tie the middle of a 50-cm

length of string to a metal

object such as a spoon3 Wrap each end of the

string around a finger on

each hand Place one of

these fingers in each ear

4 Swing the object so it

bumps against a table or

a chair Note the sound

5 Take your fingers out of

your ears and repeat

step 4

Analysis1 Compare the sounds you

heard in both trials

2 Compare the intensity of

the sound waves that

reached your

ears in both

trials

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324 CHAPTER 11 Sound and Light

A Moving Source of Sound As a race car moves it producessound waves in the form of compressions and rarefactions InFigure 6A the race car creates a compression labeled ACompression A moves through the air toward the flagger By thetime compression B leaves the race car in Figure 6B the car hasmoved forward Because the car has moved since the time it createdcompression A compressions A and B are closer together in frontof the car than they would be if the car had stayed still Because thecompressions are closer together more compressions pass by theflagger each second than if the car had been at rest As a result theflagger hears a higher pitch Figure 6B also shows that the compres-sions behind the moving car are farther apart resulting in a lowerfrequency The flagger hears a lower pitch after the car passes

A Moving Listener You also can hear the Doppler effect whenyou are moving past a sound source that is standing still Supposeyou were riding in a school bus and passed a building with a ring-ing bell The pitch would become higher as you approached thebuilding and lower as you rode away from it The Doppler effecthappens any time the source of a sound is changing position rel-ative to the listener It occurs no matter whether it is the soundsource or the listener that is moving The faster the change inposition the greater the change in frequency and pitch

How does pitch change if you are moving awayfrom a sound source

The race car creates compression A which

spreads through the air in all directions from the

point where it was created

The car is closer to the flagger when it creates

compression B Compressions A and B are closer

together in front of the car so the flagger hears a

higher-pitched sound

Figure 6 The Doppler effect occurs when the

source of a sound wave is moving relative to a

listener

Compression A

Compression B

Compression A

Red Shift The Dopplereffect can also beobserved in light wavesemanating from movingsourcesmdashalthough thesources must be movingat tremendous speedsAstronomers have learnedthat the universe isexpanding by observingthe Doppler effect in lightwaves Research thephenomenon known asred shift and explain inyour Science Journal howit relates to the Dopplereffect

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SECTION 1 Sound 325

Using SoundWhen sound waves strike an object they can be absorbed by

the object transmitted through the object or reflected from theobject By detecting the sound waves reflected from an objectthe size shape and location of an object can be determined

Echolocation and Sonar Some species of bats as well asdolphins whales and other animals use sound waves to detecttheir prey Echolocation is the process of locating objects byemitting sounds and detecting the sound waves that reflect back

Sonar is a system that uses the reflection of underwater soundwaves to detect objects First a sound pulse is emitted underwa-ter The sound waves travel in the water and are reflected whenthey strike an object such as a fish or a ship An underwatermicrophone detects the reflected waves Because the speed ofsound in water is known the distance to the object can be calcu-lated by measuring how much time passes between when thesound pulse is emitted and when the reflected signal is received

USING SONAR A sonar pulse returns in 300 s from a sunken ship that is directly below Find

the depth of the ship if the speed of the pulse is 1500 ms Hint The sonar pulse travels a

distance equal to twice the depth of the ship so use the equation d = st2 to find the depth

known values and the unknown value

Identify the known values

speed of sound in water s 1500 ms

time for round trip t 300 s

Identify the unknown value

depth of the ship d m

the problem

Substitute the known values s 1500 ms and t 300 s into the equation for depth

d s2t

(1500 m2s)(300 s)

12

(4500 m) 2250 m

your answer

Check your answer by dividing the distance by the time and multiplying by 2 The result

should be the speed of sound given in the problem

CHECK

SOLVE

means

means

means

IDENTIFY

Solve a Simple Equation

Find the speed of a sonar pulse that returns in 20 s from a ship at a depth of 1500 m

For more practice problems go to page 879 and visit Math Practice at gpesciencecom

Topic SonarVisit for Web

links to information about ways

sonar is used

Activity Research to find out

the different types of sonar Make

a poster that describes active and

passive sonar

gpesciencecom

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326 CHAPTER 11 Sound and Light

Self Check

1 Explain how sound travels from your vocal cords to

your friendrsquos ears when you talk

2 Explain how the loudness of a sound wave depends on

the intensity of the sound wave

3 Draw and label a diagram that explains the Doppler

effect

4 Describe at least three uses of ultrasonic technology in

medicine

5 Think Critically How could sonar technology be used

to locate deposits of oil and minerals

Summary

Sound Waves

bull Sound waves are compressional waves that

are produced by vibrating objects

bull Sound usually travels fastest in solids and

slowest in gases

bull Sound travels faster as the temperature of

the medium increases

Properties of Sound

bull The amplitude of sound waves increases as

the density of particles increases in the com-

pressions and decreases in rarefactions

bull Loudness is the human perception of the

intensity of sound waves Pitch is the human

perception of the frequency of sound waves

bull The Doppler effect is the change in the fre-

quency of a sound wave when the source of

the sound is moving relative to a listener

6 Calculate Time How long would it take a sound

wave from a car alarm to travel 10 km in air if the air

temperature were 0degC

7 Calculate Distance If sound travels in the ocean with

a speed of 1500 ms how far will a sonar pulse travel

in 45 s

Ultrasound in Medicine High-frequency soundwaves can also be used to remove dirt buildup on jew-elry and glassware One of the most important uses ofultrasonic waves though is in medicine Using spe-cial instruments medical professionals can sendultrasonic waves into a specific part of a patientrsquosbody Reflected ultrasonic waves are used to examinedifferent body parts and to detect and monitor cer-tain types of heart disease and cancer Ultrasoundimaging also is used to monitor the development of afetus as shown in Figure 7 However ultrasound doesnot produce good images of the bones and lungsbecause hard tissues and air absorb the ultrasonicwaves instead of reflecting them

High-frequency sound waves can be used to treatcertain medical problems For example sometimes small harddeposits of calcium compounds or other minerals form in thekidneys making kidney stones In the past physicians had toperform surgery to remove kidney stones Now ultrasonic treat-ments are commonly used to break them up instead Bursts ofultrasound create vibrations that cause the stones to break intosmall pieces that can easily pass out of the body with the urineA similar treatment is available for gallstones

Figure 7 Ultrasonic waves are

directed into a pregnant womanrsquos

uterus to form images of her fetus

More Section Review gpesciencecom

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Opaque

Translucent

Transparent

SECTION 2 Reflection and Refraction of Light 327

The Interaction of Light and MatterLook around your darkened room at night You know that

some of the objects are brightly colored but they look gray orblack in the dim light Turn on the light and you can see all theobjects in the room clearly including their colors What you seedepends on the amount of light in the room and the color of theobjects For you to see an object it must reflect or emit somelight that reaches your eyes

Absorption Transmission and Reflection Objects canabsorb light reflect light and transmit lightmdashallow light to passthrough them The type of matter in an object determines theamount of light it absorbs reflects and transmits For examplethe opaque material in the top candleholder in Figure 8 onlyabsorbs and reflects lightmdashno light passes through it As a resultyou cannot see the candle inside Materials that allow some lightto pass through them like the material of the middle candle-holder in Figure 8 are described as translucent You cannot seeclearly through translucent materials

Transparent materials such as the bottom candleholder inFigure 8 transmit almost all the light striking them so you cansee objects clearly through them Only a small amount of lightis absorbed and reflected by transparent materials

Reflection andRefraction of Light

Reading Guide

Describe how light waves interact

with matter Explain the difference between

regular and diffuse reflection Define the index of refraction of a

material Explain why a prism separates

white light into different colors

The images you see every day are

due to the behavior of light waves

Review Vocabulary

visible light an electromagnetic

wave with wavelengths between

about 400 and 700 billionths of a

meter

New Vocabulary

bull opaque

bull translucent

bull transparent

bull index of refraction

Figure 8 These candleholders

interact with light differently

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328 CHAPTER 11 Sound and Light

Reflection of LightHave you glanced in a mir-

ror today You see your reflec-tion in the mirror when light isreflected off you strikes themirror and is reflected off themirror into your eye Becauselight behaves as a wave itobeys the law of reflection asshown in Figure 9 Recall thataccording to the law of reflec-tion the angle at which a lightwave strikes a surface is thesame as the angle at which it is

reflected Light reflected from any surfacemdasha mirror or a sheetof papermdashobeys this law

Regular and Diffuse Reflection Why can you see yourreflection in a store window but not in a sheet of paper Theanswer has to do with the smoothness of the surfaces A smootheven surface such as a pane of glass produces a sharp image byreflecting parallel light waves in only one direction Reflection oflight waves from a smooth surface is regular reflection To causea regular reflection the roughness of a surface must be less thanthe wavelengths it reflects A sheet of paper has an uneven sur-face that causes incoming parallel light waves to be reflected inmany directions as shown in Figure 10 Reflection of light froma rough surface is diffuse reflection

Scattering Diffuse reflection is a type of scattering thatoccurs when light waves traveling in one direction are made totravel in many different directions Scattering also occurs whenlight waves traveling through the air reflect off small particlesAn example is light scattering off the small water droplets thatmake up a cloud Scattering causes the cloud to appear whiteeven though the droplets are transparent

What is scattering of light

Figure 9 According to the law of

reflection light is reflected so that

the angle of incidence always

equals the angle of reflection

Figure 10 A sheet of paper

has an uneven surface that

produces a diffuse reflection

Explain Use the law ofreflection to explain why arough surface causes parallellight waves to be reflected inmany directions

Mirror

i = angle of

incidence

i

r

i

r

r = angle of

reflection

Normal

Normal

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Refraction of LightWhat occurs when a light wave passes from one material to

anothermdashfrom air to water for example Recall that refractionis caused by a change in the speed of a wave when it passes fromone material to another If the light wave is traveling at an angleto the boundary between the materials and the speed of light isdifferent in the two materials the wave will be bent or refracted

Why does refraction occur

The Index of Refraction The amount of bending that takesplace depends on the speeds of light in both materials Thegreater the change in speed the more the light will be bent asit passes at an angle from one material to the other Figure 11

shows an example of refraction Every material has an index ofrefraction which is the ratio of the speed of light in a vacuum tothe speed of light in the material The index of refraction indi-cates how much the speed of light is reduced in the materialcompared to its speed in empty space

The larger the index of refraction the more light is sloweddown in the material For example because glass has a largerindex of refraction than air light moves more slowly in glassthan air The index of refraction is usually largest for solids andsmallest for gases

Prisms A sparkling glass prism hangs in a sunny windowrefracting the sunlight and projecting a colorful pattern onto thewalls of the room How does the refraction of light create thesecolors The spectrum of colors is produced because the speed oflight in a material also depends on the wave-length of the light In a glass prism light waveswith longer wavelengths such as red light wavesare slowed less than light waves with shorterwavelengths such as blue light waves

Figure 12 shows what occurs when whitelight passes through a prism White light suchas sunlight is made up of light waves withrange of wavelengths from red to blue The tri-angular prism refracts the light twicemdashoncewhen it enters the prism and again when itleaves the prism and reenters the air Becausethe longer wavelengths of light are slowed lessthan the shorter wavelengths are red light isbent the least As a result of these differentamounts of bending the different colors areseparated when they emerge from the prism

Figure 11 The spoon looks

broken because light waves are

refracted as they change speed

when they pass from the water to

the air

329

Figure 12 Refraction causes a

prism to separate a beam of white

light into different colors

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330 CHAPTER 11 Sound and Light

Self Check

1 Compare and contrast opaque transparent and

translucent materials Give one example of each

2 Discuss why you can see your reflection in a smooth

piece of aluminum foil but not in a crumpled ball of foil

3 Infer what happens to light waves that are reflected off

dust particles in the air

4 Explain what happens to white light when it passes

through a prism

5 Think Critically Suppose a material has the same index

of refraction as water How would a light wave change

direction as it traveled from water into this material

Summary

Light and Matter

bull The amount of light that is absorbed

reflected or transmitted depends on the

material making up the object

Reflection of Light

bull Light waves always obey the law of reflection

the angle of incidence equals the angle of

reflection

bull Regular reflection causes parallel light waves

to be reflected in only one direction

bull Diffuse reflection causes parallel light waves

to be reflected in many directions

bull Scattering occurs when light waves are reflected

and travel in many different directions

Refraction of Light

bull Refraction occurs when a light wave changes

speed in moving from one material to another

bull The index of refraction of a material indicates

how much light slows down in the material

6 Find an Angle A light wave strikes a mirror at an

angle of 42deg from the surface of the mirror What

angle does the reflected wave make with the normal

7 Find an Angle A light wave reflects from a mirror at

27deg from the normal What was the angle between

the mirror and the incident wave

Mirages When yoursquore traveling in a car you might see whatlooks like a pool of water on the road ahead As you get closerthe water seems to disappear Yoursquove seen a miragemdashan image ofa distant object produced by the refraction of light through airlayers of different densities Mirages result when the air atground level is much warmer or cooler than the air above asshown in Figure 13 The density of air increases as air cools andlight waves move slower in cooler air than in warmer air As aresult light waves are refracted as they pass through air layerswith different temperatures

Figure 13 Mirages result when

air near the ground is much

warmer or cooler than the air

above This causes light waves

reflected from an object to refract

creating one or more additional

images

MirageWarm air

Cool air

More Section Review gpesciencecom

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SECTION 3 Mirrors Lenses and the Eye 331

Light RaysLight sources send out light waves in all directions These

waves spread out like ripples on the surface of water spread outfrom the point of impact of a pebble You can think of the lightcoming from the source as being many narrow beams of light trav-eling in all directions Each narrow light beam is called a light ray

MirrorsA mirror is any surface that produces a regular reflection A pool

of still water a metal pan and even the back of a shiny spoon can bemirrors Mirrors can be flat curved inward or curved outward

Plane Mirrors A flat smooth mirror is a plane mirror Whenyou look in a plane mirror your image appears upright If youstand 1 m from the mirror your image appears 1 m behind themirror or 2 m from you In fact your image is what a friend stand-ing 2 m from you would see Figure 14 shows how your image isformed First light rays from a light source strike you Every pointthat is struck by the light rays reflects these rays so they travel out-ward in all directions If your friend were looking at you thesereflected light rays coming from you would enter her eyes so shecould see you However if a mirror is placed between you and yourfriend light rays are reflected from the mirror back to your eyes

Mirrors Lenses andthe Eye

Reading Guide

Describe how images are formed

by three types of mirrors Explain how convex and concave

lenses form images Explain how the human eye

enables you to see Describe how lenses are used to

correct vision problems

Mirrors and lenses are used in optical

instruments such as cameras and

telescopes

Review Vocabulary

reflection the process of changing

direction after striking a surface

New Vocabulary

bull plane mirror

bull concave mirror

bull convex mirror

bull convex lens

bull concave lens

Figure 14 Seeing an image of

yourself in a mirror involves two

sets of reflections light rays are

reflected from you and then are

reflected by the mirror

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332 CHAPTER 11 Sound and Light

Virtual and Real Images The forma-tion of an image by a plane mirror isshown in Figure 15 Your brain assumesthat light rays travel in a straight line As aresult rays that enter your eyes seem tocome from behind the mirror This makesthe image seem to be behind the mirrorHowever no light rays actually passthrough the place where the image seemsto be located This type of image is called avirtual image Plane mirrors always formvirtual images If light rays from an objectpass through the location of the image theimage is called a real image Curved mir-rors can form both real and virtual images

Concave Mirrors If the surface of a mirror is curved inwardit is called a concave mirror as shown in Figure 16 The opticalaxis is an imaginary straight line drawn perpendicular to thesurface of the mirror at its center Every light ray traveling par-allel to the optical axis is reflected through a point on the opti-cal axis called the focal point The distance from the center ofthe mirror to the focal point is called the focal length

The image formed by a concave mirror depends on the loca-tion of the object relative to the focal point Figure 16 shows acandle located more than twice the focal length from the mirrorAlthough many light rays come from each point on the candleonly two rays from the same point are shown Ray A passesthrough the focal point and then reflects off the mirror movingparallel to the optical axis Ray B travels parallel to the opticalaxis before reflecting off the mirror and passing through thefocal point The point where the two rays meet is the location ofthe image of the original point on the candle The image formedis a real image because light rays from the candle pass throughthe place where the image is located

Figure 16 Rays A and B start from the same

place on the candle travel in different directions

and meet again on the reflected image

Diagram how two other points on the image ofthe candle are formed

Figure 15 Your brain interprets

the light rays reflected by the

mirror as coming from a point

behind the mirror

Infer how the size of your imagein a plane mirror depends on yourdistance from the mirror

Focalpoint

Optical axis

Ray B

Ray A

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SECTION 3 Mirrors Lenses and the Eye 333

Images Produced by a ConcaveMirror When an object is between oneand two focal lengths from a concavemirror the image is real inverted andlarger than the object An object closerthan one focal length from a concavemirror produces a virtual image that isupright and larger than the object Noimage is produced if the object islocated at the focal point

Convex Mirrors When you are in astore look up toward one of the backcorners or at the end of an aisle to see ifa large rounded mirror is mountedthere You can see a large area of the store in such a mirror Amirror that curves outward like the back of a spoon is called aconvex mirror Light rays that hit a convex mirror diverge orspread apart after they are reflected Figure 17 shows how therays from an object are reflected by a convex mirror to form animage The reflected rays diverge and never meet so a convexmirror forms only a virtual image The image also is upright andsmaller than the actual object is

Describe the image formed by a convex mirror

LensesWhat do your eyes have in common with cameras eyeglasses

and microscopes Each of these contains at least one lens A lens is atransparent object with at least one curved surface that causes lightrays to refract The image that a lens forms depends on the shape ofthe lens Like curved mirrors lenses can be convex or concave

Convex Lenses A convex lens is thicker in the middle than atthe edges Its optical axis is an imaginary straight line that is per-pendicular to the surface of the lens at its thickest point When lightrays approach a convex lens traveling parallel to its opticalaxis the rays are refracted toward the center of the lens asin Figure 18 Light rays traveling along the optical axis arenot bent at all All light rays traveling parallel to the opti-cal axis are refracted so they pass through a single pointwhich is the focal point of the lens The less curved thesides of the lens the less light rays are bent As a resultlenses with flatter sides have longer focal lengths Figure 19

on the next page shows that convex lenses can form eitherreal or virtual images

Figure 18 Convex lenses are

thicker in the middle than at the

edges Light rays that are parallel

to the optical axis are refracted so

that they pass through the focal

point A light ray that passes

through the center of the lens is

not refracted

Figure 17 A convex mirror

forms a reduced upright virtual

image

Optical axis

Ray A

Ray B

Focallength

Focalpoint

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Figure 19

VISUALIZING IMAGES FORMED BY A CONVEX LENS

334 CHAPTER 11 Sound and Light

Aconvex lens can form images that are real or virtual enlarged or reduced and upright orinverted Just as for a concave mirror the type of image formed by a convex lens depends on thelocation of the object relative to the focal point of the lens

Optical axis

One

focal

length

Two

focal

lengthsRay B

Image

Ray A

Object

Focal

point

Optical axis

One

focal

length

Two

focal

lengths

Ray B

Ray AObject

Image

Focal

point

Optical axis

Ray B

ObjectRay A

One

focal

length

Focal

pointImage

If the object is more than two focal lengths from the lens the image formed is real inverted andsmaller than the object As the object moves farther from the lens the image becomes smaller

If the object is between one and two focal lengths from the lens the image formed is real invertedand larger than the object As the object moves closer to the focal point the image becomes larger

If the object is less than one focal length from the lens the image is virtual upright and larger thanthe object The image is virtual because the light rays from the object diverge after they pass throughthe lens The image becomes smaller as the object moves closer to the lens

SECTION 3 Mirrors Lenses and the Eye 335

Concave Lenses A concave lens is thinnerin the middle and thicker at the edges Asshown in Figure 20 light rays that passthrough a concave lens bend away from theoptical axis The rays spread out and nevermeet so a real image is never formed Theimage is always virtual upright and smallerthan the object is Concave lenses are used insome types of eyeglasses and some telescopesConcave lenses usually are used in combinationwith other lenses

What type of image is formed by a concave lens

The Human EyeWhat determines how well you can see the words on this

page If you donrsquot need eyeglasses the structure of your eye givesyou the ability to focus on these words and other objects aroundyou Look at Figure 21 Light enters your eye through a trans-parent covering on your eyeball called the cornea The corneacauses light rays to bend so that they converge The light thenpasses through an opening called the pupil Behind the pupil isa flexible convex lens Muscles attached to the lens change itsshape to help focus light forming a sharp image on your retina

The retina is the inner lining of your eye The retina con-tains light-sensitive cells that convert an image into electricalsignals These signals then are carried along the optic nerve toyour brain to be interpreted With this complex structurethe human eye is capable of seeing clearly in bright and dimconditions focusing on both near and far objects and alsodetecting colors

Figure 20 A concave lens

refracts light rays so they spread

out away from the optical axis

Classify Is a concave lens mostlike a concave mirror or a convexmirror

Optical axis

Retina

Focalpoint

Pupil

Cornea

Lens

Optic nerve

Figure 21 The cornea and lens in your eye

bend light rays so that a sharp image is

formed on the retina

Eye Doctors Optometristsand ophthalmologists treatmany different eye prob-lems They often useadvanced technology todiagnose and correct mal-functioning parts of theeye Research an eye prob-lem and how it is treatedWrite a paragraph describ-ing what parts of the eyeare affected by the problemand how doctors correct it

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336 CHAPTER 11 Sound and Light

Brightness and Intensity The human eye can adjust to thebrightness of the light that strikes it If you step outside on asunny day you may have to shade your eyes against the intensityof the sunlight Light intensity is the amount of light energy thatstrikes a certain area each second Brightness is the human per-ception of light intensity Sunlight seems bright because a largeamount of light energy strikes your retina each second Youreyes respond to bright light by decreasing the size of your pupilThis reduces the amount of light that enters your eye and strikesthe retina

Intensity depends on your distance from a light source Ifyou move away from a bare lightbulb you can see how theintensity of the light rapidly decreases Because light rays spreadout from the source less light energy strikes your retina thefarther away you are from the bulb

Correcting Vision ProblemsIf you have good vision you should be able to see objects

clearly when they are 25 cm or farther away from your eyes Asharp image of an object should be formed on your retinaHowever for many people the image is blurry or formed in thewrong place causing vision problems

Farsightedness If you can see distant objects clearly butcanrsquot bring nearby objects into focus then you are farsighted Inthis case the eyeball might be too short or the lens isnrsquot curvedenough to form a sharp image of nearby objects on the retinaas shown in Figure 22 To correct the problem convex lensescan be used to bend incoming light rays so they converge beforethey enter the eye

Experimenting withFocal LengthsProcedure1 Complete the safety form

2 Fill a glass test tube with

water and seal it with a

lid or stopper3 Type or print SULFUR

DIOXIDE in capital letters

on a piece of paper4 Set the test tube horizon-

tally over the words

Record your observations

5 Hold the tube at several

heights above the words

Record your observations

Analysis1 Describe how the words

changed as the height of

the test tube increased

2 Classify the image at each

height as real or virtual

Focal

point

Correctedfarsighted eye

Light fromnearby object

Focalpoint

Light fromnearby object

Farsighted eye

The focal length of a farsighted eye is too long to form

a sharp image of nearby objects on the retina

A convex lens in front of a farsighted eye enables a sharp

image of nearby objects to be formed on the retina

Figure 22 Farsightedness can

be corrected by convex lenses

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SECTION 3 Mirrors Lenses and the Eye 337

Self Check

1 Diagram how light rays from an object are reflected by

a convex mirror to form an image

2 Infer how the size of the image changes if an object

that is less than one focal length from a concave mirror

moves closer to the mirror

3 Explain how the focal length of a convex lens changes

as the sides of the lens become less curved

4 Compare the image of an object less than one focal

length from a convex lens with the image of an object

more than two focal lengths from the lens

5 Think Critically Describe the image formed by a light

source placed at the focal point of a convex lens

Summary

Mirrors

bull A plane mirror forms upright virtual images

bull The image formed by a concave mirror

depends on the location of the object relative

to the focal point

bull Convex mirrors always produce virtual upright

images that are smaller than the object

Lenses

bull The image formed by a convex lens depends

on the distance of the object from the lens

bull Concave lenses always form virtual upright

images that are smaller than the object

The Eye and Vision

bull The eye contains a lens that changes shape to

produce sharp images on the retina

bull Farsightedness occurs when the eye cannot

form a sharp image of nearby objects

Nearsightedness occurs when the eye cannot

form sharp images of distant objects

6 Calculate Object Distance If you looked through a

convex lens with a focal length of 15 cm and saw a

real inverted enlarged image what is the maximum

distance between the lens and the object

Nearsightedness If you have nearsighted friends you knowthat they can see only nearby objects clearly Their eyes cannotform a sharp image on the retina of an object that is far awayInstead the image is formed in front of the retina as shown inFigure 23 To correct this problem a nearsighted person canwear concave lenses Figure 23 shows how a concave lens causesincoming light rays from distant objects to diverge before theyreach the eye Then the rays can be focused by the eye to form asharp image on the retina

Figure 23 Nearsightedness can

be corrected with concave lenses

Focalpoint

Light fromdistant object

Nearsighted eye

Focalpoint

Light fromdistant object

Correctednearsighted eye

When a nearsighted person looks at distant objects a

sharp image is formed in front of the retina

A concave lens in front of a nearsighted eye makes light

rays diverge so a sharp image is formed on the retina

More Section Review gpesciencecom

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How can you see the back of your head You

can use two mirrors to view a reflection of a

reflection of the back of your head

Real-World ProblemHow many images are seen in two mirrors

Goal Infer how the number of images depends

on the angle between two mirrors

Materialsplane mirrors (2) protractor

masking tape paper clip

Safety Precautions

Handle glass mirrors and paper clips carefully

Procedure1 Complete the safety form

2 Lay one mirror on top of the other with the

mirror surfaces together Tape together one

side so they can open and close Use tape to

label them L and R for left and right

3 Open the mirrors and stand them on a sheet

of paper at an angle of 72deg

4 Bend one leg of a paper clip up 90deg and

place it close to the front of the R mirror

5 Count the number of images of the paper

clip you see in the R and L mirrors Record

these numbers in your data table

6 The mirrors create an image of a circle

divided into wedges Record the number

of wedges

7 Hold the R mirror still and slowly move the Lmirror to 90deg Record the numbers of images

of the clip and wedges in the circle Repeat

this time opening the mirrors to 120deg

Conclude and Apply1 Infer the relationship between the number

of wedges and paper clip images

2 Determine the angle that would divide a

circle into six wedges Hypothesize how

many images would be produced Test your

hypothesis

Reflections of Reflections

Demonstrate for younger students the

relationship between the angle of the

mirrors and the number of reflections

338 CHAPTER 11 Sound and Light

Angle

Number of Number

of Mirrors Paper Clip Images

of Wedges R L

72ordm

90ordm

120ordm

Images and Wedges Seen in the Mirrors

Do not write in this book

SECTION 4 Light and Color 339

Why Objects Have ColorWhy do some apples appear red while others look green or

yellow An objectrsquos color depends on the wavelengths of light itreflects Recall that white light is a blend of all colors of visiblelight When a red apple is struck by white light it reflects redlight back to your eyes and absorbs all of the other colorsFigure 24 shows white light striking a green leaf Only the wave-lengths corresponding to green light are reflected to your eyes

Although some objects appear to be black black isnrsquot acolor Black is the absence of visible light Objects that appearblack absorb all colors of light and reflect little or no light backto your eyes White objects appear to be white because theyreflect all colors of visible light

Why does a white object appear white

Colored Filters Wearing tinted glasses changesthe color of almost everything you see If the lensesare yellow the world takes on a golden glow If theyare rose colored everything looks rosy Somethingsimilar would occur if you placed a colored clearplastic sheet over this white page The paper wouldappear to be the same color as the plastic The plasticsheet and the tinted lenses are filters A filter is atransparent material that transmits one or more col-ors of light but absorbs all others The color of a fil-ter is the color of the light that it transmits

Light and Color

Reading Guide

Explain how you see color Describe the difference between

light color and pigment color Predict what happens when dif-

ferent colors are mixed

From traffic lights to great works of

art color is an important part of your

world

Review Vocabulary

retina inner layer of the eye con-

taining cells that convert light

images into electrical signals

New Vocabulary

bull pigment

Figure 24 This leaf absorbs all

wavelengths of visible light except

the wavelengths you see as green

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340 CHAPTER 11 Sound and Light

Looking Through Colored Filters Figure 25 shows howthe color of an object can change when you look at it throughvarious colored filters The cooler looks blue under white lightbecause it reflects only the wavelengths of blue light that strikeit If you look at the cooler through a blue filter the cooler stilllooks blue because the blue filter transmits the reflected bluelight However if you look at the cooler through a red filter thecooler seems black because the red filter blocks the blue lightreflected by the cooler

Why does a blue object appear black whenviewed through a red filter

Seeing ColorAs you approach a busy intersection the color of the traffic

light changes from green to yellow to red On the cross street thecolor changes from red to green At a busy intersection trafficsafety depends on your ability to detect color changes rapidlyHow do you see colors

Light and the Eye In a healthy eye light enters the eyethrough the cornea is focused by the lens and finally forms animage on the retina The retina is made up of two types of cellsthat absorb light as shown in Figure 26 When these cellsabsorb light energy chemical reactions convert light energy intonerve impulses that are transmitted to the brain One type ofcell in the retina called a cone enables you to distinguish colorsand detailed shapes of objects Cones need bright light to gener-ate nerve impulses so they do not operate in dim light As aresult even brightly colored objects might look gray or black indim light

Figure 25 The color of this

cooler changes when viewed

through different color filters

Topic Color BlindnessVisit for Web

links to information about the

causes of color blindness

Activity Research the causes

and types of color blindness Find

out how cones are related to the

ability to distinguish colors

gpesciencecom

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SECTION 4 Light and Color 341

Cones and Rods Your eyes have three types of cones each ofwhich responds to a different range of wavelengths Red conesrespond to mostly red and yellow light Green cones respond tomostly yellow and green light Blue cones respond to mostlyblue and violet light The second type of cell in the retina calleda rod is sensitive to dim light and enables you to see at nightHowever rod cells do not enable you to see colors

Interpreting Color Why does a bananalook yellow The light reflected by the

banana causes the cone cells that are sensitive to red and greenlight to send signals to your brain Your brain could get the samesignal if a mixture of red light and green light reached your eyesThis mixture also would cause your red and green cones torespond and you would see the color yellow As a result lightwith wavelengths corresponding to yellow light and light that isa mixture of red and green light both cause the color yellow tobe seen What happens when you look at a white shirt You seewhite when all wavelengths of visible light enters your eyes Thenall three sets of cones cells send signals to the brain The com-bination of these signals cause you to see the shirt as white

Color Blindness If one or more of your sets of cone cellsdo not function properly you might not be able to distinguishcertain colors This condition is called color blindness orcolor deficiency About eight percent of men and one-halfpercent of women have some form of color blindness Themost common form of color blindness makes it difficult todistinguish between red and green Figure 27 shows an imagethat is used in a test for redndashgreen color blindness Becausered and green are used in traffic signals drivers and pedestri-ans must be able to identify them

Retina

Rod

Cone

Lens

Figure 27 Color blindness is an

inherited sex-linked condition in

which certain sets of cones in the

retina do not function properly

Identify the number that you seein the dots

Figure 26 Light enters the eye

and focuses on the retina The two

types of light-detecting cells

that make up the retina

are called rods and cones

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342 CHAPTER 11 Sound and Light

Mixing ColorsIf you have ever browsed through a paint store you have

probably seen displays where customers can select paint samplesof almost every imaginable color The colors are a result of mix-tures of pigments For example you might have mixed blue andyellow paint to produce green paint A pigment is a coloredmaterial that is used to change the color of other substancesThe color of a pigment results from the different wavelengths oflight that the pigment reflects

Mixing Colored Lights From the glowing orange of a sun-set to the deep blue of a mountain lake all the colors you see canbe made by mixing three colors of light These three colorsmdashred green and bluemdashare the primary colors of light They cor-respond to the three different types of cones in the retina ofyour eye When mixed together in equal amounts they producewhite light as Figure 28 shows Mixing the primary colors indifferent proportions can produce the colors you see

What are the primary colors of light

Paint Pigments If you were to mix equal amounts of redgreen and blue paint would you get white paint If mixing col-ors of paint were like mixing colors of light you would but mix-ing paint is different Paints are made with pigments Pigmentsproduce color as a result of the wavelengths of light they reflectPaint pigments usually are made of chemical compounds suchas titanium oxide a bright white pigment and lead chromatewhich is used for painting yellow lines on highways

Figure 28 White light is pro-

duced when the three primary col-

ors of light are mixed in equal

amounts

Color for PhotosynthesisPlant pigments determinethe wavelengths oflight for photosynthesisLeaves usually look greenbecause of the pigmentchlorophyll Chlorophyllabsorbs most wave-lengths of visible lightexcept green which itreflects However not allplants are green Researchdifferent plant pigmentsto find out how they allowplant species to survive indiverse habitats

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SECTION 4 Light and Color 343

Self Check

1 Identity what colors are reflected and what colors are

absorbed if a white light shines on a red shirt

2 Discuss how the primary colors of light differ from the

primary pigment colors

3 Explain why a red apple would appear black if you

looked at it through a blue filter

4 Determine why a white fence appears to be white instead

of multicolored if all colors are present in white light

5 Think Critically Light reflected from an object passes

through a green filter then a red filter and finally a

blue filter What color will the object seem to be

Summary

Why Objects Have Color

bull The color of an object is determined by the

wavelengths of light it reflects

bull The color of a filter is the color of the light the

filter transmits

Seeing Color

bull Rod and cone cells are light-sensitive cells

found in the retina of the human eye

bull Rod cells are sensitive to dim light Cone cells

enable colors to be seen

bull There are three types of cone cells One type

responds to red light another to green light

and another to blue light

Mixing Colors

bull Red green and blue are the primary light

colors Any color of light can be created by

mixing these primary light colors

bull Any pigment color can be formed by mixing

the primary pigment colorsmdashmagenta cyan

and yellow

6 Use Percentages In the human eye there are about

120000000 rods If 90000000 rods trigger at once

what percentage of the total number of rods triggered

7 Convert Units The wavelengths of light are measured

in nanometers (nm) which equals 0000001 mm

Find the wavelength in mm of a light wave that has a

wavelength of 690 nm

Mixing Pigments You can make any pigment color by mixingdifferent amounts of the three primary pigmentsmdashmagenta(bluish red) cyan (greenish blue) and yellow In fact color print-ers use these pigments as well as black ink to make full-colorprints like the pages in this book A primary pigmentrsquos colordepends on the wavelengths of the light that it reflects Actuallypigments both absorb and reflect a range of colors in sending asingle color message to your eye For example in white lightyellow pigment appears yellow because it reflects red and greenlight but absorbs the other wavelengths of visible light The colorof a mixture of two primary pigments is determined by theprimary colors of light that both pigments reflect

Look at Figure 29 The area in the center where the colors alloverlap appears to be black because the three blended primarypigments absorb all the primary colors of light Recall that theprimary colors of light combine to produce white light They arecalled additive colors However when the primary pigment col-ors are combined they absorb all wavelengths of visible light andproduce black Because black results from the absence ofreflected light the primary pigments are called subtractive colors

Figure 29 The three primary

pigment colors appear to be black

when they are mixed

Describe how the primary pigmentcolors are similar to the primary col-ors of light

More Section Review gpesciencecom

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Design Your OwnDesign Your Own

344

Real-World ProblemWhat loud noises do you enjoy and which ones do you find annoying

Most people enjoy a music concert performed by their favorite artist or

the booming displays of fireworks on the Fourth of July Most people

enjoy these loud sounds for short periods of time However certain

other loud noises such as traffic sirens and loud talking can be

annoying Constant annoying noises are called noise pollution What

can be done to reduce noise pollution What types of barriers will best

block out noise pollution

Form a HypothesisBased on your experiences with loud noises form a hypothesis that

predicts the effectiveness of different types of barriers at blocking out

noise pollution

Test Your HypothesisMake a Plan

1 Complete the safety form

2 Decide what type of barriers or materials you will test

3 Describe exactly how you will use these materials

Goals Design an experiment

that tests the effective-

ness of various types of

barriers and materials

for blocking out noise

pollution

Test different types of

materials and barriers

to determine the best

noise blocks

Possible Materialsradio CD player horn

drum or other loud

noise source

shrubs trees concrete

walls brick walls stone

walls wooden fences

parked cars or hanging

laundry

sound meter

meterstick or metric tape

measure

Blocking NfisePollution

4 Identify the controls and variables you will use in your

experiment

5 List the steps you will use and describe each step precisely

6 Prepare a data table in your Science Journal to record your

measurements

7 Organize the steps of your experiment in logical order

Follow Your Plan

1 Ask your teacher to approve your plan and data table before

you start

2 Conduct your experiment as planned

3 Test each barrier two or three times

4 Record the results from each test in your data table in your Science Journal

Analyze Your Data1 Identify the barriers that most effectively reduced noise pollution

2 Identify the barriers that least effectively reduced noise pollution

3 Compare the effective barriers and identify common characteristics that might

explain why they reduced noise pollution

4 Compare the natural barriers you tested with the artificial barriers Which type

of barrier best reduced noise pollution

5 Compare the different types of materials the barriers were made of Which

type of material best reduced noise pollution

Conclude and Apply1 Evaluate whether your results support your hypothesis

2 Predict how your results would differ if you used a louder source of noise such

as a siren

3 Infer from your results how people living near a

busy street could reduce noise pollution

4 Identify major sources of noise pollution in or

near your home How could they be reduced

5 Research how noise pollution can be

unhealthy

LAB 345

Draw a poster illustrating how builders and

landscapers could use certain materials to

better insulate a home or office from excess

noise pollution

346 CHAPTER 11 Sound and Light

A Haiku GardenThe Four Seasons in Poems and Prints

by Stephen Addiss with Fumiko and Akira Yamamoto

Respond to the Reading1 How do the illustrations help the reader

better understand the poems2 What do you think is meant by the

word lingering in the Haiku about springsunlight

3 Linking Science and Writing Writeone haiku about summer and anotherabout fall In one poem use color tohelp you describe the season In theother use light or some property oflight to help describe the season

Research has deter-mined that there is a

connection between color and mood Warmcolors have longer wavelengths and can bemore stimulating Cool colors which haveshorter wavelengths tend to have a calmingor soothing effect on people Light and colorhave long been used as literary symbols Doesthe use of color change what you imaginewhen you read the haiku

UnderstandingLiteratureJapanese Haiku A haiku is a verse thatconsists of three lines and 17 syllables inthe Japanese language The first and thirdlines have five syllables each and themiddle line has seven syllables Why isimagination important in reading haiku

Lingering

in every pool of watermdash

spring sunlightIssa

Withered by winter

the sound of the windmdash

one-color worldBasho

Sound

1 Sound waves are compressional waves thattravel only in matter

2 The speed of sound in a material dependson the type of material as well as itstemperature

3 Loudness depends on a sound waversquos inten-sity Pitch depends on a sound waversquosfrequency

4 Sound waves are used in echolocationsonar and medical imaging

Reflection and Refractionof Light

1 Light can be absorbed reflected or trans-mitted by a material

2 When light waves are reflected theyobey the law of reflectionmdashthe angle ofincidence equals the angle of reflection

3 A light wave is refracted or bent whenit changes speed as it travels at an anglefrom one material to another

Mirrors Lenses andthe Eye

1 Plane mirrors form upright virtual images

2 Images formed by concave mirrors andconvex lenses depend on the location ofthe object relative to the focal point

3 Convex mirrors and concave lenses formvirtual upright images that are smallerthan the object

4 The lens in the human eye changes shape toproduce a sharp image on the retina

Light and Color

1 You see color when light is reflected offobjects and into your eyes

2 Cone cells in the retina are light-sensitivecells that enable you to distinguish colors

3 Red blue and green are the three primarycolors of light and can be mixed to form allother colors

4 The primary pigment colors are magentacyan and yellow

CHAPTER STUDY GUIDE 347

Use the Foldable you made at the beginningof the chapter to help you review sound and light

Interactive Tutor gpesciencecom

Complete each statement with the correctvocabulary word or phrase

1 A change in frequency due to a movingsound source is due to the

2 A flat smooth surface that reflects light andforms an image is a(n)

3 An object is if you can seethrough it clearly

4 The of a material indicates howmuch the speed of light in the materialchanges as light passes through

5 You can change the color of white paint byadding a(n) to it

6 A(n) is a reflecting surface thatcurves outward like the back of a spoon

7 The human perception of the intensity of asound wave is

Choose the word or phrase that best answerseach question

8 Which of the following best describes imageformation by a plane mirrorA) A real image is formed in front of the mirrorB) A real image is formed behind the mirrorC) A virtual image is formed in front of the

mirrorD) A virtual image is formed behind the mirror

9 For a sound with low pitch what else isalso always lowA) amplitude C) wavelengthB) frequency D) wave velocity

10 Which of the following occurs when asound source moves away from youA) The soundrsquos velocity decreasesB) The soundrsquos loudness increasesC) The soundrsquos frequency decreasesD) The soundrsquos frequency increases

Use the table below to answer question 11

11 Based on the data in the table abovewhich of the following would be the speedof sound in air at 30degCA) 3404 ms C) 3494 msB) 3464 ms D) 3534 ms

12 What happens to a light ray travelingparallel to the optical axis of a convexlens that passes through the lensA) It travels parallel to the optical axisB) It passes through the focal pointC) It is bent away from the optical axisD) It forms a virtual image

13 Light waves of which color are bent mostwhen passing through a prismA) blue C) violetB) red D) yellow

14 Which way does a concave lens bend lightA) toward its optical axisB) toward its centerC) toward its edgesD) toward its focal point

Speed of Sound in Air

Temp peed( s)

4

4

4

348 CHAPTER REVIEW

concave lens p 335concave mirror p 332convex lens p 333convex mirror p 333decibel p 322Doppler effect p 323index of refraction p 329intensity p 322

loudness p 322opaque p 327pigment p 342pitch p 323plane mirror p 331translucent p 327transparent p 327

Vocabulary PuzzleMaker gpesciencecom

Use the illustration below to answer question 15

15 Describe how the position of the candlechanged if the image of the candle movedaway from the focal point

16 Apply Acoustic scientists sometimes doresearch in rooms that absorb all soundwaves How could such a room be used tostudy how bats find their food

17 Compare White light passes through atranslucent pane of glass and shines on ashirt Both the translucent glass and theshirt appear green Compare the colors oflight that are absorbed and transmitted bythe glass and the shirt

18 Infer Most mammals including dogs andcats canrsquot see colors Infer how the retinaof a catrsquos eye might be different from theretina of a human eye

19 Determine whether a convex lens could forman image that is enlarged real and upright

20 Infer A car comes to a railroad crossingThe driver hears a trainrsquos whistle and itspitch becomes lower What can beassumed about how the train is moving

21 Compare and contrast the reflection of lightfrom a white wall with a rough surfacewith the reflection of light from a mirror

Optical axis

One

focal

length

Two

focal

lengths

Image

Ray A

Object

Focal

point

Interpreting Graphics 22 Infer why a convex mirror and a concavelens can never produce a real image

23 Predict what color a white shirt wouldappear to be if the light reflected from theshirt passed through a red filter and thenthrough a green filter

24 Explain why windows might begin to rattlewhen an airplane flies overhead

25 Communicate Some people enjoy usingsnowmobiles Others object to the noisethat they make Write a proposal for a pol-icy that seems fair to both groups for theuse of snowmobiles in a state park

CHAPTER REVIEW 349

Use the wave speed equation ν ƒλ to answer

questions 26 and 27

26 Calculate Frequency A sonar pulse has awavelength of 30 cm and a speed inwater of 1500 ms Find its frequency

27 Calculate Wavelength What is the wave-length of a sound wave with a fre-quency of 440 Hz if the speed of soundin air is 340 ms

28 Calculate Angle of Incidence A light ray isreflected from a mirror If the anglebetween the incident ray and thereflected ray is 136deg what is the angleof incidence

29 Determine Object Distance You hold anobject in front of a concave mirror witha focal length of 30 cm If you do notsee a reflected image how far from themirror is the object

30 Calculate Speed The speed of light in avacuum is 300000 kms If the index ofrefraction of water is 133 what is thespeed of light in water

More Chapter Review gpesciencecom

1 Which of the following describes the imageformed by a convex mirror

A enlarged

B inverted

C real

D virtual

Use the figure below to answer question 2

2 Which of the following describes a light raythat passes through the focal point andthen is reflected by the mirror

A It travels parallel to the optical axis

B It forms a real image

C It is reflected back through the focal point

D It forms a virtual image

3 Why does an apple look red

A It reflects red light

B It absorbs red light

C It reflects green and blue light

D It reflects all colors of light except red

Use the figure below to answer questions 4 and 5

4 When the primary colors of light are addedtogether what color appears in area H

A cyan

B magenta

C white

D yellow

5 When the primary colors of light are addedtogether what color appears in area G

A cyan

B magenta

C white

D yellow

6 Which of the following increases as the fre-quency of a sound increases

A amplitude

B intensity

C loudness

D pitch

Red Blue

Green

F

H

G K

Focal pointOptical axis

350 STANDARDIZED TEST PRACTICE

Record your answers on the answer sheet provided by your teacher or on a sheet of paper

STANDARDIZED TEST PRACTICE 351

7 Which of the following parts of the eyeenable you to see colors in bright light

A cone cells

B cornea

C lens

D rod cells

Use the graph below to answer questions 8 and 9

8 Determine how far in centimeters theimage is from the lens when the object is15 centimeters from the lens

9 How far in centimeters is the object fromthe lens when the image distance andobject distance are equal

10 A shirt has stripes that are black and whitein white light If green light shines on thisshirt what colors will the black and whitestripes be

11 If you are on a moving train what hap-pens to the pitch of a crossing bell as youapproach the crossing and then moveaway from the crossing

Use the figure below to answer question 12

12 Describe the vision problem show by thefigure and explain how this vision prob-lem can be corrected

13 Explain why the human eye can see colorsbetter in bright light than in dim light

Image Distance fora Convex Lens

Ima

ge

dis

tan

ce (

cm)

30

25

20

15

10

5 10 15 20 25 30

Object distance (cm)

Standardized Test Practice gpesciencecom

Note Units Read carefully and make note of the units used in

any measurement

  • Glencoe Physical Science with Earth Science
    • Student Edition Table of Contents
      • Unit 1 Science and Technology
        • Chapter 1 The Nature of Science
          • Launch Lab Understanding Measurements
          • Foldables
          • Section 1 The Methods of Science
            • Science Online
            • Integrate History
            • Integrate Earth Science
            • Science Online
              • Section 2 Standards of Measurement
                • Applying Math Centimeters
                • Integrate Earth Science
                • Science Online
                • MiniLAB Determining the Density of a Pencil
                • Visualizing SI Dimensions
                  • Section 3 Communicating with Graphs
                    • Applying Math Temperature
                    • MiniLAB Graphing Temperature Change
                    • Lab Whats my graph
                    • Lab Design Your Own - Developing a Measurement System
                    • Science and Language Arts Thinking in Pictures and Other Reports from My Life with Autism
                      • Chapter 1 Study Guide
                      • Chapter 1 Review
                      • Chapter 1 Standardized Test Practice
                        • Chapter 2 Science Technology and Society
                          • Lab Technology in Your Life
                          • Foldables
                          • Section 1 Science and Technology
                            • MiniLAB Researching the Past
                            • Visualizing Technology Supplying Basic Needs
                            • Science Online
                              • Section 2 Forces that Shape Technology
                                • MiniLAB Evaluating the Benefits and Consequences of Technology
                                • Integrate Environment
                                • Integrate History
                                • Applying Science What impact does the accident at Chernobyl have on the future of nuclear power
                                • Science Online
                                • Lab Who contributes CO2
                                  • Section 3 Developing Technology
                                    • Integrate Life Science
                                    • Integrate Career
                                    • Lab Model and Invent - Care Package
                                    • Oops Accidents in Science A Slippery Situation
                                      • Chapter 2 Study Guide
                                      • Chapter 2 Review
                                      • Chapter 2 Standardized Test Practice
                                          • Unit 2 Motion Forces and Energy
                                            • Chapter 3 Motion Acceleration and Forces
                                              • Launch Lab Compare Speeds
                                              • Foldables
                                              • Section 1 Describing Motion
                                                • MiniLAB Measuring Average Speed
                                                • Science Online
                                                • Applying Math Average Speed
                                                • Integrate Astronomy
                                                • Science Online
                                                  • Section 2 Acceleration
                                                    • Integrate History
                                                    • Visualizing Acceleration
                                                      • Section 3 Motion and Forces
                                                        • Science Online
                                                        • MiniLAB Comparing Friction
                                                        • Lab Force and Acceleration
                                                        • Lab Design Your Own - Comparing Motion from Different Forces
                                                        • Science and Language Arts A Brave and Startling Truth
                                                          • Chapter 3 Study Guide
                                                          • Chapter 3 Review
                                                          • Chapter 3 Standardized Test Practice
                                                            • Chapter 4 The Laws of Motion
                                                              • Launch Lab The Force of Gravity
                                                              • Foldables
                                                              • Section 1 The First Two Laws of Motion
                                                                • MiniLAB Observing Inertia
                                                                • Science Online
                                                                • Applying Math The Acceleration of a Sled Solve a Simple Equation
                                                                  • Section 2 Gravity
                                                                    • Science Online
                                                                    • Integrate Earth Science
                                                                    • MiniLAB Observing Centripetal Force
                                                                    • Lab Gravity and Air Resistance
                                                                      • Section 3 The Third Law of Motion
                                                                        • Integrate Career
                                                                        • Visualizing Rocket Motion
                                                                        • Applying Math The Momentum of a Sprinter
                                                                        • Lab The Momentum of Colliding Objects
                                                                        • Science and History Newton and the Plague
                                                                          • Chapter 4 Study Guide
                                                                          • Chapter 4 Review
                                                                          • Chapter 4 Standardized Test Practice
                                                                            • Chapter 5 Energy
                                                                              • Launch Lab Energy Conversions
                                                                              • Foldables
                                                                              • Section 1 The Nature of Energy
                                                                                • Science Online
                                                                                • Applying Math Kinetic Energy
                                                                                • MiniLAB Interpreting Data from a Slingshot
                                                                                • Integrate Language Arts
                                                                                • Applying Math Gravitational Potential Energy
                                                                                • Lab Bouncing Balls
                                                                                  • Section 2 Conservation of Energy
                                                                                    • Visualizing Energy Transformations
                                                                                    • Integrate Environment
                                                                                    • MiniLAB Transforming Energy in a Paper Clip
                                                                                    • Science Online
                                                                                    • Integrate Health
                                                                                    • Lab Design Your Own - Swinging Energy
                                                                                    • Science and History The Impossible Dream
                                                                                      • Chapter 5 Study Guide
                                                                                      • Chapter 5 Review
                                                                                      • Chapter 5 Standardized Test Practice
                                                                                        • Chapter 6 Work and Machines
                                                                                          • Launch Lab Doing Work with a Simple Machine
                                                                                          • Foldables
                                                                                          • Section 1 Work
                                                                                            • Integrate Language Arts
                                                                                            • Applying Math Work
                                                                                            • MiniLAB Calculating Your Work and Power
                                                                                            • Applying Math Power
                                                                                              • Section 2 Using Machines
                                                                                                • MiniLAB Machines Multiplying Force
                                                                                                • Science Online
                                                                                                • Integrate Chemistry
                                                                                                  • Section 3 Simple Machines
                                                                                                    • Integrate History
                                                                                                    • Visualizing Levers in the Human Body
                                                                                                    • Science Online
                                                                                                    • Lab Levers
                                                                                                    • Lab Model and Invent - Using Simple Machines
                                                                                                    • Science and Society The Science of Very Very Small
                                                                                                      • Chapter 6 Study Guide
                                                                                                      • Chapter 6 Review
                                                                                                      • Chapter 6 Standardized Test Practice
                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                          • Launch Lab Relative Sizes of Earth the Moon and the Sun
                                                                                                          • Foldables
                                                                                                          • Section 1 Earth in Space
                                                                                                            • Science Online
                                                                                                            • Integrate Physics
                                                                                                              • Section 2 Time and Seasons
                                                                                                                • MiniLAB Modeling the Suns Rays at Solstice
                                                                                                                • Lab Comparing the Angle of Sunlight to Intensity
                                                                                                                  • Section 3 Earths Moon
                                                                                                                    • Applying Math Tides
                                                                                                                    • MiniLAB Modeling Phases and Eclipses
                                                                                                                    • Integrate History
                                                                                                                    • Integrate History
                                                                                                                    • Science Online
                                                                                                                    • Visualizing Water on the Moon
                                                                                                                    • Lab Identifying the Moons Surface Features and Apollo Landing Sites
                                                                                                                    • Oops Accidents in Science Even Great Scientists Make Mistakes
                                                                                                                      • Chapter 7 Study Guide
                                                                                                                      • Chapter 7 Review
                                                                                                                      • Chapter 7 Standardized Test Practice
                                                                                                                        • Chapter 8 The Solar System
                                                                                                                          • Launch Lab The Size of the Solar System
                                                                                                                          • Foldables
                                                                                                                          • Section 1 Planet Motion
                                                                                                                            • Integrate History
                                                                                                                            • MiniLAB Plotting Retrograde Motion
                                                                                                                            • Integrate Physics
                                                                                                                            • Applying Math Heliocentric Longitude (HL)
                                                                                                                              • Section 2 The Inner Planets
                                                                                                                                • Science Online
                                                                                                                                • Integrate Chemistry
                                                                                                                                • Lab Interpreting Features of Marss Surface
                                                                                                                                  • Section 3 The Outer Planets
                                                                                                                                    • Integrate Language Arts
                                                                                                                                    • Visualizing What Galileo Saw
                                                                                                                                    • Science Online
                                                                                                                                    • MiniLAB Comparing Sizes of Outer and Inner Planets
                                                                                                                                      • Section 4 Life in the Solar System
                                                                                                                                        • Lab Design Your Own - Testing Unknown Soil Samples for Life
                                                                                                                                        • Science Stats Night Sky Wonders
                                                                                                                                          • Chapter 8 Study Guide
                                                                                                                                          • Chapter 8 Review
                                                                                                                                          • Chapter 8 Standardized Test Practice
                                                                                                                                              • Unit 3 Energy in Motion
                                                                                                                                                • Chapter 9 Heat and States of Matter
                                                                                                                                                  • Launch Lab Expansion of a Gas
                                                                                                                                                  • Foldables
                                                                                                                                                  • Section 1 Temperature and Thermal Energy
                                                                                                                                                    • Applying Math Converting to Celsius
                                                                                                                                                    • Science Online
                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                    • Applying Math Change in Thermal Energy
                                                                                                                                                      • Section 2 States of Matter
                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                        • Science Online
                                                                                                                                                        • MiniLAB Comparing States of Water
                                                                                                                                                          • Section 3 Transferring Thermal Energy
                                                                                                                                                            • MiniLAB Comparing Thermal Conductors
                                                                                                                                                            • Visualizing Convection Currents
                                                                                                                                                            • Lab Convection in Gases and Liquids
                                                                                                                                                              • Section 4 Using Thermal Energy
                                                                                                                                                                • Integrate History
                                                                                                                                                                • Science Online
                                                                                                                                                                • Lab Conduction in Gases
                                                                                                                                                                • Science Stats Surprising Thermal Energy
                                                                                                                                                                  • Chapter 9 Study Guide
                                                                                                                                                                  • Chapter 9 Review
                                                                                                                                                                  • Chapter 9 Standardized Test Practice
                                                                                                                                                                    • Chapter 10 Waves
                                                                                                                                                                      • Launch Lab How do waves transfer energy
                                                                                                                                                                      • Foldables
                                                                                                                                                                      • Section 1 The Nature of Waves
                                                                                                                                                                        • Visualizing Formation of Ocean Waves
                                                                                                                                                                        • Science Online
                                                                                                                                                                          • Section 2 Wave Properties
                                                                                                                                                                            • MiniLAB Observing Wavelength
                                                                                                                                                                            • Integrate Social Studies
                                                                                                                                                                            • Applying Math The Speed of Sound
                                                                                                                                                                            • Lab Wave Speed and Tension
                                                                                                                                                                              • Section 3 The Behavior of Waves
                                                                                                                                                                                • Science Online
                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                • MiniLAB Experimenting with Resonance
                                                                                                                                                                                • Lab Measuring Wave Properties
                                                                                                                                                                                • Science and History Making Waves
                                                                                                                                                                                  • Chapter 10 Study Guide
                                                                                                                                                                                  • Chapter 10 Review
                                                                                                                                                                                  • Chapter 10 Standardized Test Practice
                                                                                                                                                                                    • Chapter 11 Sound and Light
                                                                                                                                                                                      • Launch Lab What sound does a ruler make
                                                                                                                                                                                      • Foldables
                                                                                                                                                                                      • Section 1 Sound
                                                                                                                                                                                        • MiniLAB Comparing Intensity
                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                        • Science Online
                                                                                                                                                                                        • Applying Math Using Sonar
                                                                                                                                                                                          • Section 2 Reflection and Refraction of Light
                                                                                                                                                                                          • Section 3 Mirrors Lenses and the Eye
                                                                                                                                                                                            • Visualizing Images Formed by a Convex Lens
                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                            • MiniLAB Experimenting with Focal Lengths
                                                                                                                                                                                            • Lab Reflections of Reflections
                                                                                                                                                                                              • Section 4 Light and Color
                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Lab Design Your Own - Blocking Noise Pollution
                                                                                                                                                                                                • Science and Language Arts A Haiku Garden The Four Seasons in Poems and Print
                                                                                                                                                                                                  • Chapter 11 Study Guide
                                                                                                                                                                                                  • Chapter 11 Review
                                                                                                                                                                                                  • Chapter 11 Standardized Test Practice
                                                                                                                                                                                                    • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                      • Launch Lab Global Jigsaw Puzzle
                                                                                                                                                                                                      • Foldables
                                                                                                                                                                                                      • Section 1 Evolution of Earths Crust
                                                                                                                                                                                                        • Applying Math Spreading Distances
                                                                                                                                                                                                        • Integrate Physics
                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                          • Section 2 Earthquakes
                                                                                                                                                                                                            • MiniLAB Demonstrating Four Types of Stress
                                                                                                                                                                                                            • Visualizing Earthquake-Proof Buildings
                                                                                                                                                                                                              • Section 3 Earths Interior
                                                                                                                                                                                                              • Section 4 Volcanoes
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • MiniLAB Modeling Lava Viscosity
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                • Lab A Case for Pacific Plate Motion
                                                                                                                                                                                                                • Lab Earthquake Earthquake Wheres the earthquake
                                                                                                                                                                                                                • Science and History Volcano Weather
                                                                                                                                                                                                                  • Chapter 12 Study Guide
                                                                                                                                                                                                                  • Chapter 12 Review
                                                                                                                                                                                                                  • Chapter 12 Standardized Test Practice
                                                                                                                                                                                                                      • Unit 4 Forms of Energy
                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                          • Launch Lab Electric Circuits
                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                          • Section 1 Electric Charge
                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                            • Visualizing Lightning
                                                                                                                                                                                                                            • MiniLAB Investigate Charged Objects
                                                                                                                                                                                                                              • Section 2 Electric Current
                                                                                                                                                                                                                                • MiniLAB Investigating Battery Addition
                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                • Lab Identifying Conductors and Insulators
                                                                                                                                                                                                                                  • Section 3 Electrical Energy
                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                    • Applying Math Power Used by a Clothes Dryer
                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                    • Applying Math Electrical Energy Used by a Microwave Oven
                                                                                                                                                                                                                                    • Lab Design Your Own - Comparing Series and Parallel Circuits
                                                                                                                                                                                                                                    • Science and Language Arts Invisible Man
                                                                                                                                                                                                                                      • Chapter 13 Study Guide
                                                                                                                                                                                                                                      • Chapter 13 Review
                                                                                                                                                                                                                                      • Chapter 13 Standardized Test Practice
                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                          • Launch Lab The Strength of Magnets
                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                          • Section 1 Magnetism
                                                                                                                                                                                                                                            • MiniLAB Observing Magnetic Interference
                                                                                                                                                                                                                                            • Integrate Earth Science
                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                            • Applying Science How can magnetic parts of a junk car be salvaged
                                                                                                                                                                                                                                            • MiniLAB Making Your Own Compass
                                                                                                                                                                                                                                              • Section 2 Electricity and Magnetism
                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                  • Section 3 Producing Electric Current
                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                    • Visualizing Motors and Generators
                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                    • Lab Electricity and Magnetism
                                                                                                                                                                                                                                                    • Lab Design Your Own - Controlling Electromagnets
                                                                                                                                                                                                                                                    • Science and History Body Art
                                                                                                                                                                                                                                                      • Chapter 14 Study Guide
                                                                                                                                                                                                                                                      • Chapter 14 Review
                                                                                                                                                                                                                                                      • Chapter 14 Standardized Test Practice
                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                          • Launch Lab Can electromagnetic waves change materials
                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                          • Section 1 What are electromagnetic waves
                                                                                                                                                                                                                                                            • MiniLAB Investigating Electromagnetic Waves
                                                                                                                                                                                                                                                            • Applying Math The Speed of Light in Water
                                                                                                                                                                                                                                                              • Section 2 The Electromagnetic Spectrum
                                                                                                                                                                                                                                                                • MiniLAB Heating with Microwaves
                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                • Lab The Shape of Satellite Dishes
                                                                                                                                                                                                                                                                  • Section 3 Radio Communication
                                                                                                                                                                                                                                                                    • Visualizing Radio Broadcasts
                                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Lab Use the Internet - Radio Frequencies
                                                                                                                                                                                                                                                                    • Science and History Riding a Beam of Light
                                                                                                                                                                                                                                                                      • Chapter 15 Study Guide
                                                                                                                                                                                                                                                                      • Chapter 15 Review
                                                                                                                                                                                                                                                                      • Chapter 15 Standardized Test Practice
                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                          • Launch Lab Heating with Solar Energy
                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                          • Section 1 Fossil Fuels
                                                                                                                                                                                                                                                                            • Visualizing The Formation of Fossil Fuels
                                                                                                                                                                                                                                                                            • MiniLAB Designing an Efficient Water Heater
                                                                                                                                                                                                                                                                              • Section 2 Nuclear Energy
                                                                                                                                                                                                                                                                                • Integrate Earth Science
                                                                                                                                                                                                                                                                                • Integrate Social Science
                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                • Applying Science Can a contaminated radioactive site be reclaimed
                                                                                                                                                                                                                                                                                  • Section 3 Renewable Energy Sources
                                                                                                                                                                                                                                                                                    • MiniLAB Using Solar Power at Home
                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                    • Lab Solar Heating
                                                                                                                                                                                                                                                                                    • Lab Use the Internet How much does energy really cost
                                                                                                                                                                                                                                                                                    • Science and Society Reacting to Nuclear Energy
                                                                                                                                                                                                                                                                                      • Chapter 16 Study Guide
                                                                                                                                                                                                                                                                                      • Chapter 16 Review
                                                                                                                                                                                                                                                                                      • Chapter 16 Standardized Test Practice
                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                          • Lab Atmospheric Pressure
                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                          • Section 1 Earths Atmosphere
                                                                                                                                                                                                                                                                                            • MiniLAB Visualizing Convection
                                                                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                                                                            • Lab Visualizing a Temperature Inversion
                                                                                                                                                                                                                                                                                              • Section 2 Weather
                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Coriolis Effect
                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                  • Section 3 Climate
                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                    • Visualizing Earths Biogeophysical System
                                                                                                                                                                                                                                                                                                      • Section 4 Earths Changing Climates
                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                        • Applying Math Carbon Dioxide (CO2) Concentration
                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Investigating Microclimate
                                                                                                                                                                                                                                                                                                        • Science and Language Arts The Grapes of Wrath
                                                                                                                                                                                                                                                                                                          • Chapter 17 Study Guide
                                                                                                                                                                                                                                                                                                          • Chapter 17 Review
                                                                                                                                                                                                                                                                                                          • Chapter 17 Standardized Test Practice
                                                                                                                                                                                                                                                                                                              • Unit 5 Matter and Earth Materials
                                                                                                                                                                                                                                                                                                                • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                  • Launch Lab Demonstrate the Distillation of Water
                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                  • Section 1 Composition of Matter
                                                                                                                                                                                                                                                                                                                    • Visualizing Elements
                                                                                                                                                                                                                                                                                                                    • MiniLAB Classifying Materials
                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                    • Lab Comparing Pure Substances and Mixtures
                                                                                                                                                                                                                                                                                                                      • Section 2 Properties of Matter
                                                                                                                                                                                                                                                                                                                        • Integrate Environment
                                                                                                                                                                                                                                                                                                                        • MiniLAB Separating Ink
                                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                                        • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                        • Applying Math The Law of Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Measuring the Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Science Stats Intriguing Elements
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Study Guide
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Review
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                            • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                              • Launch Lab Inferring What You Cant Observe
                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                              • Section 1 Structure of the Atom
                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling an Aluminum Atom
                                                                                                                                                                                                                                                                                                                                • Visualizing The Atomic Model
                                                                                                                                                                                                                                                                                                                                  • Section 2 Masses of Atoms
                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                    • Applying Science How can radioactive isotopes help tell time
                                                                                                                                                                                                                                                                                                                                      • Section 3 The Periodic Table
                                                                                                                                                                                                                                                                                                                                        • MiniLAB Organizing a Personal Periodic Table
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Career
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                                                                                                                                                                        • Lab A Periodic Table of Foods
                                                                                                                                                                                                                                                                                                                                        • Lab Use the Internet Whats in a name
                                                                                                                                                                                                                                                                                                                                        • Science and History A Chilling Story
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Study Guide
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Review
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                            • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                              • Launch Lab Earth Materials at Home and School
                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                              • Section 1 Minerals
                                                                                                                                                                                                                                                                                                                                                • MiniLAB Identifying Salts Crystal System
                                                                                                                                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                • Lab Be a Mineral Detective
                                                                                                                                                                                                                                                                                                                                                  • Section 2 Igneous Rocks
                                                                                                                                                                                                                                                                                                                                                    • Applying Math Extrusive Igneous Rock Classification
                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                      • Section 3 Sedimentary Rocks
                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Evaporites
                                                                                                                                                                                                                                                                                                                                                          • Section 4 Metamorphic Rocks and the Rock Cycle
                                                                                                                                                                                                                                                                                                                                                            • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                            • Visualizing Shock Metamorphic Rock
                                                                                                                                                                                                                                                                                                                                                            • Lab Identifying Rocks
                                                                                                                                                                                                                                                                                                                                                            • Science and Society Earth Materials at Work
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Study Guide
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Review
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                  • Launch Lab Have you got the time
                                                                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                                                                  • Section 1 Weathering and Soil
                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing a Disappearing Seasoning
                                                                                                                                                                                                                                                                                                                                                                    • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                    • Lab Graphing Soil Textures
                                                                                                                                                                                                                                                                                                                                                                      • Section 2 Shaping the Landscape
                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Runoff
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                          • Section 3 Groundwater
                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Porosity Volume
                                                                                                                                                                                                                                                                                                                                                                            • Visualizing The Role of Groundwater in Shaping Earths Surface
                                                                                                                                                                                                                                                                                                                                                                            • Integrate Environment
                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                              • Section 4 Geologic Time
                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                                                                                                • Lab Its about time - relative that is
                                                                                                                                                                                                                                                                                                                                                                                • Science and Society Tapping into the Underground
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Review
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                      • Unit 6 Interactions of Matter
                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                          • Lab Chemical Bonds and Mixing
                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Stability in Bonding
                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                            • Lab Atomic Trading Cards
                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Types of Bonds
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Observing a Bond Type
                                                                                                                                                                                                                                                                                                                                                                                                • Visualizing Polar Molecules
                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Writing Formulas and Naming Compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math Determining a Formula
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Science Can you name binary ionic compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Making a Hydrate
                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Model and Invent - Modeling Chemical Bonding
                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Sticky Subject
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Review
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab RustingmdashA Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Chemical Changes
                                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Designing a Team Equation
                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Chemical Equations
                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math Barium Sulfate Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Classifying Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 4 Reaction Rates and Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing Chemical Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Creating a Colorful Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab To Glow or Not to Glow
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Investigating Reaction Conditions
                                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Clumsy Move Pays Off
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Review
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab Magic Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 How Solutions Form
                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                                                                                                                                                                                                                                                            • Visualizing Metal Alloys
                                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Observing the Effect of Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Solubility and Concentration
                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Acids Bases and Salts
                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing Acid Relief
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Strength of Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Determining Acidity
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Saturated Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and Society Acid Rain
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab The Size of a Nucleus
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Strong Force
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Nuclear Decay
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Detecting Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math The Age of Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Social Studies
                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Nuclear Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling a Nuclear Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Visualizing PET Scans
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Chain Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Model and Invent Modeling Transmutations
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and History The Nuclear Alchemist
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Study Guide
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                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 26 Stars and Galaxies
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab Stars in the Sky
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Observing the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling a Telescope
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math The Magnifying Power of Telescopes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Evolution of Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Counting Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing H-R Diagrams of Star Clusters
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Star Cluster Age
                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 3 Galaxies and the Milky Way
                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 4 Cosmology
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Language Arts
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Science and Language Arts Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Standardized Test Practice
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 8 The Solar System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 9 Heat and States of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 10 Waves
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 11 Sound and Light
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 13 Electricity
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Page 2: 706 S1 318-326 GPS09 - Light-and-Sound - home · PDF fileWhat sound does a ruler make? ... sound waves cannot travel in empty space where there are no particles. ... sound travels

319319

Sound and Light Make the

following Foldable to help you

identify ways in which sound

and light are different and alike

Fold one sheet of paper lengthwise

Fold into thirds

Unfold and draw overlapping ovals

Cut the top sheet along the folds

Label the ovals as shown

Constructing a Venn Diagram As you read the

chapter list the characteristics unique to sound

under the left tab the characteristics unique to

light under the right tab and those common to

both under the middle tab

STEP 4

STEP 3

STEP 2

STEP 1

What sound does a ruler make

Musical instruments come in many shapes

and sizes Some have strings some have hol-

low tubes and others have keys or pedals

They are played with various techniques

These differences give each instrument a

unique sound What would an instrument

made from a ruler sound like

1 Complete the safety form

2 Firmly hold one end of a thin ruler lying

flat on a desk allowing the free end to

extend beyond the edge of the desk

3 Gently pull up on and release the end of

the ruler What do you see and hear

4 Vary the length of the overhanging por-

tion and repeat the experiment several

times

5 Think Critically In your Science Journal

write instructions for playing a song with

the ruler Explain how the length of the

overhanging part of the ruler affects the

sound

Start-Up Activities

Preview this chapterrsquos contentand activities at gpesciencecom

Sound LightBoth

AFPCORBIS

320 CHAPTER 11 Sound and Light

Sound WavesAn amusement park can be a noisy place With all the racket

of carousel music and booming loudspeakers it can be hard tohear what your friends say The many sounds you hear every dayare different but they do have something in commonmdasheachsound is produced by an object that vibrates

Making Sound Waves When an object like the tuning forkin Figure 1 vibrates it creates sound waves Sound waves arecompressional waves Recall that a compressional wave is made ofcompressions and rarefactions When an end of the tuning forkmoves outward it forms a compression on that side by pushingthe molecules in air together The compression moves away fromthe tuning fork as these molecules collide with other molecules inair When the end of the tuning fork moves back a rarefaction isformed where the molecules are farther apart As the tuning forkvibrates it produces a series of compressions and rarefactions thattravels outward This series of compressions and rarefactions isthe sound wave that you hear

The Speed of SoundA sound wave moves in air as collisions between the mole-

cules in air transfer energy from place to place Sound waves alsocan move in other materials The material in which a sound wavemoves is called a medium Just as in air sound waves travel insolids liquids and other gases as a vibrating object transfersenergy to the particles in the material However sound wavescannot travel in empty space where there are no particles

Sound

Figure 1 A vibrating tuning fork

produces compressions and rarefac-

tions that travel outward from the

tuning fork These compressions

and rarefactions form a sound

wave

Reading Guide

Explain how sound travels

through different mediums Explain different properties of

sound Discuss the Doppler effect Identify ways sound can be used

Sounds are one way that you learn

about the world around you

Review Vocabulary

vibration rhythmic back-and-forth

motion

New Vocabulary

bull intensity

bull loudness

bull decibel

bull pitch

bull Doppler effect

Compression

Rarefaction

GPS+_320

null

10198071

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SECTION 1 Sound 321

The Speed of Sound in Different Materials The speedof a sound wave in a medium depends on the type of substanceand whether it is a solid liquid or gas For example Table 1

shows the speed of sound in different mediums at room temper-ature In general sound travels slowest in gases and fastest insolids

Temperature and the Speed of Sound The speed ofsound waves also depends on the temperature of the mediumAs the temperature of a substance increases its atoms andmolecules move faster At a higher temperature atoms andmolecules collide with each other more frequently As a resultsound waves move faster For example in air at a temperature of0C sound travels at a speed of 331 ms but in air at a temper-ature of 20C sound travels at 343 ms

Amplitude and Energy of Sound WavesThink about the differences among sounds you hear Some

are loud others are soft The flute plays high notes whereas thetuba is much lower What properties of sound waves cause thesedifferences in the sounds you hear

Recall that the amount of energy a wave carries correspondsto its amplitude For a compressional wave amplitude is relatedto the density of the particles in the compressions and rarefac-tions A vibrating object makes a wave by transferring energy tothe medium More energy is transferred to the medium whenthe particles of the medium are forced closer together in thecompressions and spread farther apart in the rarefactions Lookat Figure 2 A sound wave has a higher amplitude and carriesmore energy when particles in the medium are closer togetherin the compressions and more spread out in the rarefactions

Compression Rarefaction

Low-amplitude sound wave

Compression Rarefaction

High-amplitude sound wave

Figure 2 The amplitude of a

sound wave depends on the density

of the particles in the compressions

and rarefactions

In a high-amplitude sound wave

particles are tightly packed in the

compressions and far apart in the

rarefactions

In a low-amplitude sound wave

particles are less tightly packed in

the compressions and not as far

apart in the rarefactions

Table 1 Speed of Soundin Different Mediums

Medium Speed of Sound (ms)

Air (20degC) 343

Cork 500

Water 1498

Brick 3650

Aluminum 5000

GPS+_321

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10762286

eng - iTunNORM 0000039B 00000000 000024E4 00000000 0000BED0 00000000 00006069 00000000 00005378 00000000

Intensity and LoudnessImagine you are listening to music from your CD player

Sound waves produced by the CD player travel through the airand transfer energy from the CD player to your ears The energythat reaches your ears depends not only on the amplitude of thesound waves but also on how close you are to the CD playerFigure 3 shows that as you get farther from a source of soundthe energy of the sound waves is spread over a greater area Theamount of energy transferred by a sound wave through a certainarea each second is the intensity of the sound wave As soundwaves travel away from the source of the sound the intensity ofthe waves decreases as the waves spread out This means that asyou get farther from the source less energy reaches your earseach second

Loudness When you hear different sounds you do not needspecial equipment to know which sounds have greater intensityYour ears and brain can tell the difference Loudness is thehuman perception of sound intensity As the intensity of asound wave increases the loudness of the sound also increases

How are intensity and loudness related

A Scale for Sound Intensity The intensity of sound can bedescribed using a measurement scale Each unit on the scale forsound intensity is called a decibel abbreviated dB On this scalethe faintest sound that most people can hear is 0 dB Soundswith intensity levels above 120 dB may cause pain and perma-nent hearing loss During some rock concerts sounds reach thisdamaging intensity level Wearing ear protection such asearplugs around loud sounds can help protect against hearingloss Figure 4 shows some sounds and their intensity levels indecibels

Figure 4 The decibel scale meas-

ures the intensity of sound

Identify where a normal speakingvoice would fall on the scale

Figure 3 The intensity of a

sound wave decreases as the wave

spreads out from the source of the

sound The energy of the wave is

spread over a larger area as the

wave spreads out

Whisper

Rustling

leaves

Noisy

restaurant

20 25 50 75 80 100 110 12015

Purring

cat

Average

home

Vacuum

cleaner

Jet plane

taking off

Power

mowerPain

threshold

0dB 150

Loudness in Decibels

322 CHAPTER 11 Sound and Light

GPS+_322

null

11326502

eng - iTunNORM 0000036D 00000000 00002027 00000000 00005FB6 00000000 0000601D 00000000 0000E76D 00000000

SECTION 1 Sound 323

Pitch and FrequencyYou might be familiar with the music

scale do re mi fa sol la ti do shown inFigure 5 If you were to sing this scale youwould hear the pitch of your voice gethigher Pitch is the human perception ofthe frequency of sound waves Pitch getshigher as the frequency of the sound wavesincreases

Frequency Frequency is a measure of how many wavelengthspass a particular point each second For a compressional wavesuch as sound the frequency is the number of compressions orthe number of rarefactions that pass by each second Frequencyis measured in hertz (Hz) A frequency of 1 Hz means that onecomplete wavelength passes by in 1 s

A healthy human ear can hear sound waves with frequenciesfrom about 20 Hz to 20000 Hz The human ear is most sensi-tive to sounds in the range of 440 Hz to about 7000 Hz In thisrange most people can hear much fainter sounds than they canat higher or lower frequencies

Ultrasonic and Infrasonic Waves Most people canrsquot hearsound frequencies above 20000 Hz which are called ultrasonicwaves Dogs can hear sounds with frequencies up to about35000 Hz and bats can detect frequencies higher than 100000Hz Even though humans canrsquot hear ultrasonic waves they havea number of uses For example ultrasonic waves directed intothe human body are used in medical diagnosis and treatmentUltrasonic waves are reflected by objects underwater and can beused to determine the size shape and depth of underwaterobjects

Infrasonic or subsonic waves have frequencies below20 Hzmdashtoo low for most people to hear These waves are pro-duced by sources that vibrate slowly such as wind heavymachinery and earthquakes Although you canrsquot hear infrasonicwaves you might feel them as a rumble inside your body

The Doppler EffectImagine that you are standing at the side of a racetrack with

race cars zooming past As they move toward you the pitches oftheir engines become higher As they move away the pitchesbecome lower The change in pitch or frequency due to therelative motion of a wave source is called the Doppler effect

Figure 5 Every note has a

different frequency which gives it

a distinct pitch

Describe how pitch changes whenfrequency increases

C

do

262

Hz

D

re

294

Hz

E

mi

330

Hz

F

fa

349

Hz

G

sol

392

Hz

A

la

440

Hz

B

ti

494

Hz

C

do

523

Hz

Comparing IntensityProcedure 1 Complete the safety form

2 Tie the middle of a 50-cm

length of string to a metal

object such as a spoon3 Wrap each end of the

string around a finger on

each hand Place one of

these fingers in each ear

4 Swing the object so it

bumps against a table or

a chair Note the sound

5 Take your fingers out of

your ears and repeat

step 4

Analysis1 Compare the sounds you

heard in both trials

2 Compare the intensity of

the sound waves that

reached your

ears in both

trials

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324 CHAPTER 11 Sound and Light

A Moving Source of Sound As a race car moves it producessound waves in the form of compressions and rarefactions InFigure 6A the race car creates a compression labeled ACompression A moves through the air toward the flagger By thetime compression B leaves the race car in Figure 6B the car hasmoved forward Because the car has moved since the time it createdcompression A compressions A and B are closer together in frontof the car than they would be if the car had stayed still Because thecompressions are closer together more compressions pass by theflagger each second than if the car had been at rest As a result theflagger hears a higher pitch Figure 6B also shows that the compres-sions behind the moving car are farther apart resulting in a lowerfrequency The flagger hears a lower pitch after the car passes

A Moving Listener You also can hear the Doppler effect whenyou are moving past a sound source that is standing still Supposeyou were riding in a school bus and passed a building with a ring-ing bell The pitch would become higher as you approached thebuilding and lower as you rode away from it The Doppler effecthappens any time the source of a sound is changing position rel-ative to the listener It occurs no matter whether it is the soundsource or the listener that is moving The faster the change inposition the greater the change in frequency and pitch

How does pitch change if you are moving awayfrom a sound source

The race car creates compression A which

spreads through the air in all directions from the

point where it was created

The car is closer to the flagger when it creates

compression B Compressions A and B are closer

together in front of the car so the flagger hears a

higher-pitched sound

Figure 6 The Doppler effect occurs when the

source of a sound wave is moving relative to a

listener

Compression A

Compression B

Compression A

Red Shift The Dopplereffect can also beobserved in light wavesemanating from movingsourcesmdashalthough thesources must be movingat tremendous speedsAstronomers have learnedthat the universe isexpanding by observingthe Doppler effect in lightwaves Research thephenomenon known asred shift and explain inyour Science Journal howit relates to the Dopplereffect

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SECTION 1 Sound 325

Using SoundWhen sound waves strike an object they can be absorbed by

the object transmitted through the object or reflected from theobject By detecting the sound waves reflected from an objectthe size shape and location of an object can be determined

Echolocation and Sonar Some species of bats as well asdolphins whales and other animals use sound waves to detecttheir prey Echolocation is the process of locating objects byemitting sounds and detecting the sound waves that reflect back

Sonar is a system that uses the reflection of underwater soundwaves to detect objects First a sound pulse is emitted underwa-ter The sound waves travel in the water and are reflected whenthey strike an object such as a fish or a ship An underwatermicrophone detects the reflected waves Because the speed ofsound in water is known the distance to the object can be calcu-lated by measuring how much time passes between when thesound pulse is emitted and when the reflected signal is received

USING SONAR A sonar pulse returns in 300 s from a sunken ship that is directly below Find

the depth of the ship if the speed of the pulse is 1500 ms Hint The sonar pulse travels a

distance equal to twice the depth of the ship so use the equation d = st2 to find the depth

known values and the unknown value

Identify the known values

speed of sound in water s 1500 ms

time for round trip t 300 s

Identify the unknown value

depth of the ship d m

the problem

Substitute the known values s 1500 ms and t 300 s into the equation for depth

d s2t

(1500 m2s)(300 s)

12

(4500 m) 2250 m

your answer

Check your answer by dividing the distance by the time and multiplying by 2 The result

should be the speed of sound given in the problem

CHECK

SOLVE

means

means

means

IDENTIFY

Solve a Simple Equation

Find the speed of a sonar pulse that returns in 20 s from a ship at a depth of 1500 m

For more practice problems go to page 879 and visit Math Practice at gpesciencecom

Topic SonarVisit for Web

links to information about ways

sonar is used

Activity Research to find out

the different types of sonar Make

a poster that describes active and

passive sonar

gpesciencecom

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326 CHAPTER 11 Sound and Light

Self Check

1 Explain how sound travels from your vocal cords to

your friendrsquos ears when you talk

2 Explain how the loudness of a sound wave depends on

the intensity of the sound wave

3 Draw and label a diagram that explains the Doppler

effect

4 Describe at least three uses of ultrasonic technology in

medicine

5 Think Critically How could sonar technology be used

to locate deposits of oil and minerals

Summary

Sound Waves

bull Sound waves are compressional waves that

are produced by vibrating objects

bull Sound usually travels fastest in solids and

slowest in gases

bull Sound travels faster as the temperature of

the medium increases

Properties of Sound

bull The amplitude of sound waves increases as

the density of particles increases in the com-

pressions and decreases in rarefactions

bull Loudness is the human perception of the

intensity of sound waves Pitch is the human

perception of the frequency of sound waves

bull The Doppler effect is the change in the fre-

quency of a sound wave when the source of

the sound is moving relative to a listener

6 Calculate Time How long would it take a sound

wave from a car alarm to travel 10 km in air if the air

temperature were 0degC

7 Calculate Distance If sound travels in the ocean with

a speed of 1500 ms how far will a sonar pulse travel

in 45 s

Ultrasound in Medicine High-frequency soundwaves can also be used to remove dirt buildup on jew-elry and glassware One of the most important uses ofultrasonic waves though is in medicine Using spe-cial instruments medical professionals can sendultrasonic waves into a specific part of a patientrsquosbody Reflected ultrasonic waves are used to examinedifferent body parts and to detect and monitor cer-tain types of heart disease and cancer Ultrasoundimaging also is used to monitor the development of afetus as shown in Figure 7 However ultrasound doesnot produce good images of the bones and lungsbecause hard tissues and air absorb the ultrasonicwaves instead of reflecting them

High-frequency sound waves can be used to treatcertain medical problems For example sometimes small harddeposits of calcium compounds or other minerals form in thekidneys making kidney stones In the past physicians had toperform surgery to remove kidney stones Now ultrasonic treat-ments are commonly used to break them up instead Bursts ofultrasound create vibrations that cause the stones to break intosmall pieces that can easily pass out of the body with the urineA similar treatment is available for gallstones

Figure 7 Ultrasonic waves are

directed into a pregnant womanrsquos

uterus to form images of her fetus

More Section Review gpesciencecom

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Opaque

Translucent

Transparent

SECTION 2 Reflection and Refraction of Light 327

The Interaction of Light and MatterLook around your darkened room at night You know that

some of the objects are brightly colored but they look gray orblack in the dim light Turn on the light and you can see all theobjects in the room clearly including their colors What you seedepends on the amount of light in the room and the color of theobjects For you to see an object it must reflect or emit somelight that reaches your eyes

Absorption Transmission and Reflection Objects canabsorb light reflect light and transmit lightmdashallow light to passthrough them The type of matter in an object determines theamount of light it absorbs reflects and transmits For examplethe opaque material in the top candleholder in Figure 8 onlyabsorbs and reflects lightmdashno light passes through it As a resultyou cannot see the candle inside Materials that allow some lightto pass through them like the material of the middle candle-holder in Figure 8 are described as translucent You cannot seeclearly through translucent materials

Transparent materials such as the bottom candleholder inFigure 8 transmit almost all the light striking them so you cansee objects clearly through them Only a small amount of lightis absorbed and reflected by transparent materials

Reflection andRefraction of Light

Reading Guide

Describe how light waves interact

with matter Explain the difference between

regular and diffuse reflection Define the index of refraction of a

material Explain why a prism separates

white light into different colors

The images you see every day are

due to the behavior of light waves

Review Vocabulary

visible light an electromagnetic

wave with wavelengths between

about 400 and 700 billionths of a

meter

New Vocabulary

bull opaque

bull translucent

bull transparent

bull index of refraction

Figure 8 These candleholders

interact with light differently

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328 CHAPTER 11 Sound and Light

Reflection of LightHave you glanced in a mir-

ror today You see your reflec-tion in the mirror when light isreflected off you strikes themirror and is reflected off themirror into your eye Becauselight behaves as a wave itobeys the law of reflection asshown in Figure 9 Recall thataccording to the law of reflec-tion the angle at which a lightwave strikes a surface is thesame as the angle at which it is

reflected Light reflected from any surfacemdasha mirror or a sheetof papermdashobeys this law

Regular and Diffuse Reflection Why can you see yourreflection in a store window but not in a sheet of paper Theanswer has to do with the smoothness of the surfaces A smootheven surface such as a pane of glass produces a sharp image byreflecting parallel light waves in only one direction Reflection oflight waves from a smooth surface is regular reflection To causea regular reflection the roughness of a surface must be less thanthe wavelengths it reflects A sheet of paper has an uneven sur-face that causes incoming parallel light waves to be reflected inmany directions as shown in Figure 10 Reflection of light froma rough surface is diffuse reflection

Scattering Diffuse reflection is a type of scattering thatoccurs when light waves traveling in one direction are made totravel in many different directions Scattering also occurs whenlight waves traveling through the air reflect off small particlesAn example is light scattering off the small water droplets thatmake up a cloud Scattering causes the cloud to appear whiteeven though the droplets are transparent

What is scattering of light

Figure 9 According to the law of

reflection light is reflected so that

the angle of incidence always

equals the angle of reflection

Figure 10 A sheet of paper

has an uneven surface that

produces a diffuse reflection

Explain Use the law ofreflection to explain why arough surface causes parallellight waves to be reflected inmany directions

Mirror

i = angle of

incidence

i

r

i

r

r = angle of

reflection

Normal

Normal

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Refraction of LightWhat occurs when a light wave passes from one material to

anothermdashfrom air to water for example Recall that refractionis caused by a change in the speed of a wave when it passes fromone material to another If the light wave is traveling at an angleto the boundary between the materials and the speed of light isdifferent in the two materials the wave will be bent or refracted

Why does refraction occur

The Index of Refraction The amount of bending that takesplace depends on the speeds of light in both materials Thegreater the change in speed the more the light will be bent asit passes at an angle from one material to the other Figure 11

shows an example of refraction Every material has an index ofrefraction which is the ratio of the speed of light in a vacuum tothe speed of light in the material The index of refraction indi-cates how much the speed of light is reduced in the materialcompared to its speed in empty space

The larger the index of refraction the more light is sloweddown in the material For example because glass has a largerindex of refraction than air light moves more slowly in glassthan air The index of refraction is usually largest for solids andsmallest for gases

Prisms A sparkling glass prism hangs in a sunny windowrefracting the sunlight and projecting a colorful pattern onto thewalls of the room How does the refraction of light create thesecolors The spectrum of colors is produced because the speed oflight in a material also depends on the wave-length of the light In a glass prism light waveswith longer wavelengths such as red light wavesare slowed less than light waves with shorterwavelengths such as blue light waves

Figure 12 shows what occurs when whitelight passes through a prism White light suchas sunlight is made up of light waves withrange of wavelengths from red to blue The tri-angular prism refracts the light twicemdashoncewhen it enters the prism and again when itleaves the prism and reenters the air Becausethe longer wavelengths of light are slowed lessthan the shorter wavelengths are red light isbent the least As a result of these differentamounts of bending the different colors areseparated when they emerge from the prism

Figure 11 The spoon looks

broken because light waves are

refracted as they change speed

when they pass from the water to

the air

329

Figure 12 Refraction causes a

prism to separate a beam of white

light into different colors

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330 CHAPTER 11 Sound and Light

Self Check

1 Compare and contrast opaque transparent and

translucent materials Give one example of each

2 Discuss why you can see your reflection in a smooth

piece of aluminum foil but not in a crumpled ball of foil

3 Infer what happens to light waves that are reflected off

dust particles in the air

4 Explain what happens to white light when it passes

through a prism

5 Think Critically Suppose a material has the same index

of refraction as water How would a light wave change

direction as it traveled from water into this material

Summary

Light and Matter

bull The amount of light that is absorbed

reflected or transmitted depends on the

material making up the object

Reflection of Light

bull Light waves always obey the law of reflection

the angle of incidence equals the angle of

reflection

bull Regular reflection causes parallel light waves

to be reflected in only one direction

bull Diffuse reflection causes parallel light waves

to be reflected in many directions

bull Scattering occurs when light waves are reflected

and travel in many different directions

Refraction of Light

bull Refraction occurs when a light wave changes

speed in moving from one material to another

bull The index of refraction of a material indicates

how much light slows down in the material

6 Find an Angle A light wave strikes a mirror at an

angle of 42deg from the surface of the mirror What

angle does the reflected wave make with the normal

7 Find an Angle A light wave reflects from a mirror at

27deg from the normal What was the angle between

the mirror and the incident wave

Mirages When yoursquore traveling in a car you might see whatlooks like a pool of water on the road ahead As you get closerthe water seems to disappear Yoursquove seen a miragemdashan image ofa distant object produced by the refraction of light through airlayers of different densities Mirages result when the air atground level is much warmer or cooler than the air above asshown in Figure 13 The density of air increases as air cools andlight waves move slower in cooler air than in warmer air As aresult light waves are refracted as they pass through air layerswith different temperatures

Figure 13 Mirages result when

air near the ground is much

warmer or cooler than the air

above This causes light waves

reflected from an object to refract

creating one or more additional

images

MirageWarm air

Cool air

More Section Review gpesciencecom

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SECTION 3 Mirrors Lenses and the Eye 331

Light RaysLight sources send out light waves in all directions These

waves spread out like ripples on the surface of water spread outfrom the point of impact of a pebble You can think of the lightcoming from the source as being many narrow beams of light trav-eling in all directions Each narrow light beam is called a light ray

MirrorsA mirror is any surface that produces a regular reflection A pool

of still water a metal pan and even the back of a shiny spoon can bemirrors Mirrors can be flat curved inward or curved outward

Plane Mirrors A flat smooth mirror is a plane mirror Whenyou look in a plane mirror your image appears upright If youstand 1 m from the mirror your image appears 1 m behind themirror or 2 m from you In fact your image is what a friend stand-ing 2 m from you would see Figure 14 shows how your image isformed First light rays from a light source strike you Every pointthat is struck by the light rays reflects these rays so they travel out-ward in all directions If your friend were looking at you thesereflected light rays coming from you would enter her eyes so shecould see you However if a mirror is placed between you and yourfriend light rays are reflected from the mirror back to your eyes

Mirrors Lenses andthe Eye

Reading Guide

Describe how images are formed

by three types of mirrors Explain how convex and concave

lenses form images Explain how the human eye

enables you to see Describe how lenses are used to

correct vision problems

Mirrors and lenses are used in optical

instruments such as cameras and

telescopes

Review Vocabulary

reflection the process of changing

direction after striking a surface

New Vocabulary

bull plane mirror

bull concave mirror

bull convex mirror

bull convex lens

bull concave lens

Figure 14 Seeing an image of

yourself in a mirror involves two

sets of reflections light rays are

reflected from you and then are

reflected by the mirror

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332 CHAPTER 11 Sound and Light

Virtual and Real Images The forma-tion of an image by a plane mirror isshown in Figure 15 Your brain assumesthat light rays travel in a straight line As aresult rays that enter your eyes seem tocome from behind the mirror This makesthe image seem to be behind the mirrorHowever no light rays actually passthrough the place where the image seemsto be located This type of image is called avirtual image Plane mirrors always formvirtual images If light rays from an objectpass through the location of the image theimage is called a real image Curved mir-rors can form both real and virtual images

Concave Mirrors If the surface of a mirror is curved inwardit is called a concave mirror as shown in Figure 16 The opticalaxis is an imaginary straight line drawn perpendicular to thesurface of the mirror at its center Every light ray traveling par-allel to the optical axis is reflected through a point on the opti-cal axis called the focal point The distance from the center ofthe mirror to the focal point is called the focal length

The image formed by a concave mirror depends on the loca-tion of the object relative to the focal point Figure 16 shows acandle located more than twice the focal length from the mirrorAlthough many light rays come from each point on the candleonly two rays from the same point are shown Ray A passesthrough the focal point and then reflects off the mirror movingparallel to the optical axis Ray B travels parallel to the opticalaxis before reflecting off the mirror and passing through thefocal point The point where the two rays meet is the location ofthe image of the original point on the candle The image formedis a real image because light rays from the candle pass throughthe place where the image is located

Figure 16 Rays A and B start from the same

place on the candle travel in different directions

and meet again on the reflected image

Diagram how two other points on the image ofthe candle are formed

Figure 15 Your brain interprets

the light rays reflected by the

mirror as coming from a point

behind the mirror

Infer how the size of your imagein a plane mirror depends on yourdistance from the mirror

Focalpoint

Optical axis

Ray B

Ray A

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SECTION 3 Mirrors Lenses and the Eye 333

Images Produced by a ConcaveMirror When an object is between oneand two focal lengths from a concavemirror the image is real inverted andlarger than the object An object closerthan one focal length from a concavemirror produces a virtual image that isupright and larger than the object Noimage is produced if the object islocated at the focal point

Convex Mirrors When you are in astore look up toward one of the backcorners or at the end of an aisle to see ifa large rounded mirror is mountedthere You can see a large area of the store in such a mirror Amirror that curves outward like the back of a spoon is called aconvex mirror Light rays that hit a convex mirror diverge orspread apart after they are reflected Figure 17 shows how therays from an object are reflected by a convex mirror to form animage The reflected rays diverge and never meet so a convexmirror forms only a virtual image The image also is upright andsmaller than the actual object is

Describe the image formed by a convex mirror

LensesWhat do your eyes have in common with cameras eyeglasses

and microscopes Each of these contains at least one lens A lens is atransparent object with at least one curved surface that causes lightrays to refract The image that a lens forms depends on the shape ofthe lens Like curved mirrors lenses can be convex or concave

Convex Lenses A convex lens is thicker in the middle than atthe edges Its optical axis is an imaginary straight line that is per-pendicular to the surface of the lens at its thickest point When lightrays approach a convex lens traveling parallel to its opticalaxis the rays are refracted toward the center of the lens asin Figure 18 Light rays traveling along the optical axis arenot bent at all All light rays traveling parallel to the opti-cal axis are refracted so they pass through a single pointwhich is the focal point of the lens The less curved thesides of the lens the less light rays are bent As a resultlenses with flatter sides have longer focal lengths Figure 19

on the next page shows that convex lenses can form eitherreal or virtual images

Figure 18 Convex lenses are

thicker in the middle than at the

edges Light rays that are parallel

to the optical axis are refracted so

that they pass through the focal

point A light ray that passes

through the center of the lens is

not refracted

Figure 17 A convex mirror

forms a reduced upright virtual

image

Optical axis

Ray A

Ray B

Focallength

Focalpoint

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Figure 19

VISUALIZING IMAGES FORMED BY A CONVEX LENS

334 CHAPTER 11 Sound and Light

Aconvex lens can form images that are real or virtual enlarged or reduced and upright orinverted Just as for a concave mirror the type of image formed by a convex lens depends on thelocation of the object relative to the focal point of the lens

Optical axis

One

focal

length

Two

focal

lengthsRay B

Image

Ray A

Object

Focal

point

Optical axis

One

focal

length

Two

focal

lengths

Ray B

Ray AObject

Image

Focal

point

Optical axis

Ray B

ObjectRay A

One

focal

length

Focal

pointImage

If the object is more than two focal lengths from the lens the image formed is real inverted andsmaller than the object As the object moves farther from the lens the image becomes smaller

If the object is between one and two focal lengths from the lens the image formed is real invertedand larger than the object As the object moves closer to the focal point the image becomes larger

If the object is less than one focal length from the lens the image is virtual upright and larger thanthe object The image is virtual because the light rays from the object diverge after they pass throughthe lens The image becomes smaller as the object moves closer to the lens

SECTION 3 Mirrors Lenses and the Eye 335

Concave Lenses A concave lens is thinnerin the middle and thicker at the edges Asshown in Figure 20 light rays that passthrough a concave lens bend away from theoptical axis The rays spread out and nevermeet so a real image is never formed Theimage is always virtual upright and smallerthan the object is Concave lenses are used insome types of eyeglasses and some telescopesConcave lenses usually are used in combinationwith other lenses

What type of image is formed by a concave lens

The Human EyeWhat determines how well you can see the words on this

page If you donrsquot need eyeglasses the structure of your eye givesyou the ability to focus on these words and other objects aroundyou Look at Figure 21 Light enters your eye through a trans-parent covering on your eyeball called the cornea The corneacauses light rays to bend so that they converge The light thenpasses through an opening called the pupil Behind the pupil isa flexible convex lens Muscles attached to the lens change itsshape to help focus light forming a sharp image on your retina

The retina is the inner lining of your eye The retina con-tains light-sensitive cells that convert an image into electricalsignals These signals then are carried along the optic nerve toyour brain to be interpreted With this complex structurethe human eye is capable of seeing clearly in bright and dimconditions focusing on both near and far objects and alsodetecting colors

Figure 20 A concave lens

refracts light rays so they spread

out away from the optical axis

Classify Is a concave lens mostlike a concave mirror or a convexmirror

Optical axis

Retina

Focalpoint

Pupil

Cornea

Lens

Optic nerve

Figure 21 The cornea and lens in your eye

bend light rays so that a sharp image is

formed on the retina

Eye Doctors Optometristsand ophthalmologists treatmany different eye prob-lems They often useadvanced technology todiagnose and correct mal-functioning parts of theeye Research an eye prob-lem and how it is treatedWrite a paragraph describ-ing what parts of the eyeare affected by the problemand how doctors correct it

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336 CHAPTER 11 Sound and Light

Brightness and Intensity The human eye can adjust to thebrightness of the light that strikes it If you step outside on asunny day you may have to shade your eyes against the intensityof the sunlight Light intensity is the amount of light energy thatstrikes a certain area each second Brightness is the human per-ception of light intensity Sunlight seems bright because a largeamount of light energy strikes your retina each second Youreyes respond to bright light by decreasing the size of your pupilThis reduces the amount of light that enters your eye and strikesthe retina

Intensity depends on your distance from a light source Ifyou move away from a bare lightbulb you can see how theintensity of the light rapidly decreases Because light rays spreadout from the source less light energy strikes your retina thefarther away you are from the bulb

Correcting Vision ProblemsIf you have good vision you should be able to see objects

clearly when they are 25 cm or farther away from your eyes Asharp image of an object should be formed on your retinaHowever for many people the image is blurry or formed in thewrong place causing vision problems

Farsightedness If you can see distant objects clearly butcanrsquot bring nearby objects into focus then you are farsighted Inthis case the eyeball might be too short or the lens isnrsquot curvedenough to form a sharp image of nearby objects on the retinaas shown in Figure 22 To correct the problem convex lensescan be used to bend incoming light rays so they converge beforethey enter the eye

Experimenting withFocal LengthsProcedure1 Complete the safety form

2 Fill a glass test tube with

water and seal it with a

lid or stopper3 Type or print SULFUR

DIOXIDE in capital letters

on a piece of paper4 Set the test tube horizon-

tally over the words

Record your observations

5 Hold the tube at several

heights above the words

Record your observations

Analysis1 Describe how the words

changed as the height of

the test tube increased

2 Classify the image at each

height as real or virtual

Focal

point

Correctedfarsighted eye

Light fromnearby object

Focalpoint

Light fromnearby object

Farsighted eye

The focal length of a farsighted eye is too long to form

a sharp image of nearby objects on the retina

A convex lens in front of a farsighted eye enables a sharp

image of nearby objects to be formed on the retina

Figure 22 Farsightedness can

be corrected by convex lenses

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SECTION 3 Mirrors Lenses and the Eye 337

Self Check

1 Diagram how light rays from an object are reflected by

a convex mirror to form an image

2 Infer how the size of the image changes if an object

that is less than one focal length from a concave mirror

moves closer to the mirror

3 Explain how the focal length of a convex lens changes

as the sides of the lens become less curved

4 Compare the image of an object less than one focal

length from a convex lens with the image of an object

more than two focal lengths from the lens

5 Think Critically Describe the image formed by a light

source placed at the focal point of a convex lens

Summary

Mirrors

bull A plane mirror forms upright virtual images

bull The image formed by a concave mirror

depends on the location of the object relative

to the focal point

bull Convex mirrors always produce virtual upright

images that are smaller than the object

Lenses

bull The image formed by a convex lens depends

on the distance of the object from the lens

bull Concave lenses always form virtual upright

images that are smaller than the object

The Eye and Vision

bull The eye contains a lens that changes shape to

produce sharp images on the retina

bull Farsightedness occurs when the eye cannot

form a sharp image of nearby objects

Nearsightedness occurs when the eye cannot

form sharp images of distant objects

6 Calculate Object Distance If you looked through a

convex lens with a focal length of 15 cm and saw a

real inverted enlarged image what is the maximum

distance between the lens and the object

Nearsightedness If you have nearsighted friends you knowthat they can see only nearby objects clearly Their eyes cannotform a sharp image on the retina of an object that is far awayInstead the image is formed in front of the retina as shown inFigure 23 To correct this problem a nearsighted person canwear concave lenses Figure 23 shows how a concave lens causesincoming light rays from distant objects to diverge before theyreach the eye Then the rays can be focused by the eye to form asharp image on the retina

Figure 23 Nearsightedness can

be corrected with concave lenses

Focalpoint

Light fromdistant object

Nearsighted eye

Focalpoint

Light fromdistant object

Correctednearsighted eye

When a nearsighted person looks at distant objects a

sharp image is formed in front of the retina

A concave lens in front of a nearsighted eye makes light

rays diverge so a sharp image is formed on the retina

More Section Review gpesciencecom

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How can you see the back of your head You

can use two mirrors to view a reflection of a

reflection of the back of your head

Real-World ProblemHow many images are seen in two mirrors

Goal Infer how the number of images depends

on the angle between two mirrors

Materialsplane mirrors (2) protractor

masking tape paper clip

Safety Precautions

Handle glass mirrors and paper clips carefully

Procedure1 Complete the safety form

2 Lay one mirror on top of the other with the

mirror surfaces together Tape together one

side so they can open and close Use tape to

label them L and R for left and right

3 Open the mirrors and stand them on a sheet

of paper at an angle of 72deg

4 Bend one leg of a paper clip up 90deg and

place it close to the front of the R mirror

5 Count the number of images of the paper

clip you see in the R and L mirrors Record

these numbers in your data table

6 The mirrors create an image of a circle

divided into wedges Record the number

of wedges

7 Hold the R mirror still and slowly move the Lmirror to 90deg Record the numbers of images

of the clip and wedges in the circle Repeat

this time opening the mirrors to 120deg

Conclude and Apply1 Infer the relationship between the number

of wedges and paper clip images

2 Determine the angle that would divide a

circle into six wedges Hypothesize how

many images would be produced Test your

hypothesis

Reflections of Reflections

Demonstrate for younger students the

relationship between the angle of the

mirrors and the number of reflections

338 CHAPTER 11 Sound and Light

Angle

Number of Number

of Mirrors Paper Clip Images

of Wedges R L

72ordm

90ordm

120ordm

Images and Wedges Seen in the Mirrors

Do not write in this book

SECTION 4 Light and Color 339

Why Objects Have ColorWhy do some apples appear red while others look green or

yellow An objectrsquos color depends on the wavelengths of light itreflects Recall that white light is a blend of all colors of visiblelight When a red apple is struck by white light it reflects redlight back to your eyes and absorbs all of the other colorsFigure 24 shows white light striking a green leaf Only the wave-lengths corresponding to green light are reflected to your eyes

Although some objects appear to be black black isnrsquot acolor Black is the absence of visible light Objects that appearblack absorb all colors of light and reflect little or no light backto your eyes White objects appear to be white because theyreflect all colors of visible light

Why does a white object appear white

Colored Filters Wearing tinted glasses changesthe color of almost everything you see If the lensesare yellow the world takes on a golden glow If theyare rose colored everything looks rosy Somethingsimilar would occur if you placed a colored clearplastic sheet over this white page The paper wouldappear to be the same color as the plastic The plasticsheet and the tinted lenses are filters A filter is atransparent material that transmits one or more col-ors of light but absorbs all others The color of a fil-ter is the color of the light that it transmits

Light and Color

Reading Guide

Explain how you see color Describe the difference between

light color and pigment color Predict what happens when dif-

ferent colors are mixed

From traffic lights to great works of

art color is an important part of your

world

Review Vocabulary

retina inner layer of the eye con-

taining cells that convert light

images into electrical signals

New Vocabulary

bull pigment

Figure 24 This leaf absorbs all

wavelengths of visible light except

the wavelengths you see as green

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340 CHAPTER 11 Sound and Light

Looking Through Colored Filters Figure 25 shows howthe color of an object can change when you look at it throughvarious colored filters The cooler looks blue under white lightbecause it reflects only the wavelengths of blue light that strikeit If you look at the cooler through a blue filter the cooler stilllooks blue because the blue filter transmits the reflected bluelight However if you look at the cooler through a red filter thecooler seems black because the red filter blocks the blue lightreflected by the cooler

Why does a blue object appear black whenviewed through a red filter

Seeing ColorAs you approach a busy intersection the color of the traffic

light changes from green to yellow to red On the cross street thecolor changes from red to green At a busy intersection trafficsafety depends on your ability to detect color changes rapidlyHow do you see colors

Light and the Eye In a healthy eye light enters the eyethrough the cornea is focused by the lens and finally forms animage on the retina The retina is made up of two types of cellsthat absorb light as shown in Figure 26 When these cellsabsorb light energy chemical reactions convert light energy intonerve impulses that are transmitted to the brain One type ofcell in the retina called a cone enables you to distinguish colorsand detailed shapes of objects Cones need bright light to gener-ate nerve impulses so they do not operate in dim light As aresult even brightly colored objects might look gray or black indim light

Figure 25 The color of this

cooler changes when viewed

through different color filters

Topic Color BlindnessVisit for Web

links to information about the

causes of color blindness

Activity Research the causes

and types of color blindness Find

out how cones are related to the

ability to distinguish colors

gpesciencecom

GPS+_340

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SECTION 4 Light and Color 341

Cones and Rods Your eyes have three types of cones each ofwhich responds to a different range of wavelengths Red conesrespond to mostly red and yellow light Green cones respond tomostly yellow and green light Blue cones respond to mostlyblue and violet light The second type of cell in the retina calleda rod is sensitive to dim light and enables you to see at nightHowever rod cells do not enable you to see colors

Interpreting Color Why does a bananalook yellow The light reflected by the

banana causes the cone cells that are sensitive to red and greenlight to send signals to your brain Your brain could get the samesignal if a mixture of red light and green light reached your eyesThis mixture also would cause your red and green cones torespond and you would see the color yellow As a result lightwith wavelengths corresponding to yellow light and light that isa mixture of red and green light both cause the color yellow tobe seen What happens when you look at a white shirt You seewhite when all wavelengths of visible light enters your eyes Thenall three sets of cones cells send signals to the brain The com-bination of these signals cause you to see the shirt as white

Color Blindness If one or more of your sets of cone cellsdo not function properly you might not be able to distinguishcertain colors This condition is called color blindness orcolor deficiency About eight percent of men and one-halfpercent of women have some form of color blindness Themost common form of color blindness makes it difficult todistinguish between red and green Figure 27 shows an imagethat is used in a test for redndashgreen color blindness Becausered and green are used in traffic signals drivers and pedestri-ans must be able to identify them

Retina

Rod

Cone

Lens

Figure 27 Color blindness is an

inherited sex-linked condition in

which certain sets of cones in the

retina do not function properly

Identify the number that you seein the dots

Figure 26 Light enters the eye

and focuses on the retina The two

types of light-detecting cells

that make up the retina

are called rods and cones

GPS+_341

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342 CHAPTER 11 Sound and Light

Mixing ColorsIf you have ever browsed through a paint store you have

probably seen displays where customers can select paint samplesof almost every imaginable color The colors are a result of mix-tures of pigments For example you might have mixed blue andyellow paint to produce green paint A pigment is a coloredmaterial that is used to change the color of other substancesThe color of a pigment results from the different wavelengths oflight that the pigment reflects

Mixing Colored Lights From the glowing orange of a sun-set to the deep blue of a mountain lake all the colors you see canbe made by mixing three colors of light These three colorsmdashred green and bluemdashare the primary colors of light They cor-respond to the three different types of cones in the retina ofyour eye When mixed together in equal amounts they producewhite light as Figure 28 shows Mixing the primary colors indifferent proportions can produce the colors you see

What are the primary colors of light

Paint Pigments If you were to mix equal amounts of redgreen and blue paint would you get white paint If mixing col-ors of paint were like mixing colors of light you would but mix-ing paint is different Paints are made with pigments Pigmentsproduce color as a result of the wavelengths of light they reflectPaint pigments usually are made of chemical compounds suchas titanium oxide a bright white pigment and lead chromatewhich is used for painting yellow lines on highways

Figure 28 White light is pro-

duced when the three primary col-

ors of light are mixed in equal

amounts

Color for PhotosynthesisPlant pigments determinethe wavelengths oflight for photosynthesisLeaves usually look greenbecause of the pigmentchlorophyll Chlorophyllabsorbs most wave-lengths of visible lightexcept green which itreflects However not allplants are green Researchdifferent plant pigmentsto find out how they allowplant species to survive indiverse habitats

GPS+_342

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SECTION 4 Light and Color 343

Self Check

1 Identity what colors are reflected and what colors are

absorbed if a white light shines on a red shirt

2 Discuss how the primary colors of light differ from the

primary pigment colors

3 Explain why a red apple would appear black if you

looked at it through a blue filter

4 Determine why a white fence appears to be white instead

of multicolored if all colors are present in white light

5 Think Critically Light reflected from an object passes

through a green filter then a red filter and finally a

blue filter What color will the object seem to be

Summary

Why Objects Have Color

bull The color of an object is determined by the

wavelengths of light it reflects

bull The color of a filter is the color of the light the

filter transmits

Seeing Color

bull Rod and cone cells are light-sensitive cells

found in the retina of the human eye

bull Rod cells are sensitive to dim light Cone cells

enable colors to be seen

bull There are three types of cone cells One type

responds to red light another to green light

and another to blue light

Mixing Colors

bull Red green and blue are the primary light

colors Any color of light can be created by

mixing these primary light colors

bull Any pigment color can be formed by mixing

the primary pigment colorsmdashmagenta cyan

and yellow

6 Use Percentages In the human eye there are about

120000000 rods If 90000000 rods trigger at once

what percentage of the total number of rods triggered

7 Convert Units The wavelengths of light are measured

in nanometers (nm) which equals 0000001 mm

Find the wavelength in mm of a light wave that has a

wavelength of 690 nm

Mixing Pigments You can make any pigment color by mixingdifferent amounts of the three primary pigmentsmdashmagenta(bluish red) cyan (greenish blue) and yellow In fact color print-ers use these pigments as well as black ink to make full-colorprints like the pages in this book A primary pigmentrsquos colordepends on the wavelengths of the light that it reflects Actuallypigments both absorb and reflect a range of colors in sending asingle color message to your eye For example in white lightyellow pigment appears yellow because it reflects red and greenlight but absorbs the other wavelengths of visible light The colorof a mixture of two primary pigments is determined by theprimary colors of light that both pigments reflect

Look at Figure 29 The area in the center where the colors alloverlap appears to be black because the three blended primarypigments absorb all the primary colors of light Recall that theprimary colors of light combine to produce white light They arecalled additive colors However when the primary pigment col-ors are combined they absorb all wavelengths of visible light andproduce black Because black results from the absence ofreflected light the primary pigments are called subtractive colors

Figure 29 The three primary

pigment colors appear to be black

when they are mixed

Describe how the primary pigmentcolors are similar to the primary col-ors of light

More Section Review gpesciencecom

GPS+_343

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Design Your OwnDesign Your Own

344

Real-World ProblemWhat loud noises do you enjoy and which ones do you find annoying

Most people enjoy a music concert performed by their favorite artist or

the booming displays of fireworks on the Fourth of July Most people

enjoy these loud sounds for short periods of time However certain

other loud noises such as traffic sirens and loud talking can be

annoying Constant annoying noises are called noise pollution What

can be done to reduce noise pollution What types of barriers will best

block out noise pollution

Form a HypothesisBased on your experiences with loud noises form a hypothesis that

predicts the effectiveness of different types of barriers at blocking out

noise pollution

Test Your HypothesisMake a Plan

1 Complete the safety form

2 Decide what type of barriers or materials you will test

3 Describe exactly how you will use these materials

Goals Design an experiment

that tests the effective-

ness of various types of

barriers and materials

for blocking out noise

pollution

Test different types of

materials and barriers

to determine the best

noise blocks

Possible Materialsradio CD player horn

drum or other loud

noise source

shrubs trees concrete

walls brick walls stone

walls wooden fences

parked cars or hanging

laundry

sound meter

meterstick or metric tape

measure

Blocking NfisePollution

4 Identify the controls and variables you will use in your

experiment

5 List the steps you will use and describe each step precisely

6 Prepare a data table in your Science Journal to record your

measurements

7 Organize the steps of your experiment in logical order

Follow Your Plan

1 Ask your teacher to approve your plan and data table before

you start

2 Conduct your experiment as planned

3 Test each barrier two or three times

4 Record the results from each test in your data table in your Science Journal

Analyze Your Data1 Identify the barriers that most effectively reduced noise pollution

2 Identify the barriers that least effectively reduced noise pollution

3 Compare the effective barriers and identify common characteristics that might

explain why they reduced noise pollution

4 Compare the natural barriers you tested with the artificial barriers Which type

of barrier best reduced noise pollution

5 Compare the different types of materials the barriers were made of Which

type of material best reduced noise pollution

Conclude and Apply1 Evaluate whether your results support your hypothesis

2 Predict how your results would differ if you used a louder source of noise such

as a siren

3 Infer from your results how people living near a

busy street could reduce noise pollution

4 Identify major sources of noise pollution in or

near your home How could they be reduced

5 Research how noise pollution can be

unhealthy

LAB 345

Draw a poster illustrating how builders and

landscapers could use certain materials to

better insulate a home or office from excess

noise pollution

346 CHAPTER 11 Sound and Light

A Haiku GardenThe Four Seasons in Poems and Prints

by Stephen Addiss with Fumiko and Akira Yamamoto

Respond to the Reading1 How do the illustrations help the reader

better understand the poems2 What do you think is meant by the

word lingering in the Haiku about springsunlight

3 Linking Science and Writing Writeone haiku about summer and anotherabout fall In one poem use color tohelp you describe the season In theother use light or some property oflight to help describe the season

Research has deter-mined that there is a

connection between color and mood Warmcolors have longer wavelengths and can bemore stimulating Cool colors which haveshorter wavelengths tend to have a calmingor soothing effect on people Light and colorhave long been used as literary symbols Doesthe use of color change what you imaginewhen you read the haiku

UnderstandingLiteratureJapanese Haiku A haiku is a verse thatconsists of three lines and 17 syllables inthe Japanese language The first and thirdlines have five syllables each and themiddle line has seven syllables Why isimagination important in reading haiku

Lingering

in every pool of watermdash

spring sunlightIssa

Withered by winter

the sound of the windmdash

one-color worldBasho

Sound

1 Sound waves are compressional waves thattravel only in matter

2 The speed of sound in a material dependson the type of material as well as itstemperature

3 Loudness depends on a sound waversquos inten-sity Pitch depends on a sound waversquosfrequency

4 Sound waves are used in echolocationsonar and medical imaging

Reflection and Refractionof Light

1 Light can be absorbed reflected or trans-mitted by a material

2 When light waves are reflected theyobey the law of reflectionmdashthe angle ofincidence equals the angle of reflection

3 A light wave is refracted or bent whenit changes speed as it travels at an anglefrom one material to another

Mirrors Lenses andthe Eye

1 Plane mirrors form upright virtual images

2 Images formed by concave mirrors andconvex lenses depend on the location ofthe object relative to the focal point

3 Convex mirrors and concave lenses formvirtual upright images that are smallerthan the object

4 The lens in the human eye changes shape toproduce a sharp image on the retina

Light and Color

1 You see color when light is reflected offobjects and into your eyes

2 Cone cells in the retina are light-sensitivecells that enable you to distinguish colors

3 Red blue and green are the three primarycolors of light and can be mixed to form allother colors

4 The primary pigment colors are magentacyan and yellow

CHAPTER STUDY GUIDE 347

Use the Foldable you made at the beginningof the chapter to help you review sound and light

Interactive Tutor gpesciencecom

Complete each statement with the correctvocabulary word or phrase

1 A change in frequency due to a movingsound source is due to the

2 A flat smooth surface that reflects light andforms an image is a(n)

3 An object is if you can seethrough it clearly

4 The of a material indicates howmuch the speed of light in the materialchanges as light passes through

5 You can change the color of white paint byadding a(n) to it

6 A(n) is a reflecting surface thatcurves outward like the back of a spoon

7 The human perception of the intensity of asound wave is

Choose the word or phrase that best answerseach question

8 Which of the following best describes imageformation by a plane mirrorA) A real image is formed in front of the mirrorB) A real image is formed behind the mirrorC) A virtual image is formed in front of the

mirrorD) A virtual image is formed behind the mirror

9 For a sound with low pitch what else isalso always lowA) amplitude C) wavelengthB) frequency D) wave velocity

10 Which of the following occurs when asound source moves away from youA) The soundrsquos velocity decreasesB) The soundrsquos loudness increasesC) The soundrsquos frequency decreasesD) The soundrsquos frequency increases

Use the table below to answer question 11

11 Based on the data in the table abovewhich of the following would be the speedof sound in air at 30degCA) 3404 ms C) 3494 msB) 3464 ms D) 3534 ms

12 What happens to a light ray travelingparallel to the optical axis of a convexlens that passes through the lensA) It travels parallel to the optical axisB) It passes through the focal pointC) It is bent away from the optical axisD) It forms a virtual image

13 Light waves of which color are bent mostwhen passing through a prismA) blue C) violetB) red D) yellow

14 Which way does a concave lens bend lightA) toward its optical axisB) toward its centerC) toward its edgesD) toward its focal point

Speed of Sound in Air

Temp peed( s)

4

4

4

348 CHAPTER REVIEW

concave lens p 335concave mirror p 332convex lens p 333convex mirror p 333decibel p 322Doppler effect p 323index of refraction p 329intensity p 322

loudness p 322opaque p 327pigment p 342pitch p 323plane mirror p 331translucent p 327transparent p 327

Vocabulary PuzzleMaker gpesciencecom

Use the illustration below to answer question 15

15 Describe how the position of the candlechanged if the image of the candle movedaway from the focal point

16 Apply Acoustic scientists sometimes doresearch in rooms that absorb all soundwaves How could such a room be used tostudy how bats find their food

17 Compare White light passes through atranslucent pane of glass and shines on ashirt Both the translucent glass and theshirt appear green Compare the colors oflight that are absorbed and transmitted bythe glass and the shirt

18 Infer Most mammals including dogs andcats canrsquot see colors Infer how the retinaof a catrsquos eye might be different from theretina of a human eye

19 Determine whether a convex lens could forman image that is enlarged real and upright

20 Infer A car comes to a railroad crossingThe driver hears a trainrsquos whistle and itspitch becomes lower What can beassumed about how the train is moving

21 Compare and contrast the reflection of lightfrom a white wall with a rough surfacewith the reflection of light from a mirror

Optical axis

One

focal

length

Two

focal

lengths

Image

Ray A

Object

Focal

point

Interpreting Graphics 22 Infer why a convex mirror and a concavelens can never produce a real image

23 Predict what color a white shirt wouldappear to be if the light reflected from theshirt passed through a red filter and thenthrough a green filter

24 Explain why windows might begin to rattlewhen an airplane flies overhead

25 Communicate Some people enjoy usingsnowmobiles Others object to the noisethat they make Write a proposal for a pol-icy that seems fair to both groups for theuse of snowmobiles in a state park

CHAPTER REVIEW 349

Use the wave speed equation ν ƒλ to answer

questions 26 and 27

26 Calculate Frequency A sonar pulse has awavelength of 30 cm and a speed inwater of 1500 ms Find its frequency

27 Calculate Wavelength What is the wave-length of a sound wave with a fre-quency of 440 Hz if the speed of soundin air is 340 ms

28 Calculate Angle of Incidence A light ray isreflected from a mirror If the anglebetween the incident ray and thereflected ray is 136deg what is the angleof incidence

29 Determine Object Distance You hold anobject in front of a concave mirror witha focal length of 30 cm If you do notsee a reflected image how far from themirror is the object

30 Calculate Speed The speed of light in avacuum is 300000 kms If the index ofrefraction of water is 133 what is thespeed of light in water

More Chapter Review gpesciencecom

1 Which of the following describes the imageformed by a convex mirror

A enlarged

B inverted

C real

D virtual

Use the figure below to answer question 2

2 Which of the following describes a light raythat passes through the focal point andthen is reflected by the mirror

A It travels parallel to the optical axis

B It forms a real image

C It is reflected back through the focal point

D It forms a virtual image

3 Why does an apple look red

A It reflects red light

B It absorbs red light

C It reflects green and blue light

D It reflects all colors of light except red

Use the figure below to answer questions 4 and 5

4 When the primary colors of light are addedtogether what color appears in area H

A cyan

B magenta

C white

D yellow

5 When the primary colors of light are addedtogether what color appears in area G

A cyan

B magenta

C white

D yellow

6 Which of the following increases as the fre-quency of a sound increases

A amplitude

B intensity

C loudness

D pitch

Red Blue

Green

F

H

G K

Focal pointOptical axis

350 STANDARDIZED TEST PRACTICE

Record your answers on the answer sheet provided by your teacher or on a sheet of paper

STANDARDIZED TEST PRACTICE 351

7 Which of the following parts of the eyeenable you to see colors in bright light

A cone cells

B cornea

C lens

D rod cells

Use the graph below to answer questions 8 and 9

8 Determine how far in centimeters theimage is from the lens when the object is15 centimeters from the lens

9 How far in centimeters is the object fromthe lens when the image distance andobject distance are equal

10 A shirt has stripes that are black and whitein white light If green light shines on thisshirt what colors will the black and whitestripes be

11 If you are on a moving train what hap-pens to the pitch of a crossing bell as youapproach the crossing and then moveaway from the crossing

Use the figure below to answer question 12

12 Describe the vision problem show by thefigure and explain how this vision prob-lem can be corrected

13 Explain why the human eye can see colorsbetter in bright light than in dim light

Image Distance fora Convex Lens

Ima

ge

dis

tan

ce (

cm)

30

25

20

15

10

5 10 15 20 25 30

Object distance (cm)

Standardized Test Practice gpesciencecom

Note Units Read carefully and make note of the units used in

any measurement

  • Glencoe Physical Science with Earth Science
    • Student Edition Table of Contents
      • Unit 1 Science and Technology
        • Chapter 1 The Nature of Science
          • Launch Lab Understanding Measurements
          • Foldables
          • Section 1 The Methods of Science
            • Science Online
            • Integrate History
            • Integrate Earth Science
            • Science Online
              • Section 2 Standards of Measurement
                • Applying Math Centimeters
                • Integrate Earth Science
                • Science Online
                • MiniLAB Determining the Density of a Pencil
                • Visualizing SI Dimensions
                  • Section 3 Communicating with Graphs
                    • Applying Math Temperature
                    • MiniLAB Graphing Temperature Change
                    • Lab Whats my graph
                    • Lab Design Your Own - Developing a Measurement System
                    • Science and Language Arts Thinking in Pictures and Other Reports from My Life with Autism
                      • Chapter 1 Study Guide
                      • Chapter 1 Review
                      • Chapter 1 Standardized Test Practice
                        • Chapter 2 Science Technology and Society
                          • Lab Technology in Your Life
                          • Foldables
                          • Section 1 Science and Technology
                            • MiniLAB Researching the Past
                            • Visualizing Technology Supplying Basic Needs
                            • Science Online
                              • Section 2 Forces that Shape Technology
                                • MiniLAB Evaluating the Benefits and Consequences of Technology
                                • Integrate Environment
                                • Integrate History
                                • Applying Science What impact does the accident at Chernobyl have on the future of nuclear power
                                • Science Online
                                • Lab Who contributes CO2
                                  • Section 3 Developing Technology
                                    • Integrate Life Science
                                    • Integrate Career
                                    • Lab Model and Invent - Care Package
                                    • Oops Accidents in Science A Slippery Situation
                                      • Chapter 2 Study Guide
                                      • Chapter 2 Review
                                      • Chapter 2 Standardized Test Practice
                                          • Unit 2 Motion Forces and Energy
                                            • Chapter 3 Motion Acceleration and Forces
                                              • Launch Lab Compare Speeds
                                              • Foldables
                                              • Section 1 Describing Motion
                                                • MiniLAB Measuring Average Speed
                                                • Science Online
                                                • Applying Math Average Speed
                                                • Integrate Astronomy
                                                • Science Online
                                                  • Section 2 Acceleration
                                                    • Integrate History
                                                    • Visualizing Acceleration
                                                      • Section 3 Motion and Forces
                                                        • Science Online
                                                        • MiniLAB Comparing Friction
                                                        • Lab Force and Acceleration
                                                        • Lab Design Your Own - Comparing Motion from Different Forces
                                                        • Science and Language Arts A Brave and Startling Truth
                                                          • Chapter 3 Study Guide
                                                          • Chapter 3 Review
                                                          • Chapter 3 Standardized Test Practice
                                                            • Chapter 4 The Laws of Motion
                                                              • Launch Lab The Force of Gravity
                                                              • Foldables
                                                              • Section 1 The First Two Laws of Motion
                                                                • MiniLAB Observing Inertia
                                                                • Science Online
                                                                • Applying Math The Acceleration of a Sled Solve a Simple Equation
                                                                  • Section 2 Gravity
                                                                    • Science Online
                                                                    • Integrate Earth Science
                                                                    • MiniLAB Observing Centripetal Force
                                                                    • Lab Gravity and Air Resistance
                                                                      • Section 3 The Third Law of Motion
                                                                        • Integrate Career
                                                                        • Visualizing Rocket Motion
                                                                        • Applying Math The Momentum of a Sprinter
                                                                        • Lab The Momentum of Colliding Objects
                                                                        • Science and History Newton and the Plague
                                                                          • Chapter 4 Study Guide
                                                                          • Chapter 4 Review
                                                                          • Chapter 4 Standardized Test Practice
                                                                            • Chapter 5 Energy
                                                                              • Launch Lab Energy Conversions
                                                                              • Foldables
                                                                              • Section 1 The Nature of Energy
                                                                                • Science Online
                                                                                • Applying Math Kinetic Energy
                                                                                • MiniLAB Interpreting Data from a Slingshot
                                                                                • Integrate Language Arts
                                                                                • Applying Math Gravitational Potential Energy
                                                                                • Lab Bouncing Balls
                                                                                  • Section 2 Conservation of Energy
                                                                                    • Visualizing Energy Transformations
                                                                                    • Integrate Environment
                                                                                    • MiniLAB Transforming Energy in a Paper Clip
                                                                                    • Science Online
                                                                                    • Integrate Health
                                                                                    • Lab Design Your Own - Swinging Energy
                                                                                    • Science and History The Impossible Dream
                                                                                      • Chapter 5 Study Guide
                                                                                      • Chapter 5 Review
                                                                                      • Chapter 5 Standardized Test Practice
                                                                                        • Chapter 6 Work and Machines
                                                                                          • Launch Lab Doing Work with a Simple Machine
                                                                                          • Foldables
                                                                                          • Section 1 Work
                                                                                            • Integrate Language Arts
                                                                                            • Applying Math Work
                                                                                            • MiniLAB Calculating Your Work and Power
                                                                                            • Applying Math Power
                                                                                              • Section 2 Using Machines
                                                                                                • MiniLAB Machines Multiplying Force
                                                                                                • Science Online
                                                                                                • Integrate Chemistry
                                                                                                  • Section 3 Simple Machines
                                                                                                    • Integrate History
                                                                                                    • Visualizing Levers in the Human Body
                                                                                                    • Science Online
                                                                                                    • Lab Levers
                                                                                                    • Lab Model and Invent - Using Simple Machines
                                                                                                    • Science and Society The Science of Very Very Small
                                                                                                      • Chapter 6 Study Guide
                                                                                                      • Chapter 6 Review
                                                                                                      • Chapter 6 Standardized Test Practice
                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                          • Launch Lab Relative Sizes of Earth the Moon and the Sun
                                                                                                          • Foldables
                                                                                                          • Section 1 Earth in Space
                                                                                                            • Science Online
                                                                                                            • Integrate Physics
                                                                                                              • Section 2 Time and Seasons
                                                                                                                • MiniLAB Modeling the Suns Rays at Solstice
                                                                                                                • Lab Comparing the Angle of Sunlight to Intensity
                                                                                                                  • Section 3 Earths Moon
                                                                                                                    • Applying Math Tides
                                                                                                                    • MiniLAB Modeling Phases and Eclipses
                                                                                                                    • Integrate History
                                                                                                                    • Integrate History
                                                                                                                    • Science Online
                                                                                                                    • Visualizing Water on the Moon
                                                                                                                    • Lab Identifying the Moons Surface Features and Apollo Landing Sites
                                                                                                                    • Oops Accidents in Science Even Great Scientists Make Mistakes
                                                                                                                      • Chapter 7 Study Guide
                                                                                                                      • Chapter 7 Review
                                                                                                                      • Chapter 7 Standardized Test Practice
                                                                                                                        • Chapter 8 The Solar System
                                                                                                                          • Launch Lab The Size of the Solar System
                                                                                                                          • Foldables
                                                                                                                          • Section 1 Planet Motion
                                                                                                                            • Integrate History
                                                                                                                            • MiniLAB Plotting Retrograde Motion
                                                                                                                            • Integrate Physics
                                                                                                                            • Applying Math Heliocentric Longitude (HL)
                                                                                                                              • Section 2 The Inner Planets
                                                                                                                                • Science Online
                                                                                                                                • Integrate Chemistry
                                                                                                                                • Lab Interpreting Features of Marss Surface
                                                                                                                                  • Section 3 The Outer Planets
                                                                                                                                    • Integrate Language Arts
                                                                                                                                    • Visualizing What Galileo Saw
                                                                                                                                    • Science Online
                                                                                                                                    • MiniLAB Comparing Sizes of Outer and Inner Planets
                                                                                                                                      • Section 4 Life in the Solar System
                                                                                                                                        • Lab Design Your Own - Testing Unknown Soil Samples for Life
                                                                                                                                        • Science Stats Night Sky Wonders
                                                                                                                                          • Chapter 8 Study Guide
                                                                                                                                          • Chapter 8 Review
                                                                                                                                          • Chapter 8 Standardized Test Practice
                                                                                                                                              • Unit 3 Energy in Motion
                                                                                                                                                • Chapter 9 Heat and States of Matter
                                                                                                                                                  • Launch Lab Expansion of a Gas
                                                                                                                                                  • Foldables
                                                                                                                                                  • Section 1 Temperature and Thermal Energy
                                                                                                                                                    • Applying Math Converting to Celsius
                                                                                                                                                    • Science Online
                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                    • Applying Math Change in Thermal Energy
                                                                                                                                                      • Section 2 States of Matter
                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                        • Science Online
                                                                                                                                                        • MiniLAB Comparing States of Water
                                                                                                                                                          • Section 3 Transferring Thermal Energy
                                                                                                                                                            • MiniLAB Comparing Thermal Conductors
                                                                                                                                                            • Visualizing Convection Currents
                                                                                                                                                            • Lab Convection in Gases and Liquids
                                                                                                                                                              • Section 4 Using Thermal Energy
                                                                                                                                                                • Integrate History
                                                                                                                                                                • Science Online
                                                                                                                                                                • Lab Conduction in Gases
                                                                                                                                                                • Science Stats Surprising Thermal Energy
                                                                                                                                                                  • Chapter 9 Study Guide
                                                                                                                                                                  • Chapter 9 Review
                                                                                                                                                                  • Chapter 9 Standardized Test Practice
                                                                                                                                                                    • Chapter 10 Waves
                                                                                                                                                                      • Launch Lab How do waves transfer energy
                                                                                                                                                                      • Foldables
                                                                                                                                                                      • Section 1 The Nature of Waves
                                                                                                                                                                        • Visualizing Formation of Ocean Waves
                                                                                                                                                                        • Science Online
                                                                                                                                                                          • Section 2 Wave Properties
                                                                                                                                                                            • MiniLAB Observing Wavelength
                                                                                                                                                                            • Integrate Social Studies
                                                                                                                                                                            • Applying Math The Speed of Sound
                                                                                                                                                                            • Lab Wave Speed and Tension
                                                                                                                                                                              • Section 3 The Behavior of Waves
                                                                                                                                                                                • Science Online
                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                • MiniLAB Experimenting with Resonance
                                                                                                                                                                                • Lab Measuring Wave Properties
                                                                                                                                                                                • Science and History Making Waves
                                                                                                                                                                                  • Chapter 10 Study Guide
                                                                                                                                                                                  • Chapter 10 Review
                                                                                                                                                                                  • Chapter 10 Standardized Test Practice
                                                                                                                                                                                    • Chapter 11 Sound and Light
                                                                                                                                                                                      • Launch Lab What sound does a ruler make
                                                                                                                                                                                      • Foldables
                                                                                                                                                                                      • Section 1 Sound
                                                                                                                                                                                        • MiniLAB Comparing Intensity
                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                        • Science Online
                                                                                                                                                                                        • Applying Math Using Sonar
                                                                                                                                                                                          • Section 2 Reflection and Refraction of Light
                                                                                                                                                                                          • Section 3 Mirrors Lenses and the Eye
                                                                                                                                                                                            • Visualizing Images Formed by a Convex Lens
                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                            • MiniLAB Experimenting with Focal Lengths
                                                                                                                                                                                            • Lab Reflections of Reflections
                                                                                                                                                                                              • Section 4 Light and Color
                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Lab Design Your Own - Blocking Noise Pollution
                                                                                                                                                                                                • Science and Language Arts A Haiku Garden The Four Seasons in Poems and Print
                                                                                                                                                                                                  • Chapter 11 Study Guide
                                                                                                                                                                                                  • Chapter 11 Review
                                                                                                                                                                                                  • Chapter 11 Standardized Test Practice
                                                                                                                                                                                                    • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                      • Launch Lab Global Jigsaw Puzzle
                                                                                                                                                                                                      • Foldables
                                                                                                                                                                                                      • Section 1 Evolution of Earths Crust
                                                                                                                                                                                                        • Applying Math Spreading Distances
                                                                                                                                                                                                        • Integrate Physics
                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                          • Section 2 Earthquakes
                                                                                                                                                                                                            • MiniLAB Demonstrating Four Types of Stress
                                                                                                                                                                                                            • Visualizing Earthquake-Proof Buildings
                                                                                                                                                                                                              • Section 3 Earths Interior
                                                                                                                                                                                                              • Section 4 Volcanoes
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • MiniLAB Modeling Lava Viscosity
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                • Lab A Case for Pacific Plate Motion
                                                                                                                                                                                                                • Lab Earthquake Earthquake Wheres the earthquake
                                                                                                                                                                                                                • Science and History Volcano Weather
                                                                                                                                                                                                                  • Chapter 12 Study Guide
                                                                                                                                                                                                                  • Chapter 12 Review
                                                                                                                                                                                                                  • Chapter 12 Standardized Test Practice
                                                                                                                                                                                                                      • Unit 4 Forms of Energy
                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                          • Launch Lab Electric Circuits
                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                          • Section 1 Electric Charge
                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                            • Visualizing Lightning
                                                                                                                                                                                                                            • MiniLAB Investigate Charged Objects
                                                                                                                                                                                                                              • Section 2 Electric Current
                                                                                                                                                                                                                                • MiniLAB Investigating Battery Addition
                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                • Lab Identifying Conductors and Insulators
                                                                                                                                                                                                                                  • Section 3 Electrical Energy
                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                    • Applying Math Power Used by a Clothes Dryer
                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                    • Applying Math Electrical Energy Used by a Microwave Oven
                                                                                                                                                                                                                                    • Lab Design Your Own - Comparing Series and Parallel Circuits
                                                                                                                                                                                                                                    • Science and Language Arts Invisible Man
                                                                                                                                                                                                                                      • Chapter 13 Study Guide
                                                                                                                                                                                                                                      • Chapter 13 Review
                                                                                                                                                                                                                                      • Chapter 13 Standardized Test Practice
                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                          • Launch Lab The Strength of Magnets
                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                          • Section 1 Magnetism
                                                                                                                                                                                                                                            • MiniLAB Observing Magnetic Interference
                                                                                                                                                                                                                                            • Integrate Earth Science
                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                            • Applying Science How can magnetic parts of a junk car be salvaged
                                                                                                                                                                                                                                            • MiniLAB Making Your Own Compass
                                                                                                                                                                                                                                              • Section 2 Electricity and Magnetism
                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                  • Section 3 Producing Electric Current
                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                    • Visualizing Motors and Generators
                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                    • Lab Electricity and Magnetism
                                                                                                                                                                                                                                                    • Lab Design Your Own - Controlling Electromagnets
                                                                                                                                                                                                                                                    • Science and History Body Art
                                                                                                                                                                                                                                                      • Chapter 14 Study Guide
                                                                                                                                                                                                                                                      • Chapter 14 Review
                                                                                                                                                                                                                                                      • Chapter 14 Standardized Test Practice
                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                          • Launch Lab Can electromagnetic waves change materials
                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                          • Section 1 What are electromagnetic waves
                                                                                                                                                                                                                                                            • MiniLAB Investigating Electromagnetic Waves
                                                                                                                                                                                                                                                            • Applying Math The Speed of Light in Water
                                                                                                                                                                                                                                                              • Section 2 The Electromagnetic Spectrum
                                                                                                                                                                                                                                                                • MiniLAB Heating with Microwaves
                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                • Lab The Shape of Satellite Dishes
                                                                                                                                                                                                                                                                  • Section 3 Radio Communication
                                                                                                                                                                                                                                                                    • Visualizing Radio Broadcasts
                                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Lab Use the Internet - Radio Frequencies
                                                                                                                                                                                                                                                                    • Science and History Riding a Beam of Light
                                                                                                                                                                                                                                                                      • Chapter 15 Study Guide
                                                                                                                                                                                                                                                                      • Chapter 15 Review
                                                                                                                                                                                                                                                                      • Chapter 15 Standardized Test Practice
                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                          • Launch Lab Heating with Solar Energy
                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                          • Section 1 Fossil Fuels
                                                                                                                                                                                                                                                                            • Visualizing The Formation of Fossil Fuels
                                                                                                                                                                                                                                                                            • MiniLAB Designing an Efficient Water Heater
                                                                                                                                                                                                                                                                              • Section 2 Nuclear Energy
                                                                                                                                                                                                                                                                                • Integrate Earth Science
                                                                                                                                                                                                                                                                                • Integrate Social Science
                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                • Applying Science Can a contaminated radioactive site be reclaimed
                                                                                                                                                                                                                                                                                  • Section 3 Renewable Energy Sources
                                                                                                                                                                                                                                                                                    • MiniLAB Using Solar Power at Home
                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                    • Lab Solar Heating
                                                                                                                                                                                                                                                                                    • Lab Use the Internet How much does energy really cost
                                                                                                                                                                                                                                                                                    • Science and Society Reacting to Nuclear Energy
                                                                                                                                                                                                                                                                                      • Chapter 16 Study Guide
                                                                                                                                                                                                                                                                                      • Chapter 16 Review
                                                                                                                                                                                                                                                                                      • Chapter 16 Standardized Test Practice
                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                          • Lab Atmospheric Pressure
                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                          • Section 1 Earths Atmosphere
                                                                                                                                                                                                                                                                                            • MiniLAB Visualizing Convection
                                                                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                                                                            • Lab Visualizing a Temperature Inversion
                                                                                                                                                                                                                                                                                              • Section 2 Weather
                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Coriolis Effect
                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                  • Section 3 Climate
                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                    • Visualizing Earths Biogeophysical System
                                                                                                                                                                                                                                                                                                      • Section 4 Earths Changing Climates
                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                        • Applying Math Carbon Dioxide (CO2) Concentration
                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Investigating Microclimate
                                                                                                                                                                                                                                                                                                        • Science and Language Arts The Grapes of Wrath
                                                                                                                                                                                                                                                                                                          • Chapter 17 Study Guide
                                                                                                                                                                                                                                                                                                          • Chapter 17 Review
                                                                                                                                                                                                                                                                                                          • Chapter 17 Standardized Test Practice
                                                                                                                                                                                                                                                                                                              • Unit 5 Matter and Earth Materials
                                                                                                                                                                                                                                                                                                                • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                  • Launch Lab Demonstrate the Distillation of Water
                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                  • Section 1 Composition of Matter
                                                                                                                                                                                                                                                                                                                    • Visualizing Elements
                                                                                                                                                                                                                                                                                                                    • MiniLAB Classifying Materials
                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                    • Lab Comparing Pure Substances and Mixtures
                                                                                                                                                                                                                                                                                                                      • Section 2 Properties of Matter
                                                                                                                                                                                                                                                                                                                        • Integrate Environment
                                                                                                                                                                                                                                                                                                                        • MiniLAB Separating Ink
                                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                                        • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                        • Applying Math The Law of Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Measuring the Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Science Stats Intriguing Elements
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Study Guide
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Review
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                            • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                              • Launch Lab Inferring What You Cant Observe
                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                              • Section 1 Structure of the Atom
                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling an Aluminum Atom
                                                                                                                                                                                                                                                                                                                                • Visualizing The Atomic Model
                                                                                                                                                                                                                                                                                                                                  • Section 2 Masses of Atoms
                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                    • Applying Science How can radioactive isotopes help tell time
                                                                                                                                                                                                                                                                                                                                      • Section 3 The Periodic Table
                                                                                                                                                                                                                                                                                                                                        • MiniLAB Organizing a Personal Periodic Table
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Career
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                                                                                                                                                                        • Lab A Periodic Table of Foods
                                                                                                                                                                                                                                                                                                                                        • Lab Use the Internet Whats in a name
                                                                                                                                                                                                                                                                                                                                        • Science and History A Chilling Story
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Study Guide
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Review
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                            • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                              • Launch Lab Earth Materials at Home and School
                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                              • Section 1 Minerals
                                                                                                                                                                                                                                                                                                                                                • MiniLAB Identifying Salts Crystal System
                                                                                                                                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                • Lab Be a Mineral Detective
                                                                                                                                                                                                                                                                                                                                                  • Section 2 Igneous Rocks
                                                                                                                                                                                                                                                                                                                                                    • Applying Math Extrusive Igneous Rock Classification
                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                      • Section 3 Sedimentary Rocks
                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Evaporites
                                                                                                                                                                                                                                                                                                                                                          • Section 4 Metamorphic Rocks and the Rock Cycle
                                                                                                                                                                                                                                                                                                                                                            • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                            • Visualizing Shock Metamorphic Rock
                                                                                                                                                                                                                                                                                                                                                            • Lab Identifying Rocks
                                                                                                                                                                                                                                                                                                                                                            • Science and Society Earth Materials at Work
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Study Guide
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Review
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                  • Launch Lab Have you got the time
                                                                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                                                                  • Section 1 Weathering and Soil
                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing a Disappearing Seasoning
                                                                                                                                                                                                                                                                                                                                                                    • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                    • Lab Graphing Soil Textures
                                                                                                                                                                                                                                                                                                                                                                      • Section 2 Shaping the Landscape
                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Runoff
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                          • Section 3 Groundwater
                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Porosity Volume
                                                                                                                                                                                                                                                                                                                                                                            • Visualizing The Role of Groundwater in Shaping Earths Surface
                                                                                                                                                                                                                                                                                                                                                                            • Integrate Environment
                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                              • Section 4 Geologic Time
                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                                                                                                • Lab Its about time - relative that is
                                                                                                                                                                                                                                                                                                                                                                                • Science and Society Tapping into the Underground
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Review
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                      • Unit 6 Interactions of Matter
                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                          • Lab Chemical Bonds and Mixing
                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Stability in Bonding
                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                            • Lab Atomic Trading Cards
                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Types of Bonds
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Observing a Bond Type
                                                                                                                                                                                                                                                                                                                                                                                                • Visualizing Polar Molecules
                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Writing Formulas and Naming Compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math Determining a Formula
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Science Can you name binary ionic compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Making a Hydrate
                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Model and Invent - Modeling Chemical Bonding
                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Sticky Subject
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Review
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab RustingmdashA Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Chemical Changes
                                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Designing a Team Equation
                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Chemical Equations
                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math Barium Sulfate Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Classifying Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 4 Reaction Rates and Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing Chemical Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Creating a Colorful Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab To Glow or Not to Glow
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Investigating Reaction Conditions
                                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Clumsy Move Pays Off
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Review
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab Magic Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 How Solutions Form
                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                                                                                                                                                                                                                                                            • Visualizing Metal Alloys
                                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Observing the Effect of Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Solubility and Concentration
                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Acids Bases and Salts
                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing Acid Relief
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Strength of Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Determining Acidity
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Saturated Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and Society Acid Rain
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab The Size of a Nucleus
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Strong Force
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Nuclear Decay
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Detecting Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math The Age of Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Social Studies
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Page 3: 706 S1 318-326 GPS09 - Light-and-Sound - home · PDF fileWhat sound does a ruler make? ... sound waves cannot travel in empty space where there are no particles. ... sound travels

320 CHAPTER 11 Sound and Light

Sound WavesAn amusement park can be a noisy place With all the racket

of carousel music and booming loudspeakers it can be hard tohear what your friends say The many sounds you hear every dayare different but they do have something in commonmdasheachsound is produced by an object that vibrates

Making Sound Waves When an object like the tuning forkin Figure 1 vibrates it creates sound waves Sound waves arecompressional waves Recall that a compressional wave is made ofcompressions and rarefactions When an end of the tuning forkmoves outward it forms a compression on that side by pushingthe molecules in air together The compression moves away fromthe tuning fork as these molecules collide with other molecules inair When the end of the tuning fork moves back a rarefaction isformed where the molecules are farther apart As the tuning forkvibrates it produces a series of compressions and rarefactions thattravels outward This series of compressions and rarefactions isthe sound wave that you hear

The Speed of SoundA sound wave moves in air as collisions between the mole-

cules in air transfer energy from place to place Sound waves alsocan move in other materials The material in which a sound wavemoves is called a medium Just as in air sound waves travel insolids liquids and other gases as a vibrating object transfersenergy to the particles in the material However sound wavescannot travel in empty space where there are no particles

Sound

Figure 1 A vibrating tuning fork

produces compressions and rarefac-

tions that travel outward from the

tuning fork These compressions

and rarefactions form a sound

wave

Reading Guide

Explain how sound travels

through different mediums Explain different properties of

sound Discuss the Doppler effect Identify ways sound can be used

Sounds are one way that you learn

about the world around you

Review Vocabulary

vibration rhythmic back-and-forth

motion

New Vocabulary

bull intensity

bull loudness

bull decibel

bull pitch

bull Doppler effect

Compression

Rarefaction

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SECTION 1 Sound 321

The Speed of Sound in Different Materials The speedof a sound wave in a medium depends on the type of substanceand whether it is a solid liquid or gas For example Table 1

shows the speed of sound in different mediums at room temper-ature In general sound travels slowest in gases and fastest insolids

Temperature and the Speed of Sound The speed ofsound waves also depends on the temperature of the mediumAs the temperature of a substance increases its atoms andmolecules move faster At a higher temperature atoms andmolecules collide with each other more frequently As a resultsound waves move faster For example in air at a temperature of0C sound travels at a speed of 331 ms but in air at a temper-ature of 20C sound travels at 343 ms

Amplitude and Energy of Sound WavesThink about the differences among sounds you hear Some

are loud others are soft The flute plays high notes whereas thetuba is much lower What properties of sound waves cause thesedifferences in the sounds you hear

Recall that the amount of energy a wave carries correspondsto its amplitude For a compressional wave amplitude is relatedto the density of the particles in the compressions and rarefac-tions A vibrating object makes a wave by transferring energy tothe medium More energy is transferred to the medium whenthe particles of the medium are forced closer together in thecompressions and spread farther apart in the rarefactions Lookat Figure 2 A sound wave has a higher amplitude and carriesmore energy when particles in the medium are closer togetherin the compressions and more spread out in the rarefactions

Compression Rarefaction

Low-amplitude sound wave

Compression Rarefaction

High-amplitude sound wave

Figure 2 The amplitude of a

sound wave depends on the density

of the particles in the compressions

and rarefactions

In a high-amplitude sound wave

particles are tightly packed in the

compressions and far apart in the

rarefactions

In a low-amplitude sound wave

particles are less tightly packed in

the compressions and not as far

apart in the rarefactions

Table 1 Speed of Soundin Different Mediums

Medium Speed of Sound (ms)

Air (20degC) 343

Cork 500

Water 1498

Brick 3650

Aluminum 5000

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Intensity and LoudnessImagine you are listening to music from your CD player

Sound waves produced by the CD player travel through the airand transfer energy from the CD player to your ears The energythat reaches your ears depends not only on the amplitude of thesound waves but also on how close you are to the CD playerFigure 3 shows that as you get farther from a source of soundthe energy of the sound waves is spread over a greater area Theamount of energy transferred by a sound wave through a certainarea each second is the intensity of the sound wave As soundwaves travel away from the source of the sound the intensity ofthe waves decreases as the waves spread out This means that asyou get farther from the source less energy reaches your earseach second

Loudness When you hear different sounds you do not needspecial equipment to know which sounds have greater intensityYour ears and brain can tell the difference Loudness is thehuman perception of sound intensity As the intensity of asound wave increases the loudness of the sound also increases

How are intensity and loudness related

A Scale for Sound Intensity The intensity of sound can bedescribed using a measurement scale Each unit on the scale forsound intensity is called a decibel abbreviated dB On this scalethe faintest sound that most people can hear is 0 dB Soundswith intensity levels above 120 dB may cause pain and perma-nent hearing loss During some rock concerts sounds reach thisdamaging intensity level Wearing ear protection such asearplugs around loud sounds can help protect against hearingloss Figure 4 shows some sounds and their intensity levels indecibels

Figure 4 The decibel scale meas-

ures the intensity of sound

Identify where a normal speakingvoice would fall on the scale

Figure 3 The intensity of a

sound wave decreases as the wave

spreads out from the source of the

sound The energy of the wave is

spread over a larger area as the

wave spreads out

Whisper

Rustling

leaves

Noisy

restaurant

20 25 50 75 80 100 110 12015

Purring

cat

Average

home

Vacuum

cleaner

Jet plane

taking off

Power

mowerPain

threshold

0dB 150

Loudness in Decibels

322 CHAPTER 11 Sound and Light

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SECTION 1 Sound 323

Pitch and FrequencyYou might be familiar with the music

scale do re mi fa sol la ti do shown inFigure 5 If you were to sing this scale youwould hear the pitch of your voice gethigher Pitch is the human perception ofthe frequency of sound waves Pitch getshigher as the frequency of the sound wavesincreases

Frequency Frequency is a measure of how many wavelengthspass a particular point each second For a compressional wavesuch as sound the frequency is the number of compressions orthe number of rarefactions that pass by each second Frequencyis measured in hertz (Hz) A frequency of 1 Hz means that onecomplete wavelength passes by in 1 s

A healthy human ear can hear sound waves with frequenciesfrom about 20 Hz to 20000 Hz The human ear is most sensi-tive to sounds in the range of 440 Hz to about 7000 Hz In thisrange most people can hear much fainter sounds than they canat higher or lower frequencies

Ultrasonic and Infrasonic Waves Most people canrsquot hearsound frequencies above 20000 Hz which are called ultrasonicwaves Dogs can hear sounds with frequencies up to about35000 Hz and bats can detect frequencies higher than 100000Hz Even though humans canrsquot hear ultrasonic waves they havea number of uses For example ultrasonic waves directed intothe human body are used in medical diagnosis and treatmentUltrasonic waves are reflected by objects underwater and can beused to determine the size shape and depth of underwaterobjects

Infrasonic or subsonic waves have frequencies below20 Hzmdashtoo low for most people to hear These waves are pro-duced by sources that vibrate slowly such as wind heavymachinery and earthquakes Although you canrsquot hear infrasonicwaves you might feel them as a rumble inside your body

The Doppler EffectImagine that you are standing at the side of a racetrack with

race cars zooming past As they move toward you the pitches oftheir engines become higher As they move away the pitchesbecome lower The change in pitch or frequency due to therelative motion of a wave source is called the Doppler effect

Figure 5 Every note has a

different frequency which gives it

a distinct pitch

Describe how pitch changes whenfrequency increases

C

do

262

Hz

D

re

294

Hz

E

mi

330

Hz

F

fa

349

Hz

G

sol

392

Hz

A

la

440

Hz

B

ti

494

Hz

C

do

523

Hz

Comparing IntensityProcedure 1 Complete the safety form

2 Tie the middle of a 50-cm

length of string to a metal

object such as a spoon3 Wrap each end of the

string around a finger on

each hand Place one of

these fingers in each ear

4 Swing the object so it

bumps against a table or

a chair Note the sound

5 Take your fingers out of

your ears and repeat

step 4

Analysis1 Compare the sounds you

heard in both trials

2 Compare the intensity of

the sound waves that

reached your

ears in both

trials

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324 CHAPTER 11 Sound and Light

A Moving Source of Sound As a race car moves it producessound waves in the form of compressions and rarefactions InFigure 6A the race car creates a compression labeled ACompression A moves through the air toward the flagger By thetime compression B leaves the race car in Figure 6B the car hasmoved forward Because the car has moved since the time it createdcompression A compressions A and B are closer together in frontof the car than they would be if the car had stayed still Because thecompressions are closer together more compressions pass by theflagger each second than if the car had been at rest As a result theflagger hears a higher pitch Figure 6B also shows that the compres-sions behind the moving car are farther apart resulting in a lowerfrequency The flagger hears a lower pitch after the car passes

A Moving Listener You also can hear the Doppler effect whenyou are moving past a sound source that is standing still Supposeyou were riding in a school bus and passed a building with a ring-ing bell The pitch would become higher as you approached thebuilding and lower as you rode away from it The Doppler effecthappens any time the source of a sound is changing position rel-ative to the listener It occurs no matter whether it is the soundsource or the listener that is moving The faster the change inposition the greater the change in frequency and pitch

How does pitch change if you are moving awayfrom a sound source

The race car creates compression A which

spreads through the air in all directions from the

point where it was created

The car is closer to the flagger when it creates

compression B Compressions A and B are closer

together in front of the car so the flagger hears a

higher-pitched sound

Figure 6 The Doppler effect occurs when the

source of a sound wave is moving relative to a

listener

Compression A

Compression B

Compression A

Red Shift The Dopplereffect can also beobserved in light wavesemanating from movingsourcesmdashalthough thesources must be movingat tremendous speedsAstronomers have learnedthat the universe isexpanding by observingthe Doppler effect in lightwaves Research thephenomenon known asred shift and explain inyour Science Journal howit relates to the Dopplereffect

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SECTION 1 Sound 325

Using SoundWhen sound waves strike an object they can be absorbed by

the object transmitted through the object or reflected from theobject By detecting the sound waves reflected from an objectthe size shape and location of an object can be determined

Echolocation and Sonar Some species of bats as well asdolphins whales and other animals use sound waves to detecttheir prey Echolocation is the process of locating objects byemitting sounds and detecting the sound waves that reflect back

Sonar is a system that uses the reflection of underwater soundwaves to detect objects First a sound pulse is emitted underwa-ter The sound waves travel in the water and are reflected whenthey strike an object such as a fish or a ship An underwatermicrophone detects the reflected waves Because the speed ofsound in water is known the distance to the object can be calcu-lated by measuring how much time passes between when thesound pulse is emitted and when the reflected signal is received

USING SONAR A sonar pulse returns in 300 s from a sunken ship that is directly below Find

the depth of the ship if the speed of the pulse is 1500 ms Hint The sonar pulse travels a

distance equal to twice the depth of the ship so use the equation d = st2 to find the depth

known values and the unknown value

Identify the known values

speed of sound in water s 1500 ms

time for round trip t 300 s

Identify the unknown value

depth of the ship d m

the problem

Substitute the known values s 1500 ms and t 300 s into the equation for depth

d s2t

(1500 m2s)(300 s)

12

(4500 m) 2250 m

your answer

Check your answer by dividing the distance by the time and multiplying by 2 The result

should be the speed of sound given in the problem

CHECK

SOLVE

means

means

means

IDENTIFY

Solve a Simple Equation

Find the speed of a sonar pulse that returns in 20 s from a ship at a depth of 1500 m

For more practice problems go to page 879 and visit Math Practice at gpesciencecom

Topic SonarVisit for Web

links to information about ways

sonar is used

Activity Research to find out

the different types of sonar Make

a poster that describes active and

passive sonar

gpesciencecom

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326 CHAPTER 11 Sound and Light

Self Check

1 Explain how sound travels from your vocal cords to

your friendrsquos ears when you talk

2 Explain how the loudness of a sound wave depends on

the intensity of the sound wave

3 Draw and label a diagram that explains the Doppler

effect

4 Describe at least three uses of ultrasonic technology in

medicine

5 Think Critically How could sonar technology be used

to locate deposits of oil and minerals

Summary

Sound Waves

bull Sound waves are compressional waves that

are produced by vibrating objects

bull Sound usually travels fastest in solids and

slowest in gases

bull Sound travels faster as the temperature of

the medium increases

Properties of Sound

bull The amplitude of sound waves increases as

the density of particles increases in the com-

pressions and decreases in rarefactions

bull Loudness is the human perception of the

intensity of sound waves Pitch is the human

perception of the frequency of sound waves

bull The Doppler effect is the change in the fre-

quency of a sound wave when the source of

the sound is moving relative to a listener

6 Calculate Time How long would it take a sound

wave from a car alarm to travel 10 km in air if the air

temperature were 0degC

7 Calculate Distance If sound travels in the ocean with

a speed of 1500 ms how far will a sonar pulse travel

in 45 s

Ultrasound in Medicine High-frequency soundwaves can also be used to remove dirt buildup on jew-elry and glassware One of the most important uses ofultrasonic waves though is in medicine Using spe-cial instruments medical professionals can sendultrasonic waves into a specific part of a patientrsquosbody Reflected ultrasonic waves are used to examinedifferent body parts and to detect and monitor cer-tain types of heart disease and cancer Ultrasoundimaging also is used to monitor the development of afetus as shown in Figure 7 However ultrasound doesnot produce good images of the bones and lungsbecause hard tissues and air absorb the ultrasonicwaves instead of reflecting them

High-frequency sound waves can be used to treatcertain medical problems For example sometimes small harddeposits of calcium compounds or other minerals form in thekidneys making kidney stones In the past physicians had toperform surgery to remove kidney stones Now ultrasonic treat-ments are commonly used to break them up instead Bursts ofultrasound create vibrations that cause the stones to break intosmall pieces that can easily pass out of the body with the urineA similar treatment is available for gallstones

Figure 7 Ultrasonic waves are

directed into a pregnant womanrsquos

uterus to form images of her fetus

More Section Review gpesciencecom

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Opaque

Translucent

Transparent

SECTION 2 Reflection and Refraction of Light 327

The Interaction of Light and MatterLook around your darkened room at night You know that

some of the objects are brightly colored but they look gray orblack in the dim light Turn on the light and you can see all theobjects in the room clearly including their colors What you seedepends on the amount of light in the room and the color of theobjects For you to see an object it must reflect or emit somelight that reaches your eyes

Absorption Transmission and Reflection Objects canabsorb light reflect light and transmit lightmdashallow light to passthrough them The type of matter in an object determines theamount of light it absorbs reflects and transmits For examplethe opaque material in the top candleholder in Figure 8 onlyabsorbs and reflects lightmdashno light passes through it As a resultyou cannot see the candle inside Materials that allow some lightto pass through them like the material of the middle candle-holder in Figure 8 are described as translucent You cannot seeclearly through translucent materials

Transparent materials such as the bottom candleholder inFigure 8 transmit almost all the light striking them so you cansee objects clearly through them Only a small amount of lightis absorbed and reflected by transparent materials

Reflection andRefraction of Light

Reading Guide

Describe how light waves interact

with matter Explain the difference between

regular and diffuse reflection Define the index of refraction of a

material Explain why a prism separates

white light into different colors

The images you see every day are

due to the behavior of light waves

Review Vocabulary

visible light an electromagnetic

wave with wavelengths between

about 400 and 700 billionths of a

meter

New Vocabulary

bull opaque

bull translucent

bull transparent

bull index of refraction

Figure 8 These candleholders

interact with light differently

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328 CHAPTER 11 Sound and Light

Reflection of LightHave you glanced in a mir-

ror today You see your reflec-tion in the mirror when light isreflected off you strikes themirror and is reflected off themirror into your eye Becauselight behaves as a wave itobeys the law of reflection asshown in Figure 9 Recall thataccording to the law of reflec-tion the angle at which a lightwave strikes a surface is thesame as the angle at which it is

reflected Light reflected from any surfacemdasha mirror or a sheetof papermdashobeys this law

Regular and Diffuse Reflection Why can you see yourreflection in a store window but not in a sheet of paper Theanswer has to do with the smoothness of the surfaces A smootheven surface such as a pane of glass produces a sharp image byreflecting parallel light waves in only one direction Reflection oflight waves from a smooth surface is regular reflection To causea regular reflection the roughness of a surface must be less thanthe wavelengths it reflects A sheet of paper has an uneven sur-face that causes incoming parallel light waves to be reflected inmany directions as shown in Figure 10 Reflection of light froma rough surface is diffuse reflection

Scattering Diffuse reflection is a type of scattering thatoccurs when light waves traveling in one direction are made totravel in many different directions Scattering also occurs whenlight waves traveling through the air reflect off small particlesAn example is light scattering off the small water droplets thatmake up a cloud Scattering causes the cloud to appear whiteeven though the droplets are transparent

What is scattering of light

Figure 9 According to the law of

reflection light is reflected so that

the angle of incidence always

equals the angle of reflection

Figure 10 A sheet of paper

has an uneven surface that

produces a diffuse reflection

Explain Use the law ofreflection to explain why arough surface causes parallellight waves to be reflected inmany directions

Mirror

i = angle of

incidence

i

r

i

r

r = angle of

reflection

Normal

Normal

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Refraction of LightWhat occurs when a light wave passes from one material to

anothermdashfrom air to water for example Recall that refractionis caused by a change in the speed of a wave when it passes fromone material to another If the light wave is traveling at an angleto the boundary between the materials and the speed of light isdifferent in the two materials the wave will be bent or refracted

Why does refraction occur

The Index of Refraction The amount of bending that takesplace depends on the speeds of light in both materials Thegreater the change in speed the more the light will be bent asit passes at an angle from one material to the other Figure 11

shows an example of refraction Every material has an index ofrefraction which is the ratio of the speed of light in a vacuum tothe speed of light in the material The index of refraction indi-cates how much the speed of light is reduced in the materialcompared to its speed in empty space

The larger the index of refraction the more light is sloweddown in the material For example because glass has a largerindex of refraction than air light moves more slowly in glassthan air The index of refraction is usually largest for solids andsmallest for gases

Prisms A sparkling glass prism hangs in a sunny windowrefracting the sunlight and projecting a colorful pattern onto thewalls of the room How does the refraction of light create thesecolors The spectrum of colors is produced because the speed oflight in a material also depends on the wave-length of the light In a glass prism light waveswith longer wavelengths such as red light wavesare slowed less than light waves with shorterwavelengths such as blue light waves

Figure 12 shows what occurs when whitelight passes through a prism White light suchas sunlight is made up of light waves withrange of wavelengths from red to blue The tri-angular prism refracts the light twicemdashoncewhen it enters the prism and again when itleaves the prism and reenters the air Becausethe longer wavelengths of light are slowed lessthan the shorter wavelengths are red light isbent the least As a result of these differentamounts of bending the different colors areseparated when they emerge from the prism

Figure 11 The spoon looks

broken because light waves are

refracted as they change speed

when they pass from the water to

the air

329

Figure 12 Refraction causes a

prism to separate a beam of white

light into different colors

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330 CHAPTER 11 Sound and Light

Self Check

1 Compare and contrast opaque transparent and

translucent materials Give one example of each

2 Discuss why you can see your reflection in a smooth

piece of aluminum foil but not in a crumpled ball of foil

3 Infer what happens to light waves that are reflected off

dust particles in the air

4 Explain what happens to white light when it passes

through a prism

5 Think Critically Suppose a material has the same index

of refraction as water How would a light wave change

direction as it traveled from water into this material

Summary

Light and Matter

bull The amount of light that is absorbed

reflected or transmitted depends on the

material making up the object

Reflection of Light

bull Light waves always obey the law of reflection

the angle of incidence equals the angle of

reflection

bull Regular reflection causes parallel light waves

to be reflected in only one direction

bull Diffuse reflection causes parallel light waves

to be reflected in many directions

bull Scattering occurs when light waves are reflected

and travel in many different directions

Refraction of Light

bull Refraction occurs when a light wave changes

speed in moving from one material to another

bull The index of refraction of a material indicates

how much light slows down in the material

6 Find an Angle A light wave strikes a mirror at an

angle of 42deg from the surface of the mirror What

angle does the reflected wave make with the normal

7 Find an Angle A light wave reflects from a mirror at

27deg from the normal What was the angle between

the mirror and the incident wave

Mirages When yoursquore traveling in a car you might see whatlooks like a pool of water on the road ahead As you get closerthe water seems to disappear Yoursquove seen a miragemdashan image ofa distant object produced by the refraction of light through airlayers of different densities Mirages result when the air atground level is much warmer or cooler than the air above asshown in Figure 13 The density of air increases as air cools andlight waves move slower in cooler air than in warmer air As aresult light waves are refracted as they pass through air layerswith different temperatures

Figure 13 Mirages result when

air near the ground is much

warmer or cooler than the air

above This causes light waves

reflected from an object to refract

creating one or more additional

images

MirageWarm air

Cool air

More Section Review gpesciencecom

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SECTION 3 Mirrors Lenses and the Eye 331

Light RaysLight sources send out light waves in all directions These

waves spread out like ripples on the surface of water spread outfrom the point of impact of a pebble You can think of the lightcoming from the source as being many narrow beams of light trav-eling in all directions Each narrow light beam is called a light ray

MirrorsA mirror is any surface that produces a regular reflection A pool

of still water a metal pan and even the back of a shiny spoon can bemirrors Mirrors can be flat curved inward or curved outward

Plane Mirrors A flat smooth mirror is a plane mirror Whenyou look in a plane mirror your image appears upright If youstand 1 m from the mirror your image appears 1 m behind themirror or 2 m from you In fact your image is what a friend stand-ing 2 m from you would see Figure 14 shows how your image isformed First light rays from a light source strike you Every pointthat is struck by the light rays reflects these rays so they travel out-ward in all directions If your friend were looking at you thesereflected light rays coming from you would enter her eyes so shecould see you However if a mirror is placed between you and yourfriend light rays are reflected from the mirror back to your eyes

Mirrors Lenses andthe Eye

Reading Guide

Describe how images are formed

by three types of mirrors Explain how convex and concave

lenses form images Explain how the human eye

enables you to see Describe how lenses are used to

correct vision problems

Mirrors and lenses are used in optical

instruments such as cameras and

telescopes

Review Vocabulary

reflection the process of changing

direction after striking a surface

New Vocabulary

bull plane mirror

bull concave mirror

bull convex mirror

bull convex lens

bull concave lens

Figure 14 Seeing an image of

yourself in a mirror involves two

sets of reflections light rays are

reflected from you and then are

reflected by the mirror

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332 CHAPTER 11 Sound and Light

Virtual and Real Images The forma-tion of an image by a plane mirror isshown in Figure 15 Your brain assumesthat light rays travel in a straight line As aresult rays that enter your eyes seem tocome from behind the mirror This makesthe image seem to be behind the mirrorHowever no light rays actually passthrough the place where the image seemsto be located This type of image is called avirtual image Plane mirrors always formvirtual images If light rays from an objectpass through the location of the image theimage is called a real image Curved mir-rors can form both real and virtual images

Concave Mirrors If the surface of a mirror is curved inwardit is called a concave mirror as shown in Figure 16 The opticalaxis is an imaginary straight line drawn perpendicular to thesurface of the mirror at its center Every light ray traveling par-allel to the optical axis is reflected through a point on the opti-cal axis called the focal point The distance from the center ofthe mirror to the focal point is called the focal length

The image formed by a concave mirror depends on the loca-tion of the object relative to the focal point Figure 16 shows acandle located more than twice the focal length from the mirrorAlthough many light rays come from each point on the candleonly two rays from the same point are shown Ray A passesthrough the focal point and then reflects off the mirror movingparallel to the optical axis Ray B travels parallel to the opticalaxis before reflecting off the mirror and passing through thefocal point The point where the two rays meet is the location ofthe image of the original point on the candle The image formedis a real image because light rays from the candle pass throughthe place where the image is located

Figure 16 Rays A and B start from the same

place on the candle travel in different directions

and meet again on the reflected image

Diagram how two other points on the image ofthe candle are formed

Figure 15 Your brain interprets

the light rays reflected by the

mirror as coming from a point

behind the mirror

Infer how the size of your imagein a plane mirror depends on yourdistance from the mirror

Focalpoint

Optical axis

Ray B

Ray A

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SECTION 3 Mirrors Lenses and the Eye 333

Images Produced by a ConcaveMirror When an object is between oneand two focal lengths from a concavemirror the image is real inverted andlarger than the object An object closerthan one focal length from a concavemirror produces a virtual image that isupright and larger than the object Noimage is produced if the object islocated at the focal point

Convex Mirrors When you are in astore look up toward one of the backcorners or at the end of an aisle to see ifa large rounded mirror is mountedthere You can see a large area of the store in such a mirror Amirror that curves outward like the back of a spoon is called aconvex mirror Light rays that hit a convex mirror diverge orspread apart after they are reflected Figure 17 shows how therays from an object are reflected by a convex mirror to form animage The reflected rays diverge and never meet so a convexmirror forms only a virtual image The image also is upright andsmaller than the actual object is

Describe the image formed by a convex mirror

LensesWhat do your eyes have in common with cameras eyeglasses

and microscopes Each of these contains at least one lens A lens is atransparent object with at least one curved surface that causes lightrays to refract The image that a lens forms depends on the shape ofthe lens Like curved mirrors lenses can be convex or concave

Convex Lenses A convex lens is thicker in the middle than atthe edges Its optical axis is an imaginary straight line that is per-pendicular to the surface of the lens at its thickest point When lightrays approach a convex lens traveling parallel to its opticalaxis the rays are refracted toward the center of the lens asin Figure 18 Light rays traveling along the optical axis arenot bent at all All light rays traveling parallel to the opti-cal axis are refracted so they pass through a single pointwhich is the focal point of the lens The less curved thesides of the lens the less light rays are bent As a resultlenses with flatter sides have longer focal lengths Figure 19

on the next page shows that convex lenses can form eitherreal or virtual images

Figure 18 Convex lenses are

thicker in the middle than at the

edges Light rays that are parallel

to the optical axis are refracted so

that they pass through the focal

point A light ray that passes

through the center of the lens is

not refracted

Figure 17 A convex mirror

forms a reduced upright virtual

image

Optical axis

Ray A

Ray B

Focallength

Focalpoint

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Figure 19

VISUALIZING IMAGES FORMED BY A CONVEX LENS

334 CHAPTER 11 Sound and Light

Aconvex lens can form images that are real or virtual enlarged or reduced and upright orinverted Just as for a concave mirror the type of image formed by a convex lens depends on thelocation of the object relative to the focal point of the lens

Optical axis

One

focal

length

Two

focal

lengthsRay B

Image

Ray A

Object

Focal

point

Optical axis

One

focal

length

Two

focal

lengths

Ray B

Ray AObject

Image

Focal

point

Optical axis

Ray B

ObjectRay A

One

focal

length

Focal

pointImage

If the object is more than two focal lengths from the lens the image formed is real inverted andsmaller than the object As the object moves farther from the lens the image becomes smaller

If the object is between one and two focal lengths from the lens the image formed is real invertedand larger than the object As the object moves closer to the focal point the image becomes larger

If the object is less than one focal length from the lens the image is virtual upright and larger thanthe object The image is virtual because the light rays from the object diverge after they pass throughthe lens The image becomes smaller as the object moves closer to the lens

SECTION 3 Mirrors Lenses and the Eye 335

Concave Lenses A concave lens is thinnerin the middle and thicker at the edges Asshown in Figure 20 light rays that passthrough a concave lens bend away from theoptical axis The rays spread out and nevermeet so a real image is never formed Theimage is always virtual upright and smallerthan the object is Concave lenses are used insome types of eyeglasses and some telescopesConcave lenses usually are used in combinationwith other lenses

What type of image is formed by a concave lens

The Human EyeWhat determines how well you can see the words on this

page If you donrsquot need eyeglasses the structure of your eye givesyou the ability to focus on these words and other objects aroundyou Look at Figure 21 Light enters your eye through a trans-parent covering on your eyeball called the cornea The corneacauses light rays to bend so that they converge The light thenpasses through an opening called the pupil Behind the pupil isa flexible convex lens Muscles attached to the lens change itsshape to help focus light forming a sharp image on your retina

The retina is the inner lining of your eye The retina con-tains light-sensitive cells that convert an image into electricalsignals These signals then are carried along the optic nerve toyour brain to be interpreted With this complex structurethe human eye is capable of seeing clearly in bright and dimconditions focusing on both near and far objects and alsodetecting colors

Figure 20 A concave lens

refracts light rays so they spread

out away from the optical axis

Classify Is a concave lens mostlike a concave mirror or a convexmirror

Optical axis

Retina

Focalpoint

Pupil

Cornea

Lens

Optic nerve

Figure 21 The cornea and lens in your eye

bend light rays so that a sharp image is

formed on the retina

Eye Doctors Optometristsand ophthalmologists treatmany different eye prob-lems They often useadvanced technology todiagnose and correct mal-functioning parts of theeye Research an eye prob-lem and how it is treatedWrite a paragraph describ-ing what parts of the eyeare affected by the problemand how doctors correct it

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336 CHAPTER 11 Sound and Light

Brightness and Intensity The human eye can adjust to thebrightness of the light that strikes it If you step outside on asunny day you may have to shade your eyes against the intensityof the sunlight Light intensity is the amount of light energy thatstrikes a certain area each second Brightness is the human per-ception of light intensity Sunlight seems bright because a largeamount of light energy strikes your retina each second Youreyes respond to bright light by decreasing the size of your pupilThis reduces the amount of light that enters your eye and strikesthe retina

Intensity depends on your distance from a light source Ifyou move away from a bare lightbulb you can see how theintensity of the light rapidly decreases Because light rays spreadout from the source less light energy strikes your retina thefarther away you are from the bulb

Correcting Vision ProblemsIf you have good vision you should be able to see objects

clearly when they are 25 cm or farther away from your eyes Asharp image of an object should be formed on your retinaHowever for many people the image is blurry or formed in thewrong place causing vision problems

Farsightedness If you can see distant objects clearly butcanrsquot bring nearby objects into focus then you are farsighted Inthis case the eyeball might be too short or the lens isnrsquot curvedenough to form a sharp image of nearby objects on the retinaas shown in Figure 22 To correct the problem convex lensescan be used to bend incoming light rays so they converge beforethey enter the eye

Experimenting withFocal LengthsProcedure1 Complete the safety form

2 Fill a glass test tube with

water and seal it with a

lid or stopper3 Type or print SULFUR

DIOXIDE in capital letters

on a piece of paper4 Set the test tube horizon-

tally over the words

Record your observations

5 Hold the tube at several

heights above the words

Record your observations

Analysis1 Describe how the words

changed as the height of

the test tube increased

2 Classify the image at each

height as real or virtual

Focal

point

Correctedfarsighted eye

Light fromnearby object

Focalpoint

Light fromnearby object

Farsighted eye

The focal length of a farsighted eye is too long to form

a sharp image of nearby objects on the retina

A convex lens in front of a farsighted eye enables a sharp

image of nearby objects to be formed on the retina

Figure 22 Farsightedness can

be corrected by convex lenses

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SECTION 3 Mirrors Lenses and the Eye 337

Self Check

1 Diagram how light rays from an object are reflected by

a convex mirror to form an image

2 Infer how the size of the image changes if an object

that is less than one focal length from a concave mirror

moves closer to the mirror

3 Explain how the focal length of a convex lens changes

as the sides of the lens become less curved

4 Compare the image of an object less than one focal

length from a convex lens with the image of an object

more than two focal lengths from the lens

5 Think Critically Describe the image formed by a light

source placed at the focal point of a convex lens

Summary

Mirrors

bull A plane mirror forms upright virtual images

bull The image formed by a concave mirror

depends on the location of the object relative

to the focal point

bull Convex mirrors always produce virtual upright

images that are smaller than the object

Lenses

bull The image formed by a convex lens depends

on the distance of the object from the lens

bull Concave lenses always form virtual upright

images that are smaller than the object

The Eye and Vision

bull The eye contains a lens that changes shape to

produce sharp images on the retina

bull Farsightedness occurs when the eye cannot

form a sharp image of nearby objects

Nearsightedness occurs when the eye cannot

form sharp images of distant objects

6 Calculate Object Distance If you looked through a

convex lens with a focal length of 15 cm and saw a

real inverted enlarged image what is the maximum

distance between the lens and the object

Nearsightedness If you have nearsighted friends you knowthat they can see only nearby objects clearly Their eyes cannotform a sharp image on the retina of an object that is far awayInstead the image is formed in front of the retina as shown inFigure 23 To correct this problem a nearsighted person canwear concave lenses Figure 23 shows how a concave lens causesincoming light rays from distant objects to diverge before theyreach the eye Then the rays can be focused by the eye to form asharp image on the retina

Figure 23 Nearsightedness can

be corrected with concave lenses

Focalpoint

Light fromdistant object

Nearsighted eye

Focalpoint

Light fromdistant object

Correctednearsighted eye

When a nearsighted person looks at distant objects a

sharp image is formed in front of the retina

A concave lens in front of a nearsighted eye makes light

rays diverge so a sharp image is formed on the retina

More Section Review gpesciencecom

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How can you see the back of your head You

can use two mirrors to view a reflection of a

reflection of the back of your head

Real-World ProblemHow many images are seen in two mirrors

Goal Infer how the number of images depends

on the angle between two mirrors

Materialsplane mirrors (2) protractor

masking tape paper clip

Safety Precautions

Handle glass mirrors and paper clips carefully

Procedure1 Complete the safety form

2 Lay one mirror on top of the other with the

mirror surfaces together Tape together one

side so they can open and close Use tape to

label them L and R for left and right

3 Open the mirrors and stand them on a sheet

of paper at an angle of 72deg

4 Bend one leg of a paper clip up 90deg and

place it close to the front of the R mirror

5 Count the number of images of the paper

clip you see in the R and L mirrors Record

these numbers in your data table

6 The mirrors create an image of a circle

divided into wedges Record the number

of wedges

7 Hold the R mirror still and slowly move the Lmirror to 90deg Record the numbers of images

of the clip and wedges in the circle Repeat

this time opening the mirrors to 120deg

Conclude and Apply1 Infer the relationship between the number

of wedges and paper clip images

2 Determine the angle that would divide a

circle into six wedges Hypothesize how

many images would be produced Test your

hypothesis

Reflections of Reflections

Demonstrate for younger students the

relationship between the angle of the

mirrors and the number of reflections

338 CHAPTER 11 Sound and Light

Angle

Number of Number

of Mirrors Paper Clip Images

of Wedges R L

72ordm

90ordm

120ordm

Images and Wedges Seen in the Mirrors

Do not write in this book

SECTION 4 Light and Color 339

Why Objects Have ColorWhy do some apples appear red while others look green or

yellow An objectrsquos color depends on the wavelengths of light itreflects Recall that white light is a blend of all colors of visiblelight When a red apple is struck by white light it reflects redlight back to your eyes and absorbs all of the other colorsFigure 24 shows white light striking a green leaf Only the wave-lengths corresponding to green light are reflected to your eyes

Although some objects appear to be black black isnrsquot acolor Black is the absence of visible light Objects that appearblack absorb all colors of light and reflect little or no light backto your eyes White objects appear to be white because theyreflect all colors of visible light

Why does a white object appear white

Colored Filters Wearing tinted glasses changesthe color of almost everything you see If the lensesare yellow the world takes on a golden glow If theyare rose colored everything looks rosy Somethingsimilar would occur if you placed a colored clearplastic sheet over this white page The paper wouldappear to be the same color as the plastic The plasticsheet and the tinted lenses are filters A filter is atransparent material that transmits one or more col-ors of light but absorbs all others The color of a fil-ter is the color of the light that it transmits

Light and Color

Reading Guide

Explain how you see color Describe the difference between

light color and pigment color Predict what happens when dif-

ferent colors are mixed

From traffic lights to great works of

art color is an important part of your

world

Review Vocabulary

retina inner layer of the eye con-

taining cells that convert light

images into electrical signals

New Vocabulary

bull pigment

Figure 24 This leaf absorbs all

wavelengths of visible light except

the wavelengths you see as green

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340 CHAPTER 11 Sound and Light

Looking Through Colored Filters Figure 25 shows howthe color of an object can change when you look at it throughvarious colored filters The cooler looks blue under white lightbecause it reflects only the wavelengths of blue light that strikeit If you look at the cooler through a blue filter the cooler stilllooks blue because the blue filter transmits the reflected bluelight However if you look at the cooler through a red filter thecooler seems black because the red filter blocks the blue lightreflected by the cooler

Why does a blue object appear black whenviewed through a red filter

Seeing ColorAs you approach a busy intersection the color of the traffic

light changes from green to yellow to red On the cross street thecolor changes from red to green At a busy intersection trafficsafety depends on your ability to detect color changes rapidlyHow do you see colors

Light and the Eye In a healthy eye light enters the eyethrough the cornea is focused by the lens and finally forms animage on the retina The retina is made up of two types of cellsthat absorb light as shown in Figure 26 When these cellsabsorb light energy chemical reactions convert light energy intonerve impulses that are transmitted to the brain One type ofcell in the retina called a cone enables you to distinguish colorsand detailed shapes of objects Cones need bright light to gener-ate nerve impulses so they do not operate in dim light As aresult even brightly colored objects might look gray or black indim light

Figure 25 The color of this

cooler changes when viewed

through different color filters

Topic Color BlindnessVisit for Web

links to information about the

causes of color blindness

Activity Research the causes

and types of color blindness Find

out how cones are related to the

ability to distinguish colors

gpesciencecom

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SECTION 4 Light and Color 341

Cones and Rods Your eyes have three types of cones each ofwhich responds to a different range of wavelengths Red conesrespond to mostly red and yellow light Green cones respond tomostly yellow and green light Blue cones respond to mostlyblue and violet light The second type of cell in the retina calleda rod is sensitive to dim light and enables you to see at nightHowever rod cells do not enable you to see colors

Interpreting Color Why does a bananalook yellow The light reflected by the

banana causes the cone cells that are sensitive to red and greenlight to send signals to your brain Your brain could get the samesignal if a mixture of red light and green light reached your eyesThis mixture also would cause your red and green cones torespond and you would see the color yellow As a result lightwith wavelengths corresponding to yellow light and light that isa mixture of red and green light both cause the color yellow tobe seen What happens when you look at a white shirt You seewhite when all wavelengths of visible light enters your eyes Thenall three sets of cones cells send signals to the brain The com-bination of these signals cause you to see the shirt as white

Color Blindness If one or more of your sets of cone cellsdo not function properly you might not be able to distinguishcertain colors This condition is called color blindness orcolor deficiency About eight percent of men and one-halfpercent of women have some form of color blindness Themost common form of color blindness makes it difficult todistinguish between red and green Figure 27 shows an imagethat is used in a test for redndashgreen color blindness Becausered and green are used in traffic signals drivers and pedestri-ans must be able to identify them

Retina

Rod

Cone

Lens

Figure 27 Color blindness is an

inherited sex-linked condition in

which certain sets of cones in the

retina do not function properly

Identify the number that you seein the dots

Figure 26 Light enters the eye

and focuses on the retina The two

types of light-detecting cells

that make up the retina

are called rods and cones

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342 CHAPTER 11 Sound and Light

Mixing ColorsIf you have ever browsed through a paint store you have

probably seen displays where customers can select paint samplesof almost every imaginable color The colors are a result of mix-tures of pigments For example you might have mixed blue andyellow paint to produce green paint A pigment is a coloredmaterial that is used to change the color of other substancesThe color of a pigment results from the different wavelengths oflight that the pigment reflects

Mixing Colored Lights From the glowing orange of a sun-set to the deep blue of a mountain lake all the colors you see canbe made by mixing three colors of light These three colorsmdashred green and bluemdashare the primary colors of light They cor-respond to the three different types of cones in the retina ofyour eye When mixed together in equal amounts they producewhite light as Figure 28 shows Mixing the primary colors indifferent proportions can produce the colors you see

What are the primary colors of light

Paint Pigments If you were to mix equal amounts of redgreen and blue paint would you get white paint If mixing col-ors of paint were like mixing colors of light you would but mix-ing paint is different Paints are made with pigments Pigmentsproduce color as a result of the wavelengths of light they reflectPaint pigments usually are made of chemical compounds suchas titanium oxide a bright white pigment and lead chromatewhich is used for painting yellow lines on highways

Figure 28 White light is pro-

duced when the three primary col-

ors of light are mixed in equal

amounts

Color for PhotosynthesisPlant pigments determinethe wavelengths oflight for photosynthesisLeaves usually look greenbecause of the pigmentchlorophyll Chlorophyllabsorbs most wave-lengths of visible lightexcept green which itreflects However not allplants are green Researchdifferent plant pigmentsto find out how they allowplant species to survive indiverse habitats

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SECTION 4 Light and Color 343

Self Check

1 Identity what colors are reflected and what colors are

absorbed if a white light shines on a red shirt

2 Discuss how the primary colors of light differ from the

primary pigment colors

3 Explain why a red apple would appear black if you

looked at it through a blue filter

4 Determine why a white fence appears to be white instead

of multicolored if all colors are present in white light

5 Think Critically Light reflected from an object passes

through a green filter then a red filter and finally a

blue filter What color will the object seem to be

Summary

Why Objects Have Color

bull The color of an object is determined by the

wavelengths of light it reflects

bull The color of a filter is the color of the light the

filter transmits

Seeing Color

bull Rod and cone cells are light-sensitive cells

found in the retina of the human eye

bull Rod cells are sensitive to dim light Cone cells

enable colors to be seen

bull There are three types of cone cells One type

responds to red light another to green light

and another to blue light

Mixing Colors

bull Red green and blue are the primary light

colors Any color of light can be created by

mixing these primary light colors

bull Any pigment color can be formed by mixing

the primary pigment colorsmdashmagenta cyan

and yellow

6 Use Percentages In the human eye there are about

120000000 rods If 90000000 rods trigger at once

what percentage of the total number of rods triggered

7 Convert Units The wavelengths of light are measured

in nanometers (nm) which equals 0000001 mm

Find the wavelength in mm of a light wave that has a

wavelength of 690 nm

Mixing Pigments You can make any pigment color by mixingdifferent amounts of the three primary pigmentsmdashmagenta(bluish red) cyan (greenish blue) and yellow In fact color print-ers use these pigments as well as black ink to make full-colorprints like the pages in this book A primary pigmentrsquos colordepends on the wavelengths of the light that it reflects Actuallypigments both absorb and reflect a range of colors in sending asingle color message to your eye For example in white lightyellow pigment appears yellow because it reflects red and greenlight but absorbs the other wavelengths of visible light The colorof a mixture of two primary pigments is determined by theprimary colors of light that both pigments reflect

Look at Figure 29 The area in the center where the colors alloverlap appears to be black because the three blended primarypigments absorb all the primary colors of light Recall that theprimary colors of light combine to produce white light They arecalled additive colors However when the primary pigment col-ors are combined they absorb all wavelengths of visible light andproduce black Because black results from the absence ofreflected light the primary pigments are called subtractive colors

Figure 29 The three primary

pigment colors appear to be black

when they are mixed

Describe how the primary pigmentcolors are similar to the primary col-ors of light

More Section Review gpesciencecom

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Design Your OwnDesign Your Own

344

Real-World ProblemWhat loud noises do you enjoy and which ones do you find annoying

Most people enjoy a music concert performed by their favorite artist or

the booming displays of fireworks on the Fourth of July Most people

enjoy these loud sounds for short periods of time However certain

other loud noises such as traffic sirens and loud talking can be

annoying Constant annoying noises are called noise pollution What

can be done to reduce noise pollution What types of barriers will best

block out noise pollution

Form a HypothesisBased on your experiences with loud noises form a hypothesis that

predicts the effectiveness of different types of barriers at blocking out

noise pollution

Test Your HypothesisMake a Plan

1 Complete the safety form

2 Decide what type of barriers or materials you will test

3 Describe exactly how you will use these materials

Goals Design an experiment

that tests the effective-

ness of various types of

barriers and materials

for blocking out noise

pollution

Test different types of

materials and barriers

to determine the best

noise blocks

Possible Materialsradio CD player horn

drum or other loud

noise source

shrubs trees concrete

walls brick walls stone

walls wooden fences

parked cars or hanging

laundry

sound meter

meterstick or metric tape

measure

Blocking NfisePollution

4 Identify the controls and variables you will use in your

experiment

5 List the steps you will use and describe each step precisely

6 Prepare a data table in your Science Journal to record your

measurements

7 Organize the steps of your experiment in logical order

Follow Your Plan

1 Ask your teacher to approve your plan and data table before

you start

2 Conduct your experiment as planned

3 Test each barrier two or three times

4 Record the results from each test in your data table in your Science Journal

Analyze Your Data1 Identify the barriers that most effectively reduced noise pollution

2 Identify the barriers that least effectively reduced noise pollution

3 Compare the effective barriers and identify common characteristics that might

explain why they reduced noise pollution

4 Compare the natural barriers you tested with the artificial barriers Which type

of barrier best reduced noise pollution

5 Compare the different types of materials the barriers were made of Which

type of material best reduced noise pollution

Conclude and Apply1 Evaluate whether your results support your hypothesis

2 Predict how your results would differ if you used a louder source of noise such

as a siren

3 Infer from your results how people living near a

busy street could reduce noise pollution

4 Identify major sources of noise pollution in or

near your home How could they be reduced

5 Research how noise pollution can be

unhealthy

LAB 345

Draw a poster illustrating how builders and

landscapers could use certain materials to

better insulate a home or office from excess

noise pollution

346 CHAPTER 11 Sound and Light

A Haiku GardenThe Four Seasons in Poems and Prints

by Stephen Addiss with Fumiko and Akira Yamamoto

Respond to the Reading1 How do the illustrations help the reader

better understand the poems2 What do you think is meant by the

word lingering in the Haiku about springsunlight

3 Linking Science and Writing Writeone haiku about summer and anotherabout fall In one poem use color tohelp you describe the season In theother use light or some property oflight to help describe the season

Research has deter-mined that there is a

connection between color and mood Warmcolors have longer wavelengths and can bemore stimulating Cool colors which haveshorter wavelengths tend to have a calmingor soothing effect on people Light and colorhave long been used as literary symbols Doesthe use of color change what you imaginewhen you read the haiku

UnderstandingLiteratureJapanese Haiku A haiku is a verse thatconsists of three lines and 17 syllables inthe Japanese language The first and thirdlines have five syllables each and themiddle line has seven syllables Why isimagination important in reading haiku

Lingering

in every pool of watermdash

spring sunlightIssa

Withered by winter

the sound of the windmdash

one-color worldBasho

Sound

1 Sound waves are compressional waves thattravel only in matter

2 The speed of sound in a material dependson the type of material as well as itstemperature

3 Loudness depends on a sound waversquos inten-sity Pitch depends on a sound waversquosfrequency

4 Sound waves are used in echolocationsonar and medical imaging

Reflection and Refractionof Light

1 Light can be absorbed reflected or trans-mitted by a material

2 When light waves are reflected theyobey the law of reflectionmdashthe angle ofincidence equals the angle of reflection

3 A light wave is refracted or bent whenit changes speed as it travels at an anglefrom one material to another

Mirrors Lenses andthe Eye

1 Plane mirrors form upright virtual images

2 Images formed by concave mirrors andconvex lenses depend on the location ofthe object relative to the focal point

3 Convex mirrors and concave lenses formvirtual upright images that are smallerthan the object

4 The lens in the human eye changes shape toproduce a sharp image on the retina

Light and Color

1 You see color when light is reflected offobjects and into your eyes

2 Cone cells in the retina are light-sensitivecells that enable you to distinguish colors

3 Red blue and green are the three primarycolors of light and can be mixed to form allother colors

4 The primary pigment colors are magentacyan and yellow

CHAPTER STUDY GUIDE 347

Use the Foldable you made at the beginningof the chapter to help you review sound and light

Interactive Tutor gpesciencecom

Complete each statement with the correctvocabulary word or phrase

1 A change in frequency due to a movingsound source is due to the

2 A flat smooth surface that reflects light andforms an image is a(n)

3 An object is if you can seethrough it clearly

4 The of a material indicates howmuch the speed of light in the materialchanges as light passes through

5 You can change the color of white paint byadding a(n) to it

6 A(n) is a reflecting surface thatcurves outward like the back of a spoon

7 The human perception of the intensity of asound wave is

Choose the word or phrase that best answerseach question

8 Which of the following best describes imageformation by a plane mirrorA) A real image is formed in front of the mirrorB) A real image is formed behind the mirrorC) A virtual image is formed in front of the

mirrorD) A virtual image is formed behind the mirror

9 For a sound with low pitch what else isalso always lowA) amplitude C) wavelengthB) frequency D) wave velocity

10 Which of the following occurs when asound source moves away from youA) The soundrsquos velocity decreasesB) The soundrsquos loudness increasesC) The soundrsquos frequency decreasesD) The soundrsquos frequency increases

Use the table below to answer question 11

11 Based on the data in the table abovewhich of the following would be the speedof sound in air at 30degCA) 3404 ms C) 3494 msB) 3464 ms D) 3534 ms

12 What happens to a light ray travelingparallel to the optical axis of a convexlens that passes through the lensA) It travels parallel to the optical axisB) It passes through the focal pointC) It is bent away from the optical axisD) It forms a virtual image

13 Light waves of which color are bent mostwhen passing through a prismA) blue C) violetB) red D) yellow

14 Which way does a concave lens bend lightA) toward its optical axisB) toward its centerC) toward its edgesD) toward its focal point

Speed of Sound in Air

Temp peed( s)

4

4

4

348 CHAPTER REVIEW

concave lens p 335concave mirror p 332convex lens p 333convex mirror p 333decibel p 322Doppler effect p 323index of refraction p 329intensity p 322

loudness p 322opaque p 327pigment p 342pitch p 323plane mirror p 331translucent p 327transparent p 327

Vocabulary PuzzleMaker gpesciencecom

Use the illustration below to answer question 15

15 Describe how the position of the candlechanged if the image of the candle movedaway from the focal point

16 Apply Acoustic scientists sometimes doresearch in rooms that absorb all soundwaves How could such a room be used tostudy how bats find their food

17 Compare White light passes through atranslucent pane of glass and shines on ashirt Both the translucent glass and theshirt appear green Compare the colors oflight that are absorbed and transmitted bythe glass and the shirt

18 Infer Most mammals including dogs andcats canrsquot see colors Infer how the retinaof a catrsquos eye might be different from theretina of a human eye

19 Determine whether a convex lens could forman image that is enlarged real and upright

20 Infer A car comes to a railroad crossingThe driver hears a trainrsquos whistle and itspitch becomes lower What can beassumed about how the train is moving

21 Compare and contrast the reflection of lightfrom a white wall with a rough surfacewith the reflection of light from a mirror

Optical axis

One

focal

length

Two

focal

lengths

Image

Ray A

Object

Focal

point

Interpreting Graphics 22 Infer why a convex mirror and a concavelens can never produce a real image

23 Predict what color a white shirt wouldappear to be if the light reflected from theshirt passed through a red filter and thenthrough a green filter

24 Explain why windows might begin to rattlewhen an airplane flies overhead

25 Communicate Some people enjoy usingsnowmobiles Others object to the noisethat they make Write a proposal for a pol-icy that seems fair to both groups for theuse of snowmobiles in a state park

CHAPTER REVIEW 349

Use the wave speed equation ν ƒλ to answer

questions 26 and 27

26 Calculate Frequency A sonar pulse has awavelength of 30 cm and a speed inwater of 1500 ms Find its frequency

27 Calculate Wavelength What is the wave-length of a sound wave with a fre-quency of 440 Hz if the speed of soundin air is 340 ms

28 Calculate Angle of Incidence A light ray isreflected from a mirror If the anglebetween the incident ray and thereflected ray is 136deg what is the angleof incidence

29 Determine Object Distance You hold anobject in front of a concave mirror witha focal length of 30 cm If you do notsee a reflected image how far from themirror is the object

30 Calculate Speed The speed of light in avacuum is 300000 kms If the index ofrefraction of water is 133 what is thespeed of light in water

More Chapter Review gpesciencecom

1 Which of the following describes the imageformed by a convex mirror

A enlarged

B inverted

C real

D virtual

Use the figure below to answer question 2

2 Which of the following describes a light raythat passes through the focal point andthen is reflected by the mirror

A It travels parallel to the optical axis

B It forms a real image

C It is reflected back through the focal point

D It forms a virtual image

3 Why does an apple look red

A It reflects red light

B It absorbs red light

C It reflects green and blue light

D It reflects all colors of light except red

Use the figure below to answer questions 4 and 5

4 When the primary colors of light are addedtogether what color appears in area H

A cyan

B magenta

C white

D yellow

5 When the primary colors of light are addedtogether what color appears in area G

A cyan

B magenta

C white

D yellow

6 Which of the following increases as the fre-quency of a sound increases

A amplitude

B intensity

C loudness

D pitch

Red Blue

Green

F

H

G K

Focal pointOptical axis

350 STANDARDIZED TEST PRACTICE

Record your answers on the answer sheet provided by your teacher or on a sheet of paper

STANDARDIZED TEST PRACTICE 351

7 Which of the following parts of the eyeenable you to see colors in bright light

A cone cells

B cornea

C lens

D rod cells

Use the graph below to answer questions 8 and 9

8 Determine how far in centimeters theimage is from the lens when the object is15 centimeters from the lens

9 How far in centimeters is the object fromthe lens when the image distance andobject distance are equal

10 A shirt has stripes that are black and whitein white light If green light shines on thisshirt what colors will the black and whitestripes be

11 If you are on a moving train what hap-pens to the pitch of a crossing bell as youapproach the crossing and then moveaway from the crossing

Use the figure below to answer question 12

12 Describe the vision problem show by thefigure and explain how this vision prob-lem can be corrected

13 Explain why the human eye can see colorsbetter in bright light than in dim light

Image Distance fora Convex Lens

Ima

ge

dis

tan

ce (

cm)

30

25

20

15

10

5 10 15 20 25 30

Object distance (cm)

Standardized Test Practice gpesciencecom

Note Units Read carefully and make note of the units used in

any measurement

  • Glencoe Physical Science with Earth Science
    • Student Edition Table of Contents
      • Unit 1 Science and Technology
        • Chapter 1 The Nature of Science
          • Launch Lab Understanding Measurements
          • Foldables
          • Section 1 The Methods of Science
            • Science Online
            • Integrate History
            • Integrate Earth Science
            • Science Online
              • Section 2 Standards of Measurement
                • Applying Math Centimeters
                • Integrate Earth Science
                • Science Online
                • MiniLAB Determining the Density of a Pencil
                • Visualizing SI Dimensions
                  • Section 3 Communicating with Graphs
                    • Applying Math Temperature
                    • MiniLAB Graphing Temperature Change
                    • Lab Whats my graph
                    • Lab Design Your Own - Developing a Measurement System
                    • Science and Language Arts Thinking in Pictures and Other Reports from My Life with Autism
                      • Chapter 1 Study Guide
                      • Chapter 1 Review
                      • Chapter 1 Standardized Test Practice
                        • Chapter 2 Science Technology and Society
                          • Lab Technology in Your Life
                          • Foldables
                          • Section 1 Science and Technology
                            • MiniLAB Researching the Past
                            • Visualizing Technology Supplying Basic Needs
                            • Science Online
                              • Section 2 Forces that Shape Technology
                                • MiniLAB Evaluating the Benefits and Consequences of Technology
                                • Integrate Environment
                                • Integrate History
                                • Applying Science What impact does the accident at Chernobyl have on the future of nuclear power
                                • Science Online
                                • Lab Who contributes CO2
                                  • Section 3 Developing Technology
                                    • Integrate Life Science
                                    • Integrate Career
                                    • Lab Model and Invent - Care Package
                                    • Oops Accidents in Science A Slippery Situation
                                      • Chapter 2 Study Guide
                                      • Chapter 2 Review
                                      • Chapter 2 Standardized Test Practice
                                          • Unit 2 Motion Forces and Energy
                                            • Chapter 3 Motion Acceleration and Forces
                                              • Launch Lab Compare Speeds
                                              • Foldables
                                              • Section 1 Describing Motion
                                                • MiniLAB Measuring Average Speed
                                                • Science Online
                                                • Applying Math Average Speed
                                                • Integrate Astronomy
                                                • Science Online
                                                  • Section 2 Acceleration
                                                    • Integrate History
                                                    • Visualizing Acceleration
                                                      • Section 3 Motion and Forces
                                                        • Science Online
                                                        • MiniLAB Comparing Friction
                                                        • Lab Force and Acceleration
                                                        • Lab Design Your Own - Comparing Motion from Different Forces
                                                        • Science and Language Arts A Brave and Startling Truth
                                                          • Chapter 3 Study Guide
                                                          • Chapter 3 Review
                                                          • Chapter 3 Standardized Test Practice
                                                            • Chapter 4 The Laws of Motion
                                                              • Launch Lab The Force of Gravity
                                                              • Foldables
                                                              • Section 1 The First Two Laws of Motion
                                                                • MiniLAB Observing Inertia
                                                                • Science Online
                                                                • Applying Math The Acceleration of a Sled Solve a Simple Equation
                                                                  • Section 2 Gravity
                                                                    • Science Online
                                                                    • Integrate Earth Science
                                                                    • MiniLAB Observing Centripetal Force
                                                                    • Lab Gravity and Air Resistance
                                                                      • Section 3 The Third Law of Motion
                                                                        • Integrate Career
                                                                        • Visualizing Rocket Motion
                                                                        • Applying Math The Momentum of a Sprinter
                                                                        • Lab The Momentum of Colliding Objects
                                                                        • Science and History Newton and the Plague
                                                                          • Chapter 4 Study Guide
                                                                          • Chapter 4 Review
                                                                          • Chapter 4 Standardized Test Practice
                                                                            • Chapter 5 Energy
                                                                              • Launch Lab Energy Conversions
                                                                              • Foldables
                                                                              • Section 1 The Nature of Energy
                                                                                • Science Online
                                                                                • Applying Math Kinetic Energy
                                                                                • MiniLAB Interpreting Data from a Slingshot
                                                                                • Integrate Language Arts
                                                                                • Applying Math Gravitational Potential Energy
                                                                                • Lab Bouncing Balls
                                                                                  • Section 2 Conservation of Energy
                                                                                    • Visualizing Energy Transformations
                                                                                    • Integrate Environment
                                                                                    • MiniLAB Transforming Energy in a Paper Clip
                                                                                    • Science Online
                                                                                    • Integrate Health
                                                                                    • Lab Design Your Own - Swinging Energy
                                                                                    • Science and History The Impossible Dream
                                                                                      • Chapter 5 Study Guide
                                                                                      • Chapter 5 Review
                                                                                      • Chapter 5 Standardized Test Practice
                                                                                        • Chapter 6 Work and Machines
                                                                                          • Launch Lab Doing Work with a Simple Machine
                                                                                          • Foldables
                                                                                          • Section 1 Work
                                                                                            • Integrate Language Arts
                                                                                            • Applying Math Work
                                                                                            • MiniLAB Calculating Your Work and Power
                                                                                            • Applying Math Power
                                                                                              • Section 2 Using Machines
                                                                                                • MiniLAB Machines Multiplying Force
                                                                                                • Science Online
                                                                                                • Integrate Chemistry
                                                                                                  • Section 3 Simple Machines
                                                                                                    • Integrate History
                                                                                                    • Visualizing Levers in the Human Body
                                                                                                    • Science Online
                                                                                                    • Lab Levers
                                                                                                    • Lab Model and Invent - Using Simple Machines
                                                                                                    • Science and Society The Science of Very Very Small
                                                                                                      • Chapter 6 Study Guide
                                                                                                      • Chapter 6 Review
                                                                                                      • Chapter 6 Standardized Test Practice
                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                          • Launch Lab Relative Sizes of Earth the Moon and the Sun
                                                                                                          • Foldables
                                                                                                          • Section 1 Earth in Space
                                                                                                            • Science Online
                                                                                                            • Integrate Physics
                                                                                                              • Section 2 Time and Seasons
                                                                                                                • MiniLAB Modeling the Suns Rays at Solstice
                                                                                                                • Lab Comparing the Angle of Sunlight to Intensity
                                                                                                                  • Section 3 Earths Moon
                                                                                                                    • Applying Math Tides
                                                                                                                    • MiniLAB Modeling Phases and Eclipses
                                                                                                                    • Integrate History
                                                                                                                    • Integrate History
                                                                                                                    • Science Online
                                                                                                                    • Visualizing Water on the Moon
                                                                                                                    • Lab Identifying the Moons Surface Features and Apollo Landing Sites
                                                                                                                    • Oops Accidents in Science Even Great Scientists Make Mistakes
                                                                                                                      • Chapter 7 Study Guide
                                                                                                                      • Chapter 7 Review
                                                                                                                      • Chapter 7 Standardized Test Practice
                                                                                                                        • Chapter 8 The Solar System
                                                                                                                          • Launch Lab The Size of the Solar System
                                                                                                                          • Foldables
                                                                                                                          • Section 1 Planet Motion
                                                                                                                            • Integrate History
                                                                                                                            • MiniLAB Plotting Retrograde Motion
                                                                                                                            • Integrate Physics
                                                                                                                            • Applying Math Heliocentric Longitude (HL)
                                                                                                                              • Section 2 The Inner Planets
                                                                                                                                • Science Online
                                                                                                                                • Integrate Chemistry
                                                                                                                                • Lab Interpreting Features of Marss Surface
                                                                                                                                  • Section 3 The Outer Planets
                                                                                                                                    • Integrate Language Arts
                                                                                                                                    • Visualizing What Galileo Saw
                                                                                                                                    • Science Online
                                                                                                                                    • MiniLAB Comparing Sizes of Outer and Inner Planets
                                                                                                                                      • Section 4 Life in the Solar System
                                                                                                                                        • Lab Design Your Own - Testing Unknown Soil Samples for Life
                                                                                                                                        • Science Stats Night Sky Wonders
                                                                                                                                          • Chapter 8 Study Guide
                                                                                                                                          • Chapter 8 Review
                                                                                                                                          • Chapter 8 Standardized Test Practice
                                                                                                                                              • Unit 3 Energy in Motion
                                                                                                                                                • Chapter 9 Heat and States of Matter
                                                                                                                                                  • Launch Lab Expansion of a Gas
                                                                                                                                                  • Foldables
                                                                                                                                                  • Section 1 Temperature and Thermal Energy
                                                                                                                                                    • Applying Math Converting to Celsius
                                                                                                                                                    • Science Online
                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                    • Applying Math Change in Thermal Energy
                                                                                                                                                      • Section 2 States of Matter
                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                        • Science Online
                                                                                                                                                        • MiniLAB Comparing States of Water
                                                                                                                                                          • Section 3 Transferring Thermal Energy
                                                                                                                                                            • MiniLAB Comparing Thermal Conductors
                                                                                                                                                            • Visualizing Convection Currents
                                                                                                                                                            • Lab Convection in Gases and Liquids
                                                                                                                                                              • Section 4 Using Thermal Energy
                                                                                                                                                                • Integrate History
                                                                                                                                                                • Science Online
                                                                                                                                                                • Lab Conduction in Gases
                                                                                                                                                                • Science Stats Surprising Thermal Energy
                                                                                                                                                                  • Chapter 9 Study Guide
                                                                                                                                                                  • Chapter 9 Review
                                                                                                                                                                  • Chapter 9 Standardized Test Practice
                                                                                                                                                                    • Chapter 10 Waves
                                                                                                                                                                      • Launch Lab How do waves transfer energy
                                                                                                                                                                      • Foldables
                                                                                                                                                                      • Section 1 The Nature of Waves
                                                                                                                                                                        • Visualizing Formation of Ocean Waves
                                                                                                                                                                        • Science Online
                                                                                                                                                                          • Section 2 Wave Properties
                                                                                                                                                                            • MiniLAB Observing Wavelength
                                                                                                                                                                            • Integrate Social Studies
                                                                                                                                                                            • Applying Math The Speed of Sound
                                                                                                                                                                            • Lab Wave Speed and Tension
                                                                                                                                                                              • Section 3 The Behavior of Waves
                                                                                                                                                                                • Science Online
                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                • MiniLAB Experimenting with Resonance
                                                                                                                                                                                • Lab Measuring Wave Properties
                                                                                                                                                                                • Science and History Making Waves
                                                                                                                                                                                  • Chapter 10 Study Guide
                                                                                                                                                                                  • Chapter 10 Review
                                                                                                                                                                                  • Chapter 10 Standardized Test Practice
                                                                                                                                                                                    • Chapter 11 Sound and Light
                                                                                                                                                                                      • Launch Lab What sound does a ruler make
                                                                                                                                                                                      • Foldables
                                                                                                                                                                                      • Section 1 Sound
                                                                                                                                                                                        • MiniLAB Comparing Intensity
                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                        • Science Online
                                                                                                                                                                                        • Applying Math Using Sonar
                                                                                                                                                                                          • Section 2 Reflection and Refraction of Light
                                                                                                                                                                                          • Section 3 Mirrors Lenses and the Eye
                                                                                                                                                                                            • Visualizing Images Formed by a Convex Lens
                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                            • MiniLAB Experimenting with Focal Lengths
                                                                                                                                                                                            • Lab Reflections of Reflections
                                                                                                                                                                                              • Section 4 Light and Color
                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Lab Design Your Own - Blocking Noise Pollution
                                                                                                                                                                                                • Science and Language Arts A Haiku Garden The Four Seasons in Poems and Print
                                                                                                                                                                                                  • Chapter 11 Study Guide
                                                                                                                                                                                                  • Chapter 11 Review
                                                                                                                                                                                                  • Chapter 11 Standardized Test Practice
                                                                                                                                                                                                    • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                      • Launch Lab Global Jigsaw Puzzle
                                                                                                                                                                                                      • Foldables
                                                                                                                                                                                                      • Section 1 Evolution of Earths Crust
                                                                                                                                                                                                        • Applying Math Spreading Distances
                                                                                                                                                                                                        • Integrate Physics
                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                          • Section 2 Earthquakes
                                                                                                                                                                                                            • MiniLAB Demonstrating Four Types of Stress
                                                                                                                                                                                                            • Visualizing Earthquake-Proof Buildings
                                                                                                                                                                                                              • Section 3 Earths Interior
                                                                                                                                                                                                              • Section 4 Volcanoes
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • MiniLAB Modeling Lava Viscosity
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                • Lab A Case for Pacific Plate Motion
                                                                                                                                                                                                                • Lab Earthquake Earthquake Wheres the earthquake
                                                                                                                                                                                                                • Science and History Volcano Weather
                                                                                                                                                                                                                  • Chapter 12 Study Guide
                                                                                                                                                                                                                  • Chapter 12 Review
                                                                                                                                                                                                                  • Chapter 12 Standardized Test Practice
                                                                                                                                                                                                                      • Unit 4 Forms of Energy
                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                          • Launch Lab Electric Circuits
                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                          • Section 1 Electric Charge
                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                            • Visualizing Lightning
                                                                                                                                                                                                                            • MiniLAB Investigate Charged Objects
                                                                                                                                                                                                                              • Section 2 Electric Current
                                                                                                                                                                                                                                • MiniLAB Investigating Battery Addition
                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                • Lab Identifying Conductors and Insulators
                                                                                                                                                                                                                                  • Section 3 Electrical Energy
                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                    • Applying Math Power Used by a Clothes Dryer
                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                    • Applying Math Electrical Energy Used by a Microwave Oven
                                                                                                                                                                                                                                    • Lab Design Your Own - Comparing Series and Parallel Circuits
                                                                                                                                                                                                                                    • Science and Language Arts Invisible Man
                                                                                                                                                                                                                                      • Chapter 13 Study Guide
                                                                                                                                                                                                                                      • Chapter 13 Review
                                                                                                                                                                                                                                      • Chapter 13 Standardized Test Practice
                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                          • Launch Lab The Strength of Magnets
                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                          • Section 1 Magnetism
                                                                                                                                                                                                                                            • MiniLAB Observing Magnetic Interference
                                                                                                                                                                                                                                            • Integrate Earth Science
                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                            • Applying Science How can magnetic parts of a junk car be salvaged
                                                                                                                                                                                                                                            • MiniLAB Making Your Own Compass
                                                                                                                                                                                                                                              • Section 2 Electricity and Magnetism
                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                  • Section 3 Producing Electric Current
                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                    • Visualizing Motors and Generators
                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                    • Lab Electricity and Magnetism
                                                                                                                                                                                                                                                    • Lab Design Your Own - Controlling Electromagnets
                                                                                                                                                                                                                                                    • Science and History Body Art
                                                                                                                                                                                                                                                      • Chapter 14 Study Guide
                                                                                                                                                                                                                                                      • Chapter 14 Review
                                                                                                                                                                                                                                                      • Chapter 14 Standardized Test Practice
                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                          • Launch Lab Can electromagnetic waves change materials
                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                          • Section 1 What are electromagnetic waves
                                                                                                                                                                                                                                                            • MiniLAB Investigating Electromagnetic Waves
                                                                                                                                                                                                                                                            • Applying Math The Speed of Light in Water
                                                                                                                                                                                                                                                              • Section 2 The Electromagnetic Spectrum
                                                                                                                                                                                                                                                                • MiniLAB Heating with Microwaves
                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                • Lab The Shape of Satellite Dishes
                                                                                                                                                                                                                                                                  • Section 3 Radio Communication
                                                                                                                                                                                                                                                                    • Visualizing Radio Broadcasts
                                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Lab Use the Internet - Radio Frequencies
                                                                                                                                                                                                                                                                    • Science and History Riding a Beam of Light
                                                                                                                                                                                                                                                                      • Chapter 15 Study Guide
                                                                                                                                                                                                                                                                      • Chapter 15 Review
                                                                                                                                                                                                                                                                      • Chapter 15 Standardized Test Practice
                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                          • Launch Lab Heating with Solar Energy
                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                          • Section 1 Fossil Fuels
                                                                                                                                                                                                                                                                            • Visualizing The Formation of Fossil Fuels
                                                                                                                                                                                                                                                                            • MiniLAB Designing an Efficient Water Heater
                                                                                                                                                                                                                                                                              • Section 2 Nuclear Energy
                                                                                                                                                                                                                                                                                • Integrate Earth Science
                                                                                                                                                                                                                                                                                • Integrate Social Science
                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                • Applying Science Can a contaminated radioactive site be reclaimed
                                                                                                                                                                                                                                                                                  • Section 3 Renewable Energy Sources
                                                                                                                                                                                                                                                                                    • MiniLAB Using Solar Power at Home
                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                    • Lab Solar Heating
                                                                                                                                                                                                                                                                                    • Lab Use the Internet How much does energy really cost
                                                                                                                                                                                                                                                                                    • Science and Society Reacting to Nuclear Energy
                                                                                                                                                                                                                                                                                      • Chapter 16 Study Guide
                                                                                                                                                                                                                                                                                      • Chapter 16 Review
                                                                                                                                                                                                                                                                                      • Chapter 16 Standardized Test Practice
                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                          • Lab Atmospheric Pressure
                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                          • Section 1 Earths Atmosphere
                                                                                                                                                                                                                                                                                            • MiniLAB Visualizing Convection
                                                                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                                                                            • Lab Visualizing a Temperature Inversion
                                                                                                                                                                                                                                                                                              • Section 2 Weather
                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Coriolis Effect
                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                  • Section 3 Climate
                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                    • Visualizing Earths Biogeophysical System
                                                                                                                                                                                                                                                                                                      • Section 4 Earths Changing Climates
                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                        • Applying Math Carbon Dioxide (CO2) Concentration
                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Investigating Microclimate
                                                                                                                                                                                                                                                                                                        • Science and Language Arts The Grapes of Wrath
                                                                                                                                                                                                                                                                                                          • Chapter 17 Study Guide
                                                                                                                                                                                                                                                                                                          • Chapter 17 Review
                                                                                                                                                                                                                                                                                                          • Chapter 17 Standardized Test Practice
                                                                                                                                                                                                                                                                                                              • Unit 5 Matter and Earth Materials
                                                                                                                                                                                                                                                                                                                • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                  • Launch Lab Demonstrate the Distillation of Water
                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                  • Section 1 Composition of Matter
                                                                                                                                                                                                                                                                                                                    • Visualizing Elements
                                                                                                                                                                                                                                                                                                                    • MiniLAB Classifying Materials
                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                    • Lab Comparing Pure Substances and Mixtures
                                                                                                                                                                                                                                                                                                                      • Section 2 Properties of Matter
                                                                                                                                                                                                                                                                                                                        • Integrate Environment
                                                                                                                                                                                                                                                                                                                        • MiniLAB Separating Ink
                                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                                        • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                        • Applying Math The Law of Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Measuring the Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Science Stats Intriguing Elements
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Study Guide
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Review
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                            • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                              • Launch Lab Inferring What You Cant Observe
                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                              • Section 1 Structure of the Atom
                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling an Aluminum Atom
                                                                                                                                                                                                                                                                                                                                • Visualizing The Atomic Model
                                                                                                                                                                                                                                                                                                                                  • Section 2 Masses of Atoms
                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                    • Applying Science How can radioactive isotopes help tell time
                                                                                                                                                                                                                                                                                                                                      • Section 3 The Periodic Table
                                                                                                                                                                                                                                                                                                                                        • MiniLAB Organizing a Personal Periodic Table
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Career
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                                                                                                                                                                        • Lab A Periodic Table of Foods
                                                                                                                                                                                                                                                                                                                                        • Lab Use the Internet Whats in a name
                                                                                                                                                                                                                                                                                                                                        • Science and History A Chilling Story
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Study Guide
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Review
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                            • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                              • Launch Lab Earth Materials at Home and School
                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                              • Section 1 Minerals
                                                                                                                                                                                                                                                                                                                                                • MiniLAB Identifying Salts Crystal System
                                                                                                                                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                • Lab Be a Mineral Detective
                                                                                                                                                                                                                                                                                                                                                  • Section 2 Igneous Rocks
                                                                                                                                                                                                                                                                                                                                                    • Applying Math Extrusive Igneous Rock Classification
                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                      • Section 3 Sedimentary Rocks
                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Evaporites
                                                                                                                                                                                                                                                                                                                                                          • Section 4 Metamorphic Rocks and the Rock Cycle
                                                                                                                                                                                                                                                                                                                                                            • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                            • Visualizing Shock Metamorphic Rock
                                                                                                                                                                                                                                                                                                                                                            • Lab Identifying Rocks
                                                                                                                                                                                                                                                                                                                                                            • Science and Society Earth Materials at Work
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Study Guide
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Review
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                  • Launch Lab Have you got the time
                                                                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                                                                  • Section 1 Weathering and Soil
                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing a Disappearing Seasoning
                                                                                                                                                                                                                                                                                                                                                                    • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                    • Lab Graphing Soil Textures
                                                                                                                                                                                                                                                                                                                                                                      • Section 2 Shaping the Landscape
                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Runoff
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                          • Section 3 Groundwater
                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Porosity Volume
                                                                                                                                                                                                                                                                                                                                                                            • Visualizing The Role of Groundwater in Shaping Earths Surface
                                                                                                                                                                                                                                                                                                                                                                            • Integrate Environment
                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                              • Section 4 Geologic Time
                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                                                                                                • Lab Its about time - relative that is
                                                                                                                                                                                                                                                                                                                                                                                • Science and Society Tapping into the Underground
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Review
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                      • Unit 6 Interactions of Matter
                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                          • Lab Chemical Bonds and Mixing
                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Stability in Bonding
                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                            • Lab Atomic Trading Cards
                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Types of Bonds
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Observing a Bond Type
                                                                                                                                                                                                                                                                                                                                                                                                • Visualizing Polar Molecules
                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Writing Formulas and Naming Compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math Determining a Formula
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Science Can you name binary ionic compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Making a Hydrate
                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Model and Invent - Modeling Chemical Bonding
                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Sticky Subject
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Review
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab RustingmdashA Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Chemical Changes
                                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Designing a Team Equation
                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Chemical Equations
                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math Barium Sulfate Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Classifying Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 4 Reaction Rates and Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing Chemical Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Creating a Colorful Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab To Glow or Not to Glow
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Investigating Reaction Conditions
                                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Clumsy Move Pays Off
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Review
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                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab Magic Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 How Solutions Form
                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                                                                                                                                                                                                                                                            • Visualizing Metal Alloys
                                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Observing the Effect of Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Solubility and Concentration
                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Acids Bases and Salts
                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing Acid Relief
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Strength of Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Determining Acidity
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Saturated Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and Society Acid Rain
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab The Size of a Nucleus
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Strong Force
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Nuclear Decay
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Detecting Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math The Age of Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Social Studies
                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Nuclear Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling a Nuclear Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Visualizing PET Scans
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Chain Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Model and Invent Modeling Transmutations
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and History The Nuclear Alchemist
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Study Guide
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                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab Stars in the Sky
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Observing the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling a Telescope
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math The Magnifying Power of Telescopes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Evolution of Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Counting Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing H-R Diagrams of Star Clusters
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Star Cluster Age
                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 3 Galaxies and the Milky Way
                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 4 Cosmology
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Study Guide
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Page 4: 706 S1 318-326 GPS09 - Light-and-Sound - home · PDF fileWhat sound does a ruler make? ... sound waves cannot travel in empty space where there are no particles. ... sound travels

SECTION 1 Sound 321

The Speed of Sound in Different Materials The speedof a sound wave in a medium depends on the type of substanceand whether it is a solid liquid or gas For example Table 1

shows the speed of sound in different mediums at room temper-ature In general sound travels slowest in gases and fastest insolids

Temperature and the Speed of Sound The speed ofsound waves also depends on the temperature of the mediumAs the temperature of a substance increases its atoms andmolecules move faster At a higher temperature atoms andmolecules collide with each other more frequently As a resultsound waves move faster For example in air at a temperature of0C sound travels at a speed of 331 ms but in air at a temper-ature of 20C sound travels at 343 ms

Amplitude and Energy of Sound WavesThink about the differences among sounds you hear Some

are loud others are soft The flute plays high notes whereas thetuba is much lower What properties of sound waves cause thesedifferences in the sounds you hear

Recall that the amount of energy a wave carries correspondsto its amplitude For a compressional wave amplitude is relatedto the density of the particles in the compressions and rarefac-tions A vibrating object makes a wave by transferring energy tothe medium More energy is transferred to the medium whenthe particles of the medium are forced closer together in thecompressions and spread farther apart in the rarefactions Lookat Figure 2 A sound wave has a higher amplitude and carriesmore energy when particles in the medium are closer togetherin the compressions and more spread out in the rarefactions

Compression Rarefaction

Low-amplitude sound wave

Compression Rarefaction

High-amplitude sound wave

Figure 2 The amplitude of a

sound wave depends on the density

of the particles in the compressions

and rarefactions

In a high-amplitude sound wave

particles are tightly packed in the

compressions and far apart in the

rarefactions

In a low-amplitude sound wave

particles are less tightly packed in

the compressions and not as far

apart in the rarefactions

Table 1 Speed of Soundin Different Mediums

Medium Speed of Sound (ms)

Air (20degC) 343

Cork 500

Water 1498

Brick 3650

Aluminum 5000

GPS+_321

null

10762286

eng - iTunNORM 0000039B 00000000 000024E4 00000000 0000BED0 00000000 00006069 00000000 00005378 00000000

Intensity and LoudnessImagine you are listening to music from your CD player

Sound waves produced by the CD player travel through the airand transfer energy from the CD player to your ears The energythat reaches your ears depends not only on the amplitude of thesound waves but also on how close you are to the CD playerFigure 3 shows that as you get farther from a source of soundthe energy of the sound waves is spread over a greater area Theamount of energy transferred by a sound wave through a certainarea each second is the intensity of the sound wave As soundwaves travel away from the source of the sound the intensity ofthe waves decreases as the waves spread out This means that asyou get farther from the source less energy reaches your earseach second

Loudness When you hear different sounds you do not needspecial equipment to know which sounds have greater intensityYour ears and brain can tell the difference Loudness is thehuman perception of sound intensity As the intensity of asound wave increases the loudness of the sound also increases

How are intensity and loudness related

A Scale for Sound Intensity The intensity of sound can bedescribed using a measurement scale Each unit on the scale forsound intensity is called a decibel abbreviated dB On this scalethe faintest sound that most people can hear is 0 dB Soundswith intensity levels above 120 dB may cause pain and perma-nent hearing loss During some rock concerts sounds reach thisdamaging intensity level Wearing ear protection such asearplugs around loud sounds can help protect against hearingloss Figure 4 shows some sounds and their intensity levels indecibels

Figure 4 The decibel scale meas-

ures the intensity of sound

Identify where a normal speakingvoice would fall on the scale

Figure 3 The intensity of a

sound wave decreases as the wave

spreads out from the source of the

sound The energy of the wave is

spread over a larger area as the

wave spreads out

Whisper

Rustling

leaves

Noisy

restaurant

20 25 50 75 80 100 110 12015

Purring

cat

Average

home

Vacuum

cleaner

Jet plane

taking off

Power

mowerPain

threshold

0dB 150

Loudness in Decibels

322 CHAPTER 11 Sound and Light

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11326502

eng - iTunNORM 0000036D 00000000 00002027 00000000 00005FB6 00000000 0000601D 00000000 0000E76D 00000000

SECTION 1 Sound 323

Pitch and FrequencyYou might be familiar with the music

scale do re mi fa sol la ti do shown inFigure 5 If you were to sing this scale youwould hear the pitch of your voice gethigher Pitch is the human perception ofthe frequency of sound waves Pitch getshigher as the frequency of the sound wavesincreases

Frequency Frequency is a measure of how many wavelengthspass a particular point each second For a compressional wavesuch as sound the frequency is the number of compressions orthe number of rarefactions that pass by each second Frequencyis measured in hertz (Hz) A frequency of 1 Hz means that onecomplete wavelength passes by in 1 s

A healthy human ear can hear sound waves with frequenciesfrom about 20 Hz to 20000 Hz The human ear is most sensi-tive to sounds in the range of 440 Hz to about 7000 Hz In thisrange most people can hear much fainter sounds than they canat higher or lower frequencies

Ultrasonic and Infrasonic Waves Most people canrsquot hearsound frequencies above 20000 Hz which are called ultrasonicwaves Dogs can hear sounds with frequencies up to about35000 Hz and bats can detect frequencies higher than 100000Hz Even though humans canrsquot hear ultrasonic waves they havea number of uses For example ultrasonic waves directed intothe human body are used in medical diagnosis and treatmentUltrasonic waves are reflected by objects underwater and can beused to determine the size shape and depth of underwaterobjects

Infrasonic or subsonic waves have frequencies below20 Hzmdashtoo low for most people to hear These waves are pro-duced by sources that vibrate slowly such as wind heavymachinery and earthquakes Although you canrsquot hear infrasonicwaves you might feel them as a rumble inside your body

The Doppler EffectImagine that you are standing at the side of a racetrack with

race cars zooming past As they move toward you the pitches oftheir engines become higher As they move away the pitchesbecome lower The change in pitch or frequency due to therelative motion of a wave source is called the Doppler effect

Figure 5 Every note has a

different frequency which gives it

a distinct pitch

Describe how pitch changes whenfrequency increases

C

do

262

Hz

D

re

294

Hz

E

mi

330

Hz

F

fa

349

Hz

G

sol

392

Hz

A

la

440

Hz

B

ti

494

Hz

C

do

523

Hz

Comparing IntensityProcedure 1 Complete the safety form

2 Tie the middle of a 50-cm

length of string to a metal

object such as a spoon3 Wrap each end of the

string around a finger on

each hand Place one of

these fingers in each ear

4 Swing the object so it

bumps against a table or

a chair Note the sound

5 Take your fingers out of

your ears and repeat

step 4

Analysis1 Compare the sounds you

heard in both trials

2 Compare the intensity of

the sound waves that

reached your

ears in both

trials

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324 CHAPTER 11 Sound and Light

A Moving Source of Sound As a race car moves it producessound waves in the form of compressions and rarefactions InFigure 6A the race car creates a compression labeled ACompression A moves through the air toward the flagger By thetime compression B leaves the race car in Figure 6B the car hasmoved forward Because the car has moved since the time it createdcompression A compressions A and B are closer together in frontof the car than they would be if the car had stayed still Because thecompressions are closer together more compressions pass by theflagger each second than if the car had been at rest As a result theflagger hears a higher pitch Figure 6B also shows that the compres-sions behind the moving car are farther apart resulting in a lowerfrequency The flagger hears a lower pitch after the car passes

A Moving Listener You also can hear the Doppler effect whenyou are moving past a sound source that is standing still Supposeyou were riding in a school bus and passed a building with a ring-ing bell The pitch would become higher as you approached thebuilding and lower as you rode away from it The Doppler effecthappens any time the source of a sound is changing position rel-ative to the listener It occurs no matter whether it is the soundsource or the listener that is moving The faster the change inposition the greater the change in frequency and pitch

How does pitch change if you are moving awayfrom a sound source

The race car creates compression A which

spreads through the air in all directions from the

point where it was created

The car is closer to the flagger when it creates

compression B Compressions A and B are closer

together in front of the car so the flagger hears a

higher-pitched sound

Figure 6 The Doppler effect occurs when the

source of a sound wave is moving relative to a

listener

Compression A

Compression B

Compression A

Red Shift The Dopplereffect can also beobserved in light wavesemanating from movingsourcesmdashalthough thesources must be movingat tremendous speedsAstronomers have learnedthat the universe isexpanding by observingthe Doppler effect in lightwaves Research thephenomenon known asred shift and explain inyour Science Journal howit relates to the Dopplereffect

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SECTION 1 Sound 325

Using SoundWhen sound waves strike an object they can be absorbed by

the object transmitted through the object or reflected from theobject By detecting the sound waves reflected from an objectthe size shape and location of an object can be determined

Echolocation and Sonar Some species of bats as well asdolphins whales and other animals use sound waves to detecttheir prey Echolocation is the process of locating objects byemitting sounds and detecting the sound waves that reflect back

Sonar is a system that uses the reflection of underwater soundwaves to detect objects First a sound pulse is emitted underwa-ter The sound waves travel in the water and are reflected whenthey strike an object such as a fish or a ship An underwatermicrophone detects the reflected waves Because the speed ofsound in water is known the distance to the object can be calcu-lated by measuring how much time passes between when thesound pulse is emitted and when the reflected signal is received

USING SONAR A sonar pulse returns in 300 s from a sunken ship that is directly below Find

the depth of the ship if the speed of the pulse is 1500 ms Hint The sonar pulse travels a

distance equal to twice the depth of the ship so use the equation d = st2 to find the depth

known values and the unknown value

Identify the known values

speed of sound in water s 1500 ms

time for round trip t 300 s

Identify the unknown value

depth of the ship d m

the problem

Substitute the known values s 1500 ms and t 300 s into the equation for depth

d s2t

(1500 m2s)(300 s)

12

(4500 m) 2250 m

your answer

Check your answer by dividing the distance by the time and multiplying by 2 The result

should be the speed of sound given in the problem

CHECK

SOLVE

means

means

means

IDENTIFY

Solve a Simple Equation

Find the speed of a sonar pulse that returns in 20 s from a ship at a depth of 1500 m

For more practice problems go to page 879 and visit Math Practice at gpesciencecom

Topic SonarVisit for Web

links to information about ways

sonar is used

Activity Research to find out

the different types of sonar Make

a poster that describes active and

passive sonar

gpesciencecom

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326 CHAPTER 11 Sound and Light

Self Check

1 Explain how sound travels from your vocal cords to

your friendrsquos ears when you talk

2 Explain how the loudness of a sound wave depends on

the intensity of the sound wave

3 Draw and label a diagram that explains the Doppler

effect

4 Describe at least three uses of ultrasonic technology in

medicine

5 Think Critically How could sonar technology be used

to locate deposits of oil and minerals

Summary

Sound Waves

bull Sound waves are compressional waves that

are produced by vibrating objects

bull Sound usually travels fastest in solids and

slowest in gases

bull Sound travels faster as the temperature of

the medium increases

Properties of Sound

bull The amplitude of sound waves increases as

the density of particles increases in the com-

pressions and decreases in rarefactions

bull Loudness is the human perception of the

intensity of sound waves Pitch is the human

perception of the frequency of sound waves

bull The Doppler effect is the change in the fre-

quency of a sound wave when the source of

the sound is moving relative to a listener

6 Calculate Time How long would it take a sound

wave from a car alarm to travel 10 km in air if the air

temperature were 0degC

7 Calculate Distance If sound travels in the ocean with

a speed of 1500 ms how far will a sonar pulse travel

in 45 s

Ultrasound in Medicine High-frequency soundwaves can also be used to remove dirt buildup on jew-elry and glassware One of the most important uses ofultrasonic waves though is in medicine Using spe-cial instruments medical professionals can sendultrasonic waves into a specific part of a patientrsquosbody Reflected ultrasonic waves are used to examinedifferent body parts and to detect and monitor cer-tain types of heart disease and cancer Ultrasoundimaging also is used to monitor the development of afetus as shown in Figure 7 However ultrasound doesnot produce good images of the bones and lungsbecause hard tissues and air absorb the ultrasonicwaves instead of reflecting them

High-frequency sound waves can be used to treatcertain medical problems For example sometimes small harddeposits of calcium compounds or other minerals form in thekidneys making kidney stones In the past physicians had toperform surgery to remove kidney stones Now ultrasonic treat-ments are commonly used to break them up instead Bursts ofultrasound create vibrations that cause the stones to break intosmall pieces that can easily pass out of the body with the urineA similar treatment is available for gallstones

Figure 7 Ultrasonic waves are

directed into a pregnant womanrsquos

uterus to form images of her fetus

More Section Review gpesciencecom

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Opaque

Translucent

Transparent

SECTION 2 Reflection and Refraction of Light 327

The Interaction of Light and MatterLook around your darkened room at night You know that

some of the objects are brightly colored but they look gray orblack in the dim light Turn on the light and you can see all theobjects in the room clearly including their colors What you seedepends on the amount of light in the room and the color of theobjects For you to see an object it must reflect or emit somelight that reaches your eyes

Absorption Transmission and Reflection Objects canabsorb light reflect light and transmit lightmdashallow light to passthrough them The type of matter in an object determines theamount of light it absorbs reflects and transmits For examplethe opaque material in the top candleholder in Figure 8 onlyabsorbs and reflects lightmdashno light passes through it As a resultyou cannot see the candle inside Materials that allow some lightto pass through them like the material of the middle candle-holder in Figure 8 are described as translucent You cannot seeclearly through translucent materials

Transparent materials such as the bottom candleholder inFigure 8 transmit almost all the light striking them so you cansee objects clearly through them Only a small amount of lightis absorbed and reflected by transparent materials

Reflection andRefraction of Light

Reading Guide

Describe how light waves interact

with matter Explain the difference between

regular and diffuse reflection Define the index of refraction of a

material Explain why a prism separates

white light into different colors

The images you see every day are

due to the behavior of light waves

Review Vocabulary

visible light an electromagnetic

wave with wavelengths between

about 400 and 700 billionths of a

meter

New Vocabulary

bull opaque

bull translucent

bull transparent

bull index of refraction

Figure 8 These candleholders

interact with light differently

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328 CHAPTER 11 Sound and Light

Reflection of LightHave you glanced in a mir-

ror today You see your reflec-tion in the mirror when light isreflected off you strikes themirror and is reflected off themirror into your eye Becauselight behaves as a wave itobeys the law of reflection asshown in Figure 9 Recall thataccording to the law of reflec-tion the angle at which a lightwave strikes a surface is thesame as the angle at which it is

reflected Light reflected from any surfacemdasha mirror or a sheetof papermdashobeys this law

Regular and Diffuse Reflection Why can you see yourreflection in a store window but not in a sheet of paper Theanswer has to do with the smoothness of the surfaces A smootheven surface such as a pane of glass produces a sharp image byreflecting parallel light waves in only one direction Reflection oflight waves from a smooth surface is regular reflection To causea regular reflection the roughness of a surface must be less thanthe wavelengths it reflects A sheet of paper has an uneven sur-face that causes incoming parallel light waves to be reflected inmany directions as shown in Figure 10 Reflection of light froma rough surface is diffuse reflection

Scattering Diffuse reflection is a type of scattering thatoccurs when light waves traveling in one direction are made totravel in many different directions Scattering also occurs whenlight waves traveling through the air reflect off small particlesAn example is light scattering off the small water droplets thatmake up a cloud Scattering causes the cloud to appear whiteeven though the droplets are transparent

What is scattering of light

Figure 9 According to the law of

reflection light is reflected so that

the angle of incidence always

equals the angle of reflection

Figure 10 A sheet of paper

has an uneven surface that

produces a diffuse reflection

Explain Use the law ofreflection to explain why arough surface causes parallellight waves to be reflected inmany directions

Mirror

i = angle of

incidence

i

r

i

r

r = angle of

reflection

Normal

Normal

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Refraction of LightWhat occurs when a light wave passes from one material to

anothermdashfrom air to water for example Recall that refractionis caused by a change in the speed of a wave when it passes fromone material to another If the light wave is traveling at an angleto the boundary between the materials and the speed of light isdifferent in the two materials the wave will be bent or refracted

Why does refraction occur

The Index of Refraction The amount of bending that takesplace depends on the speeds of light in both materials Thegreater the change in speed the more the light will be bent asit passes at an angle from one material to the other Figure 11

shows an example of refraction Every material has an index ofrefraction which is the ratio of the speed of light in a vacuum tothe speed of light in the material The index of refraction indi-cates how much the speed of light is reduced in the materialcompared to its speed in empty space

The larger the index of refraction the more light is sloweddown in the material For example because glass has a largerindex of refraction than air light moves more slowly in glassthan air The index of refraction is usually largest for solids andsmallest for gases

Prisms A sparkling glass prism hangs in a sunny windowrefracting the sunlight and projecting a colorful pattern onto thewalls of the room How does the refraction of light create thesecolors The spectrum of colors is produced because the speed oflight in a material also depends on the wave-length of the light In a glass prism light waveswith longer wavelengths such as red light wavesare slowed less than light waves with shorterwavelengths such as blue light waves

Figure 12 shows what occurs when whitelight passes through a prism White light suchas sunlight is made up of light waves withrange of wavelengths from red to blue The tri-angular prism refracts the light twicemdashoncewhen it enters the prism and again when itleaves the prism and reenters the air Becausethe longer wavelengths of light are slowed lessthan the shorter wavelengths are red light isbent the least As a result of these differentamounts of bending the different colors areseparated when they emerge from the prism

Figure 11 The spoon looks

broken because light waves are

refracted as they change speed

when they pass from the water to

the air

329

Figure 12 Refraction causes a

prism to separate a beam of white

light into different colors

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330 CHAPTER 11 Sound and Light

Self Check

1 Compare and contrast opaque transparent and

translucent materials Give one example of each

2 Discuss why you can see your reflection in a smooth

piece of aluminum foil but not in a crumpled ball of foil

3 Infer what happens to light waves that are reflected off

dust particles in the air

4 Explain what happens to white light when it passes

through a prism

5 Think Critically Suppose a material has the same index

of refraction as water How would a light wave change

direction as it traveled from water into this material

Summary

Light and Matter

bull The amount of light that is absorbed

reflected or transmitted depends on the

material making up the object

Reflection of Light

bull Light waves always obey the law of reflection

the angle of incidence equals the angle of

reflection

bull Regular reflection causes parallel light waves

to be reflected in only one direction

bull Diffuse reflection causes parallel light waves

to be reflected in many directions

bull Scattering occurs when light waves are reflected

and travel in many different directions

Refraction of Light

bull Refraction occurs when a light wave changes

speed in moving from one material to another

bull The index of refraction of a material indicates

how much light slows down in the material

6 Find an Angle A light wave strikes a mirror at an

angle of 42deg from the surface of the mirror What

angle does the reflected wave make with the normal

7 Find an Angle A light wave reflects from a mirror at

27deg from the normal What was the angle between

the mirror and the incident wave

Mirages When yoursquore traveling in a car you might see whatlooks like a pool of water on the road ahead As you get closerthe water seems to disappear Yoursquove seen a miragemdashan image ofa distant object produced by the refraction of light through airlayers of different densities Mirages result when the air atground level is much warmer or cooler than the air above asshown in Figure 13 The density of air increases as air cools andlight waves move slower in cooler air than in warmer air As aresult light waves are refracted as they pass through air layerswith different temperatures

Figure 13 Mirages result when

air near the ground is much

warmer or cooler than the air

above This causes light waves

reflected from an object to refract

creating one or more additional

images

MirageWarm air

Cool air

More Section Review gpesciencecom

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SECTION 3 Mirrors Lenses and the Eye 331

Light RaysLight sources send out light waves in all directions These

waves spread out like ripples on the surface of water spread outfrom the point of impact of a pebble You can think of the lightcoming from the source as being many narrow beams of light trav-eling in all directions Each narrow light beam is called a light ray

MirrorsA mirror is any surface that produces a regular reflection A pool

of still water a metal pan and even the back of a shiny spoon can bemirrors Mirrors can be flat curved inward or curved outward

Plane Mirrors A flat smooth mirror is a plane mirror Whenyou look in a plane mirror your image appears upright If youstand 1 m from the mirror your image appears 1 m behind themirror or 2 m from you In fact your image is what a friend stand-ing 2 m from you would see Figure 14 shows how your image isformed First light rays from a light source strike you Every pointthat is struck by the light rays reflects these rays so they travel out-ward in all directions If your friend were looking at you thesereflected light rays coming from you would enter her eyes so shecould see you However if a mirror is placed between you and yourfriend light rays are reflected from the mirror back to your eyes

Mirrors Lenses andthe Eye

Reading Guide

Describe how images are formed

by three types of mirrors Explain how convex and concave

lenses form images Explain how the human eye

enables you to see Describe how lenses are used to

correct vision problems

Mirrors and lenses are used in optical

instruments such as cameras and

telescopes

Review Vocabulary

reflection the process of changing

direction after striking a surface

New Vocabulary

bull plane mirror

bull concave mirror

bull convex mirror

bull convex lens

bull concave lens

Figure 14 Seeing an image of

yourself in a mirror involves two

sets of reflections light rays are

reflected from you and then are

reflected by the mirror

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332 CHAPTER 11 Sound and Light

Virtual and Real Images The forma-tion of an image by a plane mirror isshown in Figure 15 Your brain assumesthat light rays travel in a straight line As aresult rays that enter your eyes seem tocome from behind the mirror This makesthe image seem to be behind the mirrorHowever no light rays actually passthrough the place where the image seemsto be located This type of image is called avirtual image Plane mirrors always formvirtual images If light rays from an objectpass through the location of the image theimage is called a real image Curved mir-rors can form both real and virtual images

Concave Mirrors If the surface of a mirror is curved inwardit is called a concave mirror as shown in Figure 16 The opticalaxis is an imaginary straight line drawn perpendicular to thesurface of the mirror at its center Every light ray traveling par-allel to the optical axis is reflected through a point on the opti-cal axis called the focal point The distance from the center ofthe mirror to the focal point is called the focal length

The image formed by a concave mirror depends on the loca-tion of the object relative to the focal point Figure 16 shows acandle located more than twice the focal length from the mirrorAlthough many light rays come from each point on the candleonly two rays from the same point are shown Ray A passesthrough the focal point and then reflects off the mirror movingparallel to the optical axis Ray B travels parallel to the opticalaxis before reflecting off the mirror and passing through thefocal point The point where the two rays meet is the location ofthe image of the original point on the candle The image formedis a real image because light rays from the candle pass throughthe place where the image is located

Figure 16 Rays A and B start from the same

place on the candle travel in different directions

and meet again on the reflected image

Diagram how two other points on the image ofthe candle are formed

Figure 15 Your brain interprets

the light rays reflected by the

mirror as coming from a point

behind the mirror

Infer how the size of your imagein a plane mirror depends on yourdistance from the mirror

Focalpoint

Optical axis

Ray B

Ray A

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SECTION 3 Mirrors Lenses and the Eye 333

Images Produced by a ConcaveMirror When an object is between oneand two focal lengths from a concavemirror the image is real inverted andlarger than the object An object closerthan one focal length from a concavemirror produces a virtual image that isupright and larger than the object Noimage is produced if the object islocated at the focal point

Convex Mirrors When you are in astore look up toward one of the backcorners or at the end of an aisle to see ifa large rounded mirror is mountedthere You can see a large area of the store in such a mirror Amirror that curves outward like the back of a spoon is called aconvex mirror Light rays that hit a convex mirror diverge orspread apart after they are reflected Figure 17 shows how therays from an object are reflected by a convex mirror to form animage The reflected rays diverge and never meet so a convexmirror forms only a virtual image The image also is upright andsmaller than the actual object is

Describe the image formed by a convex mirror

LensesWhat do your eyes have in common with cameras eyeglasses

and microscopes Each of these contains at least one lens A lens is atransparent object with at least one curved surface that causes lightrays to refract The image that a lens forms depends on the shape ofthe lens Like curved mirrors lenses can be convex or concave

Convex Lenses A convex lens is thicker in the middle than atthe edges Its optical axis is an imaginary straight line that is per-pendicular to the surface of the lens at its thickest point When lightrays approach a convex lens traveling parallel to its opticalaxis the rays are refracted toward the center of the lens asin Figure 18 Light rays traveling along the optical axis arenot bent at all All light rays traveling parallel to the opti-cal axis are refracted so they pass through a single pointwhich is the focal point of the lens The less curved thesides of the lens the less light rays are bent As a resultlenses with flatter sides have longer focal lengths Figure 19

on the next page shows that convex lenses can form eitherreal or virtual images

Figure 18 Convex lenses are

thicker in the middle than at the

edges Light rays that are parallel

to the optical axis are refracted so

that they pass through the focal

point A light ray that passes

through the center of the lens is

not refracted

Figure 17 A convex mirror

forms a reduced upright virtual

image

Optical axis

Ray A

Ray B

Focallength

Focalpoint

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Figure 19

VISUALIZING IMAGES FORMED BY A CONVEX LENS

334 CHAPTER 11 Sound and Light

Aconvex lens can form images that are real or virtual enlarged or reduced and upright orinverted Just as for a concave mirror the type of image formed by a convex lens depends on thelocation of the object relative to the focal point of the lens

Optical axis

One

focal

length

Two

focal

lengthsRay B

Image

Ray A

Object

Focal

point

Optical axis

One

focal

length

Two

focal

lengths

Ray B

Ray AObject

Image

Focal

point

Optical axis

Ray B

ObjectRay A

One

focal

length

Focal

pointImage

If the object is more than two focal lengths from the lens the image formed is real inverted andsmaller than the object As the object moves farther from the lens the image becomes smaller

If the object is between one and two focal lengths from the lens the image formed is real invertedand larger than the object As the object moves closer to the focal point the image becomes larger

If the object is less than one focal length from the lens the image is virtual upright and larger thanthe object The image is virtual because the light rays from the object diverge after they pass throughthe lens The image becomes smaller as the object moves closer to the lens

SECTION 3 Mirrors Lenses and the Eye 335

Concave Lenses A concave lens is thinnerin the middle and thicker at the edges Asshown in Figure 20 light rays that passthrough a concave lens bend away from theoptical axis The rays spread out and nevermeet so a real image is never formed Theimage is always virtual upright and smallerthan the object is Concave lenses are used insome types of eyeglasses and some telescopesConcave lenses usually are used in combinationwith other lenses

What type of image is formed by a concave lens

The Human EyeWhat determines how well you can see the words on this

page If you donrsquot need eyeglasses the structure of your eye givesyou the ability to focus on these words and other objects aroundyou Look at Figure 21 Light enters your eye through a trans-parent covering on your eyeball called the cornea The corneacauses light rays to bend so that they converge The light thenpasses through an opening called the pupil Behind the pupil isa flexible convex lens Muscles attached to the lens change itsshape to help focus light forming a sharp image on your retina

The retina is the inner lining of your eye The retina con-tains light-sensitive cells that convert an image into electricalsignals These signals then are carried along the optic nerve toyour brain to be interpreted With this complex structurethe human eye is capable of seeing clearly in bright and dimconditions focusing on both near and far objects and alsodetecting colors

Figure 20 A concave lens

refracts light rays so they spread

out away from the optical axis

Classify Is a concave lens mostlike a concave mirror or a convexmirror

Optical axis

Retina

Focalpoint

Pupil

Cornea

Lens

Optic nerve

Figure 21 The cornea and lens in your eye

bend light rays so that a sharp image is

formed on the retina

Eye Doctors Optometristsand ophthalmologists treatmany different eye prob-lems They often useadvanced technology todiagnose and correct mal-functioning parts of theeye Research an eye prob-lem and how it is treatedWrite a paragraph describ-ing what parts of the eyeare affected by the problemand how doctors correct it

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336 CHAPTER 11 Sound and Light

Brightness and Intensity The human eye can adjust to thebrightness of the light that strikes it If you step outside on asunny day you may have to shade your eyes against the intensityof the sunlight Light intensity is the amount of light energy thatstrikes a certain area each second Brightness is the human per-ception of light intensity Sunlight seems bright because a largeamount of light energy strikes your retina each second Youreyes respond to bright light by decreasing the size of your pupilThis reduces the amount of light that enters your eye and strikesthe retina

Intensity depends on your distance from a light source Ifyou move away from a bare lightbulb you can see how theintensity of the light rapidly decreases Because light rays spreadout from the source less light energy strikes your retina thefarther away you are from the bulb

Correcting Vision ProblemsIf you have good vision you should be able to see objects

clearly when they are 25 cm or farther away from your eyes Asharp image of an object should be formed on your retinaHowever for many people the image is blurry or formed in thewrong place causing vision problems

Farsightedness If you can see distant objects clearly butcanrsquot bring nearby objects into focus then you are farsighted Inthis case the eyeball might be too short or the lens isnrsquot curvedenough to form a sharp image of nearby objects on the retinaas shown in Figure 22 To correct the problem convex lensescan be used to bend incoming light rays so they converge beforethey enter the eye

Experimenting withFocal LengthsProcedure1 Complete the safety form

2 Fill a glass test tube with

water and seal it with a

lid or stopper3 Type or print SULFUR

DIOXIDE in capital letters

on a piece of paper4 Set the test tube horizon-

tally over the words

Record your observations

5 Hold the tube at several

heights above the words

Record your observations

Analysis1 Describe how the words

changed as the height of

the test tube increased

2 Classify the image at each

height as real or virtual

Focal

point

Correctedfarsighted eye

Light fromnearby object

Focalpoint

Light fromnearby object

Farsighted eye

The focal length of a farsighted eye is too long to form

a sharp image of nearby objects on the retina

A convex lens in front of a farsighted eye enables a sharp

image of nearby objects to be formed on the retina

Figure 22 Farsightedness can

be corrected by convex lenses

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SECTION 3 Mirrors Lenses and the Eye 337

Self Check

1 Diagram how light rays from an object are reflected by

a convex mirror to form an image

2 Infer how the size of the image changes if an object

that is less than one focal length from a concave mirror

moves closer to the mirror

3 Explain how the focal length of a convex lens changes

as the sides of the lens become less curved

4 Compare the image of an object less than one focal

length from a convex lens with the image of an object

more than two focal lengths from the lens

5 Think Critically Describe the image formed by a light

source placed at the focal point of a convex lens

Summary

Mirrors

bull A plane mirror forms upright virtual images

bull The image formed by a concave mirror

depends on the location of the object relative

to the focal point

bull Convex mirrors always produce virtual upright

images that are smaller than the object

Lenses

bull The image formed by a convex lens depends

on the distance of the object from the lens

bull Concave lenses always form virtual upright

images that are smaller than the object

The Eye and Vision

bull The eye contains a lens that changes shape to

produce sharp images on the retina

bull Farsightedness occurs when the eye cannot

form a sharp image of nearby objects

Nearsightedness occurs when the eye cannot

form sharp images of distant objects

6 Calculate Object Distance If you looked through a

convex lens with a focal length of 15 cm and saw a

real inverted enlarged image what is the maximum

distance between the lens and the object

Nearsightedness If you have nearsighted friends you knowthat they can see only nearby objects clearly Their eyes cannotform a sharp image on the retina of an object that is far awayInstead the image is formed in front of the retina as shown inFigure 23 To correct this problem a nearsighted person canwear concave lenses Figure 23 shows how a concave lens causesincoming light rays from distant objects to diverge before theyreach the eye Then the rays can be focused by the eye to form asharp image on the retina

Figure 23 Nearsightedness can

be corrected with concave lenses

Focalpoint

Light fromdistant object

Nearsighted eye

Focalpoint

Light fromdistant object

Correctednearsighted eye

When a nearsighted person looks at distant objects a

sharp image is formed in front of the retina

A concave lens in front of a nearsighted eye makes light

rays diverge so a sharp image is formed on the retina

More Section Review gpesciencecom

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How can you see the back of your head You

can use two mirrors to view a reflection of a

reflection of the back of your head

Real-World ProblemHow many images are seen in two mirrors

Goal Infer how the number of images depends

on the angle between two mirrors

Materialsplane mirrors (2) protractor

masking tape paper clip

Safety Precautions

Handle glass mirrors and paper clips carefully

Procedure1 Complete the safety form

2 Lay one mirror on top of the other with the

mirror surfaces together Tape together one

side so they can open and close Use tape to

label them L and R for left and right

3 Open the mirrors and stand them on a sheet

of paper at an angle of 72deg

4 Bend one leg of a paper clip up 90deg and

place it close to the front of the R mirror

5 Count the number of images of the paper

clip you see in the R and L mirrors Record

these numbers in your data table

6 The mirrors create an image of a circle

divided into wedges Record the number

of wedges

7 Hold the R mirror still and slowly move the Lmirror to 90deg Record the numbers of images

of the clip and wedges in the circle Repeat

this time opening the mirrors to 120deg

Conclude and Apply1 Infer the relationship between the number

of wedges and paper clip images

2 Determine the angle that would divide a

circle into six wedges Hypothesize how

many images would be produced Test your

hypothesis

Reflections of Reflections

Demonstrate for younger students the

relationship between the angle of the

mirrors and the number of reflections

338 CHAPTER 11 Sound and Light

Angle

Number of Number

of Mirrors Paper Clip Images

of Wedges R L

72ordm

90ordm

120ordm

Images and Wedges Seen in the Mirrors

Do not write in this book

SECTION 4 Light and Color 339

Why Objects Have ColorWhy do some apples appear red while others look green or

yellow An objectrsquos color depends on the wavelengths of light itreflects Recall that white light is a blend of all colors of visiblelight When a red apple is struck by white light it reflects redlight back to your eyes and absorbs all of the other colorsFigure 24 shows white light striking a green leaf Only the wave-lengths corresponding to green light are reflected to your eyes

Although some objects appear to be black black isnrsquot acolor Black is the absence of visible light Objects that appearblack absorb all colors of light and reflect little or no light backto your eyes White objects appear to be white because theyreflect all colors of visible light

Why does a white object appear white

Colored Filters Wearing tinted glasses changesthe color of almost everything you see If the lensesare yellow the world takes on a golden glow If theyare rose colored everything looks rosy Somethingsimilar would occur if you placed a colored clearplastic sheet over this white page The paper wouldappear to be the same color as the plastic The plasticsheet and the tinted lenses are filters A filter is atransparent material that transmits one or more col-ors of light but absorbs all others The color of a fil-ter is the color of the light that it transmits

Light and Color

Reading Guide

Explain how you see color Describe the difference between

light color and pigment color Predict what happens when dif-

ferent colors are mixed

From traffic lights to great works of

art color is an important part of your

world

Review Vocabulary

retina inner layer of the eye con-

taining cells that convert light

images into electrical signals

New Vocabulary

bull pigment

Figure 24 This leaf absorbs all

wavelengths of visible light except

the wavelengths you see as green

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340 CHAPTER 11 Sound and Light

Looking Through Colored Filters Figure 25 shows howthe color of an object can change when you look at it throughvarious colored filters The cooler looks blue under white lightbecause it reflects only the wavelengths of blue light that strikeit If you look at the cooler through a blue filter the cooler stilllooks blue because the blue filter transmits the reflected bluelight However if you look at the cooler through a red filter thecooler seems black because the red filter blocks the blue lightreflected by the cooler

Why does a blue object appear black whenviewed through a red filter

Seeing ColorAs you approach a busy intersection the color of the traffic

light changes from green to yellow to red On the cross street thecolor changes from red to green At a busy intersection trafficsafety depends on your ability to detect color changes rapidlyHow do you see colors

Light and the Eye In a healthy eye light enters the eyethrough the cornea is focused by the lens and finally forms animage on the retina The retina is made up of two types of cellsthat absorb light as shown in Figure 26 When these cellsabsorb light energy chemical reactions convert light energy intonerve impulses that are transmitted to the brain One type ofcell in the retina called a cone enables you to distinguish colorsand detailed shapes of objects Cones need bright light to gener-ate nerve impulses so they do not operate in dim light As aresult even brightly colored objects might look gray or black indim light

Figure 25 The color of this

cooler changes when viewed

through different color filters

Topic Color BlindnessVisit for Web

links to information about the

causes of color blindness

Activity Research the causes

and types of color blindness Find

out how cones are related to the

ability to distinguish colors

gpesciencecom

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SECTION 4 Light and Color 341

Cones and Rods Your eyes have three types of cones each ofwhich responds to a different range of wavelengths Red conesrespond to mostly red and yellow light Green cones respond tomostly yellow and green light Blue cones respond to mostlyblue and violet light The second type of cell in the retina calleda rod is sensitive to dim light and enables you to see at nightHowever rod cells do not enable you to see colors

Interpreting Color Why does a bananalook yellow The light reflected by the

banana causes the cone cells that are sensitive to red and greenlight to send signals to your brain Your brain could get the samesignal if a mixture of red light and green light reached your eyesThis mixture also would cause your red and green cones torespond and you would see the color yellow As a result lightwith wavelengths corresponding to yellow light and light that isa mixture of red and green light both cause the color yellow tobe seen What happens when you look at a white shirt You seewhite when all wavelengths of visible light enters your eyes Thenall three sets of cones cells send signals to the brain The com-bination of these signals cause you to see the shirt as white

Color Blindness If one or more of your sets of cone cellsdo not function properly you might not be able to distinguishcertain colors This condition is called color blindness orcolor deficiency About eight percent of men and one-halfpercent of women have some form of color blindness Themost common form of color blindness makes it difficult todistinguish between red and green Figure 27 shows an imagethat is used in a test for redndashgreen color blindness Becausered and green are used in traffic signals drivers and pedestri-ans must be able to identify them

Retina

Rod

Cone

Lens

Figure 27 Color blindness is an

inherited sex-linked condition in

which certain sets of cones in the

retina do not function properly

Identify the number that you seein the dots

Figure 26 Light enters the eye

and focuses on the retina The two

types of light-detecting cells

that make up the retina

are called rods and cones

GPS+_341

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342 CHAPTER 11 Sound and Light

Mixing ColorsIf you have ever browsed through a paint store you have

probably seen displays where customers can select paint samplesof almost every imaginable color The colors are a result of mix-tures of pigments For example you might have mixed blue andyellow paint to produce green paint A pigment is a coloredmaterial that is used to change the color of other substancesThe color of a pigment results from the different wavelengths oflight that the pigment reflects

Mixing Colored Lights From the glowing orange of a sun-set to the deep blue of a mountain lake all the colors you see canbe made by mixing three colors of light These three colorsmdashred green and bluemdashare the primary colors of light They cor-respond to the three different types of cones in the retina ofyour eye When mixed together in equal amounts they producewhite light as Figure 28 shows Mixing the primary colors indifferent proportions can produce the colors you see

What are the primary colors of light

Paint Pigments If you were to mix equal amounts of redgreen and blue paint would you get white paint If mixing col-ors of paint were like mixing colors of light you would but mix-ing paint is different Paints are made with pigments Pigmentsproduce color as a result of the wavelengths of light they reflectPaint pigments usually are made of chemical compounds suchas titanium oxide a bright white pigment and lead chromatewhich is used for painting yellow lines on highways

Figure 28 White light is pro-

duced when the three primary col-

ors of light are mixed in equal

amounts

Color for PhotosynthesisPlant pigments determinethe wavelengths oflight for photosynthesisLeaves usually look greenbecause of the pigmentchlorophyll Chlorophyllabsorbs most wave-lengths of visible lightexcept green which itreflects However not allplants are green Researchdifferent plant pigmentsto find out how they allowplant species to survive indiverse habitats

GPS+_342

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SECTION 4 Light and Color 343

Self Check

1 Identity what colors are reflected and what colors are

absorbed if a white light shines on a red shirt

2 Discuss how the primary colors of light differ from the

primary pigment colors

3 Explain why a red apple would appear black if you

looked at it through a blue filter

4 Determine why a white fence appears to be white instead

of multicolored if all colors are present in white light

5 Think Critically Light reflected from an object passes

through a green filter then a red filter and finally a

blue filter What color will the object seem to be

Summary

Why Objects Have Color

bull The color of an object is determined by the

wavelengths of light it reflects

bull The color of a filter is the color of the light the

filter transmits

Seeing Color

bull Rod and cone cells are light-sensitive cells

found in the retina of the human eye

bull Rod cells are sensitive to dim light Cone cells

enable colors to be seen

bull There are three types of cone cells One type

responds to red light another to green light

and another to blue light

Mixing Colors

bull Red green and blue are the primary light

colors Any color of light can be created by

mixing these primary light colors

bull Any pigment color can be formed by mixing

the primary pigment colorsmdashmagenta cyan

and yellow

6 Use Percentages In the human eye there are about

120000000 rods If 90000000 rods trigger at once

what percentage of the total number of rods triggered

7 Convert Units The wavelengths of light are measured

in nanometers (nm) which equals 0000001 mm

Find the wavelength in mm of a light wave that has a

wavelength of 690 nm

Mixing Pigments You can make any pigment color by mixingdifferent amounts of the three primary pigmentsmdashmagenta(bluish red) cyan (greenish blue) and yellow In fact color print-ers use these pigments as well as black ink to make full-colorprints like the pages in this book A primary pigmentrsquos colordepends on the wavelengths of the light that it reflects Actuallypigments both absorb and reflect a range of colors in sending asingle color message to your eye For example in white lightyellow pigment appears yellow because it reflects red and greenlight but absorbs the other wavelengths of visible light The colorof a mixture of two primary pigments is determined by theprimary colors of light that both pigments reflect

Look at Figure 29 The area in the center where the colors alloverlap appears to be black because the three blended primarypigments absorb all the primary colors of light Recall that theprimary colors of light combine to produce white light They arecalled additive colors However when the primary pigment col-ors are combined they absorb all wavelengths of visible light andproduce black Because black results from the absence ofreflected light the primary pigments are called subtractive colors

Figure 29 The three primary

pigment colors appear to be black

when they are mixed

Describe how the primary pigmentcolors are similar to the primary col-ors of light

More Section Review gpesciencecom

GPS+_343

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Design Your OwnDesign Your Own

344

Real-World ProblemWhat loud noises do you enjoy and which ones do you find annoying

Most people enjoy a music concert performed by their favorite artist or

the booming displays of fireworks on the Fourth of July Most people

enjoy these loud sounds for short periods of time However certain

other loud noises such as traffic sirens and loud talking can be

annoying Constant annoying noises are called noise pollution What

can be done to reduce noise pollution What types of barriers will best

block out noise pollution

Form a HypothesisBased on your experiences with loud noises form a hypothesis that

predicts the effectiveness of different types of barriers at blocking out

noise pollution

Test Your HypothesisMake a Plan

1 Complete the safety form

2 Decide what type of barriers or materials you will test

3 Describe exactly how you will use these materials

Goals Design an experiment

that tests the effective-

ness of various types of

barriers and materials

for blocking out noise

pollution

Test different types of

materials and barriers

to determine the best

noise blocks

Possible Materialsradio CD player horn

drum or other loud

noise source

shrubs trees concrete

walls brick walls stone

walls wooden fences

parked cars or hanging

laundry

sound meter

meterstick or metric tape

measure

Blocking NfisePollution

4 Identify the controls and variables you will use in your

experiment

5 List the steps you will use and describe each step precisely

6 Prepare a data table in your Science Journal to record your

measurements

7 Organize the steps of your experiment in logical order

Follow Your Plan

1 Ask your teacher to approve your plan and data table before

you start

2 Conduct your experiment as planned

3 Test each barrier two or three times

4 Record the results from each test in your data table in your Science Journal

Analyze Your Data1 Identify the barriers that most effectively reduced noise pollution

2 Identify the barriers that least effectively reduced noise pollution

3 Compare the effective barriers and identify common characteristics that might

explain why they reduced noise pollution

4 Compare the natural barriers you tested with the artificial barriers Which type

of barrier best reduced noise pollution

5 Compare the different types of materials the barriers were made of Which

type of material best reduced noise pollution

Conclude and Apply1 Evaluate whether your results support your hypothesis

2 Predict how your results would differ if you used a louder source of noise such

as a siren

3 Infer from your results how people living near a

busy street could reduce noise pollution

4 Identify major sources of noise pollution in or

near your home How could they be reduced

5 Research how noise pollution can be

unhealthy

LAB 345

Draw a poster illustrating how builders and

landscapers could use certain materials to

better insulate a home or office from excess

noise pollution

346 CHAPTER 11 Sound and Light

A Haiku GardenThe Four Seasons in Poems and Prints

by Stephen Addiss with Fumiko and Akira Yamamoto

Respond to the Reading1 How do the illustrations help the reader

better understand the poems2 What do you think is meant by the

word lingering in the Haiku about springsunlight

3 Linking Science and Writing Writeone haiku about summer and anotherabout fall In one poem use color tohelp you describe the season In theother use light or some property oflight to help describe the season

Research has deter-mined that there is a

connection between color and mood Warmcolors have longer wavelengths and can bemore stimulating Cool colors which haveshorter wavelengths tend to have a calmingor soothing effect on people Light and colorhave long been used as literary symbols Doesthe use of color change what you imaginewhen you read the haiku

UnderstandingLiteratureJapanese Haiku A haiku is a verse thatconsists of three lines and 17 syllables inthe Japanese language The first and thirdlines have five syllables each and themiddle line has seven syllables Why isimagination important in reading haiku

Lingering

in every pool of watermdash

spring sunlightIssa

Withered by winter

the sound of the windmdash

one-color worldBasho

Sound

1 Sound waves are compressional waves thattravel only in matter

2 The speed of sound in a material dependson the type of material as well as itstemperature

3 Loudness depends on a sound waversquos inten-sity Pitch depends on a sound waversquosfrequency

4 Sound waves are used in echolocationsonar and medical imaging

Reflection and Refractionof Light

1 Light can be absorbed reflected or trans-mitted by a material

2 When light waves are reflected theyobey the law of reflectionmdashthe angle ofincidence equals the angle of reflection

3 A light wave is refracted or bent whenit changes speed as it travels at an anglefrom one material to another

Mirrors Lenses andthe Eye

1 Plane mirrors form upright virtual images

2 Images formed by concave mirrors andconvex lenses depend on the location ofthe object relative to the focal point

3 Convex mirrors and concave lenses formvirtual upright images that are smallerthan the object

4 The lens in the human eye changes shape toproduce a sharp image on the retina

Light and Color

1 You see color when light is reflected offobjects and into your eyes

2 Cone cells in the retina are light-sensitivecells that enable you to distinguish colors

3 Red blue and green are the three primarycolors of light and can be mixed to form allother colors

4 The primary pigment colors are magentacyan and yellow

CHAPTER STUDY GUIDE 347

Use the Foldable you made at the beginningof the chapter to help you review sound and light

Interactive Tutor gpesciencecom

Complete each statement with the correctvocabulary word or phrase

1 A change in frequency due to a movingsound source is due to the

2 A flat smooth surface that reflects light andforms an image is a(n)

3 An object is if you can seethrough it clearly

4 The of a material indicates howmuch the speed of light in the materialchanges as light passes through

5 You can change the color of white paint byadding a(n) to it

6 A(n) is a reflecting surface thatcurves outward like the back of a spoon

7 The human perception of the intensity of asound wave is

Choose the word or phrase that best answerseach question

8 Which of the following best describes imageformation by a plane mirrorA) A real image is formed in front of the mirrorB) A real image is formed behind the mirrorC) A virtual image is formed in front of the

mirrorD) A virtual image is formed behind the mirror

9 For a sound with low pitch what else isalso always lowA) amplitude C) wavelengthB) frequency D) wave velocity

10 Which of the following occurs when asound source moves away from youA) The soundrsquos velocity decreasesB) The soundrsquos loudness increasesC) The soundrsquos frequency decreasesD) The soundrsquos frequency increases

Use the table below to answer question 11

11 Based on the data in the table abovewhich of the following would be the speedof sound in air at 30degCA) 3404 ms C) 3494 msB) 3464 ms D) 3534 ms

12 What happens to a light ray travelingparallel to the optical axis of a convexlens that passes through the lensA) It travels parallel to the optical axisB) It passes through the focal pointC) It is bent away from the optical axisD) It forms a virtual image

13 Light waves of which color are bent mostwhen passing through a prismA) blue C) violetB) red D) yellow

14 Which way does a concave lens bend lightA) toward its optical axisB) toward its centerC) toward its edgesD) toward its focal point

Speed of Sound in Air

Temp peed( s)

4

4

4

348 CHAPTER REVIEW

concave lens p 335concave mirror p 332convex lens p 333convex mirror p 333decibel p 322Doppler effect p 323index of refraction p 329intensity p 322

loudness p 322opaque p 327pigment p 342pitch p 323plane mirror p 331translucent p 327transparent p 327

Vocabulary PuzzleMaker gpesciencecom

Use the illustration below to answer question 15

15 Describe how the position of the candlechanged if the image of the candle movedaway from the focal point

16 Apply Acoustic scientists sometimes doresearch in rooms that absorb all soundwaves How could such a room be used tostudy how bats find their food

17 Compare White light passes through atranslucent pane of glass and shines on ashirt Both the translucent glass and theshirt appear green Compare the colors oflight that are absorbed and transmitted bythe glass and the shirt

18 Infer Most mammals including dogs andcats canrsquot see colors Infer how the retinaof a catrsquos eye might be different from theretina of a human eye

19 Determine whether a convex lens could forman image that is enlarged real and upright

20 Infer A car comes to a railroad crossingThe driver hears a trainrsquos whistle and itspitch becomes lower What can beassumed about how the train is moving

21 Compare and contrast the reflection of lightfrom a white wall with a rough surfacewith the reflection of light from a mirror

Optical axis

One

focal

length

Two

focal

lengths

Image

Ray A

Object

Focal

point

Interpreting Graphics 22 Infer why a convex mirror and a concavelens can never produce a real image

23 Predict what color a white shirt wouldappear to be if the light reflected from theshirt passed through a red filter and thenthrough a green filter

24 Explain why windows might begin to rattlewhen an airplane flies overhead

25 Communicate Some people enjoy usingsnowmobiles Others object to the noisethat they make Write a proposal for a pol-icy that seems fair to both groups for theuse of snowmobiles in a state park

CHAPTER REVIEW 349

Use the wave speed equation ν ƒλ to answer

questions 26 and 27

26 Calculate Frequency A sonar pulse has awavelength of 30 cm and a speed inwater of 1500 ms Find its frequency

27 Calculate Wavelength What is the wave-length of a sound wave with a fre-quency of 440 Hz if the speed of soundin air is 340 ms

28 Calculate Angle of Incidence A light ray isreflected from a mirror If the anglebetween the incident ray and thereflected ray is 136deg what is the angleof incidence

29 Determine Object Distance You hold anobject in front of a concave mirror witha focal length of 30 cm If you do notsee a reflected image how far from themirror is the object

30 Calculate Speed The speed of light in avacuum is 300000 kms If the index ofrefraction of water is 133 what is thespeed of light in water

More Chapter Review gpesciencecom

1 Which of the following describes the imageformed by a convex mirror

A enlarged

B inverted

C real

D virtual

Use the figure below to answer question 2

2 Which of the following describes a light raythat passes through the focal point andthen is reflected by the mirror

A It travels parallel to the optical axis

B It forms a real image

C It is reflected back through the focal point

D It forms a virtual image

3 Why does an apple look red

A It reflects red light

B It absorbs red light

C It reflects green and blue light

D It reflects all colors of light except red

Use the figure below to answer questions 4 and 5

4 When the primary colors of light are addedtogether what color appears in area H

A cyan

B magenta

C white

D yellow

5 When the primary colors of light are addedtogether what color appears in area G

A cyan

B magenta

C white

D yellow

6 Which of the following increases as the fre-quency of a sound increases

A amplitude

B intensity

C loudness

D pitch

Red Blue

Green

F

H

G K

Focal pointOptical axis

350 STANDARDIZED TEST PRACTICE

Record your answers on the answer sheet provided by your teacher or on a sheet of paper

STANDARDIZED TEST PRACTICE 351

7 Which of the following parts of the eyeenable you to see colors in bright light

A cone cells

B cornea

C lens

D rod cells

Use the graph below to answer questions 8 and 9

8 Determine how far in centimeters theimage is from the lens when the object is15 centimeters from the lens

9 How far in centimeters is the object fromthe lens when the image distance andobject distance are equal

10 A shirt has stripes that are black and whitein white light If green light shines on thisshirt what colors will the black and whitestripes be

11 If you are on a moving train what hap-pens to the pitch of a crossing bell as youapproach the crossing and then moveaway from the crossing

Use the figure below to answer question 12

12 Describe the vision problem show by thefigure and explain how this vision prob-lem can be corrected

13 Explain why the human eye can see colorsbetter in bright light than in dim light

Image Distance fora Convex Lens

Ima

ge

dis

tan

ce (

cm)

30

25

20

15

10

5 10 15 20 25 30

Object distance (cm)

Standardized Test Practice gpesciencecom

Note Units Read carefully and make note of the units used in

any measurement

  • Glencoe Physical Science with Earth Science
    • Student Edition Table of Contents
      • Unit 1 Science and Technology
        • Chapter 1 The Nature of Science
          • Launch Lab Understanding Measurements
          • Foldables
          • Section 1 The Methods of Science
            • Science Online
            • Integrate History
            • Integrate Earth Science
            • Science Online
              • Section 2 Standards of Measurement
                • Applying Math Centimeters
                • Integrate Earth Science
                • Science Online
                • MiniLAB Determining the Density of a Pencil
                • Visualizing SI Dimensions
                  • Section 3 Communicating with Graphs
                    • Applying Math Temperature
                    • MiniLAB Graphing Temperature Change
                    • Lab Whats my graph
                    • Lab Design Your Own - Developing a Measurement System
                    • Science and Language Arts Thinking in Pictures and Other Reports from My Life with Autism
                      • Chapter 1 Study Guide
                      • Chapter 1 Review
                      • Chapter 1 Standardized Test Practice
                        • Chapter 2 Science Technology and Society
                          • Lab Technology in Your Life
                          • Foldables
                          • Section 1 Science and Technology
                            • MiniLAB Researching the Past
                            • Visualizing Technology Supplying Basic Needs
                            • Science Online
                              • Section 2 Forces that Shape Technology
                                • MiniLAB Evaluating the Benefits and Consequences of Technology
                                • Integrate Environment
                                • Integrate History
                                • Applying Science What impact does the accident at Chernobyl have on the future of nuclear power
                                • Science Online
                                • Lab Who contributes CO2
                                  • Section 3 Developing Technology
                                    • Integrate Life Science
                                    • Integrate Career
                                    • Lab Model and Invent - Care Package
                                    • Oops Accidents in Science A Slippery Situation
                                      • Chapter 2 Study Guide
                                      • Chapter 2 Review
                                      • Chapter 2 Standardized Test Practice
                                          • Unit 2 Motion Forces and Energy
                                            • Chapter 3 Motion Acceleration and Forces
                                              • Launch Lab Compare Speeds
                                              • Foldables
                                              • Section 1 Describing Motion
                                                • MiniLAB Measuring Average Speed
                                                • Science Online
                                                • Applying Math Average Speed
                                                • Integrate Astronomy
                                                • Science Online
                                                  • Section 2 Acceleration
                                                    • Integrate History
                                                    • Visualizing Acceleration
                                                      • Section 3 Motion and Forces
                                                        • Science Online
                                                        • MiniLAB Comparing Friction
                                                        • Lab Force and Acceleration
                                                        • Lab Design Your Own - Comparing Motion from Different Forces
                                                        • Science and Language Arts A Brave and Startling Truth
                                                          • Chapter 3 Study Guide
                                                          • Chapter 3 Review
                                                          • Chapter 3 Standardized Test Practice
                                                            • Chapter 4 The Laws of Motion
                                                              • Launch Lab The Force of Gravity
                                                              • Foldables
                                                              • Section 1 The First Two Laws of Motion
                                                                • MiniLAB Observing Inertia
                                                                • Science Online
                                                                • Applying Math The Acceleration of a Sled Solve a Simple Equation
                                                                  • Section 2 Gravity
                                                                    • Science Online
                                                                    • Integrate Earth Science
                                                                    • MiniLAB Observing Centripetal Force
                                                                    • Lab Gravity and Air Resistance
                                                                      • Section 3 The Third Law of Motion
                                                                        • Integrate Career
                                                                        • Visualizing Rocket Motion
                                                                        • Applying Math The Momentum of a Sprinter
                                                                        • Lab The Momentum of Colliding Objects
                                                                        • Science and History Newton and the Plague
                                                                          • Chapter 4 Study Guide
                                                                          • Chapter 4 Review
                                                                          • Chapter 4 Standardized Test Practice
                                                                            • Chapter 5 Energy
                                                                              • Launch Lab Energy Conversions
                                                                              • Foldables
                                                                              • Section 1 The Nature of Energy
                                                                                • Science Online
                                                                                • Applying Math Kinetic Energy
                                                                                • MiniLAB Interpreting Data from a Slingshot
                                                                                • Integrate Language Arts
                                                                                • Applying Math Gravitational Potential Energy
                                                                                • Lab Bouncing Balls
                                                                                  • Section 2 Conservation of Energy
                                                                                    • Visualizing Energy Transformations
                                                                                    • Integrate Environment
                                                                                    • MiniLAB Transforming Energy in a Paper Clip
                                                                                    • Science Online
                                                                                    • Integrate Health
                                                                                    • Lab Design Your Own - Swinging Energy
                                                                                    • Science and History The Impossible Dream
                                                                                      • Chapter 5 Study Guide
                                                                                      • Chapter 5 Review
                                                                                      • Chapter 5 Standardized Test Practice
                                                                                        • Chapter 6 Work and Machines
                                                                                          • Launch Lab Doing Work with a Simple Machine
                                                                                          • Foldables
                                                                                          • Section 1 Work
                                                                                            • Integrate Language Arts
                                                                                            • Applying Math Work
                                                                                            • MiniLAB Calculating Your Work and Power
                                                                                            • Applying Math Power
                                                                                              • Section 2 Using Machines
                                                                                                • MiniLAB Machines Multiplying Force
                                                                                                • Science Online
                                                                                                • Integrate Chemistry
                                                                                                  • Section 3 Simple Machines
                                                                                                    • Integrate History
                                                                                                    • Visualizing Levers in the Human Body
                                                                                                    • Science Online
                                                                                                    • Lab Levers
                                                                                                    • Lab Model and Invent - Using Simple Machines
                                                                                                    • Science and Society The Science of Very Very Small
                                                                                                      • Chapter 6 Study Guide
                                                                                                      • Chapter 6 Review
                                                                                                      • Chapter 6 Standardized Test Practice
                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                          • Launch Lab Relative Sizes of Earth the Moon and the Sun
                                                                                                          • Foldables
                                                                                                          • Section 1 Earth in Space
                                                                                                            • Science Online
                                                                                                            • Integrate Physics
                                                                                                              • Section 2 Time and Seasons
                                                                                                                • MiniLAB Modeling the Suns Rays at Solstice
                                                                                                                • Lab Comparing the Angle of Sunlight to Intensity
                                                                                                                  • Section 3 Earths Moon
                                                                                                                    • Applying Math Tides
                                                                                                                    • MiniLAB Modeling Phases and Eclipses
                                                                                                                    • Integrate History
                                                                                                                    • Integrate History
                                                                                                                    • Science Online
                                                                                                                    • Visualizing Water on the Moon
                                                                                                                    • Lab Identifying the Moons Surface Features and Apollo Landing Sites
                                                                                                                    • Oops Accidents in Science Even Great Scientists Make Mistakes
                                                                                                                      • Chapter 7 Study Guide
                                                                                                                      • Chapter 7 Review
                                                                                                                      • Chapter 7 Standardized Test Practice
                                                                                                                        • Chapter 8 The Solar System
                                                                                                                          • Launch Lab The Size of the Solar System
                                                                                                                          • Foldables
                                                                                                                          • Section 1 Planet Motion
                                                                                                                            • Integrate History
                                                                                                                            • MiniLAB Plotting Retrograde Motion
                                                                                                                            • Integrate Physics
                                                                                                                            • Applying Math Heliocentric Longitude (HL)
                                                                                                                              • Section 2 The Inner Planets
                                                                                                                                • Science Online
                                                                                                                                • Integrate Chemistry
                                                                                                                                • Lab Interpreting Features of Marss Surface
                                                                                                                                  • Section 3 The Outer Planets
                                                                                                                                    • Integrate Language Arts
                                                                                                                                    • Visualizing What Galileo Saw
                                                                                                                                    • Science Online
                                                                                                                                    • MiniLAB Comparing Sizes of Outer and Inner Planets
                                                                                                                                      • Section 4 Life in the Solar System
                                                                                                                                        • Lab Design Your Own - Testing Unknown Soil Samples for Life
                                                                                                                                        • Science Stats Night Sky Wonders
                                                                                                                                          • Chapter 8 Study Guide
                                                                                                                                          • Chapter 8 Review
                                                                                                                                          • Chapter 8 Standardized Test Practice
                                                                                                                                              • Unit 3 Energy in Motion
                                                                                                                                                • Chapter 9 Heat and States of Matter
                                                                                                                                                  • Launch Lab Expansion of a Gas
                                                                                                                                                  • Foldables
                                                                                                                                                  • Section 1 Temperature and Thermal Energy
                                                                                                                                                    • Applying Math Converting to Celsius
                                                                                                                                                    • Science Online
                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                    • Applying Math Change in Thermal Energy
                                                                                                                                                      • Section 2 States of Matter
                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                        • Science Online
                                                                                                                                                        • MiniLAB Comparing States of Water
                                                                                                                                                          • Section 3 Transferring Thermal Energy
                                                                                                                                                            • MiniLAB Comparing Thermal Conductors
                                                                                                                                                            • Visualizing Convection Currents
                                                                                                                                                            • Lab Convection in Gases and Liquids
                                                                                                                                                              • Section 4 Using Thermal Energy
                                                                                                                                                                • Integrate History
                                                                                                                                                                • Science Online
                                                                                                                                                                • Lab Conduction in Gases
                                                                                                                                                                • Science Stats Surprising Thermal Energy
                                                                                                                                                                  • Chapter 9 Study Guide
                                                                                                                                                                  • Chapter 9 Review
                                                                                                                                                                  • Chapter 9 Standardized Test Practice
                                                                                                                                                                    • Chapter 10 Waves
                                                                                                                                                                      • Launch Lab How do waves transfer energy
                                                                                                                                                                      • Foldables
                                                                                                                                                                      • Section 1 The Nature of Waves
                                                                                                                                                                        • Visualizing Formation of Ocean Waves
                                                                                                                                                                        • Science Online
                                                                                                                                                                          • Section 2 Wave Properties
                                                                                                                                                                            • MiniLAB Observing Wavelength
                                                                                                                                                                            • Integrate Social Studies
                                                                                                                                                                            • Applying Math The Speed of Sound
                                                                                                                                                                            • Lab Wave Speed and Tension
                                                                                                                                                                              • Section 3 The Behavior of Waves
                                                                                                                                                                                • Science Online
                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                • MiniLAB Experimenting with Resonance
                                                                                                                                                                                • Lab Measuring Wave Properties
                                                                                                                                                                                • Science and History Making Waves
                                                                                                                                                                                  • Chapter 10 Study Guide
                                                                                                                                                                                  • Chapter 10 Review
                                                                                                                                                                                  • Chapter 10 Standardized Test Practice
                                                                                                                                                                                    • Chapter 11 Sound and Light
                                                                                                                                                                                      • Launch Lab What sound does a ruler make
                                                                                                                                                                                      • Foldables
                                                                                                                                                                                      • Section 1 Sound
                                                                                                                                                                                        • MiniLAB Comparing Intensity
                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                        • Science Online
                                                                                                                                                                                        • Applying Math Using Sonar
                                                                                                                                                                                          • Section 2 Reflection and Refraction of Light
                                                                                                                                                                                          • Section 3 Mirrors Lenses and the Eye
                                                                                                                                                                                            • Visualizing Images Formed by a Convex Lens
                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                            • MiniLAB Experimenting with Focal Lengths
                                                                                                                                                                                            • Lab Reflections of Reflections
                                                                                                                                                                                              • Section 4 Light and Color
                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Lab Design Your Own - Blocking Noise Pollution
                                                                                                                                                                                                • Science and Language Arts A Haiku Garden The Four Seasons in Poems and Print
                                                                                                                                                                                                  • Chapter 11 Study Guide
                                                                                                                                                                                                  • Chapter 11 Review
                                                                                                                                                                                                  • Chapter 11 Standardized Test Practice
                                                                                                                                                                                                    • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                      • Launch Lab Global Jigsaw Puzzle
                                                                                                                                                                                                      • Foldables
                                                                                                                                                                                                      • Section 1 Evolution of Earths Crust
                                                                                                                                                                                                        • Applying Math Spreading Distances
                                                                                                                                                                                                        • Integrate Physics
                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                          • Section 2 Earthquakes
                                                                                                                                                                                                            • MiniLAB Demonstrating Four Types of Stress
                                                                                                                                                                                                            • Visualizing Earthquake-Proof Buildings
                                                                                                                                                                                                              • Section 3 Earths Interior
                                                                                                                                                                                                              • Section 4 Volcanoes
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • MiniLAB Modeling Lava Viscosity
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                • Lab A Case for Pacific Plate Motion
                                                                                                                                                                                                                • Lab Earthquake Earthquake Wheres the earthquake
                                                                                                                                                                                                                • Science and History Volcano Weather
                                                                                                                                                                                                                  • Chapter 12 Study Guide
                                                                                                                                                                                                                  • Chapter 12 Review
                                                                                                                                                                                                                  • Chapter 12 Standardized Test Practice
                                                                                                                                                                                                                      • Unit 4 Forms of Energy
                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                          • Launch Lab Electric Circuits
                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                          • Section 1 Electric Charge
                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                            • Visualizing Lightning
                                                                                                                                                                                                                            • MiniLAB Investigate Charged Objects
                                                                                                                                                                                                                              • Section 2 Electric Current
                                                                                                                                                                                                                                • MiniLAB Investigating Battery Addition
                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                • Lab Identifying Conductors and Insulators
                                                                                                                                                                                                                                  • Section 3 Electrical Energy
                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                    • Applying Math Power Used by a Clothes Dryer
                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                    • Applying Math Electrical Energy Used by a Microwave Oven
                                                                                                                                                                                                                                    • Lab Design Your Own - Comparing Series and Parallel Circuits
                                                                                                                                                                                                                                    • Science and Language Arts Invisible Man
                                                                                                                                                                                                                                      • Chapter 13 Study Guide
                                                                                                                                                                                                                                      • Chapter 13 Review
                                                                                                                                                                                                                                      • Chapter 13 Standardized Test Practice
                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                          • Launch Lab The Strength of Magnets
                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                          • Section 1 Magnetism
                                                                                                                                                                                                                                            • MiniLAB Observing Magnetic Interference
                                                                                                                                                                                                                                            • Integrate Earth Science
                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                            • Applying Science How can magnetic parts of a junk car be salvaged
                                                                                                                                                                                                                                            • MiniLAB Making Your Own Compass
                                                                                                                                                                                                                                              • Section 2 Electricity and Magnetism
                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                  • Section 3 Producing Electric Current
                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                    • Visualizing Motors and Generators
                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                    • Lab Electricity and Magnetism
                                                                                                                                                                                                                                                    • Lab Design Your Own - Controlling Electromagnets
                                                                                                                                                                                                                                                    • Science and History Body Art
                                                                                                                                                                                                                                                      • Chapter 14 Study Guide
                                                                                                                                                                                                                                                      • Chapter 14 Review
                                                                                                                                                                                                                                                      • Chapter 14 Standardized Test Practice
                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                          • Launch Lab Can electromagnetic waves change materials
                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                          • Section 1 What are electromagnetic waves
                                                                                                                                                                                                                                                            • MiniLAB Investigating Electromagnetic Waves
                                                                                                                                                                                                                                                            • Applying Math The Speed of Light in Water
                                                                                                                                                                                                                                                              • Section 2 The Electromagnetic Spectrum
                                                                                                                                                                                                                                                                • MiniLAB Heating with Microwaves
                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                • Lab The Shape of Satellite Dishes
                                                                                                                                                                                                                                                                  • Section 3 Radio Communication
                                                                                                                                                                                                                                                                    • Visualizing Radio Broadcasts
                                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Lab Use the Internet - Radio Frequencies
                                                                                                                                                                                                                                                                    • Science and History Riding a Beam of Light
                                                                                                                                                                                                                                                                      • Chapter 15 Study Guide
                                                                                                                                                                                                                                                                      • Chapter 15 Review
                                                                                                                                                                                                                                                                      • Chapter 15 Standardized Test Practice
                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                          • Launch Lab Heating with Solar Energy
                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                          • Section 1 Fossil Fuels
                                                                                                                                                                                                                                                                            • Visualizing The Formation of Fossil Fuels
                                                                                                                                                                                                                                                                            • MiniLAB Designing an Efficient Water Heater
                                                                                                                                                                                                                                                                              • Section 2 Nuclear Energy
                                                                                                                                                                                                                                                                                • Integrate Earth Science
                                                                                                                                                                                                                                                                                • Integrate Social Science
                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                • Applying Science Can a contaminated radioactive site be reclaimed
                                                                                                                                                                                                                                                                                  • Section 3 Renewable Energy Sources
                                                                                                                                                                                                                                                                                    • MiniLAB Using Solar Power at Home
                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                    • Lab Solar Heating
                                                                                                                                                                                                                                                                                    • Lab Use the Internet How much does energy really cost
                                                                                                                                                                                                                                                                                    • Science and Society Reacting to Nuclear Energy
                                                                                                                                                                                                                                                                                      • Chapter 16 Study Guide
                                                                                                                                                                                                                                                                                      • Chapter 16 Review
                                                                                                                                                                                                                                                                                      • Chapter 16 Standardized Test Practice
                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                          • Lab Atmospheric Pressure
                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                          • Section 1 Earths Atmosphere
                                                                                                                                                                                                                                                                                            • MiniLAB Visualizing Convection
                                                                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                                                                            • Lab Visualizing a Temperature Inversion
                                                                                                                                                                                                                                                                                              • Section 2 Weather
                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Coriolis Effect
                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                  • Section 3 Climate
                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                    • Visualizing Earths Biogeophysical System
                                                                                                                                                                                                                                                                                                      • Section 4 Earths Changing Climates
                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                        • Applying Math Carbon Dioxide (CO2) Concentration
                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Investigating Microclimate
                                                                                                                                                                                                                                                                                                        • Science and Language Arts The Grapes of Wrath
                                                                                                                                                                                                                                                                                                          • Chapter 17 Study Guide
                                                                                                                                                                                                                                                                                                          • Chapter 17 Review
                                                                                                                                                                                                                                                                                                          • Chapter 17 Standardized Test Practice
                                                                                                                                                                                                                                                                                                              • Unit 5 Matter and Earth Materials
                                                                                                                                                                                                                                                                                                                • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                  • Launch Lab Demonstrate the Distillation of Water
                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                  • Section 1 Composition of Matter
                                                                                                                                                                                                                                                                                                                    • Visualizing Elements
                                                                                                                                                                                                                                                                                                                    • MiniLAB Classifying Materials
                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                    • Lab Comparing Pure Substances and Mixtures
                                                                                                                                                                                                                                                                                                                      • Section 2 Properties of Matter
                                                                                                                                                                                                                                                                                                                        • Integrate Environment
                                                                                                                                                                                                                                                                                                                        • MiniLAB Separating Ink
                                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                                        • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                        • Applying Math The Law of Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Measuring the Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Science Stats Intriguing Elements
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Study Guide
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Review
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                            • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                              • Launch Lab Inferring What You Cant Observe
                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                              • Section 1 Structure of the Atom
                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling an Aluminum Atom
                                                                                                                                                                                                                                                                                                                                • Visualizing The Atomic Model
                                                                                                                                                                                                                                                                                                                                  • Section 2 Masses of Atoms
                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                    • Applying Science How can radioactive isotopes help tell time
                                                                                                                                                                                                                                                                                                                                      • Section 3 The Periodic Table
                                                                                                                                                                                                                                                                                                                                        • MiniLAB Organizing a Personal Periodic Table
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Career
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                                                                                                                                                                        • Lab A Periodic Table of Foods
                                                                                                                                                                                                                                                                                                                                        • Lab Use the Internet Whats in a name
                                                                                                                                                                                                                                                                                                                                        • Science and History A Chilling Story
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Study Guide
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Review
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                            • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                              • Launch Lab Earth Materials at Home and School
                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                              • Section 1 Minerals
                                                                                                                                                                                                                                                                                                                                                • MiniLAB Identifying Salts Crystal System
                                                                                                                                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                • Lab Be a Mineral Detective
                                                                                                                                                                                                                                                                                                                                                  • Section 2 Igneous Rocks
                                                                                                                                                                                                                                                                                                                                                    • Applying Math Extrusive Igneous Rock Classification
                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                      • Section 3 Sedimentary Rocks
                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Evaporites
                                                                                                                                                                                                                                                                                                                                                          • Section 4 Metamorphic Rocks and the Rock Cycle
                                                                                                                                                                                                                                                                                                                                                            • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                            • Visualizing Shock Metamorphic Rock
                                                                                                                                                                                                                                                                                                                                                            • Lab Identifying Rocks
                                                                                                                                                                                                                                                                                                                                                            • Science and Society Earth Materials at Work
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Study Guide
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Review
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                  • Launch Lab Have you got the time
                                                                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                                                                  • Section 1 Weathering and Soil
                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing a Disappearing Seasoning
                                                                                                                                                                                                                                                                                                                                                                    • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                    • Lab Graphing Soil Textures
                                                                                                                                                                                                                                                                                                                                                                      • Section 2 Shaping the Landscape
                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Runoff
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                          • Section 3 Groundwater
                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Porosity Volume
                                                                                                                                                                                                                                                                                                                                                                            • Visualizing The Role of Groundwater in Shaping Earths Surface
                                                                                                                                                                                                                                                                                                                                                                            • Integrate Environment
                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                              • Section 4 Geologic Time
                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                                                                                                • Lab Its about time - relative that is
                                                                                                                                                                                                                                                                                                                                                                                • Science and Society Tapping into the Underground
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Review
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                      • Unit 6 Interactions of Matter
                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                          • Lab Chemical Bonds and Mixing
                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Stability in Bonding
                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                            • Lab Atomic Trading Cards
                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Types of Bonds
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Observing a Bond Type
                                                                                                                                                                                                                                                                                                                                                                                                • Visualizing Polar Molecules
                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Writing Formulas and Naming Compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math Determining a Formula
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Science Can you name binary ionic compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Making a Hydrate
                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Model and Invent - Modeling Chemical Bonding
                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Sticky Subject
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Review
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab RustingmdashA Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Chemical Changes
                                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Designing a Team Equation
                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Chemical Equations
                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math Barium Sulfate Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Classifying Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 4 Reaction Rates and Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing Chemical Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Creating a Colorful Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab To Glow or Not to Glow
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Investigating Reaction Conditions
                                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Clumsy Move Pays Off
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Review
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab Magic Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 How Solutions Form
                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                                                                                                                                                                                                                                                            • Visualizing Metal Alloys
                                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Observing the Effect of Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Solubility and Concentration
                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Acids Bases and Salts
                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing Acid Relief
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
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                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Strength of Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Determining Acidity
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                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and Society Acid Rain
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Study Guide
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                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Nuclear Decay
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Detecting Radioactivity
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                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Social Studies
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                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Chain Reactions
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                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and History The Nuclear Alchemist
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                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Observing the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling a Telescope
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Page 5: 706 S1 318-326 GPS09 - Light-and-Sound - home · PDF fileWhat sound does a ruler make? ... sound waves cannot travel in empty space where there are no particles. ... sound travels

Intensity and LoudnessImagine you are listening to music from your CD player

Sound waves produced by the CD player travel through the airand transfer energy from the CD player to your ears The energythat reaches your ears depends not only on the amplitude of thesound waves but also on how close you are to the CD playerFigure 3 shows that as you get farther from a source of soundthe energy of the sound waves is spread over a greater area Theamount of energy transferred by a sound wave through a certainarea each second is the intensity of the sound wave As soundwaves travel away from the source of the sound the intensity ofthe waves decreases as the waves spread out This means that asyou get farther from the source less energy reaches your earseach second

Loudness When you hear different sounds you do not needspecial equipment to know which sounds have greater intensityYour ears and brain can tell the difference Loudness is thehuman perception of sound intensity As the intensity of asound wave increases the loudness of the sound also increases

How are intensity and loudness related

A Scale for Sound Intensity The intensity of sound can bedescribed using a measurement scale Each unit on the scale forsound intensity is called a decibel abbreviated dB On this scalethe faintest sound that most people can hear is 0 dB Soundswith intensity levels above 120 dB may cause pain and perma-nent hearing loss During some rock concerts sounds reach thisdamaging intensity level Wearing ear protection such asearplugs around loud sounds can help protect against hearingloss Figure 4 shows some sounds and their intensity levels indecibels

Figure 4 The decibel scale meas-

ures the intensity of sound

Identify where a normal speakingvoice would fall on the scale

Figure 3 The intensity of a

sound wave decreases as the wave

spreads out from the source of the

sound The energy of the wave is

spread over a larger area as the

wave spreads out

Whisper

Rustling

leaves

Noisy

restaurant

20 25 50 75 80 100 110 12015

Purring

cat

Average

home

Vacuum

cleaner

Jet plane

taking off

Power

mowerPain

threshold

0dB 150

Loudness in Decibels

322 CHAPTER 11 Sound and Light

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SECTION 1 Sound 323

Pitch and FrequencyYou might be familiar with the music

scale do re mi fa sol la ti do shown inFigure 5 If you were to sing this scale youwould hear the pitch of your voice gethigher Pitch is the human perception ofthe frequency of sound waves Pitch getshigher as the frequency of the sound wavesincreases

Frequency Frequency is a measure of how many wavelengthspass a particular point each second For a compressional wavesuch as sound the frequency is the number of compressions orthe number of rarefactions that pass by each second Frequencyis measured in hertz (Hz) A frequency of 1 Hz means that onecomplete wavelength passes by in 1 s

A healthy human ear can hear sound waves with frequenciesfrom about 20 Hz to 20000 Hz The human ear is most sensi-tive to sounds in the range of 440 Hz to about 7000 Hz In thisrange most people can hear much fainter sounds than they canat higher or lower frequencies

Ultrasonic and Infrasonic Waves Most people canrsquot hearsound frequencies above 20000 Hz which are called ultrasonicwaves Dogs can hear sounds with frequencies up to about35000 Hz and bats can detect frequencies higher than 100000Hz Even though humans canrsquot hear ultrasonic waves they havea number of uses For example ultrasonic waves directed intothe human body are used in medical diagnosis and treatmentUltrasonic waves are reflected by objects underwater and can beused to determine the size shape and depth of underwaterobjects

Infrasonic or subsonic waves have frequencies below20 Hzmdashtoo low for most people to hear These waves are pro-duced by sources that vibrate slowly such as wind heavymachinery and earthquakes Although you canrsquot hear infrasonicwaves you might feel them as a rumble inside your body

The Doppler EffectImagine that you are standing at the side of a racetrack with

race cars zooming past As they move toward you the pitches oftheir engines become higher As they move away the pitchesbecome lower The change in pitch or frequency due to therelative motion of a wave source is called the Doppler effect

Figure 5 Every note has a

different frequency which gives it

a distinct pitch

Describe how pitch changes whenfrequency increases

C

do

262

Hz

D

re

294

Hz

E

mi

330

Hz

F

fa

349

Hz

G

sol

392

Hz

A

la

440

Hz

B

ti

494

Hz

C

do

523

Hz

Comparing IntensityProcedure 1 Complete the safety form

2 Tie the middle of a 50-cm

length of string to a metal

object such as a spoon3 Wrap each end of the

string around a finger on

each hand Place one of

these fingers in each ear

4 Swing the object so it

bumps against a table or

a chair Note the sound

5 Take your fingers out of

your ears and repeat

step 4

Analysis1 Compare the sounds you

heard in both trials

2 Compare the intensity of

the sound waves that

reached your

ears in both

trials

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324 CHAPTER 11 Sound and Light

A Moving Source of Sound As a race car moves it producessound waves in the form of compressions and rarefactions InFigure 6A the race car creates a compression labeled ACompression A moves through the air toward the flagger By thetime compression B leaves the race car in Figure 6B the car hasmoved forward Because the car has moved since the time it createdcompression A compressions A and B are closer together in frontof the car than they would be if the car had stayed still Because thecompressions are closer together more compressions pass by theflagger each second than if the car had been at rest As a result theflagger hears a higher pitch Figure 6B also shows that the compres-sions behind the moving car are farther apart resulting in a lowerfrequency The flagger hears a lower pitch after the car passes

A Moving Listener You also can hear the Doppler effect whenyou are moving past a sound source that is standing still Supposeyou were riding in a school bus and passed a building with a ring-ing bell The pitch would become higher as you approached thebuilding and lower as you rode away from it The Doppler effecthappens any time the source of a sound is changing position rel-ative to the listener It occurs no matter whether it is the soundsource or the listener that is moving The faster the change inposition the greater the change in frequency and pitch

How does pitch change if you are moving awayfrom a sound source

The race car creates compression A which

spreads through the air in all directions from the

point where it was created

The car is closer to the flagger when it creates

compression B Compressions A and B are closer

together in front of the car so the flagger hears a

higher-pitched sound

Figure 6 The Doppler effect occurs when the

source of a sound wave is moving relative to a

listener

Compression A

Compression B

Compression A

Red Shift The Dopplereffect can also beobserved in light wavesemanating from movingsourcesmdashalthough thesources must be movingat tremendous speedsAstronomers have learnedthat the universe isexpanding by observingthe Doppler effect in lightwaves Research thephenomenon known asred shift and explain inyour Science Journal howit relates to the Dopplereffect

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SECTION 1 Sound 325

Using SoundWhen sound waves strike an object they can be absorbed by

the object transmitted through the object or reflected from theobject By detecting the sound waves reflected from an objectthe size shape and location of an object can be determined

Echolocation and Sonar Some species of bats as well asdolphins whales and other animals use sound waves to detecttheir prey Echolocation is the process of locating objects byemitting sounds and detecting the sound waves that reflect back

Sonar is a system that uses the reflection of underwater soundwaves to detect objects First a sound pulse is emitted underwa-ter The sound waves travel in the water and are reflected whenthey strike an object such as a fish or a ship An underwatermicrophone detects the reflected waves Because the speed ofsound in water is known the distance to the object can be calcu-lated by measuring how much time passes between when thesound pulse is emitted and when the reflected signal is received

USING SONAR A sonar pulse returns in 300 s from a sunken ship that is directly below Find

the depth of the ship if the speed of the pulse is 1500 ms Hint The sonar pulse travels a

distance equal to twice the depth of the ship so use the equation d = st2 to find the depth

known values and the unknown value

Identify the known values

speed of sound in water s 1500 ms

time for round trip t 300 s

Identify the unknown value

depth of the ship d m

the problem

Substitute the known values s 1500 ms and t 300 s into the equation for depth

d s2t

(1500 m2s)(300 s)

12

(4500 m) 2250 m

your answer

Check your answer by dividing the distance by the time and multiplying by 2 The result

should be the speed of sound given in the problem

CHECK

SOLVE

means

means

means

IDENTIFY

Solve a Simple Equation

Find the speed of a sonar pulse that returns in 20 s from a ship at a depth of 1500 m

For more practice problems go to page 879 and visit Math Practice at gpesciencecom

Topic SonarVisit for Web

links to information about ways

sonar is used

Activity Research to find out

the different types of sonar Make

a poster that describes active and

passive sonar

gpesciencecom

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326 CHAPTER 11 Sound and Light

Self Check

1 Explain how sound travels from your vocal cords to

your friendrsquos ears when you talk

2 Explain how the loudness of a sound wave depends on

the intensity of the sound wave

3 Draw and label a diagram that explains the Doppler

effect

4 Describe at least three uses of ultrasonic technology in

medicine

5 Think Critically How could sonar technology be used

to locate deposits of oil and minerals

Summary

Sound Waves

bull Sound waves are compressional waves that

are produced by vibrating objects

bull Sound usually travels fastest in solids and

slowest in gases

bull Sound travels faster as the temperature of

the medium increases

Properties of Sound

bull The amplitude of sound waves increases as

the density of particles increases in the com-

pressions and decreases in rarefactions

bull Loudness is the human perception of the

intensity of sound waves Pitch is the human

perception of the frequency of sound waves

bull The Doppler effect is the change in the fre-

quency of a sound wave when the source of

the sound is moving relative to a listener

6 Calculate Time How long would it take a sound

wave from a car alarm to travel 10 km in air if the air

temperature were 0degC

7 Calculate Distance If sound travels in the ocean with

a speed of 1500 ms how far will a sonar pulse travel

in 45 s

Ultrasound in Medicine High-frequency soundwaves can also be used to remove dirt buildup on jew-elry and glassware One of the most important uses ofultrasonic waves though is in medicine Using spe-cial instruments medical professionals can sendultrasonic waves into a specific part of a patientrsquosbody Reflected ultrasonic waves are used to examinedifferent body parts and to detect and monitor cer-tain types of heart disease and cancer Ultrasoundimaging also is used to monitor the development of afetus as shown in Figure 7 However ultrasound doesnot produce good images of the bones and lungsbecause hard tissues and air absorb the ultrasonicwaves instead of reflecting them

High-frequency sound waves can be used to treatcertain medical problems For example sometimes small harddeposits of calcium compounds or other minerals form in thekidneys making kidney stones In the past physicians had toperform surgery to remove kidney stones Now ultrasonic treat-ments are commonly used to break them up instead Bursts ofultrasound create vibrations that cause the stones to break intosmall pieces that can easily pass out of the body with the urineA similar treatment is available for gallstones

Figure 7 Ultrasonic waves are

directed into a pregnant womanrsquos

uterus to form images of her fetus

More Section Review gpesciencecom

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Opaque

Translucent

Transparent

SECTION 2 Reflection and Refraction of Light 327

The Interaction of Light and MatterLook around your darkened room at night You know that

some of the objects are brightly colored but they look gray orblack in the dim light Turn on the light and you can see all theobjects in the room clearly including their colors What you seedepends on the amount of light in the room and the color of theobjects For you to see an object it must reflect or emit somelight that reaches your eyes

Absorption Transmission and Reflection Objects canabsorb light reflect light and transmit lightmdashallow light to passthrough them The type of matter in an object determines theamount of light it absorbs reflects and transmits For examplethe opaque material in the top candleholder in Figure 8 onlyabsorbs and reflects lightmdashno light passes through it As a resultyou cannot see the candle inside Materials that allow some lightto pass through them like the material of the middle candle-holder in Figure 8 are described as translucent You cannot seeclearly through translucent materials

Transparent materials such as the bottom candleholder inFigure 8 transmit almost all the light striking them so you cansee objects clearly through them Only a small amount of lightis absorbed and reflected by transparent materials

Reflection andRefraction of Light

Reading Guide

Describe how light waves interact

with matter Explain the difference between

regular and diffuse reflection Define the index of refraction of a

material Explain why a prism separates

white light into different colors

The images you see every day are

due to the behavior of light waves

Review Vocabulary

visible light an electromagnetic

wave with wavelengths between

about 400 and 700 billionths of a

meter

New Vocabulary

bull opaque

bull translucent

bull transparent

bull index of refraction

Figure 8 These candleholders

interact with light differently

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328 CHAPTER 11 Sound and Light

Reflection of LightHave you glanced in a mir-

ror today You see your reflec-tion in the mirror when light isreflected off you strikes themirror and is reflected off themirror into your eye Becauselight behaves as a wave itobeys the law of reflection asshown in Figure 9 Recall thataccording to the law of reflec-tion the angle at which a lightwave strikes a surface is thesame as the angle at which it is

reflected Light reflected from any surfacemdasha mirror or a sheetof papermdashobeys this law

Regular and Diffuse Reflection Why can you see yourreflection in a store window but not in a sheet of paper Theanswer has to do with the smoothness of the surfaces A smootheven surface such as a pane of glass produces a sharp image byreflecting parallel light waves in only one direction Reflection oflight waves from a smooth surface is regular reflection To causea regular reflection the roughness of a surface must be less thanthe wavelengths it reflects A sheet of paper has an uneven sur-face that causes incoming parallel light waves to be reflected inmany directions as shown in Figure 10 Reflection of light froma rough surface is diffuse reflection

Scattering Diffuse reflection is a type of scattering thatoccurs when light waves traveling in one direction are made totravel in many different directions Scattering also occurs whenlight waves traveling through the air reflect off small particlesAn example is light scattering off the small water droplets thatmake up a cloud Scattering causes the cloud to appear whiteeven though the droplets are transparent

What is scattering of light

Figure 9 According to the law of

reflection light is reflected so that

the angle of incidence always

equals the angle of reflection

Figure 10 A sheet of paper

has an uneven surface that

produces a diffuse reflection

Explain Use the law ofreflection to explain why arough surface causes parallellight waves to be reflected inmany directions

Mirror

i = angle of

incidence

i

r

i

r

r = angle of

reflection

Normal

Normal

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Refraction of LightWhat occurs when a light wave passes from one material to

anothermdashfrom air to water for example Recall that refractionis caused by a change in the speed of a wave when it passes fromone material to another If the light wave is traveling at an angleto the boundary between the materials and the speed of light isdifferent in the two materials the wave will be bent or refracted

Why does refraction occur

The Index of Refraction The amount of bending that takesplace depends on the speeds of light in both materials Thegreater the change in speed the more the light will be bent asit passes at an angle from one material to the other Figure 11

shows an example of refraction Every material has an index ofrefraction which is the ratio of the speed of light in a vacuum tothe speed of light in the material The index of refraction indi-cates how much the speed of light is reduced in the materialcompared to its speed in empty space

The larger the index of refraction the more light is sloweddown in the material For example because glass has a largerindex of refraction than air light moves more slowly in glassthan air The index of refraction is usually largest for solids andsmallest for gases

Prisms A sparkling glass prism hangs in a sunny windowrefracting the sunlight and projecting a colorful pattern onto thewalls of the room How does the refraction of light create thesecolors The spectrum of colors is produced because the speed oflight in a material also depends on the wave-length of the light In a glass prism light waveswith longer wavelengths such as red light wavesare slowed less than light waves with shorterwavelengths such as blue light waves

Figure 12 shows what occurs when whitelight passes through a prism White light suchas sunlight is made up of light waves withrange of wavelengths from red to blue The tri-angular prism refracts the light twicemdashoncewhen it enters the prism and again when itleaves the prism and reenters the air Becausethe longer wavelengths of light are slowed lessthan the shorter wavelengths are red light isbent the least As a result of these differentamounts of bending the different colors areseparated when they emerge from the prism

Figure 11 The spoon looks

broken because light waves are

refracted as they change speed

when they pass from the water to

the air

329

Figure 12 Refraction causes a

prism to separate a beam of white

light into different colors

GPS+_329

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eng - iTunNORM 0000039D 00000000 000035C6 00000000 0000C58D 00000000 000060DD 00000000 0001DFCB 00000000

330 CHAPTER 11 Sound and Light

Self Check

1 Compare and contrast opaque transparent and

translucent materials Give one example of each

2 Discuss why you can see your reflection in a smooth

piece of aluminum foil but not in a crumpled ball of foil

3 Infer what happens to light waves that are reflected off

dust particles in the air

4 Explain what happens to white light when it passes

through a prism

5 Think Critically Suppose a material has the same index

of refraction as water How would a light wave change

direction as it traveled from water into this material

Summary

Light and Matter

bull The amount of light that is absorbed

reflected or transmitted depends on the

material making up the object

Reflection of Light

bull Light waves always obey the law of reflection

the angle of incidence equals the angle of

reflection

bull Regular reflection causes parallel light waves

to be reflected in only one direction

bull Diffuse reflection causes parallel light waves

to be reflected in many directions

bull Scattering occurs when light waves are reflected

and travel in many different directions

Refraction of Light

bull Refraction occurs when a light wave changes

speed in moving from one material to another

bull The index of refraction of a material indicates

how much light slows down in the material

6 Find an Angle A light wave strikes a mirror at an

angle of 42deg from the surface of the mirror What

angle does the reflected wave make with the normal

7 Find an Angle A light wave reflects from a mirror at

27deg from the normal What was the angle between

the mirror and the incident wave

Mirages When yoursquore traveling in a car you might see whatlooks like a pool of water on the road ahead As you get closerthe water seems to disappear Yoursquove seen a miragemdashan image ofa distant object produced by the refraction of light through airlayers of different densities Mirages result when the air atground level is much warmer or cooler than the air above asshown in Figure 13 The density of air increases as air cools andlight waves move slower in cooler air than in warmer air As aresult light waves are refracted as they pass through air layerswith different temperatures

Figure 13 Mirages result when

air near the ground is much

warmer or cooler than the air

above This causes light waves

reflected from an object to refract

creating one or more additional

images

MirageWarm air

Cool air

More Section Review gpesciencecom

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SECTION 3 Mirrors Lenses and the Eye 331

Light RaysLight sources send out light waves in all directions These

waves spread out like ripples on the surface of water spread outfrom the point of impact of a pebble You can think of the lightcoming from the source as being many narrow beams of light trav-eling in all directions Each narrow light beam is called a light ray

MirrorsA mirror is any surface that produces a regular reflection A pool

of still water a metal pan and even the back of a shiny spoon can bemirrors Mirrors can be flat curved inward or curved outward

Plane Mirrors A flat smooth mirror is a plane mirror Whenyou look in a plane mirror your image appears upright If youstand 1 m from the mirror your image appears 1 m behind themirror or 2 m from you In fact your image is what a friend stand-ing 2 m from you would see Figure 14 shows how your image isformed First light rays from a light source strike you Every pointthat is struck by the light rays reflects these rays so they travel out-ward in all directions If your friend were looking at you thesereflected light rays coming from you would enter her eyes so shecould see you However if a mirror is placed between you and yourfriend light rays are reflected from the mirror back to your eyes

Mirrors Lenses andthe Eye

Reading Guide

Describe how images are formed

by three types of mirrors Explain how convex and concave

lenses form images Explain how the human eye

enables you to see Describe how lenses are used to

correct vision problems

Mirrors and lenses are used in optical

instruments such as cameras and

telescopes

Review Vocabulary

reflection the process of changing

direction after striking a surface

New Vocabulary

bull plane mirror

bull concave mirror

bull convex mirror

bull convex lens

bull concave lens

Figure 14 Seeing an image of

yourself in a mirror involves two

sets of reflections light rays are

reflected from you and then are

reflected by the mirror

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332 CHAPTER 11 Sound and Light

Virtual and Real Images The forma-tion of an image by a plane mirror isshown in Figure 15 Your brain assumesthat light rays travel in a straight line As aresult rays that enter your eyes seem tocome from behind the mirror This makesthe image seem to be behind the mirrorHowever no light rays actually passthrough the place where the image seemsto be located This type of image is called avirtual image Plane mirrors always formvirtual images If light rays from an objectpass through the location of the image theimage is called a real image Curved mir-rors can form both real and virtual images

Concave Mirrors If the surface of a mirror is curved inwardit is called a concave mirror as shown in Figure 16 The opticalaxis is an imaginary straight line drawn perpendicular to thesurface of the mirror at its center Every light ray traveling par-allel to the optical axis is reflected through a point on the opti-cal axis called the focal point The distance from the center ofthe mirror to the focal point is called the focal length

The image formed by a concave mirror depends on the loca-tion of the object relative to the focal point Figure 16 shows acandle located more than twice the focal length from the mirrorAlthough many light rays come from each point on the candleonly two rays from the same point are shown Ray A passesthrough the focal point and then reflects off the mirror movingparallel to the optical axis Ray B travels parallel to the opticalaxis before reflecting off the mirror and passing through thefocal point The point where the two rays meet is the location ofthe image of the original point on the candle The image formedis a real image because light rays from the candle pass throughthe place where the image is located

Figure 16 Rays A and B start from the same

place on the candle travel in different directions

and meet again on the reflected image

Diagram how two other points on the image ofthe candle are formed

Figure 15 Your brain interprets

the light rays reflected by the

mirror as coming from a point

behind the mirror

Infer how the size of your imagein a plane mirror depends on yourdistance from the mirror

Focalpoint

Optical axis

Ray B

Ray A

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SECTION 3 Mirrors Lenses and the Eye 333

Images Produced by a ConcaveMirror When an object is between oneand two focal lengths from a concavemirror the image is real inverted andlarger than the object An object closerthan one focal length from a concavemirror produces a virtual image that isupright and larger than the object Noimage is produced if the object islocated at the focal point

Convex Mirrors When you are in astore look up toward one of the backcorners or at the end of an aisle to see ifa large rounded mirror is mountedthere You can see a large area of the store in such a mirror Amirror that curves outward like the back of a spoon is called aconvex mirror Light rays that hit a convex mirror diverge orspread apart after they are reflected Figure 17 shows how therays from an object are reflected by a convex mirror to form animage The reflected rays diverge and never meet so a convexmirror forms only a virtual image The image also is upright andsmaller than the actual object is

Describe the image formed by a convex mirror

LensesWhat do your eyes have in common with cameras eyeglasses

and microscopes Each of these contains at least one lens A lens is atransparent object with at least one curved surface that causes lightrays to refract The image that a lens forms depends on the shape ofthe lens Like curved mirrors lenses can be convex or concave

Convex Lenses A convex lens is thicker in the middle than atthe edges Its optical axis is an imaginary straight line that is per-pendicular to the surface of the lens at its thickest point When lightrays approach a convex lens traveling parallel to its opticalaxis the rays are refracted toward the center of the lens asin Figure 18 Light rays traveling along the optical axis arenot bent at all All light rays traveling parallel to the opti-cal axis are refracted so they pass through a single pointwhich is the focal point of the lens The less curved thesides of the lens the less light rays are bent As a resultlenses with flatter sides have longer focal lengths Figure 19

on the next page shows that convex lenses can form eitherreal or virtual images

Figure 18 Convex lenses are

thicker in the middle than at the

edges Light rays that are parallel

to the optical axis are refracted so

that they pass through the focal

point A light ray that passes

through the center of the lens is

not refracted

Figure 17 A convex mirror

forms a reduced upright virtual

image

Optical axis

Ray A

Ray B

Focallength

Focalpoint

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Figure 19

VISUALIZING IMAGES FORMED BY A CONVEX LENS

334 CHAPTER 11 Sound and Light

Aconvex lens can form images that are real or virtual enlarged or reduced and upright orinverted Just as for a concave mirror the type of image formed by a convex lens depends on thelocation of the object relative to the focal point of the lens

Optical axis

One

focal

length

Two

focal

lengthsRay B

Image

Ray A

Object

Focal

point

Optical axis

One

focal

length

Two

focal

lengths

Ray B

Ray AObject

Image

Focal

point

Optical axis

Ray B

ObjectRay A

One

focal

length

Focal

pointImage

If the object is more than two focal lengths from the lens the image formed is real inverted andsmaller than the object As the object moves farther from the lens the image becomes smaller

If the object is between one and two focal lengths from the lens the image formed is real invertedand larger than the object As the object moves closer to the focal point the image becomes larger

If the object is less than one focal length from the lens the image is virtual upright and larger thanthe object The image is virtual because the light rays from the object diverge after they pass throughthe lens The image becomes smaller as the object moves closer to the lens

SECTION 3 Mirrors Lenses and the Eye 335

Concave Lenses A concave lens is thinnerin the middle and thicker at the edges Asshown in Figure 20 light rays that passthrough a concave lens bend away from theoptical axis The rays spread out and nevermeet so a real image is never formed Theimage is always virtual upright and smallerthan the object is Concave lenses are used insome types of eyeglasses and some telescopesConcave lenses usually are used in combinationwith other lenses

What type of image is formed by a concave lens

The Human EyeWhat determines how well you can see the words on this

page If you donrsquot need eyeglasses the structure of your eye givesyou the ability to focus on these words and other objects aroundyou Look at Figure 21 Light enters your eye through a trans-parent covering on your eyeball called the cornea The corneacauses light rays to bend so that they converge The light thenpasses through an opening called the pupil Behind the pupil isa flexible convex lens Muscles attached to the lens change itsshape to help focus light forming a sharp image on your retina

The retina is the inner lining of your eye The retina con-tains light-sensitive cells that convert an image into electricalsignals These signals then are carried along the optic nerve toyour brain to be interpreted With this complex structurethe human eye is capable of seeing clearly in bright and dimconditions focusing on both near and far objects and alsodetecting colors

Figure 20 A concave lens

refracts light rays so they spread

out away from the optical axis

Classify Is a concave lens mostlike a concave mirror or a convexmirror

Optical axis

Retina

Focalpoint

Pupil

Cornea

Lens

Optic nerve

Figure 21 The cornea and lens in your eye

bend light rays so that a sharp image is

formed on the retina

Eye Doctors Optometristsand ophthalmologists treatmany different eye prob-lems They often useadvanced technology todiagnose and correct mal-functioning parts of theeye Research an eye prob-lem and how it is treatedWrite a paragraph describ-ing what parts of the eyeare affected by the problemand how doctors correct it

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336 CHAPTER 11 Sound and Light

Brightness and Intensity The human eye can adjust to thebrightness of the light that strikes it If you step outside on asunny day you may have to shade your eyes against the intensityof the sunlight Light intensity is the amount of light energy thatstrikes a certain area each second Brightness is the human per-ception of light intensity Sunlight seems bright because a largeamount of light energy strikes your retina each second Youreyes respond to bright light by decreasing the size of your pupilThis reduces the amount of light that enters your eye and strikesthe retina

Intensity depends on your distance from a light source Ifyou move away from a bare lightbulb you can see how theintensity of the light rapidly decreases Because light rays spreadout from the source less light energy strikes your retina thefarther away you are from the bulb

Correcting Vision ProblemsIf you have good vision you should be able to see objects

clearly when they are 25 cm or farther away from your eyes Asharp image of an object should be formed on your retinaHowever for many people the image is blurry or formed in thewrong place causing vision problems

Farsightedness If you can see distant objects clearly butcanrsquot bring nearby objects into focus then you are farsighted Inthis case the eyeball might be too short or the lens isnrsquot curvedenough to form a sharp image of nearby objects on the retinaas shown in Figure 22 To correct the problem convex lensescan be used to bend incoming light rays so they converge beforethey enter the eye

Experimenting withFocal LengthsProcedure1 Complete the safety form

2 Fill a glass test tube with

water and seal it with a

lid or stopper3 Type or print SULFUR

DIOXIDE in capital letters

on a piece of paper4 Set the test tube horizon-

tally over the words

Record your observations

5 Hold the tube at several

heights above the words

Record your observations

Analysis1 Describe how the words

changed as the height of

the test tube increased

2 Classify the image at each

height as real or virtual

Focal

point

Correctedfarsighted eye

Light fromnearby object

Focalpoint

Light fromnearby object

Farsighted eye

The focal length of a farsighted eye is too long to form

a sharp image of nearby objects on the retina

A convex lens in front of a farsighted eye enables a sharp

image of nearby objects to be formed on the retina

Figure 22 Farsightedness can

be corrected by convex lenses

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SECTION 3 Mirrors Lenses and the Eye 337

Self Check

1 Diagram how light rays from an object are reflected by

a convex mirror to form an image

2 Infer how the size of the image changes if an object

that is less than one focal length from a concave mirror

moves closer to the mirror

3 Explain how the focal length of a convex lens changes

as the sides of the lens become less curved

4 Compare the image of an object less than one focal

length from a convex lens with the image of an object

more than two focal lengths from the lens

5 Think Critically Describe the image formed by a light

source placed at the focal point of a convex lens

Summary

Mirrors

bull A plane mirror forms upright virtual images

bull The image formed by a concave mirror

depends on the location of the object relative

to the focal point

bull Convex mirrors always produce virtual upright

images that are smaller than the object

Lenses

bull The image formed by a convex lens depends

on the distance of the object from the lens

bull Concave lenses always form virtual upright

images that are smaller than the object

The Eye and Vision

bull The eye contains a lens that changes shape to

produce sharp images on the retina

bull Farsightedness occurs when the eye cannot

form a sharp image of nearby objects

Nearsightedness occurs when the eye cannot

form sharp images of distant objects

6 Calculate Object Distance If you looked through a

convex lens with a focal length of 15 cm and saw a

real inverted enlarged image what is the maximum

distance between the lens and the object

Nearsightedness If you have nearsighted friends you knowthat they can see only nearby objects clearly Their eyes cannotform a sharp image on the retina of an object that is far awayInstead the image is formed in front of the retina as shown inFigure 23 To correct this problem a nearsighted person canwear concave lenses Figure 23 shows how a concave lens causesincoming light rays from distant objects to diverge before theyreach the eye Then the rays can be focused by the eye to form asharp image on the retina

Figure 23 Nearsightedness can

be corrected with concave lenses

Focalpoint

Light fromdistant object

Nearsighted eye

Focalpoint

Light fromdistant object

Correctednearsighted eye

When a nearsighted person looks at distant objects a

sharp image is formed in front of the retina

A concave lens in front of a nearsighted eye makes light

rays diverge so a sharp image is formed on the retina

More Section Review gpesciencecom

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How can you see the back of your head You

can use two mirrors to view a reflection of a

reflection of the back of your head

Real-World ProblemHow many images are seen in two mirrors

Goal Infer how the number of images depends

on the angle between two mirrors

Materialsplane mirrors (2) protractor

masking tape paper clip

Safety Precautions

Handle glass mirrors and paper clips carefully

Procedure1 Complete the safety form

2 Lay one mirror on top of the other with the

mirror surfaces together Tape together one

side so they can open and close Use tape to

label them L and R for left and right

3 Open the mirrors and stand them on a sheet

of paper at an angle of 72deg

4 Bend one leg of a paper clip up 90deg and

place it close to the front of the R mirror

5 Count the number of images of the paper

clip you see in the R and L mirrors Record

these numbers in your data table

6 The mirrors create an image of a circle

divided into wedges Record the number

of wedges

7 Hold the R mirror still and slowly move the Lmirror to 90deg Record the numbers of images

of the clip and wedges in the circle Repeat

this time opening the mirrors to 120deg

Conclude and Apply1 Infer the relationship between the number

of wedges and paper clip images

2 Determine the angle that would divide a

circle into six wedges Hypothesize how

many images would be produced Test your

hypothesis

Reflections of Reflections

Demonstrate for younger students the

relationship between the angle of the

mirrors and the number of reflections

338 CHAPTER 11 Sound and Light

Angle

Number of Number

of Mirrors Paper Clip Images

of Wedges R L

72ordm

90ordm

120ordm

Images and Wedges Seen in the Mirrors

Do not write in this book

SECTION 4 Light and Color 339

Why Objects Have ColorWhy do some apples appear red while others look green or

yellow An objectrsquos color depends on the wavelengths of light itreflects Recall that white light is a blend of all colors of visiblelight When a red apple is struck by white light it reflects redlight back to your eyes and absorbs all of the other colorsFigure 24 shows white light striking a green leaf Only the wave-lengths corresponding to green light are reflected to your eyes

Although some objects appear to be black black isnrsquot acolor Black is the absence of visible light Objects that appearblack absorb all colors of light and reflect little or no light backto your eyes White objects appear to be white because theyreflect all colors of visible light

Why does a white object appear white

Colored Filters Wearing tinted glasses changesthe color of almost everything you see If the lensesare yellow the world takes on a golden glow If theyare rose colored everything looks rosy Somethingsimilar would occur if you placed a colored clearplastic sheet over this white page The paper wouldappear to be the same color as the plastic The plasticsheet and the tinted lenses are filters A filter is atransparent material that transmits one or more col-ors of light but absorbs all others The color of a fil-ter is the color of the light that it transmits

Light and Color

Reading Guide

Explain how you see color Describe the difference between

light color and pigment color Predict what happens when dif-

ferent colors are mixed

From traffic lights to great works of

art color is an important part of your

world

Review Vocabulary

retina inner layer of the eye con-

taining cells that convert light

images into electrical signals

New Vocabulary

bull pigment

Figure 24 This leaf absorbs all

wavelengths of visible light except

the wavelengths you see as green

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340 CHAPTER 11 Sound and Light

Looking Through Colored Filters Figure 25 shows howthe color of an object can change when you look at it throughvarious colored filters The cooler looks blue under white lightbecause it reflects only the wavelengths of blue light that strikeit If you look at the cooler through a blue filter the cooler stilllooks blue because the blue filter transmits the reflected bluelight However if you look at the cooler through a red filter thecooler seems black because the red filter blocks the blue lightreflected by the cooler

Why does a blue object appear black whenviewed through a red filter

Seeing ColorAs you approach a busy intersection the color of the traffic

light changes from green to yellow to red On the cross street thecolor changes from red to green At a busy intersection trafficsafety depends on your ability to detect color changes rapidlyHow do you see colors

Light and the Eye In a healthy eye light enters the eyethrough the cornea is focused by the lens and finally forms animage on the retina The retina is made up of two types of cellsthat absorb light as shown in Figure 26 When these cellsabsorb light energy chemical reactions convert light energy intonerve impulses that are transmitted to the brain One type ofcell in the retina called a cone enables you to distinguish colorsand detailed shapes of objects Cones need bright light to gener-ate nerve impulses so they do not operate in dim light As aresult even brightly colored objects might look gray or black indim light

Figure 25 The color of this

cooler changes when viewed

through different color filters

Topic Color BlindnessVisit for Web

links to information about the

causes of color blindness

Activity Research the causes

and types of color blindness Find

out how cones are related to the

ability to distinguish colors

gpesciencecom

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SECTION 4 Light and Color 341

Cones and Rods Your eyes have three types of cones each ofwhich responds to a different range of wavelengths Red conesrespond to mostly red and yellow light Green cones respond tomostly yellow and green light Blue cones respond to mostlyblue and violet light The second type of cell in the retina calleda rod is sensitive to dim light and enables you to see at nightHowever rod cells do not enable you to see colors

Interpreting Color Why does a bananalook yellow The light reflected by the

banana causes the cone cells that are sensitive to red and greenlight to send signals to your brain Your brain could get the samesignal if a mixture of red light and green light reached your eyesThis mixture also would cause your red and green cones torespond and you would see the color yellow As a result lightwith wavelengths corresponding to yellow light and light that isa mixture of red and green light both cause the color yellow tobe seen What happens when you look at a white shirt You seewhite when all wavelengths of visible light enters your eyes Thenall three sets of cones cells send signals to the brain The com-bination of these signals cause you to see the shirt as white

Color Blindness If one or more of your sets of cone cellsdo not function properly you might not be able to distinguishcertain colors This condition is called color blindness orcolor deficiency About eight percent of men and one-halfpercent of women have some form of color blindness Themost common form of color blindness makes it difficult todistinguish between red and green Figure 27 shows an imagethat is used in a test for redndashgreen color blindness Becausered and green are used in traffic signals drivers and pedestri-ans must be able to identify them

Retina

Rod

Cone

Lens

Figure 27 Color blindness is an

inherited sex-linked condition in

which certain sets of cones in the

retina do not function properly

Identify the number that you seein the dots

Figure 26 Light enters the eye

and focuses on the retina The two

types of light-detecting cells

that make up the retina

are called rods and cones

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342 CHAPTER 11 Sound and Light

Mixing ColorsIf you have ever browsed through a paint store you have

probably seen displays where customers can select paint samplesof almost every imaginable color The colors are a result of mix-tures of pigments For example you might have mixed blue andyellow paint to produce green paint A pigment is a coloredmaterial that is used to change the color of other substancesThe color of a pigment results from the different wavelengths oflight that the pigment reflects

Mixing Colored Lights From the glowing orange of a sun-set to the deep blue of a mountain lake all the colors you see canbe made by mixing three colors of light These three colorsmdashred green and bluemdashare the primary colors of light They cor-respond to the three different types of cones in the retina ofyour eye When mixed together in equal amounts they producewhite light as Figure 28 shows Mixing the primary colors indifferent proportions can produce the colors you see

What are the primary colors of light

Paint Pigments If you were to mix equal amounts of redgreen and blue paint would you get white paint If mixing col-ors of paint were like mixing colors of light you would but mix-ing paint is different Paints are made with pigments Pigmentsproduce color as a result of the wavelengths of light they reflectPaint pigments usually are made of chemical compounds suchas titanium oxide a bright white pigment and lead chromatewhich is used for painting yellow lines on highways

Figure 28 White light is pro-

duced when the three primary col-

ors of light are mixed in equal

amounts

Color for PhotosynthesisPlant pigments determinethe wavelengths oflight for photosynthesisLeaves usually look greenbecause of the pigmentchlorophyll Chlorophyllabsorbs most wave-lengths of visible lightexcept green which itreflects However not allplants are green Researchdifferent plant pigmentsto find out how they allowplant species to survive indiverse habitats

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SECTION 4 Light and Color 343

Self Check

1 Identity what colors are reflected and what colors are

absorbed if a white light shines on a red shirt

2 Discuss how the primary colors of light differ from the

primary pigment colors

3 Explain why a red apple would appear black if you

looked at it through a blue filter

4 Determine why a white fence appears to be white instead

of multicolored if all colors are present in white light

5 Think Critically Light reflected from an object passes

through a green filter then a red filter and finally a

blue filter What color will the object seem to be

Summary

Why Objects Have Color

bull The color of an object is determined by the

wavelengths of light it reflects

bull The color of a filter is the color of the light the

filter transmits

Seeing Color

bull Rod and cone cells are light-sensitive cells

found in the retina of the human eye

bull Rod cells are sensitive to dim light Cone cells

enable colors to be seen

bull There are three types of cone cells One type

responds to red light another to green light

and another to blue light

Mixing Colors

bull Red green and blue are the primary light

colors Any color of light can be created by

mixing these primary light colors

bull Any pigment color can be formed by mixing

the primary pigment colorsmdashmagenta cyan

and yellow

6 Use Percentages In the human eye there are about

120000000 rods If 90000000 rods trigger at once

what percentage of the total number of rods triggered

7 Convert Units The wavelengths of light are measured

in nanometers (nm) which equals 0000001 mm

Find the wavelength in mm of a light wave that has a

wavelength of 690 nm

Mixing Pigments You can make any pigment color by mixingdifferent amounts of the three primary pigmentsmdashmagenta(bluish red) cyan (greenish blue) and yellow In fact color print-ers use these pigments as well as black ink to make full-colorprints like the pages in this book A primary pigmentrsquos colordepends on the wavelengths of the light that it reflects Actuallypigments both absorb and reflect a range of colors in sending asingle color message to your eye For example in white lightyellow pigment appears yellow because it reflects red and greenlight but absorbs the other wavelengths of visible light The colorof a mixture of two primary pigments is determined by theprimary colors of light that both pigments reflect

Look at Figure 29 The area in the center where the colors alloverlap appears to be black because the three blended primarypigments absorb all the primary colors of light Recall that theprimary colors of light combine to produce white light They arecalled additive colors However when the primary pigment col-ors are combined they absorb all wavelengths of visible light andproduce black Because black results from the absence ofreflected light the primary pigments are called subtractive colors

Figure 29 The three primary

pigment colors appear to be black

when they are mixed

Describe how the primary pigmentcolors are similar to the primary col-ors of light

More Section Review gpesciencecom

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Design Your OwnDesign Your Own

344

Real-World ProblemWhat loud noises do you enjoy and which ones do you find annoying

Most people enjoy a music concert performed by their favorite artist or

the booming displays of fireworks on the Fourth of July Most people

enjoy these loud sounds for short periods of time However certain

other loud noises such as traffic sirens and loud talking can be

annoying Constant annoying noises are called noise pollution What

can be done to reduce noise pollution What types of barriers will best

block out noise pollution

Form a HypothesisBased on your experiences with loud noises form a hypothesis that

predicts the effectiveness of different types of barriers at blocking out

noise pollution

Test Your HypothesisMake a Plan

1 Complete the safety form

2 Decide what type of barriers or materials you will test

3 Describe exactly how you will use these materials

Goals Design an experiment

that tests the effective-

ness of various types of

barriers and materials

for blocking out noise

pollution

Test different types of

materials and barriers

to determine the best

noise blocks

Possible Materialsradio CD player horn

drum or other loud

noise source

shrubs trees concrete

walls brick walls stone

walls wooden fences

parked cars or hanging

laundry

sound meter

meterstick or metric tape

measure

Blocking NfisePollution

4 Identify the controls and variables you will use in your

experiment

5 List the steps you will use and describe each step precisely

6 Prepare a data table in your Science Journal to record your

measurements

7 Organize the steps of your experiment in logical order

Follow Your Plan

1 Ask your teacher to approve your plan and data table before

you start

2 Conduct your experiment as planned

3 Test each barrier two or three times

4 Record the results from each test in your data table in your Science Journal

Analyze Your Data1 Identify the barriers that most effectively reduced noise pollution

2 Identify the barriers that least effectively reduced noise pollution

3 Compare the effective barriers and identify common characteristics that might

explain why they reduced noise pollution

4 Compare the natural barriers you tested with the artificial barriers Which type

of barrier best reduced noise pollution

5 Compare the different types of materials the barriers were made of Which

type of material best reduced noise pollution

Conclude and Apply1 Evaluate whether your results support your hypothesis

2 Predict how your results would differ if you used a louder source of noise such

as a siren

3 Infer from your results how people living near a

busy street could reduce noise pollution

4 Identify major sources of noise pollution in or

near your home How could they be reduced

5 Research how noise pollution can be

unhealthy

LAB 345

Draw a poster illustrating how builders and

landscapers could use certain materials to

better insulate a home or office from excess

noise pollution

346 CHAPTER 11 Sound and Light

A Haiku GardenThe Four Seasons in Poems and Prints

by Stephen Addiss with Fumiko and Akira Yamamoto

Respond to the Reading1 How do the illustrations help the reader

better understand the poems2 What do you think is meant by the

word lingering in the Haiku about springsunlight

3 Linking Science and Writing Writeone haiku about summer and anotherabout fall In one poem use color tohelp you describe the season In theother use light or some property oflight to help describe the season

Research has deter-mined that there is a

connection between color and mood Warmcolors have longer wavelengths and can bemore stimulating Cool colors which haveshorter wavelengths tend to have a calmingor soothing effect on people Light and colorhave long been used as literary symbols Doesthe use of color change what you imaginewhen you read the haiku

UnderstandingLiteratureJapanese Haiku A haiku is a verse thatconsists of three lines and 17 syllables inthe Japanese language The first and thirdlines have five syllables each and themiddle line has seven syllables Why isimagination important in reading haiku

Lingering

in every pool of watermdash

spring sunlightIssa

Withered by winter

the sound of the windmdash

one-color worldBasho

Sound

1 Sound waves are compressional waves thattravel only in matter

2 The speed of sound in a material dependson the type of material as well as itstemperature

3 Loudness depends on a sound waversquos inten-sity Pitch depends on a sound waversquosfrequency

4 Sound waves are used in echolocationsonar and medical imaging

Reflection and Refractionof Light

1 Light can be absorbed reflected or trans-mitted by a material

2 When light waves are reflected theyobey the law of reflectionmdashthe angle ofincidence equals the angle of reflection

3 A light wave is refracted or bent whenit changes speed as it travels at an anglefrom one material to another

Mirrors Lenses andthe Eye

1 Plane mirrors form upright virtual images

2 Images formed by concave mirrors andconvex lenses depend on the location ofthe object relative to the focal point

3 Convex mirrors and concave lenses formvirtual upright images that are smallerthan the object

4 The lens in the human eye changes shape toproduce a sharp image on the retina

Light and Color

1 You see color when light is reflected offobjects and into your eyes

2 Cone cells in the retina are light-sensitivecells that enable you to distinguish colors

3 Red blue and green are the three primarycolors of light and can be mixed to form allother colors

4 The primary pigment colors are magentacyan and yellow

CHAPTER STUDY GUIDE 347

Use the Foldable you made at the beginningof the chapter to help you review sound and light

Interactive Tutor gpesciencecom

Complete each statement with the correctvocabulary word or phrase

1 A change in frequency due to a movingsound source is due to the

2 A flat smooth surface that reflects light andforms an image is a(n)

3 An object is if you can seethrough it clearly

4 The of a material indicates howmuch the speed of light in the materialchanges as light passes through

5 You can change the color of white paint byadding a(n) to it

6 A(n) is a reflecting surface thatcurves outward like the back of a spoon

7 The human perception of the intensity of asound wave is

Choose the word or phrase that best answerseach question

8 Which of the following best describes imageformation by a plane mirrorA) A real image is formed in front of the mirrorB) A real image is formed behind the mirrorC) A virtual image is formed in front of the

mirrorD) A virtual image is formed behind the mirror

9 For a sound with low pitch what else isalso always lowA) amplitude C) wavelengthB) frequency D) wave velocity

10 Which of the following occurs when asound source moves away from youA) The soundrsquos velocity decreasesB) The soundrsquos loudness increasesC) The soundrsquos frequency decreasesD) The soundrsquos frequency increases

Use the table below to answer question 11

11 Based on the data in the table abovewhich of the following would be the speedof sound in air at 30degCA) 3404 ms C) 3494 msB) 3464 ms D) 3534 ms

12 What happens to a light ray travelingparallel to the optical axis of a convexlens that passes through the lensA) It travels parallel to the optical axisB) It passes through the focal pointC) It is bent away from the optical axisD) It forms a virtual image

13 Light waves of which color are bent mostwhen passing through a prismA) blue C) violetB) red D) yellow

14 Which way does a concave lens bend lightA) toward its optical axisB) toward its centerC) toward its edgesD) toward its focal point

Speed of Sound in Air

Temp peed( s)

4

4

4

348 CHAPTER REVIEW

concave lens p 335concave mirror p 332convex lens p 333convex mirror p 333decibel p 322Doppler effect p 323index of refraction p 329intensity p 322

loudness p 322opaque p 327pigment p 342pitch p 323plane mirror p 331translucent p 327transparent p 327

Vocabulary PuzzleMaker gpesciencecom

Use the illustration below to answer question 15

15 Describe how the position of the candlechanged if the image of the candle movedaway from the focal point

16 Apply Acoustic scientists sometimes doresearch in rooms that absorb all soundwaves How could such a room be used tostudy how bats find their food

17 Compare White light passes through atranslucent pane of glass and shines on ashirt Both the translucent glass and theshirt appear green Compare the colors oflight that are absorbed and transmitted bythe glass and the shirt

18 Infer Most mammals including dogs andcats canrsquot see colors Infer how the retinaof a catrsquos eye might be different from theretina of a human eye

19 Determine whether a convex lens could forman image that is enlarged real and upright

20 Infer A car comes to a railroad crossingThe driver hears a trainrsquos whistle and itspitch becomes lower What can beassumed about how the train is moving

21 Compare and contrast the reflection of lightfrom a white wall with a rough surfacewith the reflection of light from a mirror

Optical axis

One

focal

length

Two

focal

lengths

Image

Ray A

Object

Focal

point

Interpreting Graphics 22 Infer why a convex mirror and a concavelens can never produce a real image

23 Predict what color a white shirt wouldappear to be if the light reflected from theshirt passed through a red filter and thenthrough a green filter

24 Explain why windows might begin to rattlewhen an airplane flies overhead

25 Communicate Some people enjoy usingsnowmobiles Others object to the noisethat they make Write a proposal for a pol-icy that seems fair to both groups for theuse of snowmobiles in a state park

CHAPTER REVIEW 349

Use the wave speed equation ν ƒλ to answer

questions 26 and 27

26 Calculate Frequency A sonar pulse has awavelength of 30 cm and a speed inwater of 1500 ms Find its frequency

27 Calculate Wavelength What is the wave-length of a sound wave with a fre-quency of 440 Hz if the speed of soundin air is 340 ms

28 Calculate Angle of Incidence A light ray isreflected from a mirror If the anglebetween the incident ray and thereflected ray is 136deg what is the angleof incidence

29 Determine Object Distance You hold anobject in front of a concave mirror witha focal length of 30 cm If you do notsee a reflected image how far from themirror is the object

30 Calculate Speed The speed of light in avacuum is 300000 kms If the index ofrefraction of water is 133 what is thespeed of light in water

More Chapter Review gpesciencecom

1 Which of the following describes the imageformed by a convex mirror

A enlarged

B inverted

C real

D virtual

Use the figure below to answer question 2

2 Which of the following describes a light raythat passes through the focal point andthen is reflected by the mirror

A It travels parallel to the optical axis

B It forms a real image

C It is reflected back through the focal point

D It forms a virtual image

3 Why does an apple look red

A It reflects red light

B It absorbs red light

C It reflects green and blue light

D It reflects all colors of light except red

Use the figure below to answer questions 4 and 5

4 When the primary colors of light are addedtogether what color appears in area H

A cyan

B magenta

C white

D yellow

5 When the primary colors of light are addedtogether what color appears in area G

A cyan

B magenta

C white

D yellow

6 Which of the following increases as the fre-quency of a sound increases

A amplitude

B intensity

C loudness

D pitch

Red Blue

Green

F

H

G K

Focal pointOptical axis

350 STANDARDIZED TEST PRACTICE

Record your answers on the answer sheet provided by your teacher or on a sheet of paper

STANDARDIZED TEST PRACTICE 351

7 Which of the following parts of the eyeenable you to see colors in bright light

A cone cells

B cornea

C lens

D rod cells

Use the graph below to answer questions 8 and 9

8 Determine how far in centimeters theimage is from the lens when the object is15 centimeters from the lens

9 How far in centimeters is the object fromthe lens when the image distance andobject distance are equal

10 A shirt has stripes that are black and whitein white light If green light shines on thisshirt what colors will the black and whitestripes be

11 If you are on a moving train what hap-pens to the pitch of a crossing bell as youapproach the crossing and then moveaway from the crossing

Use the figure below to answer question 12

12 Describe the vision problem show by thefigure and explain how this vision prob-lem can be corrected

13 Explain why the human eye can see colorsbetter in bright light than in dim light

Image Distance fora Convex Lens

Ima

ge

dis

tan

ce (

cm)

30

25

20

15

10

5 10 15 20 25 30

Object distance (cm)

Standardized Test Practice gpesciencecom

Note Units Read carefully and make note of the units used in

any measurement

  • Glencoe Physical Science with Earth Science
    • Student Edition Table of Contents
      • Unit 1 Science and Technology
        • Chapter 1 The Nature of Science
          • Launch Lab Understanding Measurements
          • Foldables
          • Section 1 The Methods of Science
            • Science Online
            • Integrate History
            • Integrate Earth Science
            • Science Online
              • Section 2 Standards of Measurement
                • Applying Math Centimeters
                • Integrate Earth Science
                • Science Online
                • MiniLAB Determining the Density of a Pencil
                • Visualizing SI Dimensions
                  • Section 3 Communicating with Graphs
                    • Applying Math Temperature
                    • MiniLAB Graphing Temperature Change
                    • Lab Whats my graph
                    • Lab Design Your Own - Developing a Measurement System
                    • Science and Language Arts Thinking in Pictures and Other Reports from My Life with Autism
                      • Chapter 1 Study Guide
                      • Chapter 1 Review
                      • Chapter 1 Standardized Test Practice
                        • Chapter 2 Science Technology and Society
                          • Lab Technology in Your Life
                          • Foldables
                          • Section 1 Science and Technology
                            • MiniLAB Researching the Past
                            • Visualizing Technology Supplying Basic Needs
                            • Science Online
                              • Section 2 Forces that Shape Technology
                                • MiniLAB Evaluating the Benefits and Consequences of Technology
                                • Integrate Environment
                                • Integrate History
                                • Applying Science What impact does the accident at Chernobyl have on the future of nuclear power
                                • Science Online
                                • Lab Who contributes CO2
                                  • Section 3 Developing Technology
                                    • Integrate Life Science
                                    • Integrate Career
                                    • Lab Model and Invent - Care Package
                                    • Oops Accidents in Science A Slippery Situation
                                      • Chapter 2 Study Guide
                                      • Chapter 2 Review
                                      • Chapter 2 Standardized Test Practice
                                          • Unit 2 Motion Forces and Energy
                                            • Chapter 3 Motion Acceleration and Forces
                                              • Launch Lab Compare Speeds
                                              • Foldables
                                              • Section 1 Describing Motion
                                                • MiniLAB Measuring Average Speed
                                                • Science Online
                                                • Applying Math Average Speed
                                                • Integrate Astronomy
                                                • Science Online
                                                  • Section 2 Acceleration
                                                    • Integrate History
                                                    • Visualizing Acceleration
                                                      • Section 3 Motion and Forces
                                                        • Science Online
                                                        • MiniLAB Comparing Friction
                                                        • Lab Force and Acceleration
                                                        • Lab Design Your Own - Comparing Motion from Different Forces
                                                        • Science and Language Arts A Brave and Startling Truth
                                                          • Chapter 3 Study Guide
                                                          • Chapter 3 Review
                                                          • Chapter 3 Standardized Test Practice
                                                            • Chapter 4 The Laws of Motion
                                                              • Launch Lab The Force of Gravity
                                                              • Foldables
                                                              • Section 1 The First Two Laws of Motion
                                                                • MiniLAB Observing Inertia
                                                                • Science Online
                                                                • Applying Math The Acceleration of a Sled Solve a Simple Equation
                                                                  • Section 2 Gravity
                                                                    • Science Online
                                                                    • Integrate Earth Science
                                                                    • MiniLAB Observing Centripetal Force
                                                                    • Lab Gravity and Air Resistance
                                                                      • Section 3 The Third Law of Motion
                                                                        • Integrate Career
                                                                        • Visualizing Rocket Motion
                                                                        • Applying Math The Momentum of a Sprinter
                                                                        • Lab The Momentum of Colliding Objects
                                                                        • Science and History Newton and the Plague
                                                                          • Chapter 4 Study Guide
                                                                          • Chapter 4 Review
                                                                          • Chapter 4 Standardized Test Practice
                                                                            • Chapter 5 Energy
                                                                              • Launch Lab Energy Conversions
                                                                              • Foldables
                                                                              • Section 1 The Nature of Energy
                                                                                • Science Online
                                                                                • Applying Math Kinetic Energy
                                                                                • MiniLAB Interpreting Data from a Slingshot
                                                                                • Integrate Language Arts
                                                                                • Applying Math Gravitational Potential Energy
                                                                                • Lab Bouncing Balls
                                                                                  • Section 2 Conservation of Energy
                                                                                    • Visualizing Energy Transformations
                                                                                    • Integrate Environment
                                                                                    • MiniLAB Transforming Energy in a Paper Clip
                                                                                    • Science Online
                                                                                    • Integrate Health
                                                                                    • Lab Design Your Own - Swinging Energy
                                                                                    • Science and History The Impossible Dream
                                                                                      • Chapter 5 Study Guide
                                                                                      • Chapter 5 Review
                                                                                      • Chapter 5 Standardized Test Practice
                                                                                        • Chapter 6 Work and Machines
                                                                                          • Launch Lab Doing Work with a Simple Machine
                                                                                          • Foldables
                                                                                          • Section 1 Work
                                                                                            • Integrate Language Arts
                                                                                            • Applying Math Work
                                                                                            • MiniLAB Calculating Your Work and Power
                                                                                            • Applying Math Power
                                                                                              • Section 2 Using Machines
                                                                                                • MiniLAB Machines Multiplying Force
                                                                                                • Science Online
                                                                                                • Integrate Chemistry
                                                                                                  • Section 3 Simple Machines
                                                                                                    • Integrate History
                                                                                                    • Visualizing Levers in the Human Body
                                                                                                    • Science Online
                                                                                                    • Lab Levers
                                                                                                    • Lab Model and Invent - Using Simple Machines
                                                                                                    • Science and Society The Science of Very Very Small
                                                                                                      • Chapter 6 Study Guide
                                                                                                      • Chapter 6 Review
                                                                                                      • Chapter 6 Standardized Test Practice
                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                          • Launch Lab Relative Sizes of Earth the Moon and the Sun
                                                                                                          • Foldables
                                                                                                          • Section 1 Earth in Space
                                                                                                            • Science Online
                                                                                                            • Integrate Physics
                                                                                                              • Section 2 Time and Seasons
                                                                                                                • MiniLAB Modeling the Suns Rays at Solstice
                                                                                                                • Lab Comparing the Angle of Sunlight to Intensity
                                                                                                                  • Section 3 Earths Moon
                                                                                                                    • Applying Math Tides
                                                                                                                    • MiniLAB Modeling Phases and Eclipses
                                                                                                                    • Integrate History
                                                                                                                    • Integrate History
                                                                                                                    • Science Online
                                                                                                                    • Visualizing Water on the Moon
                                                                                                                    • Lab Identifying the Moons Surface Features and Apollo Landing Sites
                                                                                                                    • Oops Accidents in Science Even Great Scientists Make Mistakes
                                                                                                                      • Chapter 7 Study Guide
                                                                                                                      • Chapter 7 Review
                                                                                                                      • Chapter 7 Standardized Test Practice
                                                                                                                        • Chapter 8 The Solar System
                                                                                                                          • Launch Lab The Size of the Solar System
                                                                                                                          • Foldables
                                                                                                                          • Section 1 Planet Motion
                                                                                                                            • Integrate History
                                                                                                                            • MiniLAB Plotting Retrograde Motion
                                                                                                                            • Integrate Physics
                                                                                                                            • Applying Math Heliocentric Longitude (HL)
                                                                                                                              • Section 2 The Inner Planets
                                                                                                                                • Science Online
                                                                                                                                • Integrate Chemistry
                                                                                                                                • Lab Interpreting Features of Marss Surface
                                                                                                                                  • Section 3 The Outer Planets
                                                                                                                                    • Integrate Language Arts
                                                                                                                                    • Visualizing What Galileo Saw
                                                                                                                                    • Science Online
                                                                                                                                    • MiniLAB Comparing Sizes of Outer and Inner Planets
                                                                                                                                      • Section 4 Life in the Solar System
                                                                                                                                        • Lab Design Your Own - Testing Unknown Soil Samples for Life
                                                                                                                                        • Science Stats Night Sky Wonders
                                                                                                                                          • Chapter 8 Study Guide
                                                                                                                                          • Chapter 8 Review
                                                                                                                                          • Chapter 8 Standardized Test Practice
                                                                                                                                              • Unit 3 Energy in Motion
                                                                                                                                                • Chapter 9 Heat and States of Matter
                                                                                                                                                  • Launch Lab Expansion of a Gas
                                                                                                                                                  • Foldables
                                                                                                                                                  • Section 1 Temperature and Thermal Energy
                                                                                                                                                    • Applying Math Converting to Celsius
                                                                                                                                                    • Science Online
                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                    • Applying Math Change in Thermal Energy
                                                                                                                                                      • Section 2 States of Matter
                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                        • Science Online
                                                                                                                                                        • MiniLAB Comparing States of Water
                                                                                                                                                          • Section 3 Transferring Thermal Energy
                                                                                                                                                            • MiniLAB Comparing Thermal Conductors
                                                                                                                                                            • Visualizing Convection Currents
                                                                                                                                                            • Lab Convection in Gases and Liquids
                                                                                                                                                              • Section 4 Using Thermal Energy
                                                                                                                                                                • Integrate History
                                                                                                                                                                • Science Online
                                                                                                                                                                • Lab Conduction in Gases
                                                                                                                                                                • Science Stats Surprising Thermal Energy
                                                                                                                                                                  • Chapter 9 Study Guide
                                                                                                                                                                  • Chapter 9 Review
                                                                                                                                                                  • Chapter 9 Standardized Test Practice
                                                                                                                                                                    • Chapter 10 Waves
                                                                                                                                                                      • Launch Lab How do waves transfer energy
                                                                                                                                                                      • Foldables
                                                                                                                                                                      • Section 1 The Nature of Waves
                                                                                                                                                                        • Visualizing Formation of Ocean Waves
                                                                                                                                                                        • Science Online
                                                                                                                                                                          • Section 2 Wave Properties
                                                                                                                                                                            • MiniLAB Observing Wavelength
                                                                                                                                                                            • Integrate Social Studies
                                                                                                                                                                            • Applying Math The Speed of Sound
                                                                                                                                                                            • Lab Wave Speed and Tension
                                                                                                                                                                              • Section 3 The Behavior of Waves
                                                                                                                                                                                • Science Online
                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                • MiniLAB Experimenting with Resonance
                                                                                                                                                                                • Lab Measuring Wave Properties
                                                                                                                                                                                • Science and History Making Waves
                                                                                                                                                                                  • Chapter 10 Study Guide
                                                                                                                                                                                  • Chapter 10 Review
                                                                                                                                                                                  • Chapter 10 Standardized Test Practice
                                                                                                                                                                                    • Chapter 11 Sound and Light
                                                                                                                                                                                      • Launch Lab What sound does a ruler make
                                                                                                                                                                                      • Foldables
                                                                                                                                                                                      • Section 1 Sound
                                                                                                                                                                                        • MiniLAB Comparing Intensity
                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                        • Science Online
                                                                                                                                                                                        • Applying Math Using Sonar
                                                                                                                                                                                          • Section 2 Reflection and Refraction of Light
                                                                                                                                                                                          • Section 3 Mirrors Lenses and the Eye
                                                                                                                                                                                            • Visualizing Images Formed by a Convex Lens
                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                            • MiniLAB Experimenting with Focal Lengths
                                                                                                                                                                                            • Lab Reflections of Reflections
                                                                                                                                                                                              • Section 4 Light and Color
                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Lab Design Your Own - Blocking Noise Pollution
                                                                                                                                                                                                • Science and Language Arts A Haiku Garden The Four Seasons in Poems and Print
                                                                                                                                                                                                  • Chapter 11 Study Guide
                                                                                                                                                                                                  • Chapter 11 Review
                                                                                                                                                                                                  • Chapter 11 Standardized Test Practice
                                                                                                                                                                                                    • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                      • Launch Lab Global Jigsaw Puzzle
                                                                                                                                                                                                      • Foldables
                                                                                                                                                                                                      • Section 1 Evolution of Earths Crust
                                                                                                                                                                                                        • Applying Math Spreading Distances
                                                                                                                                                                                                        • Integrate Physics
                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                          • Section 2 Earthquakes
                                                                                                                                                                                                            • MiniLAB Demonstrating Four Types of Stress
                                                                                                                                                                                                            • Visualizing Earthquake-Proof Buildings
                                                                                                                                                                                                              • Section 3 Earths Interior
                                                                                                                                                                                                              • Section 4 Volcanoes
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • MiniLAB Modeling Lava Viscosity
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                • Lab A Case for Pacific Plate Motion
                                                                                                                                                                                                                • Lab Earthquake Earthquake Wheres the earthquake
                                                                                                                                                                                                                • Science and History Volcano Weather
                                                                                                                                                                                                                  • Chapter 12 Study Guide
                                                                                                                                                                                                                  • Chapter 12 Review
                                                                                                                                                                                                                  • Chapter 12 Standardized Test Practice
                                                                                                                                                                                                                      • Unit 4 Forms of Energy
                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                          • Launch Lab Electric Circuits
                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                          • Section 1 Electric Charge
                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                            • Visualizing Lightning
                                                                                                                                                                                                                            • MiniLAB Investigate Charged Objects
                                                                                                                                                                                                                              • Section 2 Electric Current
                                                                                                                                                                                                                                • MiniLAB Investigating Battery Addition
                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                • Lab Identifying Conductors and Insulators
                                                                                                                                                                                                                                  • Section 3 Electrical Energy
                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                    • Applying Math Power Used by a Clothes Dryer
                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                    • Applying Math Electrical Energy Used by a Microwave Oven
                                                                                                                                                                                                                                    • Lab Design Your Own - Comparing Series and Parallel Circuits
                                                                                                                                                                                                                                    • Science and Language Arts Invisible Man
                                                                                                                                                                                                                                      • Chapter 13 Study Guide
                                                                                                                                                                                                                                      • Chapter 13 Review
                                                                                                                                                                                                                                      • Chapter 13 Standardized Test Practice
                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                          • Launch Lab The Strength of Magnets
                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                          • Section 1 Magnetism
                                                                                                                                                                                                                                            • MiniLAB Observing Magnetic Interference
                                                                                                                                                                                                                                            • Integrate Earth Science
                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                            • Applying Science How can magnetic parts of a junk car be salvaged
                                                                                                                                                                                                                                            • MiniLAB Making Your Own Compass
                                                                                                                                                                                                                                              • Section 2 Electricity and Magnetism
                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                  • Section 3 Producing Electric Current
                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                    • Visualizing Motors and Generators
                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                    • Lab Electricity and Magnetism
                                                                                                                                                                                                                                                    • Lab Design Your Own - Controlling Electromagnets
                                                                                                                                                                                                                                                    • Science and History Body Art
                                                                                                                                                                                                                                                      • Chapter 14 Study Guide
                                                                                                                                                                                                                                                      • Chapter 14 Review
                                                                                                                                                                                                                                                      • Chapter 14 Standardized Test Practice
                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                          • Launch Lab Can electromagnetic waves change materials
                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                          • Section 1 What are electromagnetic waves
                                                                                                                                                                                                                                                            • MiniLAB Investigating Electromagnetic Waves
                                                                                                                                                                                                                                                            • Applying Math The Speed of Light in Water
                                                                                                                                                                                                                                                              • Section 2 The Electromagnetic Spectrum
                                                                                                                                                                                                                                                                • MiniLAB Heating with Microwaves
                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                • Lab The Shape of Satellite Dishes
                                                                                                                                                                                                                                                                  • Section 3 Radio Communication
                                                                                                                                                                                                                                                                    • Visualizing Radio Broadcasts
                                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Lab Use the Internet - Radio Frequencies
                                                                                                                                                                                                                                                                    • Science and History Riding a Beam of Light
                                                                                                                                                                                                                                                                      • Chapter 15 Study Guide
                                                                                                                                                                                                                                                                      • Chapter 15 Review
                                                                                                                                                                                                                                                                      • Chapter 15 Standardized Test Practice
                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                          • Launch Lab Heating with Solar Energy
                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                          • Section 1 Fossil Fuels
                                                                                                                                                                                                                                                                            • Visualizing The Formation of Fossil Fuels
                                                                                                                                                                                                                                                                            • MiniLAB Designing an Efficient Water Heater
                                                                                                                                                                                                                                                                              • Section 2 Nuclear Energy
                                                                                                                                                                                                                                                                                • Integrate Earth Science
                                                                                                                                                                                                                                                                                • Integrate Social Science
                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                • Applying Science Can a contaminated radioactive site be reclaimed
                                                                                                                                                                                                                                                                                  • Section 3 Renewable Energy Sources
                                                                                                                                                                                                                                                                                    • MiniLAB Using Solar Power at Home
                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                    • Lab Solar Heating
                                                                                                                                                                                                                                                                                    • Lab Use the Internet How much does energy really cost
                                                                                                                                                                                                                                                                                    • Science and Society Reacting to Nuclear Energy
                                                                                                                                                                                                                                                                                      • Chapter 16 Study Guide
                                                                                                                                                                                                                                                                                      • Chapter 16 Review
                                                                                                                                                                                                                                                                                      • Chapter 16 Standardized Test Practice
                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                          • Lab Atmospheric Pressure
                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                          • Section 1 Earths Atmosphere
                                                                                                                                                                                                                                                                                            • MiniLAB Visualizing Convection
                                                                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                                                                            • Lab Visualizing a Temperature Inversion
                                                                                                                                                                                                                                                                                              • Section 2 Weather
                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Coriolis Effect
                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                  • Section 3 Climate
                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                    • Visualizing Earths Biogeophysical System
                                                                                                                                                                                                                                                                                                      • Section 4 Earths Changing Climates
                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                        • Applying Math Carbon Dioxide (CO2) Concentration
                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Investigating Microclimate
                                                                                                                                                                                                                                                                                                        • Science and Language Arts The Grapes of Wrath
                                                                                                                                                                                                                                                                                                          • Chapter 17 Study Guide
                                                                                                                                                                                                                                                                                                          • Chapter 17 Review
                                                                                                                                                                                                                                                                                                          • Chapter 17 Standardized Test Practice
                                                                                                                                                                                                                                                                                                              • Unit 5 Matter and Earth Materials
                                                                                                                                                                                                                                                                                                                • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                  • Launch Lab Demonstrate the Distillation of Water
                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                  • Section 1 Composition of Matter
                                                                                                                                                                                                                                                                                                                    • Visualizing Elements
                                                                                                                                                                                                                                                                                                                    • MiniLAB Classifying Materials
                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                    • Lab Comparing Pure Substances and Mixtures
                                                                                                                                                                                                                                                                                                                      • Section 2 Properties of Matter
                                                                                                                                                                                                                                                                                                                        • Integrate Environment
                                                                                                                                                                                                                                                                                                                        • MiniLAB Separating Ink
                                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                                        • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                        • Applying Math The Law of Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Measuring the Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Science Stats Intriguing Elements
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Study Guide
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Review
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                            • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                              • Launch Lab Inferring What You Cant Observe
                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                              • Section 1 Structure of the Atom
                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling an Aluminum Atom
                                                                                                                                                                                                                                                                                                                                • Visualizing The Atomic Model
                                                                                                                                                                                                                                                                                                                                  • Section 2 Masses of Atoms
                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                    • Applying Science How can radioactive isotopes help tell time
                                                                                                                                                                                                                                                                                                                                      • Section 3 The Periodic Table
                                                                                                                                                                                                                                                                                                                                        • MiniLAB Organizing a Personal Periodic Table
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Career
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                                                                                                                                                                        • Lab A Periodic Table of Foods
                                                                                                                                                                                                                                                                                                                                        • Lab Use the Internet Whats in a name
                                                                                                                                                                                                                                                                                                                                        • Science and History A Chilling Story
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Study Guide
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Review
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                            • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                              • Launch Lab Earth Materials at Home and School
                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                              • Section 1 Minerals
                                                                                                                                                                                                                                                                                                                                                • MiniLAB Identifying Salts Crystal System
                                                                                                                                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                • Lab Be a Mineral Detective
                                                                                                                                                                                                                                                                                                                                                  • Section 2 Igneous Rocks
                                                                                                                                                                                                                                                                                                                                                    • Applying Math Extrusive Igneous Rock Classification
                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                      • Section 3 Sedimentary Rocks
                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Evaporites
                                                                                                                                                                                                                                                                                                                                                          • Section 4 Metamorphic Rocks and the Rock Cycle
                                                                                                                                                                                                                                                                                                                                                            • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                            • Visualizing Shock Metamorphic Rock
                                                                                                                                                                                                                                                                                                                                                            • Lab Identifying Rocks
                                                                                                                                                                                                                                                                                                                                                            • Science and Society Earth Materials at Work
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Study Guide
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Review
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                  • Launch Lab Have you got the time
                                                                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                                                                  • Section 1 Weathering and Soil
                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing a Disappearing Seasoning
                                                                                                                                                                                                                                                                                                                                                                    • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                    • Lab Graphing Soil Textures
                                                                                                                                                                                                                                                                                                                                                                      • Section 2 Shaping the Landscape
                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Runoff
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                          • Section 3 Groundwater
                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Porosity Volume
                                                                                                                                                                                                                                                                                                                                                                            • Visualizing The Role of Groundwater in Shaping Earths Surface
                                                                                                                                                                                                                                                                                                                                                                            • Integrate Environment
                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                              • Section 4 Geologic Time
                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                                                                                                • Lab Its about time - relative that is
                                                                                                                                                                                                                                                                                                                                                                                • Science and Society Tapping into the Underground
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Review
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                      • Unit 6 Interactions of Matter
                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                          • Lab Chemical Bonds and Mixing
                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Stability in Bonding
                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                            • Lab Atomic Trading Cards
                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Types of Bonds
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Health
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                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Observing a Bond Type
                                                                                                                                                                                                                                                                                                                                                                                                • Visualizing Polar Molecules
                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Writing Formulas and Naming Compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math Determining a Formula
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Science Can you name binary ionic compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Making a Hydrate
                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Model and Invent - Modeling Chemical Bonding
                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Sticky Subject
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Study Guide
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                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab RustingmdashA Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Chemical Changes
                                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Designing a Team Equation
                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Chemical Equations
                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math Barium Sulfate Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Classifying Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 4 Reaction Rates and Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing Chemical Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Creating a Colorful Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab To Glow or Not to Glow
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Investigating Reaction Conditions
                                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Clumsy Move Pays Off
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Study Guide
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                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab Magic Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 How Solutions Form
                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                                                                                                                                                                                                                                                            • Visualizing Metal Alloys
                                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Observing the Effect of Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Solubility and Concentration
                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Acids Bases and Salts
                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing Acid Relief
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Strength of Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Determining Acidity
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Saturated Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and Society Acid Rain
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Study Guide
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                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab The Size of a Nucleus
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Strong Force
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                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Detecting Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math The Age of Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Social Studies
                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Nuclear Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling a Nuclear Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
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                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Visualizing PET Scans
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Chain Reactions
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                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Study Guide
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                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Observing the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math The Magnifying Power of Telescopes
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Counting Stars
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
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Page 6: 706 S1 318-326 GPS09 - Light-and-Sound - home · PDF fileWhat sound does a ruler make? ... sound waves cannot travel in empty space where there are no particles. ... sound travels

SECTION 1 Sound 323

Pitch and FrequencyYou might be familiar with the music

scale do re mi fa sol la ti do shown inFigure 5 If you were to sing this scale youwould hear the pitch of your voice gethigher Pitch is the human perception ofthe frequency of sound waves Pitch getshigher as the frequency of the sound wavesincreases

Frequency Frequency is a measure of how many wavelengthspass a particular point each second For a compressional wavesuch as sound the frequency is the number of compressions orthe number of rarefactions that pass by each second Frequencyis measured in hertz (Hz) A frequency of 1 Hz means that onecomplete wavelength passes by in 1 s

A healthy human ear can hear sound waves with frequenciesfrom about 20 Hz to 20000 Hz The human ear is most sensi-tive to sounds in the range of 440 Hz to about 7000 Hz In thisrange most people can hear much fainter sounds than they canat higher or lower frequencies

Ultrasonic and Infrasonic Waves Most people canrsquot hearsound frequencies above 20000 Hz which are called ultrasonicwaves Dogs can hear sounds with frequencies up to about35000 Hz and bats can detect frequencies higher than 100000Hz Even though humans canrsquot hear ultrasonic waves they havea number of uses For example ultrasonic waves directed intothe human body are used in medical diagnosis and treatmentUltrasonic waves are reflected by objects underwater and can beused to determine the size shape and depth of underwaterobjects

Infrasonic or subsonic waves have frequencies below20 Hzmdashtoo low for most people to hear These waves are pro-duced by sources that vibrate slowly such as wind heavymachinery and earthquakes Although you canrsquot hear infrasonicwaves you might feel them as a rumble inside your body

The Doppler EffectImagine that you are standing at the side of a racetrack with

race cars zooming past As they move toward you the pitches oftheir engines become higher As they move away the pitchesbecome lower The change in pitch or frequency due to therelative motion of a wave source is called the Doppler effect

Figure 5 Every note has a

different frequency which gives it

a distinct pitch

Describe how pitch changes whenfrequency increases

C

do

262

Hz

D

re

294

Hz

E

mi

330

Hz

F

fa

349

Hz

G

sol

392

Hz

A

la

440

Hz

B

ti

494

Hz

C

do

523

Hz

Comparing IntensityProcedure 1 Complete the safety form

2 Tie the middle of a 50-cm

length of string to a metal

object such as a spoon3 Wrap each end of the

string around a finger on

each hand Place one of

these fingers in each ear

4 Swing the object so it

bumps against a table or

a chair Note the sound

5 Take your fingers out of

your ears and repeat

step 4

Analysis1 Compare the sounds you

heard in both trials

2 Compare the intensity of

the sound waves that

reached your

ears in both

trials

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eng - iTunNORM 000002DB 00000000 0000267E 00000000 0002136D 00000000 00006020 00000000 0000B99C 00000000

324 CHAPTER 11 Sound and Light

A Moving Source of Sound As a race car moves it producessound waves in the form of compressions and rarefactions InFigure 6A the race car creates a compression labeled ACompression A moves through the air toward the flagger By thetime compression B leaves the race car in Figure 6B the car hasmoved forward Because the car has moved since the time it createdcompression A compressions A and B are closer together in frontof the car than they would be if the car had stayed still Because thecompressions are closer together more compressions pass by theflagger each second than if the car had been at rest As a result theflagger hears a higher pitch Figure 6B also shows that the compres-sions behind the moving car are farther apart resulting in a lowerfrequency The flagger hears a lower pitch after the car passes

A Moving Listener You also can hear the Doppler effect whenyou are moving past a sound source that is standing still Supposeyou were riding in a school bus and passed a building with a ring-ing bell The pitch would become higher as you approached thebuilding and lower as you rode away from it The Doppler effecthappens any time the source of a sound is changing position rel-ative to the listener It occurs no matter whether it is the soundsource or the listener that is moving The faster the change inposition the greater the change in frequency and pitch

How does pitch change if you are moving awayfrom a sound source

The race car creates compression A which

spreads through the air in all directions from the

point where it was created

The car is closer to the flagger when it creates

compression B Compressions A and B are closer

together in front of the car so the flagger hears a

higher-pitched sound

Figure 6 The Doppler effect occurs when the

source of a sound wave is moving relative to a

listener

Compression A

Compression B

Compression A

Red Shift The Dopplereffect can also beobserved in light wavesemanating from movingsourcesmdashalthough thesources must be movingat tremendous speedsAstronomers have learnedthat the universe isexpanding by observingthe Doppler effect in lightwaves Research thephenomenon known asred shift and explain inyour Science Journal howit relates to the Dopplereffect

GPS+_324

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9174124

eng - iTunNORM 0000031A 00000000 00001D68 00000000 00006814 00000000 000060FA 00000000 00007D4E 00000000

SECTION 1 Sound 325

Using SoundWhen sound waves strike an object they can be absorbed by

the object transmitted through the object or reflected from theobject By detecting the sound waves reflected from an objectthe size shape and location of an object can be determined

Echolocation and Sonar Some species of bats as well asdolphins whales and other animals use sound waves to detecttheir prey Echolocation is the process of locating objects byemitting sounds and detecting the sound waves that reflect back

Sonar is a system that uses the reflection of underwater soundwaves to detect objects First a sound pulse is emitted underwa-ter The sound waves travel in the water and are reflected whenthey strike an object such as a fish or a ship An underwatermicrophone detects the reflected waves Because the speed ofsound in water is known the distance to the object can be calcu-lated by measuring how much time passes between when thesound pulse is emitted and when the reflected signal is received

USING SONAR A sonar pulse returns in 300 s from a sunken ship that is directly below Find

the depth of the ship if the speed of the pulse is 1500 ms Hint The sonar pulse travels a

distance equal to twice the depth of the ship so use the equation d = st2 to find the depth

known values and the unknown value

Identify the known values

speed of sound in water s 1500 ms

time for round trip t 300 s

Identify the unknown value

depth of the ship d m

the problem

Substitute the known values s 1500 ms and t 300 s into the equation for depth

d s2t

(1500 m2s)(300 s)

12

(4500 m) 2250 m

your answer

Check your answer by dividing the distance by the time and multiplying by 2 The result

should be the speed of sound given in the problem

CHECK

SOLVE

means

means

means

IDENTIFY

Solve a Simple Equation

Find the speed of a sonar pulse that returns in 20 s from a ship at a depth of 1500 m

For more practice problems go to page 879 and visit Math Practice at gpesciencecom

Topic SonarVisit for Web

links to information about ways

sonar is used

Activity Research to find out

the different types of sonar Make

a poster that describes active and

passive sonar

gpesciencecom

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326 CHAPTER 11 Sound and Light

Self Check

1 Explain how sound travels from your vocal cords to

your friendrsquos ears when you talk

2 Explain how the loudness of a sound wave depends on

the intensity of the sound wave

3 Draw and label a diagram that explains the Doppler

effect

4 Describe at least three uses of ultrasonic technology in

medicine

5 Think Critically How could sonar technology be used

to locate deposits of oil and minerals

Summary

Sound Waves

bull Sound waves are compressional waves that

are produced by vibrating objects

bull Sound usually travels fastest in solids and

slowest in gases

bull Sound travels faster as the temperature of

the medium increases

Properties of Sound

bull The amplitude of sound waves increases as

the density of particles increases in the com-

pressions and decreases in rarefactions

bull Loudness is the human perception of the

intensity of sound waves Pitch is the human

perception of the frequency of sound waves

bull The Doppler effect is the change in the fre-

quency of a sound wave when the source of

the sound is moving relative to a listener

6 Calculate Time How long would it take a sound

wave from a car alarm to travel 10 km in air if the air

temperature were 0degC

7 Calculate Distance If sound travels in the ocean with

a speed of 1500 ms how far will a sonar pulse travel

in 45 s

Ultrasound in Medicine High-frequency soundwaves can also be used to remove dirt buildup on jew-elry and glassware One of the most important uses ofultrasonic waves though is in medicine Using spe-cial instruments medical professionals can sendultrasonic waves into a specific part of a patientrsquosbody Reflected ultrasonic waves are used to examinedifferent body parts and to detect and monitor cer-tain types of heart disease and cancer Ultrasoundimaging also is used to monitor the development of afetus as shown in Figure 7 However ultrasound doesnot produce good images of the bones and lungsbecause hard tissues and air absorb the ultrasonicwaves instead of reflecting them

High-frequency sound waves can be used to treatcertain medical problems For example sometimes small harddeposits of calcium compounds or other minerals form in thekidneys making kidney stones In the past physicians had toperform surgery to remove kidney stones Now ultrasonic treat-ments are commonly used to break them up instead Bursts ofultrasound create vibrations that cause the stones to break intosmall pieces that can easily pass out of the body with the urineA similar treatment is available for gallstones

Figure 7 Ultrasonic waves are

directed into a pregnant womanrsquos

uterus to form images of her fetus

More Section Review gpesciencecom

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Opaque

Translucent

Transparent

SECTION 2 Reflection and Refraction of Light 327

The Interaction of Light and MatterLook around your darkened room at night You know that

some of the objects are brightly colored but they look gray orblack in the dim light Turn on the light and you can see all theobjects in the room clearly including their colors What you seedepends on the amount of light in the room and the color of theobjects For you to see an object it must reflect or emit somelight that reaches your eyes

Absorption Transmission and Reflection Objects canabsorb light reflect light and transmit lightmdashallow light to passthrough them The type of matter in an object determines theamount of light it absorbs reflects and transmits For examplethe opaque material in the top candleholder in Figure 8 onlyabsorbs and reflects lightmdashno light passes through it As a resultyou cannot see the candle inside Materials that allow some lightto pass through them like the material of the middle candle-holder in Figure 8 are described as translucent You cannot seeclearly through translucent materials

Transparent materials such as the bottom candleholder inFigure 8 transmit almost all the light striking them so you cansee objects clearly through them Only a small amount of lightis absorbed and reflected by transparent materials

Reflection andRefraction of Light

Reading Guide

Describe how light waves interact

with matter Explain the difference between

regular and diffuse reflection Define the index of refraction of a

material Explain why a prism separates

white light into different colors

The images you see every day are

due to the behavior of light waves

Review Vocabulary

visible light an electromagnetic

wave with wavelengths between

about 400 and 700 billionths of a

meter

New Vocabulary

bull opaque

bull translucent

bull transparent

bull index of refraction

Figure 8 These candleholders

interact with light differently

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328 CHAPTER 11 Sound and Light

Reflection of LightHave you glanced in a mir-

ror today You see your reflec-tion in the mirror when light isreflected off you strikes themirror and is reflected off themirror into your eye Becauselight behaves as a wave itobeys the law of reflection asshown in Figure 9 Recall thataccording to the law of reflec-tion the angle at which a lightwave strikes a surface is thesame as the angle at which it is

reflected Light reflected from any surfacemdasha mirror or a sheetof papermdashobeys this law

Regular and Diffuse Reflection Why can you see yourreflection in a store window but not in a sheet of paper Theanswer has to do with the smoothness of the surfaces A smootheven surface such as a pane of glass produces a sharp image byreflecting parallel light waves in only one direction Reflection oflight waves from a smooth surface is regular reflection To causea regular reflection the roughness of a surface must be less thanthe wavelengths it reflects A sheet of paper has an uneven sur-face that causes incoming parallel light waves to be reflected inmany directions as shown in Figure 10 Reflection of light froma rough surface is diffuse reflection

Scattering Diffuse reflection is a type of scattering thatoccurs when light waves traveling in one direction are made totravel in many different directions Scattering also occurs whenlight waves traveling through the air reflect off small particlesAn example is light scattering off the small water droplets thatmake up a cloud Scattering causes the cloud to appear whiteeven though the droplets are transparent

What is scattering of light

Figure 9 According to the law of

reflection light is reflected so that

the angle of incidence always

equals the angle of reflection

Figure 10 A sheet of paper

has an uneven surface that

produces a diffuse reflection

Explain Use the law ofreflection to explain why arough surface causes parallellight waves to be reflected inmany directions

Mirror

i = angle of

incidence

i

r

i

r

r = angle of

reflection

Normal

Normal

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Refraction of LightWhat occurs when a light wave passes from one material to

anothermdashfrom air to water for example Recall that refractionis caused by a change in the speed of a wave when it passes fromone material to another If the light wave is traveling at an angleto the boundary between the materials and the speed of light isdifferent in the two materials the wave will be bent or refracted

Why does refraction occur

The Index of Refraction The amount of bending that takesplace depends on the speeds of light in both materials Thegreater the change in speed the more the light will be bent asit passes at an angle from one material to the other Figure 11

shows an example of refraction Every material has an index ofrefraction which is the ratio of the speed of light in a vacuum tothe speed of light in the material The index of refraction indi-cates how much the speed of light is reduced in the materialcompared to its speed in empty space

The larger the index of refraction the more light is sloweddown in the material For example because glass has a largerindex of refraction than air light moves more slowly in glassthan air The index of refraction is usually largest for solids andsmallest for gases

Prisms A sparkling glass prism hangs in a sunny windowrefracting the sunlight and projecting a colorful pattern onto thewalls of the room How does the refraction of light create thesecolors The spectrum of colors is produced because the speed oflight in a material also depends on the wave-length of the light In a glass prism light waveswith longer wavelengths such as red light wavesare slowed less than light waves with shorterwavelengths such as blue light waves

Figure 12 shows what occurs when whitelight passes through a prism White light suchas sunlight is made up of light waves withrange of wavelengths from red to blue The tri-angular prism refracts the light twicemdashoncewhen it enters the prism and again when itleaves the prism and reenters the air Becausethe longer wavelengths of light are slowed lessthan the shorter wavelengths are red light isbent the least As a result of these differentamounts of bending the different colors areseparated when they emerge from the prism

Figure 11 The spoon looks

broken because light waves are

refracted as they change speed

when they pass from the water to

the air

329

Figure 12 Refraction causes a

prism to separate a beam of white

light into different colors

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330 CHAPTER 11 Sound and Light

Self Check

1 Compare and contrast opaque transparent and

translucent materials Give one example of each

2 Discuss why you can see your reflection in a smooth

piece of aluminum foil but not in a crumpled ball of foil

3 Infer what happens to light waves that are reflected off

dust particles in the air

4 Explain what happens to white light when it passes

through a prism

5 Think Critically Suppose a material has the same index

of refraction as water How would a light wave change

direction as it traveled from water into this material

Summary

Light and Matter

bull The amount of light that is absorbed

reflected or transmitted depends on the

material making up the object

Reflection of Light

bull Light waves always obey the law of reflection

the angle of incidence equals the angle of

reflection

bull Regular reflection causes parallel light waves

to be reflected in only one direction

bull Diffuse reflection causes parallel light waves

to be reflected in many directions

bull Scattering occurs when light waves are reflected

and travel in many different directions

Refraction of Light

bull Refraction occurs when a light wave changes

speed in moving from one material to another

bull The index of refraction of a material indicates

how much light slows down in the material

6 Find an Angle A light wave strikes a mirror at an

angle of 42deg from the surface of the mirror What

angle does the reflected wave make with the normal

7 Find an Angle A light wave reflects from a mirror at

27deg from the normal What was the angle between

the mirror and the incident wave

Mirages When yoursquore traveling in a car you might see whatlooks like a pool of water on the road ahead As you get closerthe water seems to disappear Yoursquove seen a miragemdashan image ofa distant object produced by the refraction of light through airlayers of different densities Mirages result when the air atground level is much warmer or cooler than the air above asshown in Figure 13 The density of air increases as air cools andlight waves move slower in cooler air than in warmer air As aresult light waves are refracted as they pass through air layerswith different temperatures

Figure 13 Mirages result when

air near the ground is much

warmer or cooler than the air

above This causes light waves

reflected from an object to refract

creating one or more additional

images

MirageWarm air

Cool air

More Section Review gpesciencecom

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SECTION 3 Mirrors Lenses and the Eye 331

Light RaysLight sources send out light waves in all directions These

waves spread out like ripples on the surface of water spread outfrom the point of impact of a pebble You can think of the lightcoming from the source as being many narrow beams of light trav-eling in all directions Each narrow light beam is called a light ray

MirrorsA mirror is any surface that produces a regular reflection A pool

of still water a metal pan and even the back of a shiny spoon can bemirrors Mirrors can be flat curved inward or curved outward

Plane Mirrors A flat smooth mirror is a plane mirror Whenyou look in a plane mirror your image appears upright If youstand 1 m from the mirror your image appears 1 m behind themirror or 2 m from you In fact your image is what a friend stand-ing 2 m from you would see Figure 14 shows how your image isformed First light rays from a light source strike you Every pointthat is struck by the light rays reflects these rays so they travel out-ward in all directions If your friend were looking at you thesereflected light rays coming from you would enter her eyes so shecould see you However if a mirror is placed between you and yourfriend light rays are reflected from the mirror back to your eyes

Mirrors Lenses andthe Eye

Reading Guide

Describe how images are formed

by three types of mirrors Explain how convex and concave

lenses form images Explain how the human eye

enables you to see Describe how lenses are used to

correct vision problems

Mirrors and lenses are used in optical

instruments such as cameras and

telescopes

Review Vocabulary

reflection the process of changing

direction after striking a surface

New Vocabulary

bull plane mirror

bull concave mirror

bull convex mirror

bull convex lens

bull concave lens

Figure 14 Seeing an image of

yourself in a mirror involves two

sets of reflections light rays are

reflected from you and then are

reflected by the mirror

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332 CHAPTER 11 Sound and Light

Virtual and Real Images The forma-tion of an image by a plane mirror isshown in Figure 15 Your brain assumesthat light rays travel in a straight line As aresult rays that enter your eyes seem tocome from behind the mirror This makesthe image seem to be behind the mirrorHowever no light rays actually passthrough the place where the image seemsto be located This type of image is called avirtual image Plane mirrors always formvirtual images If light rays from an objectpass through the location of the image theimage is called a real image Curved mir-rors can form both real and virtual images

Concave Mirrors If the surface of a mirror is curved inwardit is called a concave mirror as shown in Figure 16 The opticalaxis is an imaginary straight line drawn perpendicular to thesurface of the mirror at its center Every light ray traveling par-allel to the optical axis is reflected through a point on the opti-cal axis called the focal point The distance from the center ofthe mirror to the focal point is called the focal length

The image formed by a concave mirror depends on the loca-tion of the object relative to the focal point Figure 16 shows acandle located more than twice the focal length from the mirrorAlthough many light rays come from each point on the candleonly two rays from the same point are shown Ray A passesthrough the focal point and then reflects off the mirror movingparallel to the optical axis Ray B travels parallel to the opticalaxis before reflecting off the mirror and passing through thefocal point The point where the two rays meet is the location ofthe image of the original point on the candle The image formedis a real image because light rays from the candle pass throughthe place where the image is located

Figure 16 Rays A and B start from the same

place on the candle travel in different directions

and meet again on the reflected image

Diagram how two other points on the image ofthe candle are formed

Figure 15 Your brain interprets

the light rays reflected by the

mirror as coming from a point

behind the mirror

Infer how the size of your imagein a plane mirror depends on yourdistance from the mirror

Focalpoint

Optical axis

Ray B

Ray A

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SECTION 3 Mirrors Lenses and the Eye 333

Images Produced by a ConcaveMirror When an object is between oneand two focal lengths from a concavemirror the image is real inverted andlarger than the object An object closerthan one focal length from a concavemirror produces a virtual image that isupright and larger than the object Noimage is produced if the object islocated at the focal point

Convex Mirrors When you are in astore look up toward one of the backcorners or at the end of an aisle to see ifa large rounded mirror is mountedthere You can see a large area of the store in such a mirror Amirror that curves outward like the back of a spoon is called aconvex mirror Light rays that hit a convex mirror diverge orspread apart after they are reflected Figure 17 shows how therays from an object are reflected by a convex mirror to form animage The reflected rays diverge and never meet so a convexmirror forms only a virtual image The image also is upright andsmaller than the actual object is

Describe the image formed by a convex mirror

LensesWhat do your eyes have in common with cameras eyeglasses

and microscopes Each of these contains at least one lens A lens is atransparent object with at least one curved surface that causes lightrays to refract The image that a lens forms depends on the shape ofthe lens Like curved mirrors lenses can be convex or concave

Convex Lenses A convex lens is thicker in the middle than atthe edges Its optical axis is an imaginary straight line that is per-pendicular to the surface of the lens at its thickest point When lightrays approach a convex lens traveling parallel to its opticalaxis the rays are refracted toward the center of the lens asin Figure 18 Light rays traveling along the optical axis arenot bent at all All light rays traveling parallel to the opti-cal axis are refracted so they pass through a single pointwhich is the focal point of the lens The less curved thesides of the lens the less light rays are bent As a resultlenses with flatter sides have longer focal lengths Figure 19

on the next page shows that convex lenses can form eitherreal or virtual images

Figure 18 Convex lenses are

thicker in the middle than at the

edges Light rays that are parallel

to the optical axis are refracted so

that they pass through the focal

point A light ray that passes

through the center of the lens is

not refracted

Figure 17 A convex mirror

forms a reduced upright virtual

image

Optical axis

Ray A

Ray B

Focallength

Focalpoint

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Figure 19

VISUALIZING IMAGES FORMED BY A CONVEX LENS

334 CHAPTER 11 Sound and Light

Aconvex lens can form images that are real or virtual enlarged or reduced and upright orinverted Just as for a concave mirror the type of image formed by a convex lens depends on thelocation of the object relative to the focal point of the lens

Optical axis

One

focal

length

Two

focal

lengthsRay B

Image

Ray A

Object

Focal

point

Optical axis

One

focal

length

Two

focal

lengths

Ray B

Ray AObject

Image

Focal

point

Optical axis

Ray B

ObjectRay A

One

focal

length

Focal

pointImage

If the object is more than two focal lengths from the lens the image formed is real inverted andsmaller than the object As the object moves farther from the lens the image becomes smaller

If the object is between one and two focal lengths from the lens the image formed is real invertedand larger than the object As the object moves closer to the focal point the image becomes larger

If the object is less than one focal length from the lens the image is virtual upright and larger thanthe object The image is virtual because the light rays from the object diverge after they pass throughthe lens The image becomes smaller as the object moves closer to the lens

SECTION 3 Mirrors Lenses and the Eye 335

Concave Lenses A concave lens is thinnerin the middle and thicker at the edges Asshown in Figure 20 light rays that passthrough a concave lens bend away from theoptical axis The rays spread out and nevermeet so a real image is never formed Theimage is always virtual upright and smallerthan the object is Concave lenses are used insome types of eyeglasses and some telescopesConcave lenses usually are used in combinationwith other lenses

What type of image is formed by a concave lens

The Human EyeWhat determines how well you can see the words on this

page If you donrsquot need eyeglasses the structure of your eye givesyou the ability to focus on these words and other objects aroundyou Look at Figure 21 Light enters your eye through a trans-parent covering on your eyeball called the cornea The corneacauses light rays to bend so that they converge The light thenpasses through an opening called the pupil Behind the pupil isa flexible convex lens Muscles attached to the lens change itsshape to help focus light forming a sharp image on your retina

The retina is the inner lining of your eye The retina con-tains light-sensitive cells that convert an image into electricalsignals These signals then are carried along the optic nerve toyour brain to be interpreted With this complex structurethe human eye is capable of seeing clearly in bright and dimconditions focusing on both near and far objects and alsodetecting colors

Figure 20 A concave lens

refracts light rays so they spread

out away from the optical axis

Classify Is a concave lens mostlike a concave mirror or a convexmirror

Optical axis

Retina

Focalpoint

Pupil

Cornea

Lens

Optic nerve

Figure 21 The cornea and lens in your eye

bend light rays so that a sharp image is

formed on the retina

Eye Doctors Optometristsand ophthalmologists treatmany different eye prob-lems They often useadvanced technology todiagnose and correct mal-functioning parts of theeye Research an eye prob-lem and how it is treatedWrite a paragraph describ-ing what parts of the eyeare affected by the problemand how doctors correct it

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336 CHAPTER 11 Sound and Light

Brightness and Intensity The human eye can adjust to thebrightness of the light that strikes it If you step outside on asunny day you may have to shade your eyes against the intensityof the sunlight Light intensity is the amount of light energy thatstrikes a certain area each second Brightness is the human per-ception of light intensity Sunlight seems bright because a largeamount of light energy strikes your retina each second Youreyes respond to bright light by decreasing the size of your pupilThis reduces the amount of light that enters your eye and strikesthe retina

Intensity depends on your distance from a light source Ifyou move away from a bare lightbulb you can see how theintensity of the light rapidly decreases Because light rays spreadout from the source less light energy strikes your retina thefarther away you are from the bulb

Correcting Vision ProblemsIf you have good vision you should be able to see objects

clearly when they are 25 cm or farther away from your eyes Asharp image of an object should be formed on your retinaHowever for many people the image is blurry or formed in thewrong place causing vision problems

Farsightedness If you can see distant objects clearly butcanrsquot bring nearby objects into focus then you are farsighted Inthis case the eyeball might be too short or the lens isnrsquot curvedenough to form a sharp image of nearby objects on the retinaas shown in Figure 22 To correct the problem convex lensescan be used to bend incoming light rays so they converge beforethey enter the eye

Experimenting withFocal LengthsProcedure1 Complete the safety form

2 Fill a glass test tube with

water and seal it with a

lid or stopper3 Type or print SULFUR

DIOXIDE in capital letters

on a piece of paper4 Set the test tube horizon-

tally over the words

Record your observations

5 Hold the tube at several

heights above the words

Record your observations

Analysis1 Describe how the words

changed as the height of

the test tube increased

2 Classify the image at each

height as real or virtual

Focal

point

Correctedfarsighted eye

Light fromnearby object

Focalpoint

Light fromnearby object

Farsighted eye

The focal length of a farsighted eye is too long to form

a sharp image of nearby objects on the retina

A convex lens in front of a farsighted eye enables a sharp

image of nearby objects to be formed on the retina

Figure 22 Farsightedness can

be corrected by convex lenses

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SECTION 3 Mirrors Lenses and the Eye 337

Self Check

1 Diagram how light rays from an object are reflected by

a convex mirror to form an image

2 Infer how the size of the image changes if an object

that is less than one focal length from a concave mirror

moves closer to the mirror

3 Explain how the focal length of a convex lens changes

as the sides of the lens become less curved

4 Compare the image of an object less than one focal

length from a convex lens with the image of an object

more than two focal lengths from the lens

5 Think Critically Describe the image formed by a light

source placed at the focal point of a convex lens

Summary

Mirrors

bull A plane mirror forms upright virtual images

bull The image formed by a concave mirror

depends on the location of the object relative

to the focal point

bull Convex mirrors always produce virtual upright

images that are smaller than the object

Lenses

bull The image formed by a convex lens depends

on the distance of the object from the lens

bull Concave lenses always form virtual upright

images that are smaller than the object

The Eye and Vision

bull The eye contains a lens that changes shape to

produce sharp images on the retina

bull Farsightedness occurs when the eye cannot

form a sharp image of nearby objects

Nearsightedness occurs when the eye cannot

form sharp images of distant objects

6 Calculate Object Distance If you looked through a

convex lens with a focal length of 15 cm and saw a

real inverted enlarged image what is the maximum

distance between the lens and the object

Nearsightedness If you have nearsighted friends you knowthat they can see only nearby objects clearly Their eyes cannotform a sharp image on the retina of an object that is far awayInstead the image is formed in front of the retina as shown inFigure 23 To correct this problem a nearsighted person canwear concave lenses Figure 23 shows how a concave lens causesincoming light rays from distant objects to diverge before theyreach the eye Then the rays can be focused by the eye to form asharp image on the retina

Figure 23 Nearsightedness can

be corrected with concave lenses

Focalpoint

Light fromdistant object

Nearsighted eye

Focalpoint

Light fromdistant object

Correctednearsighted eye

When a nearsighted person looks at distant objects a

sharp image is formed in front of the retina

A concave lens in front of a nearsighted eye makes light

rays diverge so a sharp image is formed on the retina

More Section Review gpesciencecom

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How can you see the back of your head You

can use two mirrors to view a reflection of a

reflection of the back of your head

Real-World ProblemHow many images are seen in two mirrors

Goal Infer how the number of images depends

on the angle between two mirrors

Materialsplane mirrors (2) protractor

masking tape paper clip

Safety Precautions

Handle glass mirrors and paper clips carefully

Procedure1 Complete the safety form

2 Lay one mirror on top of the other with the

mirror surfaces together Tape together one

side so they can open and close Use tape to

label them L and R for left and right

3 Open the mirrors and stand them on a sheet

of paper at an angle of 72deg

4 Bend one leg of a paper clip up 90deg and

place it close to the front of the R mirror

5 Count the number of images of the paper

clip you see in the R and L mirrors Record

these numbers in your data table

6 The mirrors create an image of a circle

divided into wedges Record the number

of wedges

7 Hold the R mirror still and slowly move the Lmirror to 90deg Record the numbers of images

of the clip and wedges in the circle Repeat

this time opening the mirrors to 120deg

Conclude and Apply1 Infer the relationship between the number

of wedges and paper clip images

2 Determine the angle that would divide a

circle into six wedges Hypothesize how

many images would be produced Test your

hypothesis

Reflections of Reflections

Demonstrate for younger students the

relationship between the angle of the

mirrors and the number of reflections

338 CHAPTER 11 Sound and Light

Angle

Number of Number

of Mirrors Paper Clip Images

of Wedges R L

72ordm

90ordm

120ordm

Images and Wedges Seen in the Mirrors

Do not write in this book

SECTION 4 Light and Color 339

Why Objects Have ColorWhy do some apples appear red while others look green or

yellow An objectrsquos color depends on the wavelengths of light itreflects Recall that white light is a blend of all colors of visiblelight When a red apple is struck by white light it reflects redlight back to your eyes and absorbs all of the other colorsFigure 24 shows white light striking a green leaf Only the wave-lengths corresponding to green light are reflected to your eyes

Although some objects appear to be black black isnrsquot acolor Black is the absence of visible light Objects that appearblack absorb all colors of light and reflect little or no light backto your eyes White objects appear to be white because theyreflect all colors of visible light

Why does a white object appear white

Colored Filters Wearing tinted glasses changesthe color of almost everything you see If the lensesare yellow the world takes on a golden glow If theyare rose colored everything looks rosy Somethingsimilar would occur if you placed a colored clearplastic sheet over this white page The paper wouldappear to be the same color as the plastic The plasticsheet and the tinted lenses are filters A filter is atransparent material that transmits one or more col-ors of light but absorbs all others The color of a fil-ter is the color of the light that it transmits

Light and Color

Reading Guide

Explain how you see color Describe the difference between

light color and pigment color Predict what happens when dif-

ferent colors are mixed

From traffic lights to great works of

art color is an important part of your

world

Review Vocabulary

retina inner layer of the eye con-

taining cells that convert light

images into electrical signals

New Vocabulary

bull pigment

Figure 24 This leaf absorbs all

wavelengths of visible light except

the wavelengths you see as green

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340 CHAPTER 11 Sound and Light

Looking Through Colored Filters Figure 25 shows howthe color of an object can change when you look at it throughvarious colored filters The cooler looks blue under white lightbecause it reflects only the wavelengths of blue light that strikeit If you look at the cooler through a blue filter the cooler stilllooks blue because the blue filter transmits the reflected bluelight However if you look at the cooler through a red filter thecooler seems black because the red filter blocks the blue lightreflected by the cooler

Why does a blue object appear black whenviewed through a red filter

Seeing ColorAs you approach a busy intersection the color of the traffic

light changes from green to yellow to red On the cross street thecolor changes from red to green At a busy intersection trafficsafety depends on your ability to detect color changes rapidlyHow do you see colors

Light and the Eye In a healthy eye light enters the eyethrough the cornea is focused by the lens and finally forms animage on the retina The retina is made up of two types of cellsthat absorb light as shown in Figure 26 When these cellsabsorb light energy chemical reactions convert light energy intonerve impulses that are transmitted to the brain One type ofcell in the retina called a cone enables you to distinguish colorsand detailed shapes of objects Cones need bright light to gener-ate nerve impulses so they do not operate in dim light As aresult even brightly colored objects might look gray or black indim light

Figure 25 The color of this

cooler changes when viewed

through different color filters

Topic Color BlindnessVisit for Web

links to information about the

causes of color blindness

Activity Research the causes

and types of color blindness Find

out how cones are related to the

ability to distinguish colors

gpesciencecom

GPS+_340

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973834

eng - iTunNORM 000002EC 00000000 000021E7 00000000 00014224 00000000 00006123 00000000 000146D6 00000000

SECTION 4 Light and Color 341

Cones and Rods Your eyes have three types of cones each ofwhich responds to a different range of wavelengths Red conesrespond to mostly red and yellow light Green cones respond tomostly yellow and green light Blue cones respond to mostlyblue and violet light The second type of cell in the retina calleda rod is sensitive to dim light and enables you to see at nightHowever rod cells do not enable you to see colors

Interpreting Color Why does a bananalook yellow The light reflected by the

banana causes the cone cells that are sensitive to red and greenlight to send signals to your brain Your brain could get the samesignal if a mixture of red light and green light reached your eyesThis mixture also would cause your red and green cones torespond and you would see the color yellow As a result lightwith wavelengths corresponding to yellow light and light that isa mixture of red and green light both cause the color yellow tobe seen What happens when you look at a white shirt You seewhite when all wavelengths of visible light enters your eyes Thenall three sets of cones cells send signals to the brain The com-bination of these signals cause you to see the shirt as white

Color Blindness If one or more of your sets of cone cellsdo not function properly you might not be able to distinguishcertain colors This condition is called color blindness orcolor deficiency About eight percent of men and one-halfpercent of women have some form of color blindness Themost common form of color blindness makes it difficult todistinguish between red and green Figure 27 shows an imagethat is used in a test for redndashgreen color blindness Becausered and green are used in traffic signals drivers and pedestri-ans must be able to identify them

Retina

Rod

Cone

Lens

Figure 27 Color blindness is an

inherited sex-linked condition in

which certain sets of cones in the

retina do not function properly

Identify the number that you seein the dots

Figure 26 Light enters the eye

and focuses on the retina The two

types of light-detecting cells

that make up the retina

are called rods and cones

GPS+_341

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1070482

eng - iTunNORM 00000340 00000000 00002026 00000000 000155F0 00000000 0000607C 00000000 0000097D 00000000

342 CHAPTER 11 Sound and Light

Mixing ColorsIf you have ever browsed through a paint store you have

probably seen displays where customers can select paint samplesof almost every imaginable color The colors are a result of mix-tures of pigments For example you might have mixed blue andyellow paint to produce green paint A pigment is a coloredmaterial that is used to change the color of other substancesThe color of a pigment results from the different wavelengths oflight that the pigment reflects

Mixing Colored Lights From the glowing orange of a sun-set to the deep blue of a mountain lake all the colors you see canbe made by mixing three colors of light These three colorsmdashred green and bluemdashare the primary colors of light They cor-respond to the three different types of cones in the retina ofyour eye When mixed together in equal amounts they producewhite light as Figure 28 shows Mixing the primary colors indifferent proportions can produce the colors you see

What are the primary colors of light

Paint Pigments If you were to mix equal amounts of redgreen and blue paint would you get white paint If mixing col-ors of paint were like mixing colors of light you would but mix-ing paint is different Paints are made with pigments Pigmentsproduce color as a result of the wavelengths of light they reflectPaint pigments usually are made of chemical compounds suchas titanium oxide a bright white pigment and lead chromatewhich is used for painting yellow lines on highways

Figure 28 White light is pro-

duced when the three primary col-

ors of light are mixed in equal

amounts

Color for PhotosynthesisPlant pigments determinethe wavelengths oflight for photosynthesisLeaves usually look greenbecause of the pigmentchlorophyll Chlorophyllabsorbs most wave-lengths of visible lightexcept green which itreflects However not allplants are green Researchdifferent plant pigmentsto find out how they allowplant species to survive indiverse habitats

GPS+_342

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eng - iTunNORM 0000026F 00000000 000023FD 00000000 0000C8EB 00000000 00006149 00000000 000059CB 00000000

SECTION 4 Light and Color 343

Self Check

1 Identity what colors are reflected and what colors are

absorbed if a white light shines on a red shirt

2 Discuss how the primary colors of light differ from the

primary pigment colors

3 Explain why a red apple would appear black if you

looked at it through a blue filter

4 Determine why a white fence appears to be white instead

of multicolored if all colors are present in white light

5 Think Critically Light reflected from an object passes

through a green filter then a red filter and finally a

blue filter What color will the object seem to be

Summary

Why Objects Have Color

bull The color of an object is determined by the

wavelengths of light it reflects

bull The color of a filter is the color of the light the

filter transmits

Seeing Color

bull Rod and cone cells are light-sensitive cells

found in the retina of the human eye

bull Rod cells are sensitive to dim light Cone cells

enable colors to be seen

bull There are three types of cone cells One type

responds to red light another to green light

and another to blue light

Mixing Colors

bull Red green and blue are the primary light

colors Any color of light can be created by

mixing these primary light colors

bull Any pigment color can be formed by mixing

the primary pigment colorsmdashmagenta cyan

and yellow

6 Use Percentages In the human eye there are about

120000000 rods If 90000000 rods trigger at once

what percentage of the total number of rods triggered

7 Convert Units The wavelengths of light are measured

in nanometers (nm) which equals 0000001 mm

Find the wavelength in mm of a light wave that has a

wavelength of 690 nm

Mixing Pigments You can make any pigment color by mixingdifferent amounts of the three primary pigmentsmdashmagenta(bluish red) cyan (greenish blue) and yellow In fact color print-ers use these pigments as well as black ink to make full-colorprints like the pages in this book A primary pigmentrsquos colordepends on the wavelengths of the light that it reflects Actuallypigments both absorb and reflect a range of colors in sending asingle color message to your eye For example in white lightyellow pigment appears yellow because it reflects red and greenlight but absorbs the other wavelengths of visible light The colorof a mixture of two primary pigments is determined by theprimary colors of light that both pigments reflect

Look at Figure 29 The area in the center where the colors alloverlap appears to be black because the three blended primarypigments absorb all the primary colors of light Recall that theprimary colors of light combine to produce white light They arecalled additive colors However when the primary pigment col-ors are combined they absorb all wavelengths of visible light andproduce black Because black results from the absence ofreflected light the primary pigments are called subtractive colors

Figure 29 The three primary

pigment colors appear to be black

when they are mixed

Describe how the primary pigmentcolors are similar to the primary col-ors of light

More Section Review gpesciencecom

GPS+_343

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7230715

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Design Your OwnDesign Your Own

344

Real-World ProblemWhat loud noises do you enjoy and which ones do you find annoying

Most people enjoy a music concert performed by their favorite artist or

the booming displays of fireworks on the Fourth of July Most people

enjoy these loud sounds for short periods of time However certain

other loud noises such as traffic sirens and loud talking can be

annoying Constant annoying noises are called noise pollution What

can be done to reduce noise pollution What types of barriers will best

block out noise pollution

Form a HypothesisBased on your experiences with loud noises form a hypothesis that

predicts the effectiveness of different types of barriers at blocking out

noise pollution

Test Your HypothesisMake a Plan

1 Complete the safety form

2 Decide what type of barriers or materials you will test

3 Describe exactly how you will use these materials

Goals Design an experiment

that tests the effective-

ness of various types of

barriers and materials

for blocking out noise

pollution

Test different types of

materials and barriers

to determine the best

noise blocks

Possible Materialsradio CD player horn

drum or other loud

noise source

shrubs trees concrete

walls brick walls stone

walls wooden fences

parked cars or hanging

laundry

sound meter

meterstick or metric tape

measure

Blocking NfisePollution

4 Identify the controls and variables you will use in your

experiment

5 List the steps you will use and describe each step precisely

6 Prepare a data table in your Science Journal to record your

measurements

7 Organize the steps of your experiment in logical order

Follow Your Plan

1 Ask your teacher to approve your plan and data table before

you start

2 Conduct your experiment as planned

3 Test each barrier two or three times

4 Record the results from each test in your data table in your Science Journal

Analyze Your Data1 Identify the barriers that most effectively reduced noise pollution

2 Identify the barriers that least effectively reduced noise pollution

3 Compare the effective barriers and identify common characteristics that might

explain why they reduced noise pollution

4 Compare the natural barriers you tested with the artificial barriers Which type

of barrier best reduced noise pollution

5 Compare the different types of materials the barriers were made of Which

type of material best reduced noise pollution

Conclude and Apply1 Evaluate whether your results support your hypothesis

2 Predict how your results would differ if you used a louder source of noise such

as a siren

3 Infer from your results how people living near a

busy street could reduce noise pollution

4 Identify major sources of noise pollution in or

near your home How could they be reduced

5 Research how noise pollution can be

unhealthy

LAB 345

Draw a poster illustrating how builders and

landscapers could use certain materials to

better insulate a home or office from excess

noise pollution

346 CHAPTER 11 Sound and Light

A Haiku GardenThe Four Seasons in Poems and Prints

by Stephen Addiss with Fumiko and Akira Yamamoto

Respond to the Reading1 How do the illustrations help the reader

better understand the poems2 What do you think is meant by the

word lingering in the Haiku about springsunlight

3 Linking Science and Writing Writeone haiku about summer and anotherabout fall In one poem use color tohelp you describe the season In theother use light or some property oflight to help describe the season

Research has deter-mined that there is a

connection between color and mood Warmcolors have longer wavelengths and can bemore stimulating Cool colors which haveshorter wavelengths tend to have a calmingor soothing effect on people Light and colorhave long been used as literary symbols Doesthe use of color change what you imaginewhen you read the haiku

UnderstandingLiteratureJapanese Haiku A haiku is a verse thatconsists of three lines and 17 syllables inthe Japanese language The first and thirdlines have five syllables each and themiddle line has seven syllables Why isimagination important in reading haiku

Lingering

in every pool of watermdash

spring sunlightIssa

Withered by winter

the sound of the windmdash

one-color worldBasho

Sound

1 Sound waves are compressional waves thattravel only in matter

2 The speed of sound in a material dependson the type of material as well as itstemperature

3 Loudness depends on a sound waversquos inten-sity Pitch depends on a sound waversquosfrequency

4 Sound waves are used in echolocationsonar and medical imaging

Reflection and Refractionof Light

1 Light can be absorbed reflected or trans-mitted by a material

2 When light waves are reflected theyobey the law of reflectionmdashthe angle ofincidence equals the angle of reflection

3 A light wave is refracted or bent whenit changes speed as it travels at an anglefrom one material to another

Mirrors Lenses andthe Eye

1 Plane mirrors form upright virtual images

2 Images formed by concave mirrors andconvex lenses depend on the location ofthe object relative to the focal point

3 Convex mirrors and concave lenses formvirtual upright images that are smallerthan the object

4 The lens in the human eye changes shape toproduce a sharp image on the retina

Light and Color

1 You see color when light is reflected offobjects and into your eyes

2 Cone cells in the retina are light-sensitivecells that enable you to distinguish colors

3 Red blue and green are the three primarycolors of light and can be mixed to form allother colors

4 The primary pigment colors are magentacyan and yellow

CHAPTER STUDY GUIDE 347

Use the Foldable you made at the beginningof the chapter to help you review sound and light

Interactive Tutor gpesciencecom

Complete each statement with the correctvocabulary word or phrase

1 A change in frequency due to a movingsound source is due to the

2 A flat smooth surface that reflects light andforms an image is a(n)

3 An object is if you can seethrough it clearly

4 The of a material indicates howmuch the speed of light in the materialchanges as light passes through

5 You can change the color of white paint byadding a(n) to it

6 A(n) is a reflecting surface thatcurves outward like the back of a spoon

7 The human perception of the intensity of asound wave is

Choose the word or phrase that best answerseach question

8 Which of the following best describes imageformation by a plane mirrorA) A real image is formed in front of the mirrorB) A real image is formed behind the mirrorC) A virtual image is formed in front of the

mirrorD) A virtual image is formed behind the mirror

9 For a sound with low pitch what else isalso always lowA) amplitude C) wavelengthB) frequency D) wave velocity

10 Which of the following occurs when asound source moves away from youA) The soundrsquos velocity decreasesB) The soundrsquos loudness increasesC) The soundrsquos frequency decreasesD) The soundrsquos frequency increases

Use the table below to answer question 11

11 Based on the data in the table abovewhich of the following would be the speedof sound in air at 30degCA) 3404 ms C) 3494 msB) 3464 ms D) 3534 ms

12 What happens to a light ray travelingparallel to the optical axis of a convexlens that passes through the lensA) It travels parallel to the optical axisB) It passes through the focal pointC) It is bent away from the optical axisD) It forms a virtual image

13 Light waves of which color are bent mostwhen passing through a prismA) blue C) violetB) red D) yellow

14 Which way does a concave lens bend lightA) toward its optical axisB) toward its centerC) toward its edgesD) toward its focal point

Speed of Sound in Air

Temp peed( s)

4

4

4

348 CHAPTER REVIEW

concave lens p 335concave mirror p 332convex lens p 333convex mirror p 333decibel p 322Doppler effect p 323index of refraction p 329intensity p 322

loudness p 322opaque p 327pigment p 342pitch p 323plane mirror p 331translucent p 327transparent p 327

Vocabulary PuzzleMaker gpesciencecom

Use the illustration below to answer question 15

15 Describe how the position of the candlechanged if the image of the candle movedaway from the focal point

16 Apply Acoustic scientists sometimes doresearch in rooms that absorb all soundwaves How could such a room be used tostudy how bats find their food

17 Compare White light passes through atranslucent pane of glass and shines on ashirt Both the translucent glass and theshirt appear green Compare the colors oflight that are absorbed and transmitted bythe glass and the shirt

18 Infer Most mammals including dogs andcats canrsquot see colors Infer how the retinaof a catrsquos eye might be different from theretina of a human eye

19 Determine whether a convex lens could forman image that is enlarged real and upright

20 Infer A car comes to a railroad crossingThe driver hears a trainrsquos whistle and itspitch becomes lower What can beassumed about how the train is moving

21 Compare and contrast the reflection of lightfrom a white wall with a rough surfacewith the reflection of light from a mirror

Optical axis

One

focal

length

Two

focal

lengths

Image

Ray A

Object

Focal

point

Interpreting Graphics 22 Infer why a convex mirror and a concavelens can never produce a real image

23 Predict what color a white shirt wouldappear to be if the light reflected from theshirt passed through a red filter and thenthrough a green filter

24 Explain why windows might begin to rattlewhen an airplane flies overhead

25 Communicate Some people enjoy usingsnowmobiles Others object to the noisethat they make Write a proposal for a pol-icy that seems fair to both groups for theuse of snowmobiles in a state park

CHAPTER REVIEW 349

Use the wave speed equation ν ƒλ to answer

questions 26 and 27

26 Calculate Frequency A sonar pulse has awavelength of 30 cm and a speed inwater of 1500 ms Find its frequency

27 Calculate Wavelength What is the wave-length of a sound wave with a fre-quency of 440 Hz if the speed of soundin air is 340 ms

28 Calculate Angle of Incidence A light ray isreflected from a mirror If the anglebetween the incident ray and thereflected ray is 136deg what is the angleof incidence

29 Determine Object Distance You hold anobject in front of a concave mirror witha focal length of 30 cm If you do notsee a reflected image how far from themirror is the object

30 Calculate Speed The speed of light in avacuum is 300000 kms If the index ofrefraction of water is 133 what is thespeed of light in water

More Chapter Review gpesciencecom

1 Which of the following describes the imageformed by a convex mirror

A enlarged

B inverted

C real

D virtual

Use the figure below to answer question 2

2 Which of the following describes a light raythat passes through the focal point andthen is reflected by the mirror

A It travels parallel to the optical axis

B It forms a real image

C It is reflected back through the focal point

D It forms a virtual image

3 Why does an apple look red

A It reflects red light

B It absorbs red light

C It reflects green and blue light

D It reflects all colors of light except red

Use the figure below to answer questions 4 and 5

4 When the primary colors of light are addedtogether what color appears in area H

A cyan

B magenta

C white

D yellow

5 When the primary colors of light are addedtogether what color appears in area G

A cyan

B magenta

C white

D yellow

6 Which of the following increases as the fre-quency of a sound increases

A amplitude

B intensity

C loudness

D pitch

Red Blue

Green

F

H

G K

Focal pointOptical axis

350 STANDARDIZED TEST PRACTICE

Record your answers on the answer sheet provided by your teacher or on a sheet of paper

STANDARDIZED TEST PRACTICE 351

7 Which of the following parts of the eyeenable you to see colors in bright light

A cone cells

B cornea

C lens

D rod cells

Use the graph below to answer questions 8 and 9

8 Determine how far in centimeters theimage is from the lens when the object is15 centimeters from the lens

9 How far in centimeters is the object fromthe lens when the image distance andobject distance are equal

10 A shirt has stripes that are black and whitein white light If green light shines on thisshirt what colors will the black and whitestripes be

11 If you are on a moving train what hap-pens to the pitch of a crossing bell as youapproach the crossing and then moveaway from the crossing

Use the figure below to answer question 12

12 Describe the vision problem show by thefigure and explain how this vision prob-lem can be corrected

13 Explain why the human eye can see colorsbetter in bright light than in dim light

Image Distance fora Convex Lens

Ima

ge

dis

tan

ce (

cm)

30

25

20

15

10

5 10 15 20 25 30

Object distance (cm)

Standardized Test Practice gpesciencecom

Note Units Read carefully and make note of the units used in

any measurement

  • Glencoe Physical Science with Earth Science
    • Student Edition Table of Contents
      • Unit 1 Science and Technology
        • Chapter 1 The Nature of Science
          • Launch Lab Understanding Measurements
          • Foldables
          • Section 1 The Methods of Science
            • Science Online
            • Integrate History
            • Integrate Earth Science
            • Science Online
              • Section 2 Standards of Measurement
                • Applying Math Centimeters
                • Integrate Earth Science
                • Science Online
                • MiniLAB Determining the Density of a Pencil
                • Visualizing SI Dimensions
                  • Section 3 Communicating with Graphs
                    • Applying Math Temperature
                    • MiniLAB Graphing Temperature Change
                    • Lab Whats my graph
                    • Lab Design Your Own - Developing a Measurement System
                    • Science and Language Arts Thinking in Pictures and Other Reports from My Life with Autism
                      • Chapter 1 Study Guide
                      • Chapter 1 Review
                      • Chapter 1 Standardized Test Practice
                        • Chapter 2 Science Technology and Society
                          • Lab Technology in Your Life
                          • Foldables
                          • Section 1 Science and Technology
                            • MiniLAB Researching the Past
                            • Visualizing Technology Supplying Basic Needs
                            • Science Online
                              • Section 2 Forces that Shape Technology
                                • MiniLAB Evaluating the Benefits and Consequences of Technology
                                • Integrate Environment
                                • Integrate History
                                • Applying Science What impact does the accident at Chernobyl have on the future of nuclear power
                                • Science Online
                                • Lab Who contributes CO2
                                  • Section 3 Developing Technology
                                    • Integrate Life Science
                                    • Integrate Career
                                    • Lab Model and Invent - Care Package
                                    • Oops Accidents in Science A Slippery Situation
                                      • Chapter 2 Study Guide
                                      • Chapter 2 Review
                                      • Chapter 2 Standardized Test Practice
                                          • Unit 2 Motion Forces and Energy
                                            • Chapter 3 Motion Acceleration and Forces
                                              • Launch Lab Compare Speeds
                                              • Foldables
                                              • Section 1 Describing Motion
                                                • MiniLAB Measuring Average Speed
                                                • Science Online
                                                • Applying Math Average Speed
                                                • Integrate Astronomy
                                                • Science Online
                                                  • Section 2 Acceleration
                                                    • Integrate History
                                                    • Visualizing Acceleration
                                                      • Section 3 Motion and Forces
                                                        • Science Online
                                                        • MiniLAB Comparing Friction
                                                        • Lab Force and Acceleration
                                                        • Lab Design Your Own - Comparing Motion from Different Forces
                                                        • Science and Language Arts A Brave and Startling Truth
                                                          • Chapter 3 Study Guide
                                                          • Chapter 3 Review
                                                          • Chapter 3 Standardized Test Practice
                                                            • Chapter 4 The Laws of Motion
                                                              • Launch Lab The Force of Gravity
                                                              • Foldables
                                                              • Section 1 The First Two Laws of Motion
                                                                • MiniLAB Observing Inertia
                                                                • Science Online
                                                                • Applying Math The Acceleration of a Sled Solve a Simple Equation
                                                                  • Section 2 Gravity
                                                                    • Science Online
                                                                    • Integrate Earth Science
                                                                    • MiniLAB Observing Centripetal Force
                                                                    • Lab Gravity and Air Resistance
                                                                      • Section 3 The Third Law of Motion
                                                                        • Integrate Career
                                                                        • Visualizing Rocket Motion
                                                                        • Applying Math The Momentum of a Sprinter
                                                                        • Lab The Momentum of Colliding Objects
                                                                        • Science and History Newton and the Plague
                                                                          • Chapter 4 Study Guide
                                                                          • Chapter 4 Review
                                                                          • Chapter 4 Standardized Test Practice
                                                                            • Chapter 5 Energy
                                                                              • Launch Lab Energy Conversions
                                                                              • Foldables
                                                                              • Section 1 The Nature of Energy
                                                                                • Science Online
                                                                                • Applying Math Kinetic Energy
                                                                                • MiniLAB Interpreting Data from a Slingshot
                                                                                • Integrate Language Arts
                                                                                • Applying Math Gravitational Potential Energy
                                                                                • Lab Bouncing Balls
                                                                                  • Section 2 Conservation of Energy
                                                                                    • Visualizing Energy Transformations
                                                                                    • Integrate Environment
                                                                                    • MiniLAB Transforming Energy in a Paper Clip
                                                                                    • Science Online
                                                                                    • Integrate Health
                                                                                    • Lab Design Your Own - Swinging Energy
                                                                                    • Science and History The Impossible Dream
                                                                                      • Chapter 5 Study Guide
                                                                                      • Chapter 5 Review
                                                                                      • Chapter 5 Standardized Test Practice
                                                                                        • Chapter 6 Work and Machines
                                                                                          • Launch Lab Doing Work with a Simple Machine
                                                                                          • Foldables
                                                                                          • Section 1 Work
                                                                                            • Integrate Language Arts
                                                                                            • Applying Math Work
                                                                                            • MiniLAB Calculating Your Work and Power
                                                                                            • Applying Math Power
                                                                                              • Section 2 Using Machines
                                                                                                • MiniLAB Machines Multiplying Force
                                                                                                • Science Online
                                                                                                • Integrate Chemistry
                                                                                                  • Section 3 Simple Machines
                                                                                                    • Integrate History
                                                                                                    • Visualizing Levers in the Human Body
                                                                                                    • Science Online
                                                                                                    • Lab Levers
                                                                                                    • Lab Model and Invent - Using Simple Machines
                                                                                                    • Science and Society The Science of Very Very Small
                                                                                                      • Chapter 6 Study Guide
                                                                                                      • Chapter 6 Review
                                                                                                      • Chapter 6 Standardized Test Practice
                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                          • Launch Lab Relative Sizes of Earth the Moon and the Sun
                                                                                                          • Foldables
                                                                                                          • Section 1 Earth in Space
                                                                                                            • Science Online
                                                                                                            • Integrate Physics
                                                                                                              • Section 2 Time and Seasons
                                                                                                                • MiniLAB Modeling the Suns Rays at Solstice
                                                                                                                • Lab Comparing the Angle of Sunlight to Intensity
                                                                                                                  • Section 3 Earths Moon
                                                                                                                    • Applying Math Tides
                                                                                                                    • MiniLAB Modeling Phases and Eclipses
                                                                                                                    • Integrate History
                                                                                                                    • Integrate History
                                                                                                                    • Science Online
                                                                                                                    • Visualizing Water on the Moon
                                                                                                                    • Lab Identifying the Moons Surface Features and Apollo Landing Sites
                                                                                                                    • Oops Accidents in Science Even Great Scientists Make Mistakes
                                                                                                                      • Chapter 7 Study Guide
                                                                                                                      • Chapter 7 Review
                                                                                                                      • Chapter 7 Standardized Test Practice
                                                                                                                        • Chapter 8 The Solar System
                                                                                                                          • Launch Lab The Size of the Solar System
                                                                                                                          • Foldables
                                                                                                                          • Section 1 Planet Motion
                                                                                                                            • Integrate History
                                                                                                                            • MiniLAB Plotting Retrograde Motion
                                                                                                                            • Integrate Physics
                                                                                                                            • Applying Math Heliocentric Longitude (HL)
                                                                                                                              • Section 2 The Inner Planets
                                                                                                                                • Science Online
                                                                                                                                • Integrate Chemistry
                                                                                                                                • Lab Interpreting Features of Marss Surface
                                                                                                                                  • Section 3 The Outer Planets
                                                                                                                                    • Integrate Language Arts
                                                                                                                                    • Visualizing What Galileo Saw
                                                                                                                                    • Science Online
                                                                                                                                    • MiniLAB Comparing Sizes of Outer and Inner Planets
                                                                                                                                      • Section 4 Life in the Solar System
                                                                                                                                        • Lab Design Your Own - Testing Unknown Soil Samples for Life
                                                                                                                                        • Science Stats Night Sky Wonders
                                                                                                                                          • Chapter 8 Study Guide
                                                                                                                                          • Chapter 8 Review
                                                                                                                                          • Chapter 8 Standardized Test Practice
                                                                                                                                              • Unit 3 Energy in Motion
                                                                                                                                                • Chapter 9 Heat and States of Matter
                                                                                                                                                  • Launch Lab Expansion of a Gas
                                                                                                                                                  • Foldables
                                                                                                                                                  • Section 1 Temperature and Thermal Energy
                                                                                                                                                    • Applying Math Converting to Celsius
                                                                                                                                                    • Science Online
                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                    • Applying Math Change in Thermal Energy
                                                                                                                                                      • Section 2 States of Matter
                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                        • Science Online
                                                                                                                                                        • MiniLAB Comparing States of Water
                                                                                                                                                          • Section 3 Transferring Thermal Energy
                                                                                                                                                            • MiniLAB Comparing Thermal Conductors
                                                                                                                                                            • Visualizing Convection Currents
                                                                                                                                                            • Lab Convection in Gases and Liquids
                                                                                                                                                              • Section 4 Using Thermal Energy
                                                                                                                                                                • Integrate History
                                                                                                                                                                • Science Online
                                                                                                                                                                • Lab Conduction in Gases
                                                                                                                                                                • Science Stats Surprising Thermal Energy
                                                                                                                                                                  • Chapter 9 Study Guide
                                                                                                                                                                  • Chapter 9 Review
                                                                                                                                                                  • Chapter 9 Standardized Test Practice
                                                                                                                                                                    • Chapter 10 Waves
                                                                                                                                                                      • Launch Lab How do waves transfer energy
                                                                                                                                                                      • Foldables
                                                                                                                                                                      • Section 1 The Nature of Waves
                                                                                                                                                                        • Visualizing Formation of Ocean Waves
                                                                                                                                                                        • Science Online
                                                                                                                                                                          • Section 2 Wave Properties
                                                                                                                                                                            • MiniLAB Observing Wavelength
                                                                                                                                                                            • Integrate Social Studies
                                                                                                                                                                            • Applying Math The Speed of Sound
                                                                                                                                                                            • Lab Wave Speed and Tension
                                                                                                                                                                              • Section 3 The Behavior of Waves
                                                                                                                                                                                • Science Online
                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                • MiniLAB Experimenting with Resonance
                                                                                                                                                                                • Lab Measuring Wave Properties
                                                                                                                                                                                • Science and History Making Waves
                                                                                                                                                                                  • Chapter 10 Study Guide
                                                                                                                                                                                  • Chapter 10 Review
                                                                                                                                                                                  • Chapter 10 Standardized Test Practice
                                                                                                                                                                                    • Chapter 11 Sound and Light
                                                                                                                                                                                      • Launch Lab What sound does a ruler make
                                                                                                                                                                                      • Foldables
                                                                                                                                                                                      • Section 1 Sound
                                                                                                                                                                                        • MiniLAB Comparing Intensity
                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                        • Science Online
                                                                                                                                                                                        • Applying Math Using Sonar
                                                                                                                                                                                          • Section 2 Reflection and Refraction of Light
                                                                                                                                                                                          • Section 3 Mirrors Lenses and the Eye
                                                                                                                                                                                            • Visualizing Images Formed by a Convex Lens
                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                            • MiniLAB Experimenting with Focal Lengths
                                                                                                                                                                                            • Lab Reflections of Reflections
                                                                                                                                                                                              • Section 4 Light and Color
                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Lab Design Your Own - Blocking Noise Pollution
                                                                                                                                                                                                • Science and Language Arts A Haiku Garden The Four Seasons in Poems and Print
                                                                                                                                                                                                  • Chapter 11 Study Guide
                                                                                                                                                                                                  • Chapter 11 Review
                                                                                                                                                                                                  • Chapter 11 Standardized Test Practice
                                                                                                                                                                                                    • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                      • Launch Lab Global Jigsaw Puzzle
                                                                                                                                                                                                      • Foldables
                                                                                                                                                                                                      • Section 1 Evolution of Earths Crust
                                                                                                                                                                                                        • Applying Math Spreading Distances
                                                                                                                                                                                                        • Integrate Physics
                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                          • Section 2 Earthquakes
                                                                                                                                                                                                            • MiniLAB Demonstrating Four Types of Stress
                                                                                                                                                                                                            • Visualizing Earthquake-Proof Buildings
                                                                                                                                                                                                              • Section 3 Earths Interior
                                                                                                                                                                                                              • Section 4 Volcanoes
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • MiniLAB Modeling Lava Viscosity
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                • Lab A Case for Pacific Plate Motion
                                                                                                                                                                                                                • Lab Earthquake Earthquake Wheres the earthquake
                                                                                                                                                                                                                • Science and History Volcano Weather
                                                                                                                                                                                                                  • Chapter 12 Study Guide
                                                                                                                                                                                                                  • Chapter 12 Review
                                                                                                                                                                                                                  • Chapter 12 Standardized Test Practice
                                                                                                                                                                                                                      • Unit 4 Forms of Energy
                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                          • Launch Lab Electric Circuits
                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                          • Section 1 Electric Charge
                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                            • Visualizing Lightning
                                                                                                                                                                                                                            • MiniLAB Investigate Charged Objects
                                                                                                                                                                                                                              • Section 2 Electric Current
                                                                                                                                                                                                                                • MiniLAB Investigating Battery Addition
                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                • Lab Identifying Conductors and Insulators
                                                                                                                                                                                                                                  • Section 3 Electrical Energy
                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                    • Applying Math Power Used by a Clothes Dryer
                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                    • Applying Math Electrical Energy Used by a Microwave Oven
                                                                                                                                                                                                                                    • Lab Design Your Own - Comparing Series and Parallel Circuits
                                                                                                                                                                                                                                    • Science and Language Arts Invisible Man
                                                                                                                                                                                                                                      • Chapter 13 Study Guide
                                                                                                                                                                                                                                      • Chapter 13 Review
                                                                                                                                                                                                                                      • Chapter 13 Standardized Test Practice
                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                          • Launch Lab The Strength of Magnets
                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                          • Section 1 Magnetism
                                                                                                                                                                                                                                            • MiniLAB Observing Magnetic Interference
                                                                                                                                                                                                                                            • Integrate Earth Science
                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                            • Applying Science How can magnetic parts of a junk car be salvaged
                                                                                                                                                                                                                                            • MiniLAB Making Your Own Compass
                                                                                                                                                                                                                                              • Section 2 Electricity and Magnetism
                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                  • Section 3 Producing Electric Current
                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                    • Visualizing Motors and Generators
                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                    • Lab Electricity and Magnetism
                                                                                                                                                                                                                                                    • Lab Design Your Own - Controlling Electromagnets
                                                                                                                                                                                                                                                    • Science and History Body Art
                                                                                                                                                                                                                                                      • Chapter 14 Study Guide
                                                                                                                                                                                                                                                      • Chapter 14 Review
                                                                                                                                                                                                                                                      • Chapter 14 Standardized Test Practice
                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                          • Launch Lab Can electromagnetic waves change materials
                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                          • Section 1 What are electromagnetic waves
                                                                                                                                                                                                                                                            • MiniLAB Investigating Electromagnetic Waves
                                                                                                                                                                                                                                                            • Applying Math The Speed of Light in Water
                                                                                                                                                                                                                                                              • Section 2 The Electromagnetic Spectrum
                                                                                                                                                                                                                                                                • MiniLAB Heating with Microwaves
                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                • Lab The Shape of Satellite Dishes
                                                                                                                                                                                                                                                                  • Section 3 Radio Communication
                                                                                                                                                                                                                                                                    • Visualizing Radio Broadcasts
                                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Lab Use the Internet - Radio Frequencies
                                                                                                                                                                                                                                                                    • Science and History Riding a Beam of Light
                                                                                                                                                                                                                                                                      • Chapter 15 Study Guide
                                                                                                                                                                                                                                                                      • Chapter 15 Review
                                                                                                                                                                                                                                                                      • Chapter 15 Standardized Test Practice
                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                          • Launch Lab Heating with Solar Energy
                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                          • Section 1 Fossil Fuels
                                                                                                                                                                                                                                                                            • Visualizing The Formation of Fossil Fuels
                                                                                                                                                                                                                                                                            • MiniLAB Designing an Efficient Water Heater
                                                                                                                                                                                                                                                                              • Section 2 Nuclear Energy
                                                                                                                                                                                                                                                                                • Integrate Earth Science
                                                                                                                                                                                                                                                                                • Integrate Social Science
                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                • Applying Science Can a contaminated radioactive site be reclaimed
                                                                                                                                                                                                                                                                                  • Section 3 Renewable Energy Sources
                                                                                                                                                                                                                                                                                    • MiniLAB Using Solar Power at Home
                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                    • Lab Solar Heating
                                                                                                                                                                                                                                                                                    • Lab Use the Internet How much does energy really cost
                                                                                                                                                                                                                                                                                    • Science and Society Reacting to Nuclear Energy
                                                                                                                                                                                                                                                                                      • Chapter 16 Study Guide
                                                                                                                                                                                                                                                                                      • Chapter 16 Review
                                                                                                                                                                                                                                                                                      • Chapter 16 Standardized Test Practice
                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                          • Lab Atmospheric Pressure
                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                          • Section 1 Earths Atmosphere
                                                                                                                                                                                                                                                                                            • MiniLAB Visualizing Convection
                                                                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                                                                            • Lab Visualizing a Temperature Inversion
                                                                                                                                                                                                                                                                                              • Section 2 Weather
                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Coriolis Effect
                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                  • Section 3 Climate
                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                    • Visualizing Earths Biogeophysical System
                                                                                                                                                                                                                                                                                                      • Section 4 Earths Changing Climates
                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                        • Applying Math Carbon Dioxide (CO2) Concentration
                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Investigating Microclimate
                                                                                                                                                                                                                                                                                                        • Science and Language Arts The Grapes of Wrath
                                                                                                                                                                                                                                                                                                          • Chapter 17 Study Guide
                                                                                                                                                                                                                                                                                                          • Chapter 17 Review
                                                                                                                                                                                                                                                                                                          • Chapter 17 Standardized Test Practice
                                                                                                                                                                                                                                                                                                              • Unit 5 Matter and Earth Materials
                                                                                                                                                                                                                                                                                                                • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                  • Launch Lab Demonstrate the Distillation of Water
                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                  • Section 1 Composition of Matter
                                                                                                                                                                                                                                                                                                                    • Visualizing Elements
                                                                                                                                                                                                                                                                                                                    • MiniLAB Classifying Materials
                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                    • Lab Comparing Pure Substances and Mixtures
                                                                                                                                                                                                                                                                                                                      • Section 2 Properties of Matter
                                                                                                                                                                                                                                                                                                                        • Integrate Environment
                                                                                                                                                                                                                                                                                                                        • MiniLAB Separating Ink
                                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                                        • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                        • Applying Math The Law of Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Measuring the Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Science Stats Intriguing Elements
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Study Guide
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Review
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                            • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                              • Launch Lab Inferring What You Cant Observe
                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                              • Section 1 Structure of the Atom
                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling an Aluminum Atom
                                                                                                                                                                                                                                                                                                                                • Visualizing The Atomic Model
                                                                                                                                                                                                                                                                                                                                  • Section 2 Masses of Atoms
                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                    • Applying Science How can radioactive isotopes help tell time
                                                                                                                                                                                                                                                                                                                                      • Section 3 The Periodic Table
                                                                                                                                                                                                                                                                                                                                        • MiniLAB Organizing a Personal Periodic Table
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Career
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                                                                                                                                                                        • Lab A Periodic Table of Foods
                                                                                                                                                                                                                                                                                                                                        • Lab Use the Internet Whats in a name
                                                                                                                                                                                                                                                                                                                                        • Science and History A Chilling Story
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Study Guide
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Review
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                            • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                              • Launch Lab Earth Materials at Home and School
                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                              • Section 1 Minerals
                                                                                                                                                                                                                                                                                                                                                • MiniLAB Identifying Salts Crystal System
                                                                                                                                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                • Lab Be a Mineral Detective
                                                                                                                                                                                                                                                                                                                                                  • Section 2 Igneous Rocks
                                                                                                                                                                                                                                                                                                                                                    • Applying Math Extrusive Igneous Rock Classification
                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                      • Section 3 Sedimentary Rocks
                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Evaporites
                                                                                                                                                                                                                                                                                                                                                          • Section 4 Metamorphic Rocks and the Rock Cycle
                                                                                                                                                                                                                                                                                                                                                            • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                            • Visualizing Shock Metamorphic Rock
                                                                                                                                                                                                                                                                                                                                                            • Lab Identifying Rocks
                                                                                                                                                                                                                                                                                                                                                            • Science and Society Earth Materials at Work
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Study Guide
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Review
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                  • Launch Lab Have you got the time
                                                                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                                                                  • Section 1 Weathering and Soil
                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing a Disappearing Seasoning
                                                                                                                                                                                                                                                                                                                                                                    • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                    • Lab Graphing Soil Textures
                                                                                                                                                                                                                                                                                                                                                                      • Section 2 Shaping the Landscape
                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Runoff
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                          • Section 3 Groundwater
                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Porosity Volume
                                                                                                                                                                                                                                                                                                                                                                            • Visualizing The Role of Groundwater in Shaping Earths Surface
                                                                                                                                                                                                                                                                                                                                                                            • Integrate Environment
                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                              • Section 4 Geologic Time
                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                                                                                                • Lab Its about time - relative that is
                                                                                                                                                                                                                                                                                                                                                                                • Science and Society Tapping into the Underground
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Review
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                      • Unit 6 Interactions of Matter
                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                          • Lab Chemical Bonds and Mixing
                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Stability in Bonding
                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                            • Lab Atomic Trading Cards
                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Types of Bonds
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Observing a Bond Type
                                                                                                                                                                                                                                                                                                                                                                                                • Visualizing Polar Molecules
                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Writing Formulas and Naming Compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math Determining a Formula
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Science Can you name binary ionic compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Making a Hydrate
                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Model and Invent - Modeling Chemical Bonding
                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Sticky Subject
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Review
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab RustingmdashA Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Chemical Changes
                                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Designing a Team Equation
                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Chemical Equations
                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math Barium Sulfate Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Classifying Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 4 Reaction Rates and Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing Chemical Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Creating a Colorful Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab To Glow or Not to Glow
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Investigating Reaction Conditions
                                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Clumsy Move Pays Off
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Review
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab Magic Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 How Solutions Form
                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                                                                                                                                                                                                                                                            • Visualizing Metal Alloys
                                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Observing the Effect of Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Solubility and Concentration
                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Acids Bases and Salts
                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing Acid Relief
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Strength of Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Determining Acidity
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Saturated Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and Society Acid Rain
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab The Size of a Nucleus
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Strong Force
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Nuclear Decay
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Detecting Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math The Age of Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Social Studies
                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Nuclear Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling a Nuclear Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Visualizing PET Scans
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Chain Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Model and Invent Modeling Transmutations
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and History The Nuclear Alchemist
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 26 Stars and Galaxies
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab Stars in the Sky
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Observing the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling a Telescope
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math The Magnifying Power of Telescopes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Evolution of Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Counting Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing H-R Diagrams of Star Clusters
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Star Cluster Age
                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 3 Galaxies and the Milky Way
                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 4 Cosmology
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Lab Model and Invent - Expansion of the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Science and Language Arts Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Student Resources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Skill Handbook
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Scientific Methods
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Safety Symbols
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Safety in the Science Laboratory
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Math Skill Handbook
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Math Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Science Applications
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Formulas
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Page 7: 706 S1 318-326 GPS09 - Light-and-Sound - home · PDF fileWhat sound does a ruler make? ... sound waves cannot travel in empty space where there are no particles. ... sound travels

324 CHAPTER 11 Sound and Light

A Moving Source of Sound As a race car moves it producessound waves in the form of compressions and rarefactions InFigure 6A the race car creates a compression labeled ACompression A moves through the air toward the flagger By thetime compression B leaves the race car in Figure 6B the car hasmoved forward Because the car has moved since the time it createdcompression A compressions A and B are closer together in frontof the car than they would be if the car had stayed still Because thecompressions are closer together more compressions pass by theflagger each second than if the car had been at rest As a result theflagger hears a higher pitch Figure 6B also shows that the compres-sions behind the moving car are farther apart resulting in a lowerfrequency The flagger hears a lower pitch after the car passes

A Moving Listener You also can hear the Doppler effect whenyou are moving past a sound source that is standing still Supposeyou were riding in a school bus and passed a building with a ring-ing bell The pitch would become higher as you approached thebuilding and lower as you rode away from it The Doppler effecthappens any time the source of a sound is changing position rel-ative to the listener It occurs no matter whether it is the soundsource or the listener that is moving The faster the change inposition the greater the change in frequency and pitch

How does pitch change if you are moving awayfrom a sound source

The race car creates compression A which

spreads through the air in all directions from the

point where it was created

The car is closer to the flagger when it creates

compression B Compressions A and B are closer

together in front of the car so the flagger hears a

higher-pitched sound

Figure 6 The Doppler effect occurs when the

source of a sound wave is moving relative to a

listener

Compression A

Compression B

Compression A

Red Shift The Dopplereffect can also beobserved in light wavesemanating from movingsourcesmdashalthough thesources must be movingat tremendous speedsAstronomers have learnedthat the universe isexpanding by observingthe Doppler effect in lightwaves Research thephenomenon known asred shift and explain inyour Science Journal howit relates to the Dopplereffect

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SECTION 1 Sound 325

Using SoundWhen sound waves strike an object they can be absorbed by

the object transmitted through the object or reflected from theobject By detecting the sound waves reflected from an objectthe size shape and location of an object can be determined

Echolocation and Sonar Some species of bats as well asdolphins whales and other animals use sound waves to detecttheir prey Echolocation is the process of locating objects byemitting sounds and detecting the sound waves that reflect back

Sonar is a system that uses the reflection of underwater soundwaves to detect objects First a sound pulse is emitted underwa-ter The sound waves travel in the water and are reflected whenthey strike an object such as a fish or a ship An underwatermicrophone detects the reflected waves Because the speed ofsound in water is known the distance to the object can be calcu-lated by measuring how much time passes between when thesound pulse is emitted and when the reflected signal is received

USING SONAR A sonar pulse returns in 300 s from a sunken ship that is directly below Find

the depth of the ship if the speed of the pulse is 1500 ms Hint The sonar pulse travels a

distance equal to twice the depth of the ship so use the equation d = st2 to find the depth

known values and the unknown value

Identify the known values

speed of sound in water s 1500 ms

time for round trip t 300 s

Identify the unknown value

depth of the ship d m

the problem

Substitute the known values s 1500 ms and t 300 s into the equation for depth

d s2t

(1500 m2s)(300 s)

12

(4500 m) 2250 m

your answer

Check your answer by dividing the distance by the time and multiplying by 2 The result

should be the speed of sound given in the problem

CHECK

SOLVE

means

means

means

IDENTIFY

Solve a Simple Equation

Find the speed of a sonar pulse that returns in 20 s from a ship at a depth of 1500 m

For more practice problems go to page 879 and visit Math Practice at gpesciencecom

Topic SonarVisit for Web

links to information about ways

sonar is used

Activity Research to find out

the different types of sonar Make

a poster that describes active and

passive sonar

gpesciencecom

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326 CHAPTER 11 Sound and Light

Self Check

1 Explain how sound travels from your vocal cords to

your friendrsquos ears when you talk

2 Explain how the loudness of a sound wave depends on

the intensity of the sound wave

3 Draw and label a diagram that explains the Doppler

effect

4 Describe at least three uses of ultrasonic technology in

medicine

5 Think Critically How could sonar technology be used

to locate deposits of oil and minerals

Summary

Sound Waves

bull Sound waves are compressional waves that

are produced by vibrating objects

bull Sound usually travels fastest in solids and

slowest in gases

bull Sound travels faster as the temperature of

the medium increases

Properties of Sound

bull The amplitude of sound waves increases as

the density of particles increases in the com-

pressions and decreases in rarefactions

bull Loudness is the human perception of the

intensity of sound waves Pitch is the human

perception of the frequency of sound waves

bull The Doppler effect is the change in the fre-

quency of a sound wave when the source of

the sound is moving relative to a listener

6 Calculate Time How long would it take a sound

wave from a car alarm to travel 10 km in air if the air

temperature were 0degC

7 Calculate Distance If sound travels in the ocean with

a speed of 1500 ms how far will a sonar pulse travel

in 45 s

Ultrasound in Medicine High-frequency soundwaves can also be used to remove dirt buildup on jew-elry and glassware One of the most important uses ofultrasonic waves though is in medicine Using spe-cial instruments medical professionals can sendultrasonic waves into a specific part of a patientrsquosbody Reflected ultrasonic waves are used to examinedifferent body parts and to detect and monitor cer-tain types of heart disease and cancer Ultrasoundimaging also is used to monitor the development of afetus as shown in Figure 7 However ultrasound doesnot produce good images of the bones and lungsbecause hard tissues and air absorb the ultrasonicwaves instead of reflecting them

High-frequency sound waves can be used to treatcertain medical problems For example sometimes small harddeposits of calcium compounds or other minerals form in thekidneys making kidney stones In the past physicians had toperform surgery to remove kidney stones Now ultrasonic treat-ments are commonly used to break them up instead Bursts ofultrasound create vibrations that cause the stones to break intosmall pieces that can easily pass out of the body with the urineA similar treatment is available for gallstones

Figure 7 Ultrasonic waves are

directed into a pregnant womanrsquos

uterus to form images of her fetus

More Section Review gpesciencecom

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Opaque

Translucent

Transparent

SECTION 2 Reflection and Refraction of Light 327

The Interaction of Light and MatterLook around your darkened room at night You know that

some of the objects are brightly colored but they look gray orblack in the dim light Turn on the light and you can see all theobjects in the room clearly including their colors What you seedepends on the amount of light in the room and the color of theobjects For you to see an object it must reflect or emit somelight that reaches your eyes

Absorption Transmission and Reflection Objects canabsorb light reflect light and transmit lightmdashallow light to passthrough them The type of matter in an object determines theamount of light it absorbs reflects and transmits For examplethe opaque material in the top candleholder in Figure 8 onlyabsorbs and reflects lightmdashno light passes through it As a resultyou cannot see the candle inside Materials that allow some lightto pass through them like the material of the middle candle-holder in Figure 8 are described as translucent You cannot seeclearly through translucent materials

Transparent materials such as the bottom candleholder inFigure 8 transmit almost all the light striking them so you cansee objects clearly through them Only a small amount of lightis absorbed and reflected by transparent materials

Reflection andRefraction of Light

Reading Guide

Describe how light waves interact

with matter Explain the difference between

regular and diffuse reflection Define the index of refraction of a

material Explain why a prism separates

white light into different colors

The images you see every day are

due to the behavior of light waves

Review Vocabulary

visible light an electromagnetic

wave with wavelengths between

about 400 and 700 billionths of a

meter

New Vocabulary

bull opaque

bull translucent

bull transparent

bull index of refraction

Figure 8 These candleholders

interact with light differently

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328 CHAPTER 11 Sound and Light

Reflection of LightHave you glanced in a mir-

ror today You see your reflec-tion in the mirror when light isreflected off you strikes themirror and is reflected off themirror into your eye Becauselight behaves as a wave itobeys the law of reflection asshown in Figure 9 Recall thataccording to the law of reflec-tion the angle at which a lightwave strikes a surface is thesame as the angle at which it is

reflected Light reflected from any surfacemdasha mirror or a sheetof papermdashobeys this law

Regular and Diffuse Reflection Why can you see yourreflection in a store window but not in a sheet of paper Theanswer has to do with the smoothness of the surfaces A smootheven surface such as a pane of glass produces a sharp image byreflecting parallel light waves in only one direction Reflection oflight waves from a smooth surface is regular reflection To causea regular reflection the roughness of a surface must be less thanthe wavelengths it reflects A sheet of paper has an uneven sur-face that causes incoming parallel light waves to be reflected inmany directions as shown in Figure 10 Reflection of light froma rough surface is diffuse reflection

Scattering Diffuse reflection is a type of scattering thatoccurs when light waves traveling in one direction are made totravel in many different directions Scattering also occurs whenlight waves traveling through the air reflect off small particlesAn example is light scattering off the small water droplets thatmake up a cloud Scattering causes the cloud to appear whiteeven though the droplets are transparent

What is scattering of light

Figure 9 According to the law of

reflection light is reflected so that

the angle of incidence always

equals the angle of reflection

Figure 10 A sheet of paper

has an uneven surface that

produces a diffuse reflection

Explain Use the law ofreflection to explain why arough surface causes parallellight waves to be reflected inmany directions

Mirror

i = angle of

incidence

i

r

i

r

r = angle of

reflection

Normal

Normal

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Refraction of LightWhat occurs when a light wave passes from one material to

anothermdashfrom air to water for example Recall that refractionis caused by a change in the speed of a wave when it passes fromone material to another If the light wave is traveling at an angleto the boundary between the materials and the speed of light isdifferent in the two materials the wave will be bent or refracted

Why does refraction occur

The Index of Refraction The amount of bending that takesplace depends on the speeds of light in both materials Thegreater the change in speed the more the light will be bent asit passes at an angle from one material to the other Figure 11

shows an example of refraction Every material has an index ofrefraction which is the ratio of the speed of light in a vacuum tothe speed of light in the material The index of refraction indi-cates how much the speed of light is reduced in the materialcompared to its speed in empty space

The larger the index of refraction the more light is sloweddown in the material For example because glass has a largerindex of refraction than air light moves more slowly in glassthan air The index of refraction is usually largest for solids andsmallest for gases

Prisms A sparkling glass prism hangs in a sunny windowrefracting the sunlight and projecting a colorful pattern onto thewalls of the room How does the refraction of light create thesecolors The spectrum of colors is produced because the speed oflight in a material also depends on the wave-length of the light In a glass prism light waveswith longer wavelengths such as red light wavesare slowed less than light waves with shorterwavelengths such as blue light waves

Figure 12 shows what occurs when whitelight passes through a prism White light suchas sunlight is made up of light waves withrange of wavelengths from red to blue The tri-angular prism refracts the light twicemdashoncewhen it enters the prism and again when itleaves the prism and reenters the air Becausethe longer wavelengths of light are slowed lessthan the shorter wavelengths are red light isbent the least As a result of these differentamounts of bending the different colors areseparated when they emerge from the prism

Figure 11 The spoon looks

broken because light waves are

refracted as they change speed

when they pass from the water to

the air

329

Figure 12 Refraction causes a

prism to separate a beam of white

light into different colors

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330 CHAPTER 11 Sound and Light

Self Check

1 Compare and contrast opaque transparent and

translucent materials Give one example of each

2 Discuss why you can see your reflection in a smooth

piece of aluminum foil but not in a crumpled ball of foil

3 Infer what happens to light waves that are reflected off

dust particles in the air

4 Explain what happens to white light when it passes

through a prism

5 Think Critically Suppose a material has the same index

of refraction as water How would a light wave change

direction as it traveled from water into this material

Summary

Light and Matter

bull The amount of light that is absorbed

reflected or transmitted depends on the

material making up the object

Reflection of Light

bull Light waves always obey the law of reflection

the angle of incidence equals the angle of

reflection

bull Regular reflection causes parallel light waves

to be reflected in only one direction

bull Diffuse reflection causes parallel light waves

to be reflected in many directions

bull Scattering occurs when light waves are reflected

and travel in many different directions

Refraction of Light

bull Refraction occurs when a light wave changes

speed in moving from one material to another

bull The index of refraction of a material indicates

how much light slows down in the material

6 Find an Angle A light wave strikes a mirror at an

angle of 42deg from the surface of the mirror What

angle does the reflected wave make with the normal

7 Find an Angle A light wave reflects from a mirror at

27deg from the normal What was the angle between

the mirror and the incident wave

Mirages When yoursquore traveling in a car you might see whatlooks like a pool of water on the road ahead As you get closerthe water seems to disappear Yoursquove seen a miragemdashan image ofa distant object produced by the refraction of light through airlayers of different densities Mirages result when the air atground level is much warmer or cooler than the air above asshown in Figure 13 The density of air increases as air cools andlight waves move slower in cooler air than in warmer air As aresult light waves are refracted as they pass through air layerswith different temperatures

Figure 13 Mirages result when

air near the ground is much

warmer or cooler than the air

above This causes light waves

reflected from an object to refract

creating one or more additional

images

MirageWarm air

Cool air

More Section Review gpesciencecom

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SECTION 3 Mirrors Lenses and the Eye 331

Light RaysLight sources send out light waves in all directions These

waves spread out like ripples on the surface of water spread outfrom the point of impact of a pebble You can think of the lightcoming from the source as being many narrow beams of light trav-eling in all directions Each narrow light beam is called a light ray

MirrorsA mirror is any surface that produces a regular reflection A pool

of still water a metal pan and even the back of a shiny spoon can bemirrors Mirrors can be flat curved inward or curved outward

Plane Mirrors A flat smooth mirror is a plane mirror Whenyou look in a plane mirror your image appears upright If youstand 1 m from the mirror your image appears 1 m behind themirror or 2 m from you In fact your image is what a friend stand-ing 2 m from you would see Figure 14 shows how your image isformed First light rays from a light source strike you Every pointthat is struck by the light rays reflects these rays so they travel out-ward in all directions If your friend were looking at you thesereflected light rays coming from you would enter her eyes so shecould see you However if a mirror is placed between you and yourfriend light rays are reflected from the mirror back to your eyes

Mirrors Lenses andthe Eye

Reading Guide

Describe how images are formed

by three types of mirrors Explain how convex and concave

lenses form images Explain how the human eye

enables you to see Describe how lenses are used to

correct vision problems

Mirrors and lenses are used in optical

instruments such as cameras and

telescopes

Review Vocabulary

reflection the process of changing

direction after striking a surface

New Vocabulary

bull plane mirror

bull concave mirror

bull convex mirror

bull convex lens

bull concave lens

Figure 14 Seeing an image of

yourself in a mirror involves two

sets of reflections light rays are

reflected from you and then are

reflected by the mirror

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332 CHAPTER 11 Sound and Light

Virtual and Real Images The forma-tion of an image by a plane mirror isshown in Figure 15 Your brain assumesthat light rays travel in a straight line As aresult rays that enter your eyes seem tocome from behind the mirror This makesthe image seem to be behind the mirrorHowever no light rays actually passthrough the place where the image seemsto be located This type of image is called avirtual image Plane mirrors always formvirtual images If light rays from an objectpass through the location of the image theimage is called a real image Curved mir-rors can form both real and virtual images

Concave Mirrors If the surface of a mirror is curved inwardit is called a concave mirror as shown in Figure 16 The opticalaxis is an imaginary straight line drawn perpendicular to thesurface of the mirror at its center Every light ray traveling par-allel to the optical axis is reflected through a point on the opti-cal axis called the focal point The distance from the center ofthe mirror to the focal point is called the focal length

The image formed by a concave mirror depends on the loca-tion of the object relative to the focal point Figure 16 shows acandle located more than twice the focal length from the mirrorAlthough many light rays come from each point on the candleonly two rays from the same point are shown Ray A passesthrough the focal point and then reflects off the mirror movingparallel to the optical axis Ray B travels parallel to the opticalaxis before reflecting off the mirror and passing through thefocal point The point where the two rays meet is the location ofthe image of the original point on the candle The image formedis a real image because light rays from the candle pass throughthe place where the image is located

Figure 16 Rays A and B start from the same

place on the candle travel in different directions

and meet again on the reflected image

Diagram how two other points on the image ofthe candle are formed

Figure 15 Your brain interprets

the light rays reflected by the

mirror as coming from a point

behind the mirror

Infer how the size of your imagein a plane mirror depends on yourdistance from the mirror

Focalpoint

Optical axis

Ray B

Ray A

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SECTION 3 Mirrors Lenses and the Eye 333

Images Produced by a ConcaveMirror When an object is between oneand two focal lengths from a concavemirror the image is real inverted andlarger than the object An object closerthan one focal length from a concavemirror produces a virtual image that isupright and larger than the object Noimage is produced if the object islocated at the focal point

Convex Mirrors When you are in astore look up toward one of the backcorners or at the end of an aisle to see ifa large rounded mirror is mountedthere You can see a large area of the store in such a mirror Amirror that curves outward like the back of a spoon is called aconvex mirror Light rays that hit a convex mirror diverge orspread apart after they are reflected Figure 17 shows how therays from an object are reflected by a convex mirror to form animage The reflected rays diverge and never meet so a convexmirror forms only a virtual image The image also is upright andsmaller than the actual object is

Describe the image formed by a convex mirror

LensesWhat do your eyes have in common with cameras eyeglasses

and microscopes Each of these contains at least one lens A lens is atransparent object with at least one curved surface that causes lightrays to refract The image that a lens forms depends on the shape ofthe lens Like curved mirrors lenses can be convex or concave

Convex Lenses A convex lens is thicker in the middle than atthe edges Its optical axis is an imaginary straight line that is per-pendicular to the surface of the lens at its thickest point When lightrays approach a convex lens traveling parallel to its opticalaxis the rays are refracted toward the center of the lens asin Figure 18 Light rays traveling along the optical axis arenot bent at all All light rays traveling parallel to the opti-cal axis are refracted so they pass through a single pointwhich is the focal point of the lens The less curved thesides of the lens the less light rays are bent As a resultlenses with flatter sides have longer focal lengths Figure 19

on the next page shows that convex lenses can form eitherreal or virtual images

Figure 18 Convex lenses are

thicker in the middle than at the

edges Light rays that are parallel

to the optical axis are refracted so

that they pass through the focal

point A light ray that passes

through the center of the lens is

not refracted

Figure 17 A convex mirror

forms a reduced upright virtual

image

Optical axis

Ray A

Ray B

Focallength

Focalpoint

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Figure 19

VISUALIZING IMAGES FORMED BY A CONVEX LENS

334 CHAPTER 11 Sound and Light

Aconvex lens can form images that are real or virtual enlarged or reduced and upright orinverted Just as for a concave mirror the type of image formed by a convex lens depends on thelocation of the object relative to the focal point of the lens

Optical axis

One

focal

length

Two

focal

lengthsRay B

Image

Ray A

Object

Focal

point

Optical axis

One

focal

length

Two

focal

lengths

Ray B

Ray AObject

Image

Focal

point

Optical axis

Ray B

ObjectRay A

One

focal

length

Focal

pointImage

If the object is more than two focal lengths from the lens the image formed is real inverted andsmaller than the object As the object moves farther from the lens the image becomes smaller

If the object is between one and two focal lengths from the lens the image formed is real invertedand larger than the object As the object moves closer to the focal point the image becomes larger

If the object is less than one focal length from the lens the image is virtual upright and larger thanthe object The image is virtual because the light rays from the object diverge after they pass throughthe lens The image becomes smaller as the object moves closer to the lens

SECTION 3 Mirrors Lenses and the Eye 335

Concave Lenses A concave lens is thinnerin the middle and thicker at the edges Asshown in Figure 20 light rays that passthrough a concave lens bend away from theoptical axis The rays spread out and nevermeet so a real image is never formed Theimage is always virtual upright and smallerthan the object is Concave lenses are used insome types of eyeglasses and some telescopesConcave lenses usually are used in combinationwith other lenses

What type of image is formed by a concave lens

The Human EyeWhat determines how well you can see the words on this

page If you donrsquot need eyeglasses the structure of your eye givesyou the ability to focus on these words and other objects aroundyou Look at Figure 21 Light enters your eye through a trans-parent covering on your eyeball called the cornea The corneacauses light rays to bend so that they converge The light thenpasses through an opening called the pupil Behind the pupil isa flexible convex lens Muscles attached to the lens change itsshape to help focus light forming a sharp image on your retina

The retina is the inner lining of your eye The retina con-tains light-sensitive cells that convert an image into electricalsignals These signals then are carried along the optic nerve toyour brain to be interpreted With this complex structurethe human eye is capable of seeing clearly in bright and dimconditions focusing on both near and far objects and alsodetecting colors

Figure 20 A concave lens

refracts light rays so they spread

out away from the optical axis

Classify Is a concave lens mostlike a concave mirror or a convexmirror

Optical axis

Retina

Focalpoint

Pupil

Cornea

Lens

Optic nerve

Figure 21 The cornea and lens in your eye

bend light rays so that a sharp image is

formed on the retina

Eye Doctors Optometristsand ophthalmologists treatmany different eye prob-lems They often useadvanced technology todiagnose and correct mal-functioning parts of theeye Research an eye prob-lem and how it is treatedWrite a paragraph describ-ing what parts of the eyeare affected by the problemand how doctors correct it

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336 CHAPTER 11 Sound and Light

Brightness and Intensity The human eye can adjust to thebrightness of the light that strikes it If you step outside on asunny day you may have to shade your eyes against the intensityof the sunlight Light intensity is the amount of light energy thatstrikes a certain area each second Brightness is the human per-ception of light intensity Sunlight seems bright because a largeamount of light energy strikes your retina each second Youreyes respond to bright light by decreasing the size of your pupilThis reduces the amount of light that enters your eye and strikesthe retina

Intensity depends on your distance from a light source Ifyou move away from a bare lightbulb you can see how theintensity of the light rapidly decreases Because light rays spreadout from the source less light energy strikes your retina thefarther away you are from the bulb

Correcting Vision ProblemsIf you have good vision you should be able to see objects

clearly when they are 25 cm or farther away from your eyes Asharp image of an object should be formed on your retinaHowever for many people the image is blurry or formed in thewrong place causing vision problems

Farsightedness If you can see distant objects clearly butcanrsquot bring nearby objects into focus then you are farsighted Inthis case the eyeball might be too short or the lens isnrsquot curvedenough to form a sharp image of nearby objects on the retinaas shown in Figure 22 To correct the problem convex lensescan be used to bend incoming light rays so they converge beforethey enter the eye

Experimenting withFocal LengthsProcedure1 Complete the safety form

2 Fill a glass test tube with

water and seal it with a

lid or stopper3 Type or print SULFUR

DIOXIDE in capital letters

on a piece of paper4 Set the test tube horizon-

tally over the words

Record your observations

5 Hold the tube at several

heights above the words

Record your observations

Analysis1 Describe how the words

changed as the height of

the test tube increased

2 Classify the image at each

height as real or virtual

Focal

point

Correctedfarsighted eye

Light fromnearby object

Focalpoint

Light fromnearby object

Farsighted eye

The focal length of a farsighted eye is too long to form

a sharp image of nearby objects on the retina

A convex lens in front of a farsighted eye enables a sharp

image of nearby objects to be formed on the retina

Figure 22 Farsightedness can

be corrected by convex lenses

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SECTION 3 Mirrors Lenses and the Eye 337

Self Check

1 Diagram how light rays from an object are reflected by

a convex mirror to form an image

2 Infer how the size of the image changes if an object

that is less than one focal length from a concave mirror

moves closer to the mirror

3 Explain how the focal length of a convex lens changes

as the sides of the lens become less curved

4 Compare the image of an object less than one focal

length from a convex lens with the image of an object

more than two focal lengths from the lens

5 Think Critically Describe the image formed by a light

source placed at the focal point of a convex lens

Summary

Mirrors

bull A plane mirror forms upright virtual images

bull The image formed by a concave mirror

depends on the location of the object relative

to the focal point

bull Convex mirrors always produce virtual upright

images that are smaller than the object

Lenses

bull The image formed by a convex lens depends

on the distance of the object from the lens

bull Concave lenses always form virtual upright

images that are smaller than the object

The Eye and Vision

bull The eye contains a lens that changes shape to

produce sharp images on the retina

bull Farsightedness occurs when the eye cannot

form a sharp image of nearby objects

Nearsightedness occurs when the eye cannot

form sharp images of distant objects

6 Calculate Object Distance If you looked through a

convex lens with a focal length of 15 cm and saw a

real inverted enlarged image what is the maximum

distance between the lens and the object

Nearsightedness If you have nearsighted friends you knowthat they can see only nearby objects clearly Their eyes cannotform a sharp image on the retina of an object that is far awayInstead the image is formed in front of the retina as shown inFigure 23 To correct this problem a nearsighted person canwear concave lenses Figure 23 shows how a concave lens causesincoming light rays from distant objects to diverge before theyreach the eye Then the rays can be focused by the eye to form asharp image on the retina

Figure 23 Nearsightedness can

be corrected with concave lenses

Focalpoint

Light fromdistant object

Nearsighted eye

Focalpoint

Light fromdistant object

Correctednearsighted eye

When a nearsighted person looks at distant objects a

sharp image is formed in front of the retina

A concave lens in front of a nearsighted eye makes light

rays diverge so a sharp image is formed on the retina

More Section Review gpesciencecom

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How can you see the back of your head You

can use two mirrors to view a reflection of a

reflection of the back of your head

Real-World ProblemHow many images are seen in two mirrors

Goal Infer how the number of images depends

on the angle between two mirrors

Materialsplane mirrors (2) protractor

masking tape paper clip

Safety Precautions

Handle glass mirrors and paper clips carefully

Procedure1 Complete the safety form

2 Lay one mirror on top of the other with the

mirror surfaces together Tape together one

side so they can open and close Use tape to

label them L and R for left and right

3 Open the mirrors and stand them on a sheet

of paper at an angle of 72deg

4 Bend one leg of a paper clip up 90deg and

place it close to the front of the R mirror

5 Count the number of images of the paper

clip you see in the R and L mirrors Record

these numbers in your data table

6 The mirrors create an image of a circle

divided into wedges Record the number

of wedges

7 Hold the R mirror still and slowly move the Lmirror to 90deg Record the numbers of images

of the clip and wedges in the circle Repeat

this time opening the mirrors to 120deg

Conclude and Apply1 Infer the relationship between the number

of wedges and paper clip images

2 Determine the angle that would divide a

circle into six wedges Hypothesize how

many images would be produced Test your

hypothesis

Reflections of Reflections

Demonstrate for younger students the

relationship between the angle of the

mirrors and the number of reflections

338 CHAPTER 11 Sound and Light

Angle

Number of Number

of Mirrors Paper Clip Images

of Wedges R L

72ordm

90ordm

120ordm

Images and Wedges Seen in the Mirrors

Do not write in this book

SECTION 4 Light and Color 339

Why Objects Have ColorWhy do some apples appear red while others look green or

yellow An objectrsquos color depends on the wavelengths of light itreflects Recall that white light is a blend of all colors of visiblelight When a red apple is struck by white light it reflects redlight back to your eyes and absorbs all of the other colorsFigure 24 shows white light striking a green leaf Only the wave-lengths corresponding to green light are reflected to your eyes

Although some objects appear to be black black isnrsquot acolor Black is the absence of visible light Objects that appearblack absorb all colors of light and reflect little or no light backto your eyes White objects appear to be white because theyreflect all colors of visible light

Why does a white object appear white

Colored Filters Wearing tinted glasses changesthe color of almost everything you see If the lensesare yellow the world takes on a golden glow If theyare rose colored everything looks rosy Somethingsimilar would occur if you placed a colored clearplastic sheet over this white page The paper wouldappear to be the same color as the plastic The plasticsheet and the tinted lenses are filters A filter is atransparent material that transmits one or more col-ors of light but absorbs all others The color of a fil-ter is the color of the light that it transmits

Light and Color

Reading Guide

Explain how you see color Describe the difference between

light color and pigment color Predict what happens when dif-

ferent colors are mixed

From traffic lights to great works of

art color is an important part of your

world

Review Vocabulary

retina inner layer of the eye con-

taining cells that convert light

images into electrical signals

New Vocabulary

bull pigment

Figure 24 This leaf absorbs all

wavelengths of visible light except

the wavelengths you see as green

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340 CHAPTER 11 Sound and Light

Looking Through Colored Filters Figure 25 shows howthe color of an object can change when you look at it throughvarious colored filters The cooler looks blue under white lightbecause it reflects only the wavelengths of blue light that strikeit If you look at the cooler through a blue filter the cooler stilllooks blue because the blue filter transmits the reflected bluelight However if you look at the cooler through a red filter thecooler seems black because the red filter blocks the blue lightreflected by the cooler

Why does a blue object appear black whenviewed through a red filter

Seeing ColorAs you approach a busy intersection the color of the traffic

light changes from green to yellow to red On the cross street thecolor changes from red to green At a busy intersection trafficsafety depends on your ability to detect color changes rapidlyHow do you see colors

Light and the Eye In a healthy eye light enters the eyethrough the cornea is focused by the lens and finally forms animage on the retina The retina is made up of two types of cellsthat absorb light as shown in Figure 26 When these cellsabsorb light energy chemical reactions convert light energy intonerve impulses that are transmitted to the brain One type ofcell in the retina called a cone enables you to distinguish colorsand detailed shapes of objects Cones need bright light to gener-ate nerve impulses so they do not operate in dim light As aresult even brightly colored objects might look gray or black indim light

Figure 25 The color of this

cooler changes when viewed

through different color filters

Topic Color BlindnessVisit for Web

links to information about the

causes of color blindness

Activity Research the causes

and types of color blindness Find

out how cones are related to the

ability to distinguish colors

gpesciencecom

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SECTION 4 Light and Color 341

Cones and Rods Your eyes have three types of cones each ofwhich responds to a different range of wavelengths Red conesrespond to mostly red and yellow light Green cones respond tomostly yellow and green light Blue cones respond to mostlyblue and violet light The second type of cell in the retina calleda rod is sensitive to dim light and enables you to see at nightHowever rod cells do not enable you to see colors

Interpreting Color Why does a bananalook yellow The light reflected by the

banana causes the cone cells that are sensitive to red and greenlight to send signals to your brain Your brain could get the samesignal if a mixture of red light and green light reached your eyesThis mixture also would cause your red and green cones torespond and you would see the color yellow As a result lightwith wavelengths corresponding to yellow light and light that isa mixture of red and green light both cause the color yellow tobe seen What happens when you look at a white shirt You seewhite when all wavelengths of visible light enters your eyes Thenall three sets of cones cells send signals to the brain The com-bination of these signals cause you to see the shirt as white

Color Blindness If one or more of your sets of cone cellsdo not function properly you might not be able to distinguishcertain colors This condition is called color blindness orcolor deficiency About eight percent of men and one-halfpercent of women have some form of color blindness Themost common form of color blindness makes it difficult todistinguish between red and green Figure 27 shows an imagethat is used in a test for redndashgreen color blindness Becausered and green are used in traffic signals drivers and pedestri-ans must be able to identify them

Retina

Rod

Cone

Lens

Figure 27 Color blindness is an

inherited sex-linked condition in

which certain sets of cones in the

retina do not function properly

Identify the number that you seein the dots

Figure 26 Light enters the eye

and focuses on the retina The two

types of light-detecting cells

that make up the retina

are called rods and cones

GPS+_341

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342 CHAPTER 11 Sound and Light

Mixing ColorsIf you have ever browsed through a paint store you have

probably seen displays where customers can select paint samplesof almost every imaginable color The colors are a result of mix-tures of pigments For example you might have mixed blue andyellow paint to produce green paint A pigment is a coloredmaterial that is used to change the color of other substancesThe color of a pigment results from the different wavelengths oflight that the pigment reflects

Mixing Colored Lights From the glowing orange of a sun-set to the deep blue of a mountain lake all the colors you see canbe made by mixing three colors of light These three colorsmdashred green and bluemdashare the primary colors of light They cor-respond to the three different types of cones in the retina ofyour eye When mixed together in equal amounts they producewhite light as Figure 28 shows Mixing the primary colors indifferent proportions can produce the colors you see

What are the primary colors of light

Paint Pigments If you were to mix equal amounts of redgreen and blue paint would you get white paint If mixing col-ors of paint were like mixing colors of light you would but mix-ing paint is different Paints are made with pigments Pigmentsproduce color as a result of the wavelengths of light they reflectPaint pigments usually are made of chemical compounds suchas titanium oxide a bright white pigment and lead chromatewhich is used for painting yellow lines on highways

Figure 28 White light is pro-

duced when the three primary col-

ors of light are mixed in equal

amounts

Color for PhotosynthesisPlant pigments determinethe wavelengths oflight for photosynthesisLeaves usually look greenbecause of the pigmentchlorophyll Chlorophyllabsorbs most wave-lengths of visible lightexcept green which itreflects However not allplants are green Researchdifferent plant pigmentsto find out how they allowplant species to survive indiverse habitats

GPS+_342

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SECTION 4 Light and Color 343

Self Check

1 Identity what colors are reflected and what colors are

absorbed if a white light shines on a red shirt

2 Discuss how the primary colors of light differ from the

primary pigment colors

3 Explain why a red apple would appear black if you

looked at it through a blue filter

4 Determine why a white fence appears to be white instead

of multicolored if all colors are present in white light

5 Think Critically Light reflected from an object passes

through a green filter then a red filter and finally a

blue filter What color will the object seem to be

Summary

Why Objects Have Color

bull The color of an object is determined by the

wavelengths of light it reflects

bull The color of a filter is the color of the light the

filter transmits

Seeing Color

bull Rod and cone cells are light-sensitive cells

found in the retina of the human eye

bull Rod cells are sensitive to dim light Cone cells

enable colors to be seen

bull There are three types of cone cells One type

responds to red light another to green light

and another to blue light

Mixing Colors

bull Red green and blue are the primary light

colors Any color of light can be created by

mixing these primary light colors

bull Any pigment color can be formed by mixing

the primary pigment colorsmdashmagenta cyan

and yellow

6 Use Percentages In the human eye there are about

120000000 rods If 90000000 rods trigger at once

what percentage of the total number of rods triggered

7 Convert Units The wavelengths of light are measured

in nanometers (nm) which equals 0000001 mm

Find the wavelength in mm of a light wave that has a

wavelength of 690 nm

Mixing Pigments You can make any pigment color by mixingdifferent amounts of the three primary pigmentsmdashmagenta(bluish red) cyan (greenish blue) and yellow In fact color print-ers use these pigments as well as black ink to make full-colorprints like the pages in this book A primary pigmentrsquos colordepends on the wavelengths of the light that it reflects Actuallypigments both absorb and reflect a range of colors in sending asingle color message to your eye For example in white lightyellow pigment appears yellow because it reflects red and greenlight but absorbs the other wavelengths of visible light The colorof a mixture of two primary pigments is determined by theprimary colors of light that both pigments reflect

Look at Figure 29 The area in the center where the colors alloverlap appears to be black because the three blended primarypigments absorb all the primary colors of light Recall that theprimary colors of light combine to produce white light They arecalled additive colors However when the primary pigment col-ors are combined they absorb all wavelengths of visible light andproduce black Because black results from the absence ofreflected light the primary pigments are called subtractive colors

Figure 29 The three primary

pigment colors appear to be black

when they are mixed

Describe how the primary pigmentcolors are similar to the primary col-ors of light

More Section Review gpesciencecom

GPS+_343

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Design Your OwnDesign Your Own

344

Real-World ProblemWhat loud noises do you enjoy and which ones do you find annoying

Most people enjoy a music concert performed by their favorite artist or

the booming displays of fireworks on the Fourth of July Most people

enjoy these loud sounds for short periods of time However certain

other loud noises such as traffic sirens and loud talking can be

annoying Constant annoying noises are called noise pollution What

can be done to reduce noise pollution What types of barriers will best

block out noise pollution

Form a HypothesisBased on your experiences with loud noises form a hypothesis that

predicts the effectiveness of different types of barriers at blocking out

noise pollution

Test Your HypothesisMake a Plan

1 Complete the safety form

2 Decide what type of barriers or materials you will test

3 Describe exactly how you will use these materials

Goals Design an experiment

that tests the effective-

ness of various types of

barriers and materials

for blocking out noise

pollution

Test different types of

materials and barriers

to determine the best

noise blocks

Possible Materialsradio CD player horn

drum or other loud

noise source

shrubs trees concrete

walls brick walls stone

walls wooden fences

parked cars or hanging

laundry

sound meter

meterstick or metric tape

measure

Blocking NfisePollution

4 Identify the controls and variables you will use in your

experiment

5 List the steps you will use and describe each step precisely

6 Prepare a data table in your Science Journal to record your

measurements

7 Organize the steps of your experiment in logical order

Follow Your Plan

1 Ask your teacher to approve your plan and data table before

you start

2 Conduct your experiment as planned

3 Test each barrier two or three times

4 Record the results from each test in your data table in your Science Journal

Analyze Your Data1 Identify the barriers that most effectively reduced noise pollution

2 Identify the barriers that least effectively reduced noise pollution

3 Compare the effective barriers and identify common characteristics that might

explain why they reduced noise pollution

4 Compare the natural barriers you tested with the artificial barriers Which type

of barrier best reduced noise pollution

5 Compare the different types of materials the barriers were made of Which

type of material best reduced noise pollution

Conclude and Apply1 Evaluate whether your results support your hypothesis

2 Predict how your results would differ if you used a louder source of noise such

as a siren

3 Infer from your results how people living near a

busy street could reduce noise pollution

4 Identify major sources of noise pollution in or

near your home How could they be reduced

5 Research how noise pollution can be

unhealthy

LAB 345

Draw a poster illustrating how builders and

landscapers could use certain materials to

better insulate a home or office from excess

noise pollution

346 CHAPTER 11 Sound and Light

A Haiku GardenThe Four Seasons in Poems and Prints

by Stephen Addiss with Fumiko and Akira Yamamoto

Respond to the Reading1 How do the illustrations help the reader

better understand the poems2 What do you think is meant by the

word lingering in the Haiku about springsunlight

3 Linking Science and Writing Writeone haiku about summer and anotherabout fall In one poem use color tohelp you describe the season In theother use light or some property oflight to help describe the season

Research has deter-mined that there is a

connection between color and mood Warmcolors have longer wavelengths and can bemore stimulating Cool colors which haveshorter wavelengths tend to have a calmingor soothing effect on people Light and colorhave long been used as literary symbols Doesthe use of color change what you imaginewhen you read the haiku

UnderstandingLiteratureJapanese Haiku A haiku is a verse thatconsists of three lines and 17 syllables inthe Japanese language The first and thirdlines have five syllables each and themiddle line has seven syllables Why isimagination important in reading haiku

Lingering

in every pool of watermdash

spring sunlightIssa

Withered by winter

the sound of the windmdash

one-color worldBasho

Sound

1 Sound waves are compressional waves thattravel only in matter

2 The speed of sound in a material dependson the type of material as well as itstemperature

3 Loudness depends on a sound waversquos inten-sity Pitch depends on a sound waversquosfrequency

4 Sound waves are used in echolocationsonar and medical imaging

Reflection and Refractionof Light

1 Light can be absorbed reflected or trans-mitted by a material

2 When light waves are reflected theyobey the law of reflectionmdashthe angle ofincidence equals the angle of reflection

3 A light wave is refracted or bent whenit changes speed as it travels at an anglefrom one material to another

Mirrors Lenses andthe Eye

1 Plane mirrors form upright virtual images

2 Images formed by concave mirrors andconvex lenses depend on the location ofthe object relative to the focal point

3 Convex mirrors and concave lenses formvirtual upright images that are smallerthan the object

4 The lens in the human eye changes shape toproduce a sharp image on the retina

Light and Color

1 You see color when light is reflected offobjects and into your eyes

2 Cone cells in the retina are light-sensitivecells that enable you to distinguish colors

3 Red blue and green are the three primarycolors of light and can be mixed to form allother colors

4 The primary pigment colors are magentacyan and yellow

CHAPTER STUDY GUIDE 347

Use the Foldable you made at the beginningof the chapter to help you review sound and light

Interactive Tutor gpesciencecom

Complete each statement with the correctvocabulary word or phrase

1 A change in frequency due to a movingsound source is due to the

2 A flat smooth surface that reflects light andforms an image is a(n)

3 An object is if you can seethrough it clearly

4 The of a material indicates howmuch the speed of light in the materialchanges as light passes through

5 You can change the color of white paint byadding a(n) to it

6 A(n) is a reflecting surface thatcurves outward like the back of a spoon

7 The human perception of the intensity of asound wave is

Choose the word or phrase that best answerseach question

8 Which of the following best describes imageformation by a plane mirrorA) A real image is formed in front of the mirrorB) A real image is formed behind the mirrorC) A virtual image is formed in front of the

mirrorD) A virtual image is formed behind the mirror

9 For a sound with low pitch what else isalso always lowA) amplitude C) wavelengthB) frequency D) wave velocity

10 Which of the following occurs when asound source moves away from youA) The soundrsquos velocity decreasesB) The soundrsquos loudness increasesC) The soundrsquos frequency decreasesD) The soundrsquos frequency increases

Use the table below to answer question 11

11 Based on the data in the table abovewhich of the following would be the speedof sound in air at 30degCA) 3404 ms C) 3494 msB) 3464 ms D) 3534 ms

12 What happens to a light ray travelingparallel to the optical axis of a convexlens that passes through the lensA) It travels parallel to the optical axisB) It passes through the focal pointC) It is bent away from the optical axisD) It forms a virtual image

13 Light waves of which color are bent mostwhen passing through a prismA) blue C) violetB) red D) yellow

14 Which way does a concave lens bend lightA) toward its optical axisB) toward its centerC) toward its edgesD) toward its focal point

Speed of Sound in Air

Temp peed( s)

4

4

4

348 CHAPTER REVIEW

concave lens p 335concave mirror p 332convex lens p 333convex mirror p 333decibel p 322Doppler effect p 323index of refraction p 329intensity p 322

loudness p 322opaque p 327pigment p 342pitch p 323plane mirror p 331translucent p 327transparent p 327

Vocabulary PuzzleMaker gpesciencecom

Use the illustration below to answer question 15

15 Describe how the position of the candlechanged if the image of the candle movedaway from the focal point

16 Apply Acoustic scientists sometimes doresearch in rooms that absorb all soundwaves How could such a room be used tostudy how bats find their food

17 Compare White light passes through atranslucent pane of glass and shines on ashirt Both the translucent glass and theshirt appear green Compare the colors oflight that are absorbed and transmitted bythe glass and the shirt

18 Infer Most mammals including dogs andcats canrsquot see colors Infer how the retinaof a catrsquos eye might be different from theretina of a human eye

19 Determine whether a convex lens could forman image that is enlarged real and upright

20 Infer A car comes to a railroad crossingThe driver hears a trainrsquos whistle and itspitch becomes lower What can beassumed about how the train is moving

21 Compare and contrast the reflection of lightfrom a white wall with a rough surfacewith the reflection of light from a mirror

Optical axis

One

focal

length

Two

focal

lengths

Image

Ray A

Object

Focal

point

Interpreting Graphics 22 Infer why a convex mirror and a concavelens can never produce a real image

23 Predict what color a white shirt wouldappear to be if the light reflected from theshirt passed through a red filter and thenthrough a green filter

24 Explain why windows might begin to rattlewhen an airplane flies overhead

25 Communicate Some people enjoy usingsnowmobiles Others object to the noisethat they make Write a proposal for a pol-icy that seems fair to both groups for theuse of snowmobiles in a state park

CHAPTER REVIEW 349

Use the wave speed equation ν ƒλ to answer

questions 26 and 27

26 Calculate Frequency A sonar pulse has awavelength of 30 cm and a speed inwater of 1500 ms Find its frequency

27 Calculate Wavelength What is the wave-length of a sound wave with a fre-quency of 440 Hz if the speed of soundin air is 340 ms

28 Calculate Angle of Incidence A light ray isreflected from a mirror If the anglebetween the incident ray and thereflected ray is 136deg what is the angleof incidence

29 Determine Object Distance You hold anobject in front of a concave mirror witha focal length of 30 cm If you do notsee a reflected image how far from themirror is the object

30 Calculate Speed The speed of light in avacuum is 300000 kms If the index ofrefraction of water is 133 what is thespeed of light in water

More Chapter Review gpesciencecom

1 Which of the following describes the imageformed by a convex mirror

A enlarged

B inverted

C real

D virtual

Use the figure below to answer question 2

2 Which of the following describes a light raythat passes through the focal point andthen is reflected by the mirror

A It travels parallel to the optical axis

B It forms a real image

C It is reflected back through the focal point

D It forms a virtual image

3 Why does an apple look red

A It reflects red light

B It absorbs red light

C It reflects green and blue light

D It reflects all colors of light except red

Use the figure below to answer questions 4 and 5

4 When the primary colors of light are addedtogether what color appears in area H

A cyan

B magenta

C white

D yellow

5 When the primary colors of light are addedtogether what color appears in area G

A cyan

B magenta

C white

D yellow

6 Which of the following increases as the fre-quency of a sound increases

A amplitude

B intensity

C loudness

D pitch

Red Blue

Green

F

H

G K

Focal pointOptical axis

350 STANDARDIZED TEST PRACTICE

Record your answers on the answer sheet provided by your teacher or on a sheet of paper

STANDARDIZED TEST PRACTICE 351

7 Which of the following parts of the eyeenable you to see colors in bright light

A cone cells

B cornea

C lens

D rod cells

Use the graph below to answer questions 8 and 9

8 Determine how far in centimeters theimage is from the lens when the object is15 centimeters from the lens

9 How far in centimeters is the object fromthe lens when the image distance andobject distance are equal

10 A shirt has stripes that are black and whitein white light If green light shines on thisshirt what colors will the black and whitestripes be

11 If you are on a moving train what hap-pens to the pitch of a crossing bell as youapproach the crossing and then moveaway from the crossing

Use the figure below to answer question 12

12 Describe the vision problem show by thefigure and explain how this vision prob-lem can be corrected

13 Explain why the human eye can see colorsbetter in bright light than in dim light

Image Distance fora Convex Lens

Ima

ge

dis

tan

ce (

cm)

30

25

20

15

10

5 10 15 20 25 30

Object distance (cm)

Standardized Test Practice gpesciencecom

Note Units Read carefully and make note of the units used in

any measurement

  • Glencoe Physical Science with Earth Science
    • Student Edition Table of Contents
      • Unit 1 Science and Technology
        • Chapter 1 The Nature of Science
          • Launch Lab Understanding Measurements
          • Foldables
          • Section 1 The Methods of Science
            • Science Online
            • Integrate History
            • Integrate Earth Science
            • Science Online
              • Section 2 Standards of Measurement
                • Applying Math Centimeters
                • Integrate Earth Science
                • Science Online
                • MiniLAB Determining the Density of a Pencil
                • Visualizing SI Dimensions
                  • Section 3 Communicating with Graphs
                    • Applying Math Temperature
                    • MiniLAB Graphing Temperature Change
                    • Lab Whats my graph
                    • Lab Design Your Own - Developing a Measurement System
                    • Science and Language Arts Thinking in Pictures and Other Reports from My Life with Autism
                      • Chapter 1 Study Guide
                      • Chapter 1 Review
                      • Chapter 1 Standardized Test Practice
                        • Chapter 2 Science Technology and Society
                          • Lab Technology in Your Life
                          • Foldables
                          • Section 1 Science and Technology
                            • MiniLAB Researching the Past
                            • Visualizing Technology Supplying Basic Needs
                            • Science Online
                              • Section 2 Forces that Shape Technology
                                • MiniLAB Evaluating the Benefits and Consequences of Technology
                                • Integrate Environment
                                • Integrate History
                                • Applying Science What impact does the accident at Chernobyl have on the future of nuclear power
                                • Science Online
                                • Lab Who contributes CO2
                                  • Section 3 Developing Technology
                                    • Integrate Life Science
                                    • Integrate Career
                                    • Lab Model and Invent - Care Package
                                    • Oops Accidents in Science A Slippery Situation
                                      • Chapter 2 Study Guide
                                      • Chapter 2 Review
                                      • Chapter 2 Standardized Test Practice
                                          • Unit 2 Motion Forces and Energy
                                            • Chapter 3 Motion Acceleration and Forces
                                              • Launch Lab Compare Speeds
                                              • Foldables
                                              • Section 1 Describing Motion
                                                • MiniLAB Measuring Average Speed
                                                • Science Online
                                                • Applying Math Average Speed
                                                • Integrate Astronomy
                                                • Science Online
                                                  • Section 2 Acceleration
                                                    • Integrate History
                                                    • Visualizing Acceleration
                                                      • Section 3 Motion and Forces
                                                        • Science Online
                                                        • MiniLAB Comparing Friction
                                                        • Lab Force and Acceleration
                                                        • Lab Design Your Own - Comparing Motion from Different Forces
                                                        • Science and Language Arts A Brave and Startling Truth
                                                          • Chapter 3 Study Guide
                                                          • Chapter 3 Review
                                                          • Chapter 3 Standardized Test Practice
                                                            • Chapter 4 The Laws of Motion
                                                              • Launch Lab The Force of Gravity
                                                              • Foldables
                                                              • Section 1 The First Two Laws of Motion
                                                                • MiniLAB Observing Inertia
                                                                • Science Online
                                                                • Applying Math The Acceleration of a Sled Solve a Simple Equation
                                                                  • Section 2 Gravity
                                                                    • Science Online
                                                                    • Integrate Earth Science
                                                                    • MiniLAB Observing Centripetal Force
                                                                    • Lab Gravity and Air Resistance
                                                                      • Section 3 The Third Law of Motion
                                                                        • Integrate Career
                                                                        • Visualizing Rocket Motion
                                                                        • Applying Math The Momentum of a Sprinter
                                                                        • Lab The Momentum of Colliding Objects
                                                                        • Science and History Newton and the Plague
                                                                          • Chapter 4 Study Guide
                                                                          • Chapter 4 Review
                                                                          • Chapter 4 Standardized Test Practice
                                                                            • Chapter 5 Energy
                                                                              • Launch Lab Energy Conversions
                                                                              • Foldables
                                                                              • Section 1 The Nature of Energy
                                                                                • Science Online
                                                                                • Applying Math Kinetic Energy
                                                                                • MiniLAB Interpreting Data from a Slingshot
                                                                                • Integrate Language Arts
                                                                                • Applying Math Gravitational Potential Energy
                                                                                • Lab Bouncing Balls
                                                                                  • Section 2 Conservation of Energy
                                                                                    • Visualizing Energy Transformations
                                                                                    • Integrate Environment
                                                                                    • MiniLAB Transforming Energy in a Paper Clip
                                                                                    • Science Online
                                                                                    • Integrate Health
                                                                                    • Lab Design Your Own - Swinging Energy
                                                                                    • Science and History The Impossible Dream
                                                                                      • Chapter 5 Study Guide
                                                                                      • Chapter 5 Review
                                                                                      • Chapter 5 Standardized Test Practice
                                                                                        • Chapter 6 Work and Machines
                                                                                          • Launch Lab Doing Work with a Simple Machine
                                                                                          • Foldables
                                                                                          • Section 1 Work
                                                                                            • Integrate Language Arts
                                                                                            • Applying Math Work
                                                                                            • MiniLAB Calculating Your Work and Power
                                                                                            • Applying Math Power
                                                                                              • Section 2 Using Machines
                                                                                                • MiniLAB Machines Multiplying Force
                                                                                                • Science Online
                                                                                                • Integrate Chemistry
                                                                                                  • Section 3 Simple Machines
                                                                                                    • Integrate History
                                                                                                    • Visualizing Levers in the Human Body
                                                                                                    • Science Online
                                                                                                    • Lab Levers
                                                                                                    • Lab Model and Invent - Using Simple Machines
                                                                                                    • Science and Society The Science of Very Very Small
                                                                                                      • Chapter 6 Study Guide
                                                                                                      • Chapter 6 Review
                                                                                                      • Chapter 6 Standardized Test Practice
                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                          • Launch Lab Relative Sizes of Earth the Moon and the Sun
                                                                                                          • Foldables
                                                                                                          • Section 1 Earth in Space
                                                                                                            • Science Online
                                                                                                            • Integrate Physics
                                                                                                              • Section 2 Time and Seasons
                                                                                                                • MiniLAB Modeling the Suns Rays at Solstice
                                                                                                                • Lab Comparing the Angle of Sunlight to Intensity
                                                                                                                  • Section 3 Earths Moon
                                                                                                                    • Applying Math Tides
                                                                                                                    • MiniLAB Modeling Phases and Eclipses
                                                                                                                    • Integrate History
                                                                                                                    • Integrate History
                                                                                                                    • Science Online
                                                                                                                    • Visualizing Water on the Moon
                                                                                                                    • Lab Identifying the Moons Surface Features and Apollo Landing Sites
                                                                                                                    • Oops Accidents in Science Even Great Scientists Make Mistakes
                                                                                                                      • Chapter 7 Study Guide
                                                                                                                      • Chapter 7 Review
                                                                                                                      • Chapter 7 Standardized Test Practice
                                                                                                                        • Chapter 8 The Solar System
                                                                                                                          • Launch Lab The Size of the Solar System
                                                                                                                          • Foldables
                                                                                                                          • Section 1 Planet Motion
                                                                                                                            • Integrate History
                                                                                                                            • MiniLAB Plotting Retrograde Motion
                                                                                                                            • Integrate Physics
                                                                                                                            • Applying Math Heliocentric Longitude (HL)
                                                                                                                              • Section 2 The Inner Planets
                                                                                                                                • Science Online
                                                                                                                                • Integrate Chemistry
                                                                                                                                • Lab Interpreting Features of Marss Surface
                                                                                                                                  • Section 3 The Outer Planets
                                                                                                                                    • Integrate Language Arts
                                                                                                                                    • Visualizing What Galileo Saw
                                                                                                                                    • Science Online
                                                                                                                                    • MiniLAB Comparing Sizes of Outer and Inner Planets
                                                                                                                                      • Section 4 Life in the Solar System
                                                                                                                                        • Lab Design Your Own - Testing Unknown Soil Samples for Life
                                                                                                                                        • Science Stats Night Sky Wonders
                                                                                                                                          • Chapter 8 Study Guide
                                                                                                                                          • Chapter 8 Review
                                                                                                                                          • Chapter 8 Standardized Test Practice
                                                                                                                                              • Unit 3 Energy in Motion
                                                                                                                                                • Chapter 9 Heat and States of Matter
                                                                                                                                                  • Launch Lab Expansion of a Gas
                                                                                                                                                  • Foldables
                                                                                                                                                  • Section 1 Temperature and Thermal Energy
                                                                                                                                                    • Applying Math Converting to Celsius
                                                                                                                                                    • Science Online
                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                    • Applying Math Change in Thermal Energy
                                                                                                                                                      • Section 2 States of Matter
                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                        • Science Online
                                                                                                                                                        • MiniLAB Comparing States of Water
                                                                                                                                                          • Section 3 Transferring Thermal Energy
                                                                                                                                                            • MiniLAB Comparing Thermal Conductors
                                                                                                                                                            • Visualizing Convection Currents
                                                                                                                                                            • Lab Convection in Gases and Liquids
                                                                                                                                                              • Section 4 Using Thermal Energy
                                                                                                                                                                • Integrate History
                                                                                                                                                                • Science Online
                                                                                                                                                                • Lab Conduction in Gases
                                                                                                                                                                • Science Stats Surprising Thermal Energy
                                                                                                                                                                  • Chapter 9 Study Guide
                                                                                                                                                                  • Chapter 9 Review
                                                                                                                                                                  • Chapter 9 Standardized Test Practice
                                                                                                                                                                    • Chapter 10 Waves
                                                                                                                                                                      • Launch Lab How do waves transfer energy
                                                                                                                                                                      • Foldables
                                                                                                                                                                      • Section 1 The Nature of Waves
                                                                                                                                                                        • Visualizing Formation of Ocean Waves
                                                                                                                                                                        • Science Online
                                                                                                                                                                          • Section 2 Wave Properties
                                                                                                                                                                            • MiniLAB Observing Wavelength
                                                                                                                                                                            • Integrate Social Studies
                                                                                                                                                                            • Applying Math The Speed of Sound
                                                                                                                                                                            • Lab Wave Speed and Tension
                                                                                                                                                                              • Section 3 The Behavior of Waves
                                                                                                                                                                                • Science Online
                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                • MiniLAB Experimenting with Resonance
                                                                                                                                                                                • Lab Measuring Wave Properties
                                                                                                                                                                                • Science and History Making Waves
                                                                                                                                                                                  • Chapter 10 Study Guide
                                                                                                                                                                                  • Chapter 10 Review
                                                                                                                                                                                  • Chapter 10 Standardized Test Practice
                                                                                                                                                                                    • Chapter 11 Sound and Light
                                                                                                                                                                                      • Launch Lab What sound does a ruler make
                                                                                                                                                                                      • Foldables
                                                                                                                                                                                      • Section 1 Sound
                                                                                                                                                                                        • MiniLAB Comparing Intensity
                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                        • Science Online
                                                                                                                                                                                        • Applying Math Using Sonar
                                                                                                                                                                                          • Section 2 Reflection and Refraction of Light
                                                                                                                                                                                          • Section 3 Mirrors Lenses and the Eye
                                                                                                                                                                                            • Visualizing Images Formed by a Convex Lens
                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                            • MiniLAB Experimenting with Focal Lengths
                                                                                                                                                                                            • Lab Reflections of Reflections
                                                                                                                                                                                              • Section 4 Light and Color
                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Lab Design Your Own - Blocking Noise Pollution
                                                                                                                                                                                                • Science and Language Arts A Haiku Garden The Four Seasons in Poems and Print
                                                                                                                                                                                                  • Chapter 11 Study Guide
                                                                                                                                                                                                  • Chapter 11 Review
                                                                                                                                                                                                  • Chapter 11 Standardized Test Practice
                                                                                                                                                                                                    • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                      • Launch Lab Global Jigsaw Puzzle
                                                                                                                                                                                                      • Foldables
                                                                                                                                                                                                      • Section 1 Evolution of Earths Crust
                                                                                                                                                                                                        • Applying Math Spreading Distances
                                                                                                                                                                                                        • Integrate Physics
                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                          • Section 2 Earthquakes
                                                                                                                                                                                                            • MiniLAB Demonstrating Four Types of Stress
                                                                                                                                                                                                            • Visualizing Earthquake-Proof Buildings
                                                                                                                                                                                                              • Section 3 Earths Interior
                                                                                                                                                                                                              • Section 4 Volcanoes
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • MiniLAB Modeling Lava Viscosity
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                • Lab A Case for Pacific Plate Motion
                                                                                                                                                                                                                • Lab Earthquake Earthquake Wheres the earthquake
                                                                                                                                                                                                                • Science and History Volcano Weather
                                                                                                                                                                                                                  • Chapter 12 Study Guide
                                                                                                                                                                                                                  • Chapter 12 Review
                                                                                                                                                                                                                  • Chapter 12 Standardized Test Practice
                                                                                                                                                                                                                      • Unit 4 Forms of Energy
                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                          • Launch Lab Electric Circuits
                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                          • Section 1 Electric Charge
                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                            • Visualizing Lightning
                                                                                                                                                                                                                            • MiniLAB Investigate Charged Objects
                                                                                                                                                                                                                              • Section 2 Electric Current
                                                                                                                                                                                                                                • MiniLAB Investigating Battery Addition
                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                • Lab Identifying Conductors and Insulators
                                                                                                                                                                                                                                  • Section 3 Electrical Energy
                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                    • Applying Math Power Used by a Clothes Dryer
                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                    • Applying Math Electrical Energy Used by a Microwave Oven
                                                                                                                                                                                                                                    • Lab Design Your Own - Comparing Series and Parallel Circuits
                                                                                                                                                                                                                                    • Science and Language Arts Invisible Man
                                                                                                                                                                                                                                      • Chapter 13 Study Guide
                                                                                                                                                                                                                                      • Chapter 13 Review
                                                                                                                                                                                                                                      • Chapter 13 Standardized Test Practice
                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                          • Launch Lab The Strength of Magnets
                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                          • Section 1 Magnetism
                                                                                                                                                                                                                                            • MiniLAB Observing Magnetic Interference
                                                                                                                                                                                                                                            • Integrate Earth Science
                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                            • Applying Science How can magnetic parts of a junk car be salvaged
                                                                                                                                                                                                                                            • MiniLAB Making Your Own Compass
                                                                                                                                                                                                                                              • Section 2 Electricity and Magnetism
                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                  • Section 3 Producing Electric Current
                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                    • Visualizing Motors and Generators
                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                    • Lab Electricity and Magnetism
                                                                                                                                                                                                                                                    • Lab Design Your Own - Controlling Electromagnets
                                                                                                                                                                                                                                                    • Science and History Body Art
                                                                                                                                                                                                                                                      • Chapter 14 Study Guide
                                                                                                                                                                                                                                                      • Chapter 14 Review
                                                                                                                                                                                                                                                      • Chapter 14 Standardized Test Practice
                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                          • Launch Lab Can electromagnetic waves change materials
                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                          • Section 1 What are electromagnetic waves
                                                                                                                                                                                                                                                            • MiniLAB Investigating Electromagnetic Waves
                                                                                                                                                                                                                                                            • Applying Math The Speed of Light in Water
                                                                                                                                                                                                                                                              • Section 2 The Electromagnetic Spectrum
                                                                                                                                                                                                                                                                • MiniLAB Heating with Microwaves
                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                • Lab The Shape of Satellite Dishes
                                                                                                                                                                                                                                                                  • Section 3 Radio Communication
                                                                                                                                                                                                                                                                    • Visualizing Radio Broadcasts
                                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Lab Use the Internet - Radio Frequencies
                                                                                                                                                                                                                                                                    • Science and History Riding a Beam of Light
                                                                                                                                                                                                                                                                      • Chapter 15 Study Guide
                                                                                                                                                                                                                                                                      • Chapter 15 Review
                                                                                                                                                                                                                                                                      • Chapter 15 Standardized Test Practice
                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                          • Launch Lab Heating with Solar Energy
                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                          • Section 1 Fossil Fuels
                                                                                                                                                                                                                                                                            • Visualizing The Formation of Fossil Fuels
                                                                                                                                                                                                                                                                            • MiniLAB Designing an Efficient Water Heater
                                                                                                                                                                                                                                                                              • Section 2 Nuclear Energy
                                                                                                                                                                                                                                                                                • Integrate Earth Science
                                                                                                                                                                                                                                                                                • Integrate Social Science
                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                • Applying Science Can a contaminated radioactive site be reclaimed
                                                                                                                                                                                                                                                                                  • Section 3 Renewable Energy Sources
                                                                                                                                                                                                                                                                                    • MiniLAB Using Solar Power at Home
                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                    • Lab Solar Heating
                                                                                                                                                                                                                                                                                    • Lab Use the Internet How much does energy really cost
                                                                                                                                                                                                                                                                                    • Science and Society Reacting to Nuclear Energy
                                                                                                                                                                                                                                                                                      • Chapter 16 Study Guide
                                                                                                                                                                                                                                                                                      • Chapter 16 Review
                                                                                                                                                                                                                                                                                      • Chapter 16 Standardized Test Practice
                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                          • Lab Atmospheric Pressure
                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                          • Section 1 Earths Atmosphere
                                                                                                                                                                                                                                                                                            • MiniLAB Visualizing Convection
                                                                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                                                                            • Lab Visualizing a Temperature Inversion
                                                                                                                                                                                                                                                                                              • Section 2 Weather
                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Coriolis Effect
                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                  • Section 3 Climate
                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                    • Visualizing Earths Biogeophysical System
                                                                                                                                                                                                                                                                                                      • Section 4 Earths Changing Climates
                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                        • Applying Math Carbon Dioxide (CO2) Concentration
                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Investigating Microclimate
                                                                                                                                                                                                                                                                                                        • Science and Language Arts The Grapes of Wrath
                                                                                                                                                                                                                                                                                                          • Chapter 17 Study Guide
                                                                                                                                                                                                                                                                                                          • Chapter 17 Review
                                                                                                                                                                                                                                                                                                          • Chapter 17 Standardized Test Practice
                                                                                                                                                                                                                                                                                                              • Unit 5 Matter and Earth Materials
                                                                                                                                                                                                                                                                                                                • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                  • Launch Lab Demonstrate the Distillation of Water
                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                  • Section 1 Composition of Matter
                                                                                                                                                                                                                                                                                                                    • Visualizing Elements
                                                                                                                                                                                                                                                                                                                    • MiniLAB Classifying Materials
                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                    • Lab Comparing Pure Substances and Mixtures
                                                                                                                                                                                                                                                                                                                      • Section 2 Properties of Matter
                                                                                                                                                                                                                                                                                                                        • Integrate Environment
                                                                                                                                                                                                                                                                                                                        • MiniLAB Separating Ink
                                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                                        • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                        • Applying Math The Law of Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Measuring the Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Science Stats Intriguing Elements
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Study Guide
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Review
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                            • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                              • Launch Lab Inferring What You Cant Observe
                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                              • Section 1 Structure of the Atom
                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling an Aluminum Atom
                                                                                                                                                                                                                                                                                                                                • Visualizing The Atomic Model
                                                                                                                                                                                                                                                                                                                                  • Section 2 Masses of Atoms
                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                    • Applying Science How can radioactive isotopes help tell time
                                                                                                                                                                                                                                                                                                                                      • Section 3 The Periodic Table
                                                                                                                                                                                                                                                                                                                                        • MiniLAB Organizing a Personal Periodic Table
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Career
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                                                                                                                                                                        • Lab A Periodic Table of Foods
                                                                                                                                                                                                                                                                                                                                        • Lab Use the Internet Whats in a name
                                                                                                                                                                                                                                                                                                                                        • Science and History A Chilling Story
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Study Guide
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Review
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                            • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                              • Launch Lab Earth Materials at Home and School
                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                              • Section 1 Minerals
                                                                                                                                                                                                                                                                                                                                                • MiniLAB Identifying Salts Crystal System
                                                                                                                                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                • Lab Be a Mineral Detective
                                                                                                                                                                                                                                                                                                                                                  • Section 2 Igneous Rocks
                                                                                                                                                                                                                                                                                                                                                    • Applying Math Extrusive Igneous Rock Classification
                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                      • Section 3 Sedimentary Rocks
                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Evaporites
                                                                                                                                                                                                                                                                                                                                                          • Section 4 Metamorphic Rocks and the Rock Cycle
                                                                                                                                                                                                                                                                                                                                                            • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                            • Visualizing Shock Metamorphic Rock
                                                                                                                                                                                                                                                                                                                                                            • Lab Identifying Rocks
                                                                                                                                                                                                                                                                                                                                                            • Science and Society Earth Materials at Work
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Study Guide
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Review
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                  • Launch Lab Have you got the time
                                                                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                                                                  • Section 1 Weathering and Soil
                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing a Disappearing Seasoning
                                                                                                                                                                                                                                                                                                                                                                    • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                    • Lab Graphing Soil Textures
                                                                                                                                                                                                                                                                                                                                                                      • Section 2 Shaping the Landscape
                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Runoff
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                          • Section 3 Groundwater
                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Porosity Volume
                                                                                                                                                                                                                                                                                                                                                                            • Visualizing The Role of Groundwater in Shaping Earths Surface
                                                                                                                                                                                                                                                                                                                                                                            • Integrate Environment
                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                              • Section 4 Geologic Time
                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                                                                                                • Lab Its about time - relative that is
                                                                                                                                                                                                                                                                                                                                                                                • Science and Society Tapping into the Underground
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Review
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                      • Unit 6 Interactions of Matter
                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                          • Lab Chemical Bonds and Mixing
                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Stability in Bonding
                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                            • Lab Atomic Trading Cards
                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Types of Bonds
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Observing a Bond Type
                                                                                                                                                                                                                                                                                                                                                                                                • Visualizing Polar Molecules
                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Writing Formulas and Naming Compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math Determining a Formula
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Science Can you name binary ionic compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Making a Hydrate
                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Model and Invent - Modeling Chemical Bonding
                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Sticky Subject
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Review
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab RustingmdashA Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Chemical Changes
                                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Designing a Team Equation
                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Chemical Equations
                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math Barium Sulfate Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Classifying Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 4 Reaction Rates and Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing Chemical Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Creating a Colorful Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab To Glow or Not to Glow
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Investigating Reaction Conditions
                                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Clumsy Move Pays Off
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Review
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab Magic Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 How Solutions Form
                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                                                                                                                                                                                                                                                            • Visualizing Metal Alloys
                                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Observing the Effect of Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Solubility and Concentration
                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Acids Bases and Salts
                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing Acid Relief
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Strength of Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Determining Acidity
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Saturated Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and Society Acid Rain
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab The Size of a Nucleus
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Strong Force
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Nuclear Decay
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Detecting Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math The Age of Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Social Studies
                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Nuclear Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling a Nuclear Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Visualizing PET Scans
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Chain Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Model and Invent Modeling Transmutations
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and History The Nuclear Alchemist
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Study Guide
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                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 26 Stars and Galaxies
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab Stars in the Sky
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Observing the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling a Telescope
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math The Magnifying Power of Telescopes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Evolution of Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Counting Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing H-R Diagrams of Star Clusters
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Star Cluster Age
                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 3 Galaxies and the Milky Way
                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 4 Cosmology
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Lab Model and Invent - Expansion of the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Science and Language Arts Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Study Guide
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 3 Motion Acceleration and Forces
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 4 The Laws of Motion
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 5 Energy
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 6 Work and Machines
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 8 The Solar System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 9 Heat and States of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 10 Waves
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 11 Sound and Light
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 14 Magnetism
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 18 Classification of Matter
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 20 Earth Materials
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Page 8: 706 S1 318-326 GPS09 - Light-and-Sound - home · PDF fileWhat sound does a ruler make? ... sound waves cannot travel in empty space where there are no particles. ... sound travels

SECTION 1 Sound 325

Using SoundWhen sound waves strike an object they can be absorbed by

the object transmitted through the object or reflected from theobject By detecting the sound waves reflected from an objectthe size shape and location of an object can be determined

Echolocation and Sonar Some species of bats as well asdolphins whales and other animals use sound waves to detecttheir prey Echolocation is the process of locating objects byemitting sounds and detecting the sound waves that reflect back

Sonar is a system that uses the reflection of underwater soundwaves to detect objects First a sound pulse is emitted underwa-ter The sound waves travel in the water and are reflected whenthey strike an object such as a fish or a ship An underwatermicrophone detects the reflected waves Because the speed ofsound in water is known the distance to the object can be calcu-lated by measuring how much time passes between when thesound pulse is emitted and when the reflected signal is received

USING SONAR A sonar pulse returns in 300 s from a sunken ship that is directly below Find

the depth of the ship if the speed of the pulse is 1500 ms Hint The sonar pulse travels a

distance equal to twice the depth of the ship so use the equation d = st2 to find the depth

known values and the unknown value

Identify the known values

speed of sound in water s 1500 ms

time for round trip t 300 s

Identify the unknown value

depth of the ship d m

the problem

Substitute the known values s 1500 ms and t 300 s into the equation for depth

d s2t

(1500 m2s)(300 s)

12

(4500 m) 2250 m

your answer

Check your answer by dividing the distance by the time and multiplying by 2 The result

should be the speed of sound given in the problem

CHECK

SOLVE

means

means

means

IDENTIFY

Solve a Simple Equation

Find the speed of a sonar pulse that returns in 20 s from a ship at a depth of 1500 m

For more practice problems go to page 879 and visit Math Practice at gpesciencecom

Topic SonarVisit for Web

links to information about ways

sonar is used

Activity Research to find out

the different types of sonar Make

a poster that describes active and

passive sonar

gpesciencecom

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326 CHAPTER 11 Sound and Light

Self Check

1 Explain how sound travels from your vocal cords to

your friendrsquos ears when you talk

2 Explain how the loudness of a sound wave depends on

the intensity of the sound wave

3 Draw and label a diagram that explains the Doppler

effect

4 Describe at least three uses of ultrasonic technology in

medicine

5 Think Critically How could sonar technology be used

to locate deposits of oil and minerals

Summary

Sound Waves

bull Sound waves are compressional waves that

are produced by vibrating objects

bull Sound usually travels fastest in solids and

slowest in gases

bull Sound travels faster as the temperature of

the medium increases

Properties of Sound

bull The amplitude of sound waves increases as

the density of particles increases in the com-

pressions and decreases in rarefactions

bull Loudness is the human perception of the

intensity of sound waves Pitch is the human

perception of the frequency of sound waves

bull The Doppler effect is the change in the fre-

quency of a sound wave when the source of

the sound is moving relative to a listener

6 Calculate Time How long would it take a sound

wave from a car alarm to travel 10 km in air if the air

temperature were 0degC

7 Calculate Distance If sound travels in the ocean with

a speed of 1500 ms how far will a sonar pulse travel

in 45 s

Ultrasound in Medicine High-frequency soundwaves can also be used to remove dirt buildup on jew-elry and glassware One of the most important uses ofultrasonic waves though is in medicine Using spe-cial instruments medical professionals can sendultrasonic waves into a specific part of a patientrsquosbody Reflected ultrasonic waves are used to examinedifferent body parts and to detect and monitor cer-tain types of heart disease and cancer Ultrasoundimaging also is used to monitor the development of afetus as shown in Figure 7 However ultrasound doesnot produce good images of the bones and lungsbecause hard tissues and air absorb the ultrasonicwaves instead of reflecting them

High-frequency sound waves can be used to treatcertain medical problems For example sometimes small harddeposits of calcium compounds or other minerals form in thekidneys making kidney stones In the past physicians had toperform surgery to remove kidney stones Now ultrasonic treat-ments are commonly used to break them up instead Bursts ofultrasound create vibrations that cause the stones to break intosmall pieces that can easily pass out of the body with the urineA similar treatment is available for gallstones

Figure 7 Ultrasonic waves are

directed into a pregnant womanrsquos

uterus to form images of her fetus

More Section Review gpesciencecom

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Opaque

Translucent

Transparent

SECTION 2 Reflection and Refraction of Light 327

The Interaction of Light and MatterLook around your darkened room at night You know that

some of the objects are brightly colored but they look gray orblack in the dim light Turn on the light and you can see all theobjects in the room clearly including their colors What you seedepends on the amount of light in the room and the color of theobjects For you to see an object it must reflect or emit somelight that reaches your eyes

Absorption Transmission and Reflection Objects canabsorb light reflect light and transmit lightmdashallow light to passthrough them The type of matter in an object determines theamount of light it absorbs reflects and transmits For examplethe opaque material in the top candleholder in Figure 8 onlyabsorbs and reflects lightmdashno light passes through it As a resultyou cannot see the candle inside Materials that allow some lightto pass through them like the material of the middle candle-holder in Figure 8 are described as translucent You cannot seeclearly through translucent materials

Transparent materials such as the bottom candleholder inFigure 8 transmit almost all the light striking them so you cansee objects clearly through them Only a small amount of lightis absorbed and reflected by transparent materials

Reflection andRefraction of Light

Reading Guide

Describe how light waves interact

with matter Explain the difference between

regular and diffuse reflection Define the index of refraction of a

material Explain why a prism separates

white light into different colors

The images you see every day are

due to the behavior of light waves

Review Vocabulary

visible light an electromagnetic

wave with wavelengths between

about 400 and 700 billionths of a

meter

New Vocabulary

bull opaque

bull translucent

bull transparent

bull index of refraction

Figure 8 These candleholders

interact with light differently

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328 CHAPTER 11 Sound and Light

Reflection of LightHave you glanced in a mir-

ror today You see your reflec-tion in the mirror when light isreflected off you strikes themirror and is reflected off themirror into your eye Becauselight behaves as a wave itobeys the law of reflection asshown in Figure 9 Recall thataccording to the law of reflec-tion the angle at which a lightwave strikes a surface is thesame as the angle at which it is

reflected Light reflected from any surfacemdasha mirror or a sheetof papermdashobeys this law

Regular and Diffuse Reflection Why can you see yourreflection in a store window but not in a sheet of paper Theanswer has to do with the smoothness of the surfaces A smootheven surface such as a pane of glass produces a sharp image byreflecting parallel light waves in only one direction Reflection oflight waves from a smooth surface is regular reflection To causea regular reflection the roughness of a surface must be less thanthe wavelengths it reflects A sheet of paper has an uneven sur-face that causes incoming parallel light waves to be reflected inmany directions as shown in Figure 10 Reflection of light froma rough surface is diffuse reflection

Scattering Diffuse reflection is a type of scattering thatoccurs when light waves traveling in one direction are made totravel in many different directions Scattering also occurs whenlight waves traveling through the air reflect off small particlesAn example is light scattering off the small water droplets thatmake up a cloud Scattering causes the cloud to appear whiteeven though the droplets are transparent

What is scattering of light

Figure 9 According to the law of

reflection light is reflected so that

the angle of incidence always

equals the angle of reflection

Figure 10 A sheet of paper

has an uneven surface that

produces a diffuse reflection

Explain Use the law ofreflection to explain why arough surface causes parallellight waves to be reflected inmany directions

Mirror

i = angle of

incidence

i

r

i

r

r = angle of

reflection

Normal

Normal

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Refraction of LightWhat occurs when a light wave passes from one material to

anothermdashfrom air to water for example Recall that refractionis caused by a change in the speed of a wave when it passes fromone material to another If the light wave is traveling at an angleto the boundary between the materials and the speed of light isdifferent in the two materials the wave will be bent or refracted

Why does refraction occur

The Index of Refraction The amount of bending that takesplace depends on the speeds of light in both materials Thegreater the change in speed the more the light will be bent asit passes at an angle from one material to the other Figure 11

shows an example of refraction Every material has an index ofrefraction which is the ratio of the speed of light in a vacuum tothe speed of light in the material The index of refraction indi-cates how much the speed of light is reduced in the materialcompared to its speed in empty space

The larger the index of refraction the more light is sloweddown in the material For example because glass has a largerindex of refraction than air light moves more slowly in glassthan air The index of refraction is usually largest for solids andsmallest for gases

Prisms A sparkling glass prism hangs in a sunny windowrefracting the sunlight and projecting a colorful pattern onto thewalls of the room How does the refraction of light create thesecolors The spectrum of colors is produced because the speed oflight in a material also depends on the wave-length of the light In a glass prism light waveswith longer wavelengths such as red light wavesare slowed less than light waves with shorterwavelengths such as blue light waves

Figure 12 shows what occurs when whitelight passes through a prism White light suchas sunlight is made up of light waves withrange of wavelengths from red to blue The tri-angular prism refracts the light twicemdashoncewhen it enters the prism and again when itleaves the prism and reenters the air Becausethe longer wavelengths of light are slowed lessthan the shorter wavelengths are red light isbent the least As a result of these differentamounts of bending the different colors areseparated when they emerge from the prism

Figure 11 The spoon looks

broken because light waves are

refracted as they change speed

when they pass from the water to

the air

329

Figure 12 Refraction causes a

prism to separate a beam of white

light into different colors

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330 CHAPTER 11 Sound and Light

Self Check

1 Compare and contrast opaque transparent and

translucent materials Give one example of each

2 Discuss why you can see your reflection in a smooth

piece of aluminum foil but not in a crumpled ball of foil

3 Infer what happens to light waves that are reflected off

dust particles in the air

4 Explain what happens to white light when it passes

through a prism

5 Think Critically Suppose a material has the same index

of refraction as water How would a light wave change

direction as it traveled from water into this material

Summary

Light and Matter

bull The amount of light that is absorbed

reflected or transmitted depends on the

material making up the object

Reflection of Light

bull Light waves always obey the law of reflection

the angle of incidence equals the angle of

reflection

bull Regular reflection causes parallel light waves

to be reflected in only one direction

bull Diffuse reflection causes parallel light waves

to be reflected in many directions

bull Scattering occurs when light waves are reflected

and travel in many different directions

Refraction of Light

bull Refraction occurs when a light wave changes

speed in moving from one material to another

bull The index of refraction of a material indicates

how much light slows down in the material

6 Find an Angle A light wave strikes a mirror at an

angle of 42deg from the surface of the mirror What

angle does the reflected wave make with the normal

7 Find an Angle A light wave reflects from a mirror at

27deg from the normal What was the angle between

the mirror and the incident wave

Mirages When yoursquore traveling in a car you might see whatlooks like a pool of water on the road ahead As you get closerthe water seems to disappear Yoursquove seen a miragemdashan image ofa distant object produced by the refraction of light through airlayers of different densities Mirages result when the air atground level is much warmer or cooler than the air above asshown in Figure 13 The density of air increases as air cools andlight waves move slower in cooler air than in warmer air As aresult light waves are refracted as they pass through air layerswith different temperatures

Figure 13 Mirages result when

air near the ground is much

warmer or cooler than the air

above This causes light waves

reflected from an object to refract

creating one or more additional

images

MirageWarm air

Cool air

More Section Review gpesciencecom

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SECTION 3 Mirrors Lenses and the Eye 331

Light RaysLight sources send out light waves in all directions These

waves spread out like ripples on the surface of water spread outfrom the point of impact of a pebble You can think of the lightcoming from the source as being many narrow beams of light trav-eling in all directions Each narrow light beam is called a light ray

MirrorsA mirror is any surface that produces a regular reflection A pool

of still water a metal pan and even the back of a shiny spoon can bemirrors Mirrors can be flat curved inward or curved outward

Plane Mirrors A flat smooth mirror is a plane mirror Whenyou look in a plane mirror your image appears upright If youstand 1 m from the mirror your image appears 1 m behind themirror or 2 m from you In fact your image is what a friend stand-ing 2 m from you would see Figure 14 shows how your image isformed First light rays from a light source strike you Every pointthat is struck by the light rays reflects these rays so they travel out-ward in all directions If your friend were looking at you thesereflected light rays coming from you would enter her eyes so shecould see you However if a mirror is placed between you and yourfriend light rays are reflected from the mirror back to your eyes

Mirrors Lenses andthe Eye

Reading Guide

Describe how images are formed

by three types of mirrors Explain how convex and concave

lenses form images Explain how the human eye

enables you to see Describe how lenses are used to

correct vision problems

Mirrors and lenses are used in optical

instruments such as cameras and

telescopes

Review Vocabulary

reflection the process of changing

direction after striking a surface

New Vocabulary

bull plane mirror

bull concave mirror

bull convex mirror

bull convex lens

bull concave lens

Figure 14 Seeing an image of

yourself in a mirror involves two

sets of reflections light rays are

reflected from you and then are

reflected by the mirror

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332 CHAPTER 11 Sound and Light

Virtual and Real Images The forma-tion of an image by a plane mirror isshown in Figure 15 Your brain assumesthat light rays travel in a straight line As aresult rays that enter your eyes seem tocome from behind the mirror This makesthe image seem to be behind the mirrorHowever no light rays actually passthrough the place where the image seemsto be located This type of image is called avirtual image Plane mirrors always formvirtual images If light rays from an objectpass through the location of the image theimage is called a real image Curved mir-rors can form both real and virtual images

Concave Mirrors If the surface of a mirror is curved inwardit is called a concave mirror as shown in Figure 16 The opticalaxis is an imaginary straight line drawn perpendicular to thesurface of the mirror at its center Every light ray traveling par-allel to the optical axis is reflected through a point on the opti-cal axis called the focal point The distance from the center ofthe mirror to the focal point is called the focal length

The image formed by a concave mirror depends on the loca-tion of the object relative to the focal point Figure 16 shows acandle located more than twice the focal length from the mirrorAlthough many light rays come from each point on the candleonly two rays from the same point are shown Ray A passesthrough the focal point and then reflects off the mirror movingparallel to the optical axis Ray B travels parallel to the opticalaxis before reflecting off the mirror and passing through thefocal point The point where the two rays meet is the location ofthe image of the original point on the candle The image formedis a real image because light rays from the candle pass throughthe place where the image is located

Figure 16 Rays A and B start from the same

place on the candle travel in different directions

and meet again on the reflected image

Diagram how two other points on the image ofthe candle are formed

Figure 15 Your brain interprets

the light rays reflected by the

mirror as coming from a point

behind the mirror

Infer how the size of your imagein a plane mirror depends on yourdistance from the mirror

Focalpoint

Optical axis

Ray B

Ray A

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SECTION 3 Mirrors Lenses and the Eye 333

Images Produced by a ConcaveMirror When an object is between oneand two focal lengths from a concavemirror the image is real inverted andlarger than the object An object closerthan one focal length from a concavemirror produces a virtual image that isupright and larger than the object Noimage is produced if the object islocated at the focal point

Convex Mirrors When you are in astore look up toward one of the backcorners or at the end of an aisle to see ifa large rounded mirror is mountedthere You can see a large area of the store in such a mirror Amirror that curves outward like the back of a spoon is called aconvex mirror Light rays that hit a convex mirror diverge orspread apart after they are reflected Figure 17 shows how therays from an object are reflected by a convex mirror to form animage The reflected rays diverge and never meet so a convexmirror forms only a virtual image The image also is upright andsmaller than the actual object is

Describe the image formed by a convex mirror

LensesWhat do your eyes have in common with cameras eyeglasses

and microscopes Each of these contains at least one lens A lens is atransparent object with at least one curved surface that causes lightrays to refract The image that a lens forms depends on the shape ofthe lens Like curved mirrors lenses can be convex or concave

Convex Lenses A convex lens is thicker in the middle than atthe edges Its optical axis is an imaginary straight line that is per-pendicular to the surface of the lens at its thickest point When lightrays approach a convex lens traveling parallel to its opticalaxis the rays are refracted toward the center of the lens asin Figure 18 Light rays traveling along the optical axis arenot bent at all All light rays traveling parallel to the opti-cal axis are refracted so they pass through a single pointwhich is the focal point of the lens The less curved thesides of the lens the less light rays are bent As a resultlenses with flatter sides have longer focal lengths Figure 19

on the next page shows that convex lenses can form eitherreal or virtual images

Figure 18 Convex lenses are

thicker in the middle than at the

edges Light rays that are parallel

to the optical axis are refracted so

that they pass through the focal

point A light ray that passes

through the center of the lens is

not refracted

Figure 17 A convex mirror

forms a reduced upright virtual

image

Optical axis

Ray A

Ray B

Focallength

Focalpoint

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Figure 19

VISUALIZING IMAGES FORMED BY A CONVEX LENS

334 CHAPTER 11 Sound and Light

Aconvex lens can form images that are real or virtual enlarged or reduced and upright orinverted Just as for a concave mirror the type of image formed by a convex lens depends on thelocation of the object relative to the focal point of the lens

Optical axis

One

focal

length

Two

focal

lengthsRay B

Image

Ray A

Object

Focal

point

Optical axis

One

focal

length

Two

focal

lengths

Ray B

Ray AObject

Image

Focal

point

Optical axis

Ray B

ObjectRay A

One

focal

length

Focal

pointImage

If the object is more than two focal lengths from the lens the image formed is real inverted andsmaller than the object As the object moves farther from the lens the image becomes smaller

If the object is between one and two focal lengths from the lens the image formed is real invertedand larger than the object As the object moves closer to the focal point the image becomes larger

If the object is less than one focal length from the lens the image is virtual upright and larger thanthe object The image is virtual because the light rays from the object diverge after they pass throughthe lens The image becomes smaller as the object moves closer to the lens

SECTION 3 Mirrors Lenses and the Eye 335

Concave Lenses A concave lens is thinnerin the middle and thicker at the edges Asshown in Figure 20 light rays that passthrough a concave lens bend away from theoptical axis The rays spread out and nevermeet so a real image is never formed Theimage is always virtual upright and smallerthan the object is Concave lenses are used insome types of eyeglasses and some telescopesConcave lenses usually are used in combinationwith other lenses

What type of image is formed by a concave lens

The Human EyeWhat determines how well you can see the words on this

page If you donrsquot need eyeglasses the structure of your eye givesyou the ability to focus on these words and other objects aroundyou Look at Figure 21 Light enters your eye through a trans-parent covering on your eyeball called the cornea The corneacauses light rays to bend so that they converge The light thenpasses through an opening called the pupil Behind the pupil isa flexible convex lens Muscles attached to the lens change itsshape to help focus light forming a sharp image on your retina

The retina is the inner lining of your eye The retina con-tains light-sensitive cells that convert an image into electricalsignals These signals then are carried along the optic nerve toyour brain to be interpreted With this complex structurethe human eye is capable of seeing clearly in bright and dimconditions focusing on both near and far objects and alsodetecting colors

Figure 20 A concave lens

refracts light rays so they spread

out away from the optical axis

Classify Is a concave lens mostlike a concave mirror or a convexmirror

Optical axis

Retina

Focalpoint

Pupil

Cornea

Lens

Optic nerve

Figure 21 The cornea and lens in your eye

bend light rays so that a sharp image is

formed on the retina

Eye Doctors Optometristsand ophthalmologists treatmany different eye prob-lems They often useadvanced technology todiagnose and correct mal-functioning parts of theeye Research an eye prob-lem and how it is treatedWrite a paragraph describ-ing what parts of the eyeare affected by the problemand how doctors correct it

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336 CHAPTER 11 Sound and Light

Brightness and Intensity The human eye can adjust to thebrightness of the light that strikes it If you step outside on asunny day you may have to shade your eyes against the intensityof the sunlight Light intensity is the amount of light energy thatstrikes a certain area each second Brightness is the human per-ception of light intensity Sunlight seems bright because a largeamount of light energy strikes your retina each second Youreyes respond to bright light by decreasing the size of your pupilThis reduces the amount of light that enters your eye and strikesthe retina

Intensity depends on your distance from a light source Ifyou move away from a bare lightbulb you can see how theintensity of the light rapidly decreases Because light rays spreadout from the source less light energy strikes your retina thefarther away you are from the bulb

Correcting Vision ProblemsIf you have good vision you should be able to see objects

clearly when they are 25 cm or farther away from your eyes Asharp image of an object should be formed on your retinaHowever for many people the image is blurry or formed in thewrong place causing vision problems

Farsightedness If you can see distant objects clearly butcanrsquot bring nearby objects into focus then you are farsighted Inthis case the eyeball might be too short or the lens isnrsquot curvedenough to form a sharp image of nearby objects on the retinaas shown in Figure 22 To correct the problem convex lensescan be used to bend incoming light rays so they converge beforethey enter the eye

Experimenting withFocal LengthsProcedure1 Complete the safety form

2 Fill a glass test tube with

water and seal it with a

lid or stopper3 Type or print SULFUR

DIOXIDE in capital letters

on a piece of paper4 Set the test tube horizon-

tally over the words

Record your observations

5 Hold the tube at several

heights above the words

Record your observations

Analysis1 Describe how the words

changed as the height of

the test tube increased

2 Classify the image at each

height as real or virtual

Focal

point

Correctedfarsighted eye

Light fromnearby object

Focalpoint

Light fromnearby object

Farsighted eye

The focal length of a farsighted eye is too long to form

a sharp image of nearby objects on the retina

A convex lens in front of a farsighted eye enables a sharp

image of nearby objects to be formed on the retina

Figure 22 Farsightedness can

be corrected by convex lenses

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SECTION 3 Mirrors Lenses and the Eye 337

Self Check

1 Diagram how light rays from an object are reflected by

a convex mirror to form an image

2 Infer how the size of the image changes if an object

that is less than one focal length from a concave mirror

moves closer to the mirror

3 Explain how the focal length of a convex lens changes

as the sides of the lens become less curved

4 Compare the image of an object less than one focal

length from a convex lens with the image of an object

more than two focal lengths from the lens

5 Think Critically Describe the image formed by a light

source placed at the focal point of a convex lens

Summary

Mirrors

bull A plane mirror forms upright virtual images

bull The image formed by a concave mirror

depends on the location of the object relative

to the focal point

bull Convex mirrors always produce virtual upright

images that are smaller than the object

Lenses

bull The image formed by a convex lens depends

on the distance of the object from the lens

bull Concave lenses always form virtual upright

images that are smaller than the object

The Eye and Vision

bull The eye contains a lens that changes shape to

produce sharp images on the retina

bull Farsightedness occurs when the eye cannot

form a sharp image of nearby objects

Nearsightedness occurs when the eye cannot

form sharp images of distant objects

6 Calculate Object Distance If you looked through a

convex lens with a focal length of 15 cm and saw a

real inverted enlarged image what is the maximum

distance between the lens and the object

Nearsightedness If you have nearsighted friends you knowthat they can see only nearby objects clearly Their eyes cannotform a sharp image on the retina of an object that is far awayInstead the image is formed in front of the retina as shown inFigure 23 To correct this problem a nearsighted person canwear concave lenses Figure 23 shows how a concave lens causesincoming light rays from distant objects to diverge before theyreach the eye Then the rays can be focused by the eye to form asharp image on the retina

Figure 23 Nearsightedness can

be corrected with concave lenses

Focalpoint

Light fromdistant object

Nearsighted eye

Focalpoint

Light fromdistant object

Correctednearsighted eye

When a nearsighted person looks at distant objects a

sharp image is formed in front of the retina

A concave lens in front of a nearsighted eye makes light

rays diverge so a sharp image is formed on the retina

More Section Review gpesciencecom

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How can you see the back of your head You

can use two mirrors to view a reflection of a

reflection of the back of your head

Real-World ProblemHow many images are seen in two mirrors

Goal Infer how the number of images depends

on the angle between two mirrors

Materialsplane mirrors (2) protractor

masking tape paper clip

Safety Precautions

Handle glass mirrors and paper clips carefully

Procedure1 Complete the safety form

2 Lay one mirror on top of the other with the

mirror surfaces together Tape together one

side so they can open and close Use tape to

label them L and R for left and right

3 Open the mirrors and stand them on a sheet

of paper at an angle of 72deg

4 Bend one leg of a paper clip up 90deg and

place it close to the front of the R mirror

5 Count the number of images of the paper

clip you see in the R and L mirrors Record

these numbers in your data table

6 The mirrors create an image of a circle

divided into wedges Record the number

of wedges

7 Hold the R mirror still and slowly move the Lmirror to 90deg Record the numbers of images

of the clip and wedges in the circle Repeat

this time opening the mirrors to 120deg

Conclude and Apply1 Infer the relationship between the number

of wedges and paper clip images

2 Determine the angle that would divide a

circle into six wedges Hypothesize how

many images would be produced Test your

hypothesis

Reflections of Reflections

Demonstrate for younger students the

relationship between the angle of the

mirrors and the number of reflections

338 CHAPTER 11 Sound and Light

Angle

Number of Number

of Mirrors Paper Clip Images

of Wedges R L

72ordm

90ordm

120ordm

Images and Wedges Seen in the Mirrors

Do not write in this book

SECTION 4 Light and Color 339

Why Objects Have ColorWhy do some apples appear red while others look green or

yellow An objectrsquos color depends on the wavelengths of light itreflects Recall that white light is a blend of all colors of visiblelight When a red apple is struck by white light it reflects redlight back to your eyes and absorbs all of the other colorsFigure 24 shows white light striking a green leaf Only the wave-lengths corresponding to green light are reflected to your eyes

Although some objects appear to be black black isnrsquot acolor Black is the absence of visible light Objects that appearblack absorb all colors of light and reflect little or no light backto your eyes White objects appear to be white because theyreflect all colors of visible light

Why does a white object appear white

Colored Filters Wearing tinted glasses changesthe color of almost everything you see If the lensesare yellow the world takes on a golden glow If theyare rose colored everything looks rosy Somethingsimilar would occur if you placed a colored clearplastic sheet over this white page The paper wouldappear to be the same color as the plastic The plasticsheet and the tinted lenses are filters A filter is atransparent material that transmits one or more col-ors of light but absorbs all others The color of a fil-ter is the color of the light that it transmits

Light and Color

Reading Guide

Explain how you see color Describe the difference between

light color and pigment color Predict what happens when dif-

ferent colors are mixed

From traffic lights to great works of

art color is an important part of your

world

Review Vocabulary

retina inner layer of the eye con-

taining cells that convert light

images into electrical signals

New Vocabulary

bull pigment

Figure 24 This leaf absorbs all

wavelengths of visible light except

the wavelengths you see as green

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340 CHAPTER 11 Sound and Light

Looking Through Colored Filters Figure 25 shows howthe color of an object can change when you look at it throughvarious colored filters The cooler looks blue under white lightbecause it reflects only the wavelengths of blue light that strikeit If you look at the cooler through a blue filter the cooler stilllooks blue because the blue filter transmits the reflected bluelight However if you look at the cooler through a red filter thecooler seems black because the red filter blocks the blue lightreflected by the cooler

Why does a blue object appear black whenviewed through a red filter

Seeing ColorAs you approach a busy intersection the color of the traffic

light changes from green to yellow to red On the cross street thecolor changes from red to green At a busy intersection trafficsafety depends on your ability to detect color changes rapidlyHow do you see colors

Light and the Eye In a healthy eye light enters the eyethrough the cornea is focused by the lens and finally forms animage on the retina The retina is made up of two types of cellsthat absorb light as shown in Figure 26 When these cellsabsorb light energy chemical reactions convert light energy intonerve impulses that are transmitted to the brain One type ofcell in the retina called a cone enables you to distinguish colorsand detailed shapes of objects Cones need bright light to gener-ate nerve impulses so they do not operate in dim light As aresult even brightly colored objects might look gray or black indim light

Figure 25 The color of this

cooler changes when viewed

through different color filters

Topic Color BlindnessVisit for Web

links to information about the

causes of color blindness

Activity Research the causes

and types of color blindness Find

out how cones are related to the

ability to distinguish colors

gpesciencecom

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SECTION 4 Light and Color 341

Cones and Rods Your eyes have three types of cones each ofwhich responds to a different range of wavelengths Red conesrespond to mostly red and yellow light Green cones respond tomostly yellow and green light Blue cones respond to mostlyblue and violet light The second type of cell in the retina calleda rod is sensitive to dim light and enables you to see at nightHowever rod cells do not enable you to see colors

Interpreting Color Why does a bananalook yellow The light reflected by the

banana causes the cone cells that are sensitive to red and greenlight to send signals to your brain Your brain could get the samesignal if a mixture of red light and green light reached your eyesThis mixture also would cause your red and green cones torespond and you would see the color yellow As a result lightwith wavelengths corresponding to yellow light and light that isa mixture of red and green light both cause the color yellow tobe seen What happens when you look at a white shirt You seewhite when all wavelengths of visible light enters your eyes Thenall three sets of cones cells send signals to the brain The com-bination of these signals cause you to see the shirt as white

Color Blindness If one or more of your sets of cone cellsdo not function properly you might not be able to distinguishcertain colors This condition is called color blindness orcolor deficiency About eight percent of men and one-halfpercent of women have some form of color blindness Themost common form of color blindness makes it difficult todistinguish between red and green Figure 27 shows an imagethat is used in a test for redndashgreen color blindness Becausered and green are used in traffic signals drivers and pedestri-ans must be able to identify them

Retina

Rod

Cone

Lens

Figure 27 Color blindness is an

inherited sex-linked condition in

which certain sets of cones in the

retina do not function properly

Identify the number that you seein the dots

Figure 26 Light enters the eye

and focuses on the retina The two

types of light-detecting cells

that make up the retina

are called rods and cones

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342 CHAPTER 11 Sound and Light

Mixing ColorsIf you have ever browsed through a paint store you have

probably seen displays where customers can select paint samplesof almost every imaginable color The colors are a result of mix-tures of pigments For example you might have mixed blue andyellow paint to produce green paint A pigment is a coloredmaterial that is used to change the color of other substancesThe color of a pigment results from the different wavelengths oflight that the pigment reflects

Mixing Colored Lights From the glowing orange of a sun-set to the deep blue of a mountain lake all the colors you see canbe made by mixing three colors of light These three colorsmdashred green and bluemdashare the primary colors of light They cor-respond to the three different types of cones in the retina ofyour eye When mixed together in equal amounts they producewhite light as Figure 28 shows Mixing the primary colors indifferent proportions can produce the colors you see

What are the primary colors of light

Paint Pigments If you were to mix equal amounts of redgreen and blue paint would you get white paint If mixing col-ors of paint were like mixing colors of light you would but mix-ing paint is different Paints are made with pigments Pigmentsproduce color as a result of the wavelengths of light they reflectPaint pigments usually are made of chemical compounds suchas titanium oxide a bright white pigment and lead chromatewhich is used for painting yellow lines on highways

Figure 28 White light is pro-

duced when the three primary col-

ors of light are mixed in equal

amounts

Color for PhotosynthesisPlant pigments determinethe wavelengths oflight for photosynthesisLeaves usually look greenbecause of the pigmentchlorophyll Chlorophyllabsorbs most wave-lengths of visible lightexcept green which itreflects However not allplants are green Researchdifferent plant pigmentsto find out how they allowplant species to survive indiverse habitats

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SECTION 4 Light and Color 343

Self Check

1 Identity what colors are reflected and what colors are

absorbed if a white light shines on a red shirt

2 Discuss how the primary colors of light differ from the

primary pigment colors

3 Explain why a red apple would appear black if you

looked at it through a blue filter

4 Determine why a white fence appears to be white instead

of multicolored if all colors are present in white light

5 Think Critically Light reflected from an object passes

through a green filter then a red filter and finally a

blue filter What color will the object seem to be

Summary

Why Objects Have Color

bull The color of an object is determined by the

wavelengths of light it reflects

bull The color of a filter is the color of the light the

filter transmits

Seeing Color

bull Rod and cone cells are light-sensitive cells

found in the retina of the human eye

bull Rod cells are sensitive to dim light Cone cells

enable colors to be seen

bull There are three types of cone cells One type

responds to red light another to green light

and another to blue light

Mixing Colors

bull Red green and blue are the primary light

colors Any color of light can be created by

mixing these primary light colors

bull Any pigment color can be formed by mixing

the primary pigment colorsmdashmagenta cyan

and yellow

6 Use Percentages In the human eye there are about

120000000 rods If 90000000 rods trigger at once

what percentage of the total number of rods triggered

7 Convert Units The wavelengths of light are measured

in nanometers (nm) which equals 0000001 mm

Find the wavelength in mm of a light wave that has a

wavelength of 690 nm

Mixing Pigments You can make any pigment color by mixingdifferent amounts of the three primary pigmentsmdashmagenta(bluish red) cyan (greenish blue) and yellow In fact color print-ers use these pigments as well as black ink to make full-colorprints like the pages in this book A primary pigmentrsquos colordepends on the wavelengths of the light that it reflects Actuallypigments both absorb and reflect a range of colors in sending asingle color message to your eye For example in white lightyellow pigment appears yellow because it reflects red and greenlight but absorbs the other wavelengths of visible light The colorof a mixture of two primary pigments is determined by theprimary colors of light that both pigments reflect

Look at Figure 29 The area in the center where the colors alloverlap appears to be black because the three blended primarypigments absorb all the primary colors of light Recall that theprimary colors of light combine to produce white light They arecalled additive colors However when the primary pigment col-ors are combined they absorb all wavelengths of visible light andproduce black Because black results from the absence ofreflected light the primary pigments are called subtractive colors

Figure 29 The three primary

pigment colors appear to be black

when they are mixed

Describe how the primary pigmentcolors are similar to the primary col-ors of light

More Section Review gpesciencecom

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Design Your OwnDesign Your Own

344

Real-World ProblemWhat loud noises do you enjoy and which ones do you find annoying

Most people enjoy a music concert performed by their favorite artist or

the booming displays of fireworks on the Fourth of July Most people

enjoy these loud sounds for short periods of time However certain

other loud noises such as traffic sirens and loud talking can be

annoying Constant annoying noises are called noise pollution What

can be done to reduce noise pollution What types of barriers will best

block out noise pollution

Form a HypothesisBased on your experiences with loud noises form a hypothesis that

predicts the effectiveness of different types of barriers at blocking out

noise pollution

Test Your HypothesisMake a Plan

1 Complete the safety form

2 Decide what type of barriers or materials you will test

3 Describe exactly how you will use these materials

Goals Design an experiment

that tests the effective-

ness of various types of

barriers and materials

for blocking out noise

pollution

Test different types of

materials and barriers

to determine the best

noise blocks

Possible Materialsradio CD player horn

drum or other loud

noise source

shrubs trees concrete

walls brick walls stone

walls wooden fences

parked cars or hanging

laundry

sound meter

meterstick or metric tape

measure

Blocking NfisePollution

4 Identify the controls and variables you will use in your

experiment

5 List the steps you will use and describe each step precisely

6 Prepare a data table in your Science Journal to record your

measurements

7 Organize the steps of your experiment in logical order

Follow Your Plan

1 Ask your teacher to approve your plan and data table before

you start

2 Conduct your experiment as planned

3 Test each barrier two or three times

4 Record the results from each test in your data table in your Science Journal

Analyze Your Data1 Identify the barriers that most effectively reduced noise pollution

2 Identify the barriers that least effectively reduced noise pollution

3 Compare the effective barriers and identify common characteristics that might

explain why they reduced noise pollution

4 Compare the natural barriers you tested with the artificial barriers Which type

of barrier best reduced noise pollution

5 Compare the different types of materials the barriers were made of Which

type of material best reduced noise pollution

Conclude and Apply1 Evaluate whether your results support your hypothesis

2 Predict how your results would differ if you used a louder source of noise such

as a siren

3 Infer from your results how people living near a

busy street could reduce noise pollution

4 Identify major sources of noise pollution in or

near your home How could they be reduced

5 Research how noise pollution can be

unhealthy

LAB 345

Draw a poster illustrating how builders and

landscapers could use certain materials to

better insulate a home or office from excess

noise pollution

346 CHAPTER 11 Sound and Light

A Haiku GardenThe Four Seasons in Poems and Prints

by Stephen Addiss with Fumiko and Akira Yamamoto

Respond to the Reading1 How do the illustrations help the reader

better understand the poems2 What do you think is meant by the

word lingering in the Haiku about springsunlight

3 Linking Science and Writing Writeone haiku about summer and anotherabout fall In one poem use color tohelp you describe the season In theother use light or some property oflight to help describe the season

Research has deter-mined that there is a

connection between color and mood Warmcolors have longer wavelengths and can bemore stimulating Cool colors which haveshorter wavelengths tend to have a calmingor soothing effect on people Light and colorhave long been used as literary symbols Doesthe use of color change what you imaginewhen you read the haiku

UnderstandingLiteratureJapanese Haiku A haiku is a verse thatconsists of three lines and 17 syllables inthe Japanese language The first and thirdlines have five syllables each and themiddle line has seven syllables Why isimagination important in reading haiku

Lingering

in every pool of watermdash

spring sunlightIssa

Withered by winter

the sound of the windmdash

one-color worldBasho

Sound

1 Sound waves are compressional waves thattravel only in matter

2 The speed of sound in a material dependson the type of material as well as itstemperature

3 Loudness depends on a sound waversquos inten-sity Pitch depends on a sound waversquosfrequency

4 Sound waves are used in echolocationsonar and medical imaging

Reflection and Refractionof Light

1 Light can be absorbed reflected or trans-mitted by a material

2 When light waves are reflected theyobey the law of reflectionmdashthe angle ofincidence equals the angle of reflection

3 A light wave is refracted or bent whenit changes speed as it travels at an anglefrom one material to another

Mirrors Lenses andthe Eye

1 Plane mirrors form upright virtual images

2 Images formed by concave mirrors andconvex lenses depend on the location ofthe object relative to the focal point

3 Convex mirrors and concave lenses formvirtual upright images that are smallerthan the object

4 The lens in the human eye changes shape toproduce a sharp image on the retina

Light and Color

1 You see color when light is reflected offobjects and into your eyes

2 Cone cells in the retina are light-sensitivecells that enable you to distinguish colors

3 Red blue and green are the three primarycolors of light and can be mixed to form allother colors

4 The primary pigment colors are magentacyan and yellow

CHAPTER STUDY GUIDE 347

Use the Foldable you made at the beginningof the chapter to help you review sound and light

Interactive Tutor gpesciencecom

Complete each statement with the correctvocabulary word or phrase

1 A change in frequency due to a movingsound source is due to the

2 A flat smooth surface that reflects light andforms an image is a(n)

3 An object is if you can seethrough it clearly

4 The of a material indicates howmuch the speed of light in the materialchanges as light passes through

5 You can change the color of white paint byadding a(n) to it

6 A(n) is a reflecting surface thatcurves outward like the back of a spoon

7 The human perception of the intensity of asound wave is

Choose the word or phrase that best answerseach question

8 Which of the following best describes imageformation by a plane mirrorA) A real image is formed in front of the mirrorB) A real image is formed behind the mirrorC) A virtual image is formed in front of the

mirrorD) A virtual image is formed behind the mirror

9 For a sound with low pitch what else isalso always lowA) amplitude C) wavelengthB) frequency D) wave velocity

10 Which of the following occurs when asound source moves away from youA) The soundrsquos velocity decreasesB) The soundrsquos loudness increasesC) The soundrsquos frequency decreasesD) The soundrsquos frequency increases

Use the table below to answer question 11

11 Based on the data in the table abovewhich of the following would be the speedof sound in air at 30degCA) 3404 ms C) 3494 msB) 3464 ms D) 3534 ms

12 What happens to a light ray travelingparallel to the optical axis of a convexlens that passes through the lensA) It travels parallel to the optical axisB) It passes through the focal pointC) It is bent away from the optical axisD) It forms a virtual image

13 Light waves of which color are bent mostwhen passing through a prismA) blue C) violetB) red D) yellow

14 Which way does a concave lens bend lightA) toward its optical axisB) toward its centerC) toward its edgesD) toward its focal point

Speed of Sound in Air

Temp peed( s)

4

4

4

348 CHAPTER REVIEW

concave lens p 335concave mirror p 332convex lens p 333convex mirror p 333decibel p 322Doppler effect p 323index of refraction p 329intensity p 322

loudness p 322opaque p 327pigment p 342pitch p 323plane mirror p 331translucent p 327transparent p 327

Vocabulary PuzzleMaker gpesciencecom

Use the illustration below to answer question 15

15 Describe how the position of the candlechanged if the image of the candle movedaway from the focal point

16 Apply Acoustic scientists sometimes doresearch in rooms that absorb all soundwaves How could such a room be used tostudy how bats find their food

17 Compare White light passes through atranslucent pane of glass and shines on ashirt Both the translucent glass and theshirt appear green Compare the colors oflight that are absorbed and transmitted bythe glass and the shirt

18 Infer Most mammals including dogs andcats canrsquot see colors Infer how the retinaof a catrsquos eye might be different from theretina of a human eye

19 Determine whether a convex lens could forman image that is enlarged real and upright

20 Infer A car comes to a railroad crossingThe driver hears a trainrsquos whistle and itspitch becomes lower What can beassumed about how the train is moving

21 Compare and contrast the reflection of lightfrom a white wall with a rough surfacewith the reflection of light from a mirror

Optical axis

One

focal

length

Two

focal

lengths

Image

Ray A

Object

Focal

point

Interpreting Graphics 22 Infer why a convex mirror and a concavelens can never produce a real image

23 Predict what color a white shirt wouldappear to be if the light reflected from theshirt passed through a red filter and thenthrough a green filter

24 Explain why windows might begin to rattlewhen an airplane flies overhead

25 Communicate Some people enjoy usingsnowmobiles Others object to the noisethat they make Write a proposal for a pol-icy that seems fair to both groups for theuse of snowmobiles in a state park

CHAPTER REVIEW 349

Use the wave speed equation ν ƒλ to answer

questions 26 and 27

26 Calculate Frequency A sonar pulse has awavelength of 30 cm and a speed inwater of 1500 ms Find its frequency

27 Calculate Wavelength What is the wave-length of a sound wave with a fre-quency of 440 Hz if the speed of soundin air is 340 ms

28 Calculate Angle of Incidence A light ray isreflected from a mirror If the anglebetween the incident ray and thereflected ray is 136deg what is the angleof incidence

29 Determine Object Distance You hold anobject in front of a concave mirror witha focal length of 30 cm If you do notsee a reflected image how far from themirror is the object

30 Calculate Speed The speed of light in avacuum is 300000 kms If the index ofrefraction of water is 133 what is thespeed of light in water

More Chapter Review gpesciencecom

1 Which of the following describes the imageformed by a convex mirror

A enlarged

B inverted

C real

D virtual

Use the figure below to answer question 2

2 Which of the following describes a light raythat passes through the focal point andthen is reflected by the mirror

A It travels parallel to the optical axis

B It forms a real image

C It is reflected back through the focal point

D It forms a virtual image

3 Why does an apple look red

A It reflects red light

B It absorbs red light

C It reflects green and blue light

D It reflects all colors of light except red

Use the figure below to answer questions 4 and 5

4 When the primary colors of light are addedtogether what color appears in area H

A cyan

B magenta

C white

D yellow

5 When the primary colors of light are addedtogether what color appears in area G

A cyan

B magenta

C white

D yellow

6 Which of the following increases as the fre-quency of a sound increases

A amplitude

B intensity

C loudness

D pitch

Red Blue

Green

F

H

G K

Focal pointOptical axis

350 STANDARDIZED TEST PRACTICE

Record your answers on the answer sheet provided by your teacher or on a sheet of paper

STANDARDIZED TEST PRACTICE 351

7 Which of the following parts of the eyeenable you to see colors in bright light

A cone cells

B cornea

C lens

D rod cells

Use the graph below to answer questions 8 and 9

8 Determine how far in centimeters theimage is from the lens when the object is15 centimeters from the lens

9 How far in centimeters is the object fromthe lens when the image distance andobject distance are equal

10 A shirt has stripes that are black and whitein white light If green light shines on thisshirt what colors will the black and whitestripes be

11 If you are on a moving train what hap-pens to the pitch of a crossing bell as youapproach the crossing and then moveaway from the crossing

Use the figure below to answer question 12

12 Describe the vision problem show by thefigure and explain how this vision prob-lem can be corrected

13 Explain why the human eye can see colorsbetter in bright light than in dim light

Image Distance fora Convex Lens

Ima

ge

dis

tan

ce (

cm)

30

25

20

15

10

5 10 15 20 25 30

Object distance (cm)

Standardized Test Practice gpesciencecom

Note Units Read carefully and make note of the units used in

any measurement

  • Glencoe Physical Science with Earth Science
    • Student Edition Table of Contents
      • Unit 1 Science and Technology
        • Chapter 1 The Nature of Science
          • Launch Lab Understanding Measurements
          • Foldables
          • Section 1 The Methods of Science
            • Science Online
            • Integrate History
            • Integrate Earth Science
            • Science Online
              • Section 2 Standards of Measurement
                • Applying Math Centimeters
                • Integrate Earth Science
                • Science Online
                • MiniLAB Determining the Density of a Pencil
                • Visualizing SI Dimensions
                  • Section 3 Communicating with Graphs
                    • Applying Math Temperature
                    • MiniLAB Graphing Temperature Change
                    • Lab Whats my graph
                    • Lab Design Your Own - Developing a Measurement System
                    • Science and Language Arts Thinking in Pictures and Other Reports from My Life with Autism
                      • Chapter 1 Study Guide
                      • Chapter 1 Review
                      • Chapter 1 Standardized Test Practice
                        • Chapter 2 Science Technology and Society
                          • Lab Technology in Your Life
                          • Foldables
                          • Section 1 Science and Technology
                            • MiniLAB Researching the Past
                            • Visualizing Technology Supplying Basic Needs
                            • Science Online
                              • Section 2 Forces that Shape Technology
                                • MiniLAB Evaluating the Benefits and Consequences of Technology
                                • Integrate Environment
                                • Integrate History
                                • Applying Science What impact does the accident at Chernobyl have on the future of nuclear power
                                • Science Online
                                • Lab Who contributes CO2
                                  • Section 3 Developing Technology
                                    • Integrate Life Science
                                    • Integrate Career
                                    • Lab Model and Invent - Care Package
                                    • Oops Accidents in Science A Slippery Situation
                                      • Chapter 2 Study Guide
                                      • Chapter 2 Review
                                      • Chapter 2 Standardized Test Practice
                                          • Unit 2 Motion Forces and Energy
                                            • Chapter 3 Motion Acceleration and Forces
                                              • Launch Lab Compare Speeds
                                              • Foldables
                                              • Section 1 Describing Motion
                                                • MiniLAB Measuring Average Speed
                                                • Science Online
                                                • Applying Math Average Speed
                                                • Integrate Astronomy
                                                • Science Online
                                                  • Section 2 Acceleration
                                                    • Integrate History
                                                    • Visualizing Acceleration
                                                      • Section 3 Motion and Forces
                                                        • Science Online
                                                        • MiniLAB Comparing Friction
                                                        • Lab Force and Acceleration
                                                        • Lab Design Your Own - Comparing Motion from Different Forces
                                                        • Science and Language Arts A Brave and Startling Truth
                                                          • Chapter 3 Study Guide
                                                          • Chapter 3 Review
                                                          • Chapter 3 Standardized Test Practice
                                                            • Chapter 4 The Laws of Motion
                                                              • Launch Lab The Force of Gravity
                                                              • Foldables
                                                              • Section 1 The First Two Laws of Motion
                                                                • MiniLAB Observing Inertia
                                                                • Science Online
                                                                • Applying Math The Acceleration of a Sled Solve a Simple Equation
                                                                  • Section 2 Gravity
                                                                    • Science Online
                                                                    • Integrate Earth Science
                                                                    • MiniLAB Observing Centripetal Force
                                                                    • Lab Gravity and Air Resistance
                                                                      • Section 3 The Third Law of Motion
                                                                        • Integrate Career
                                                                        • Visualizing Rocket Motion
                                                                        • Applying Math The Momentum of a Sprinter
                                                                        • Lab The Momentum of Colliding Objects
                                                                        • Science and History Newton and the Plague
                                                                          • Chapter 4 Study Guide
                                                                          • Chapter 4 Review
                                                                          • Chapter 4 Standardized Test Practice
                                                                            • Chapter 5 Energy
                                                                              • Launch Lab Energy Conversions
                                                                              • Foldables
                                                                              • Section 1 The Nature of Energy
                                                                                • Science Online
                                                                                • Applying Math Kinetic Energy
                                                                                • MiniLAB Interpreting Data from a Slingshot
                                                                                • Integrate Language Arts
                                                                                • Applying Math Gravitational Potential Energy
                                                                                • Lab Bouncing Balls
                                                                                  • Section 2 Conservation of Energy
                                                                                    • Visualizing Energy Transformations
                                                                                    • Integrate Environment
                                                                                    • MiniLAB Transforming Energy in a Paper Clip
                                                                                    • Science Online
                                                                                    • Integrate Health
                                                                                    • Lab Design Your Own - Swinging Energy
                                                                                    • Science and History The Impossible Dream
                                                                                      • Chapter 5 Study Guide
                                                                                      • Chapter 5 Review
                                                                                      • Chapter 5 Standardized Test Practice
                                                                                        • Chapter 6 Work and Machines
                                                                                          • Launch Lab Doing Work with a Simple Machine
                                                                                          • Foldables
                                                                                          • Section 1 Work
                                                                                            • Integrate Language Arts
                                                                                            • Applying Math Work
                                                                                            • MiniLAB Calculating Your Work and Power
                                                                                            • Applying Math Power
                                                                                              • Section 2 Using Machines
                                                                                                • MiniLAB Machines Multiplying Force
                                                                                                • Science Online
                                                                                                • Integrate Chemistry
                                                                                                  • Section 3 Simple Machines
                                                                                                    • Integrate History
                                                                                                    • Visualizing Levers in the Human Body
                                                                                                    • Science Online
                                                                                                    • Lab Levers
                                                                                                    • Lab Model and Invent - Using Simple Machines
                                                                                                    • Science and Society The Science of Very Very Small
                                                                                                      • Chapter 6 Study Guide
                                                                                                      • Chapter 6 Review
                                                                                                      • Chapter 6 Standardized Test Practice
                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                          • Launch Lab Relative Sizes of Earth the Moon and the Sun
                                                                                                          • Foldables
                                                                                                          • Section 1 Earth in Space
                                                                                                            • Science Online
                                                                                                            • Integrate Physics
                                                                                                              • Section 2 Time and Seasons
                                                                                                                • MiniLAB Modeling the Suns Rays at Solstice
                                                                                                                • Lab Comparing the Angle of Sunlight to Intensity
                                                                                                                  • Section 3 Earths Moon
                                                                                                                    • Applying Math Tides
                                                                                                                    • MiniLAB Modeling Phases and Eclipses
                                                                                                                    • Integrate History
                                                                                                                    • Integrate History
                                                                                                                    • Science Online
                                                                                                                    • Visualizing Water on the Moon
                                                                                                                    • Lab Identifying the Moons Surface Features and Apollo Landing Sites
                                                                                                                    • Oops Accidents in Science Even Great Scientists Make Mistakes
                                                                                                                      • Chapter 7 Study Guide
                                                                                                                      • Chapter 7 Review
                                                                                                                      • Chapter 7 Standardized Test Practice
                                                                                                                        • Chapter 8 The Solar System
                                                                                                                          • Launch Lab The Size of the Solar System
                                                                                                                          • Foldables
                                                                                                                          • Section 1 Planet Motion
                                                                                                                            • Integrate History
                                                                                                                            • MiniLAB Plotting Retrograde Motion
                                                                                                                            • Integrate Physics
                                                                                                                            • Applying Math Heliocentric Longitude (HL)
                                                                                                                              • Section 2 The Inner Planets
                                                                                                                                • Science Online
                                                                                                                                • Integrate Chemistry
                                                                                                                                • Lab Interpreting Features of Marss Surface
                                                                                                                                  • Section 3 The Outer Planets
                                                                                                                                    • Integrate Language Arts
                                                                                                                                    • Visualizing What Galileo Saw
                                                                                                                                    • Science Online
                                                                                                                                    • MiniLAB Comparing Sizes of Outer and Inner Planets
                                                                                                                                      • Section 4 Life in the Solar System
                                                                                                                                        • Lab Design Your Own - Testing Unknown Soil Samples for Life
                                                                                                                                        • Science Stats Night Sky Wonders
                                                                                                                                          • Chapter 8 Study Guide
                                                                                                                                          • Chapter 8 Review
                                                                                                                                          • Chapter 8 Standardized Test Practice
                                                                                                                                              • Unit 3 Energy in Motion
                                                                                                                                                • Chapter 9 Heat and States of Matter
                                                                                                                                                  • Launch Lab Expansion of a Gas
                                                                                                                                                  • Foldables
                                                                                                                                                  • Section 1 Temperature and Thermal Energy
                                                                                                                                                    • Applying Math Converting to Celsius
                                                                                                                                                    • Science Online
                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                    • Applying Math Change in Thermal Energy
                                                                                                                                                      • Section 2 States of Matter
                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                        • Science Online
                                                                                                                                                        • MiniLAB Comparing States of Water
                                                                                                                                                          • Section 3 Transferring Thermal Energy
                                                                                                                                                            • MiniLAB Comparing Thermal Conductors
                                                                                                                                                            • Visualizing Convection Currents
                                                                                                                                                            • Lab Convection in Gases and Liquids
                                                                                                                                                              • Section 4 Using Thermal Energy
                                                                                                                                                                • Integrate History
                                                                                                                                                                • Science Online
                                                                                                                                                                • Lab Conduction in Gases
                                                                                                                                                                • Science Stats Surprising Thermal Energy
                                                                                                                                                                  • Chapter 9 Study Guide
                                                                                                                                                                  • Chapter 9 Review
                                                                                                                                                                  • Chapter 9 Standardized Test Practice
                                                                                                                                                                    • Chapter 10 Waves
                                                                                                                                                                      • Launch Lab How do waves transfer energy
                                                                                                                                                                      • Foldables
                                                                                                                                                                      • Section 1 The Nature of Waves
                                                                                                                                                                        • Visualizing Formation of Ocean Waves
                                                                                                                                                                        • Science Online
                                                                                                                                                                          • Section 2 Wave Properties
                                                                                                                                                                            • MiniLAB Observing Wavelength
                                                                                                                                                                            • Integrate Social Studies
                                                                                                                                                                            • Applying Math The Speed of Sound
                                                                                                                                                                            • Lab Wave Speed and Tension
                                                                                                                                                                              • Section 3 The Behavior of Waves
                                                                                                                                                                                • Science Online
                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                • MiniLAB Experimenting with Resonance
                                                                                                                                                                                • Lab Measuring Wave Properties
                                                                                                                                                                                • Science and History Making Waves
                                                                                                                                                                                  • Chapter 10 Study Guide
                                                                                                                                                                                  • Chapter 10 Review
                                                                                                                                                                                  • Chapter 10 Standardized Test Practice
                                                                                                                                                                                    • Chapter 11 Sound and Light
                                                                                                                                                                                      • Launch Lab What sound does a ruler make
                                                                                                                                                                                      • Foldables
                                                                                                                                                                                      • Section 1 Sound
                                                                                                                                                                                        • MiniLAB Comparing Intensity
                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                        • Science Online
                                                                                                                                                                                        • Applying Math Using Sonar
                                                                                                                                                                                          • Section 2 Reflection and Refraction of Light
                                                                                                                                                                                          • Section 3 Mirrors Lenses and the Eye
                                                                                                                                                                                            • Visualizing Images Formed by a Convex Lens
                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                            • MiniLAB Experimenting with Focal Lengths
                                                                                                                                                                                            • Lab Reflections of Reflections
                                                                                                                                                                                              • Section 4 Light and Color
                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Lab Design Your Own - Blocking Noise Pollution
                                                                                                                                                                                                • Science and Language Arts A Haiku Garden The Four Seasons in Poems and Print
                                                                                                                                                                                                  • Chapter 11 Study Guide
                                                                                                                                                                                                  • Chapter 11 Review
                                                                                                                                                                                                  • Chapter 11 Standardized Test Practice
                                                                                                                                                                                                    • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                      • Launch Lab Global Jigsaw Puzzle
                                                                                                                                                                                                      • Foldables
                                                                                                                                                                                                      • Section 1 Evolution of Earths Crust
                                                                                                                                                                                                        • Applying Math Spreading Distances
                                                                                                                                                                                                        • Integrate Physics
                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                          • Section 2 Earthquakes
                                                                                                                                                                                                            • MiniLAB Demonstrating Four Types of Stress
                                                                                                                                                                                                            • Visualizing Earthquake-Proof Buildings
                                                                                                                                                                                                              • Section 3 Earths Interior
                                                                                                                                                                                                              • Section 4 Volcanoes
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • MiniLAB Modeling Lava Viscosity
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                • Lab A Case for Pacific Plate Motion
                                                                                                                                                                                                                • Lab Earthquake Earthquake Wheres the earthquake
                                                                                                                                                                                                                • Science and History Volcano Weather
                                                                                                                                                                                                                  • Chapter 12 Study Guide
                                                                                                                                                                                                                  • Chapter 12 Review
                                                                                                                                                                                                                  • Chapter 12 Standardized Test Practice
                                                                                                                                                                                                                      • Unit 4 Forms of Energy
                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                          • Launch Lab Electric Circuits
                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                          • Section 1 Electric Charge
                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                            • Visualizing Lightning
                                                                                                                                                                                                                            • MiniLAB Investigate Charged Objects
                                                                                                                                                                                                                              • Section 2 Electric Current
                                                                                                                                                                                                                                • MiniLAB Investigating Battery Addition
                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                • Lab Identifying Conductors and Insulators
                                                                                                                                                                                                                                  • Section 3 Electrical Energy
                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                    • Applying Math Power Used by a Clothes Dryer
                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                    • Applying Math Electrical Energy Used by a Microwave Oven
                                                                                                                                                                                                                                    • Lab Design Your Own - Comparing Series and Parallel Circuits
                                                                                                                                                                                                                                    • Science and Language Arts Invisible Man
                                                                                                                                                                                                                                      • Chapter 13 Study Guide
                                                                                                                                                                                                                                      • Chapter 13 Review
                                                                                                                                                                                                                                      • Chapter 13 Standardized Test Practice
                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                          • Launch Lab The Strength of Magnets
                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                          • Section 1 Magnetism
                                                                                                                                                                                                                                            • MiniLAB Observing Magnetic Interference
                                                                                                                                                                                                                                            • Integrate Earth Science
                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                            • Applying Science How can magnetic parts of a junk car be salvaged
                                                                                                                                                                                                                                            • MiniLAB Making Your Own Compass
                                                                                                                                                                                                                                              • Section 2 Electricity and Magnetism
                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                  • Section 3 Producing Electric Current
                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                    • Visualizing Motors and Generators
                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                    • Lab Electricity and Magnetism
                                                                                                                                                                                                                                                    • Lab Design Your Own - Controlling Electromagnets
                                                                                                                                                                                                                                                    • Science and History Body Art
                                                                                                                                                                                                                                                      • Chapter 14 Study Guide
                                                                                                                                                                                                                                                      • Chapter 14 Review
                                                                                                                                                                                                                                                      • Chapter 14 Standardized Test Practice
                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                          • Launch Lab Can electromagnetic waves change materials
                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                          • Section 1 What are electromagnetic waves
                                                                                                                                                                                                                                                            • MiniLAB Investigating Electromagnetic Waves
                                                                                                                                                                                                                                                            • Applying Math The Speed of Light in Water
                                                                                                                                                                                                                                                              • Section 2 The Electromagnetic Spectrum
                                                                                                                                                                                                                                                                • MiniLAB Heating with Microwaves
                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                • Lab The Shape of Satellite Dishes
                                                                                                                                                                                                                                                                  • Section 3 Radio Communication
                                                                                                                                                                                                                                                                    • Visualizing Radio Broadcasts
                                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Lab Use the Internet - Radio Frequencies
                                                                                                                                                                                                                                                                    • Science and History Riding a Beam of Light
                                                                                                                                                                                                                                                                      • Chapter 15 Study Guide
                                                                                                                                                                                                                                                                      • Chapter 15 Review
                                                                                                                                                                                                                                                                      • Chapter 15 Standardized Test Practice
                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                          • Launch Lab Heating with Solar Energy
                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                          • Section 1 Fossil Fuels
                                                                                                                                                                                                                                                                            • Visualizing The Formation of Fossil Fuels
                                                                                                                                                                                                                                                                            • MiniLAB Designing an Efficient Water Heater
                                                                                                                                                                                                                                                                              • Section 2 Nuclear Energy
                                                                                                                                                                                                                                                                                • Integrate Earth Science
                                                                                                                                                                                                                                                                                • Integrate Social Science
                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                • Applying Science Can a contaminated radioactive site be reclaimed
                                                                                                                                                                                                                                                                                  • Section 3 Renewable Energy Sources
                                                                                                                                                                                                                                                                                    • MiniLAB Using Solar Power at Home
                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                    • Lab Solar Heating
                                                                                                                                                                                                                                                                                    • Lab Use the Internet How much does energy really cost
                                                                                                                                                                                                                                                                                    • Science and Society Reacting to Nuclear Energy
                                                                                                                                                                                                                                                                                      • Chapter 16 Study Guide
                                                                                                                                                                                                                                                                                      • Chapter 16 Review
                                                                                                                                                                                                                                                                                      • Chapter 16 Standardized Test Practice
                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                          • Lab Atmospheric Pressure
                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                          • Section 1 Earths Atmosphere
                                                                                                                                                                                                                                                                                            • MiniLAB Visualizing Convection
                                                                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                                                                            • Lab Visualizing a Temperature Inversion
                                                                                                                                                                                                                                                                                              • Section 2 Weather
                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Coriolis Effect
                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                  • Section 3 Climate
                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                    • Visualizing Earths Biogeophysical System
                                                                                                                                                                                                                                                                                                      • Section 4 Earths Changing Climates
                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                        • Applying Math Carbon Dioxide (CO2) Concentration
                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Investigating Microclimate
                                                                                                                                                                                                                                                                                                        • Science and Language Arts The Grapes of Wrath
                                                                                                                                                                                                                                                                                                          • Chapter 17 Study Guide
                                                                                                                                                                                                                                                                                                          • Chapter 17 Review
                                                                                                                                                                                                                                                                                                          • Chapter 17 Standardized Test Practice
                                                                                                                                                                                                                                                                                                              • Unit 5 Matter and Earth Materials
                                                                                                                                                                                                                                                                                                                • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                  • Launch Lab Demonstrate the Distillation of Water
                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                  • Section 1 Composition of Matter
                                                                                                                                                                                                                                                                                                                    • Visualizing Elements
                                                                                                                                                                                                                                                                                                                    • MiniLAB Classifying Materials
                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                    • Lab Comparing Pure Substances and Mixtures
                                                                                                                                                                                                                                                                                                                      • Section 2 Properties of Matter
                                                                                                                                                                                                                                                                                                                        • Integrate Environment
                                                                                                                                                                                                                                                                                                                        • MiniLAB Separating Ink
                                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                                        • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                        • Applying Math The Law of Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Measuring the Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Science Stats Intriguing Elements
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Study Guide
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Review
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                            • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                              • Launch Lab Inferring What You Cant Observe
                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                              • Section 1 Structure of the Atom
                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling an Aluminum Atom
                                                                                                                                                                                                                                                                                                                                • Visualizing The Atomic Model
                                                                                                                                                                                                                                                                                                                                  • Section 2 Masses of Atoms
                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                    • Applying Science How can radioactive isotopes help tell time
                                                                                                                                                                                                                                                                                                                                      • Section 3 The Periodic Table
                                                                                                                                                                                                                                                                                                                                        • MiniLAB Organizing a Personal Periodic Table
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Career
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                                                                                                                                                                        • Lab A Periodic Table of Foods
                                                                                                                                                                                                                                                                                                                                        • Lab Use the Internet Whats in a name
                                                                                                                                                                                                                                                                                                                                        • Science and History A Chilling Story
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Study Guide
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Review
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                            • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                              • Launch Lab Earth Materials at Home and School
                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                              • Section 1 Minerals
                                                                                                                                                                                                                                                                                                                                                • MiniLAB Identifying Salts Crystal System
                                                                                                                                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                • Lab Be a Mineral Detective
                                                                                                                                                                                                                                                                                                                                                  • Section 2 Igneous Rocks
                                                                                                                                                                                                                                                                                                                                                    • Applying Math Extrusive Igneous Rock Classification
                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                      • Section 3 Sedimentary Rocks
                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Evaporites
                                                                                                                                                                                                                                                                                                                                                          • Section 4 Metamorphic Rocks and the Rock Cycle
                                                                                                                                                                                                                                                                                                                                                            • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                            • Visualizing Shock Metamorphic Rock
                                                                                                                                                                                                                                                                                                                                                            • Lab Identifying Rocks
                                                                                                                                                                                                                                                                                                                                                            • Science and Society Earth Materials at Work
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Study Guide
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Review
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                  • Launch Lab Have you got the time
                                                                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                                                                  • Section 1 Weathering and Soil
                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing a Disappearing Seasoning
                                                                                                                                                                                                                                                                                                                                                                    • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                    • Lab Graphing Soil Textures
                                                                                                                                                                                                                                                                                                                                                                      • Section 2 Shaping the Landscape
                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Runoff
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                          • Section 3 Groundwater
                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Porosity Volume
                                                                                                                                                                                                                                                                                                                                                                            • Visualizing The Role of Groundwater in Shaping Earths Surface
                                                                                                                                                                                                                                                                                                                                                                            • Integrate Environment
                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                              • Section 4 Geologic Time
                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                                                                                                • Lab Its about time - relative that is
                                                                                                                                                                                                                                                                                                                                                                                • Science and Society Tapping into the Underground
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Review
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                      • Unit 6 Interactions of Matter
                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                          • Lab Chemical Bonds and Mixing
                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Stability in Bonding
                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                            • Lab Atomic Trading Cards
                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Types of Bonds
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Observing a Bond Type
                                                                                                                                                                                                                                                                                                                                                                                                • Visualizing Polar Molecules
                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Writing Formulas and Naming Compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math Determining a Formula
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Science Can you name binary ionic compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Making a Hydrate
                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Model and Invent - Modeling Chemical Bonding
                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Sticky Subject
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Review
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab RustingmdashA Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Chemical Changes
                                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Designing a Team Equation
                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Chemical Equations
                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math Barium Sulfate Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Classifying Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 4 Reaction Rates and Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing Chemical Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Creating a Colorful Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab To Glow or Not to Glow
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Investigating Reaction Conditions
                                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Clumsy Move Pays Off
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Review
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab Magic Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 How Solutions Form
                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                                                                                                                                                                                                                                                            • Visualizing Metal Alloys
                                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Observing the Effect of Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Solubility and Concentration
                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Acids Bases and Salts
                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing Acid Relief
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Strength of Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Determining Acidity
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Saturated Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and Society Acid Rain
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab The Size of a Nucleus
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Strong Force
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Nuclear Decay
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Detecting Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math The Age of Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Social Studies
                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Nuclear Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling a Nuclear Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Visualizing PET Scans
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Chain Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Model and Invent Modeling Transmutations
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and History The Nuclear Alchemist
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Study Guide
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                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 26 Stars and Galaxies
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab Stars in the Sky
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Observing the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling a Telescope
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math The Magnifying Power of Telescopes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Evolution of Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Counting Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing H-R Diagrams of Star Clusters
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Star Cluster Age
                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 3 Galaxies and the Milky Way
                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 4 Cosmology
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Lab Model and Invent - Expansion of the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Science and Language Arts Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Review
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 3 Motion Acceleration and Forces
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 7 The Earth-Moon-Sun System
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 9 Heat and States of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 10 Waves
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 11 Sound and Light
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 14 Magnetism
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 18 Classification of Matter
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Page 9: 706 S1 318-326 GPS09 - Light-and-Sound - home · PDF fileWhat sound does a ruler make? ... sound waves cannot travel in empty space where there are no particles. ... sound travels

326 CHAPTER 11 Sound and Light

Self Check

1 Explain how sound travels from your vocal cords to

your friendrsquos ears when you talk

2 Explain how the loudness of a sound wave depends on

the intensity of the sound wave

3 Draw and label a diagram that explains the Doppler

effect

4 Describe at least three uses of ultrasonic technology in

medicine

5 Think Critically How could sonar technology be used

to locate deposits of oil and minerals

Summary

Sound Waves

bull Sound waves are compressional waves that

are produced by vibrating objects

bull Sound usually travels fastest in solids and

slowest in gases

bull Sound travels faster as the temperature of

the medium increases

Properties of Sound

bull The amplitude of sound waves increases as

the density of particles increases in the com-

pressions and decreases in rarefactions

bull Loudness is the human perception of the

intensity of sound waves Pitch is the human

perception of the frequency of sound waves

bull The Doppler effect is the change in the fre-

quency of a sound wave when the source of

the sound is moving relative to a listener

6 Calculate Time How long would it take a sound

wave from a car alarm to travel 10 km in air if the air

temperature were 0degC

7 Calculate Distance If sound travels in the ocean with

a speed of 1500 ms how far will a sonar pulse travel

in 45 s

Ultrasound in Medicine High-frequency soundwaves can also be used to remove dirt buildup on jew-elry and glassware One of the most important uses ofultrasonic waves though is in medicine Using spe-cial instruments medical professionals can sendultrasonic waves into a specific part of a patientrsquosbody Reflected ultrasonic waves are used to examinedifferent body parts and to detect and monitor cer-tain types of heart disease and cancer Ultrasoundimaging also is used to monitor the development of afetus as shown in Figure 7 However ultrasound doesnot produce good images of the bones and lungsbecause hard tissues and air absorb the ultrasonicwaves instead of reflecting them

High-frequency sound waves can be used to treatcertain medical problems For example sometimes small harddeposits of calcium compounds or other minerals form in thekidneys making kidney stones In the past physicians had toperform surgery to remove kidney stones Now ultrasonic treat-ments are commonly used to break them up instead Bursts ofultrasound create vibrations that cause the stones to break intosmall pieces that can easily pass out of the body with the urineA similar treatment is available for gallstones

Figure 7 Ultrasonic waves are

directed into a pregnant womanrsquos

uterus to form images of her fetus

More Section Review gpesciencecom

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Opaque

Translucent

Transparent

SECTION 2 Reflection and Refraction of Light 327

The Interaction of Light and MatterLook around your darkened room at night You know that

some of the objects are brightly colored but they look gray orblack in the dim light Turn on the light and you can see all theobjects in the room clearly including their colors What you seedepends on the amount of light in the room and the color of theobjects For you to see an object it must reflect or emit somelight that reaches your eyes

Absorption Transmission and Reflection Objects canabsorb light reflect light and transmit lightmdashallow light to passthrough them The type of matter in an object determines theamount of light it absorbs reflects and transmits For examplethe opaque material in the top candleholder in Figure 8 onlyabsorbs and reflects lightmdashno light passes through it As a resultyou cannot see the candle inside Materials that allow some lightto pass through them like the material of the middle candle-holder in Figure 8 are described as translucent You cannot seeclearly through translucent materials

Transparent materials such as the bottom candleholder inFigure 8 transmit almost all the light striking them so you cansee objects clearly through them Only a small amount of lightis absorbed and reflected by transparent materials

Reflection andRefraction of Light

Reading Guide

Describe how light waves interact

with matter Explain the difference between

regular and diffuse reflection Define the index of refraction of a

material Explain why a prism separates

white light into different colors

The images you see every day are

due to the behavior of light waves

Review Vocabulary

visible light an electromagnetic

wave with wavelengths between

about 400 and 700 billionths of a

meter

New Vocabulary

bull opaque

bull translucent

bull transparent

bull index of refraction

Figure 8 These candleholders

interact with light differently

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328 CHAPTER 11 Sound and Light

Reflection of LightHave you glanced in a mir-

ror today You see your reflec-tion in the mirror when light isreflected off you strikes themirror and is reflected off themirror into your eye Becauselight behaves as a wave itobeys the law of reflection asshown in Figure 9 Recall thataccording to the law of reflec-tion the angle at which a lightwave strikes a surface is thesame as the angle at which it is

reflected Light reflected from any surfacemdasha mirror or a sheetof papermdashobeys this law

Regular and Diffuse Reflection Why can you see yourreflection in a store window but not in a sheet of paper Theanswer has to do with the smoothness of the surfaces A smootheven surface such as a pane of glass produces a sharp image byreflecting parallel light waves in only one direction Reflection oflight waves from a smooth surface is regular reflection To causea regular reflection the roughness of a surface must be less thanthe wavelengths it reflects A sheet of paper has an uneven sur-face that causes incoming parallel light waves to be reflected inmany directions as shown in Figure 10 Reflection of light froma rough surface is diffuse reflection

Scattering Diffuse reflection is a type of scattering thatoccurs when light waves traveling in one direction are made totravel in many different directions Scattering also occurs whenlight waves traveling through the air reflect off small particlesAn example is light scattering off the small water droplets thatmake up a cloud Scattering causes the cloud to appear whiteeven though the droplets are transparent

What is scattering of light

Figure 9 According to the law of

reflection light is reflected so that

the angle of incidence always

equals the angle of reflection

Figure 10 A sheet of paper

has an uneven surface that

produces a diffuse reflection

Explain Use the law ofreflection to explain why arough surface causes parallellight waves to be reflected inmany directions

Mirror

i = angle of

incidence

i

r

i

r

r = angle of

reflection

Normal

Normal

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Refraction of LightWhat occurs when a light wave passes from one material to

anothermdashfrom air to water for example Recall that refractionis caused by a change in the speed of a wave when it passes fromone material to another If the light wave is traveling at an angleto the boundary between the materials and the speed of light isdifferent in the two materials the wave will be bent or refracted

Why does refraction occur

The Index of Refraction The amount of bending that takesplace depends on the speeds of light in both materials Thegreater the change in speed the more the light will be bent asit passes at an angle from one material to the other Figure 11

shows an example of refraction Every material has an index ofrefraction which is the ratio of the speed of light in a vacuum tothe speed of light in the material The index of refraction indi-cates how much the speed of light is reduced in the materialcompared to its speed in empty space

The larger the index of refraction the more light is sloweddown in the material For example because glass has a largerindex of refraction than air light moves more slowly in glassthan air The index of refraction is usually largest for solids andsmallest for gases

Prisms A sparkling glass prism hangs in a sunny windowrefracting the sunlight and projecting a colorful pattern onto thewalls of the room How does the refraction of light create thesecolors The spectrum of colors is produced because the speed oflight in a material also depends on the wave-length of the light In a glass prism light waveswith longer wavelengths such as red light wavesare slowed less than light waves with shorterwavelengths such as blue light waves

Figure 12 shows what occurs when whitelight passes through a prism White light suchas sunlight is made up of light waves withrange of wavelengths from red to blue The tri-angular prism refracts the light twicemdashoncewhen it enters the prism and again when itleaves the prism and reenters the air Becausethe longer wavelengths of light are slowed lessthan the shorter wavelengths are red light isbent the least As a result of these differentamounts of bending the different colors areseparated when they emerge from the prism

Figure 11 The spoon looks

broken because light waves are

refracted as they change speed

when they pass from the water to

the air

329

Figure 12 Refraction causes a

prism to separate a beam of white

light into different colors

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330 CHAPTER 11 Sound and Light

Self Check

1 Compare and contrast opaque transparent and

translucent materials Give one example of each

2 Discuss why you can see your reflection in a smooth

piece of aluminum foil but not in a crumpled ball of foil

3 Infer what happens to light waves that are reflected off

dust particles in the air

4 Explain what happens to white light when it passes

through a prism

5 Think Critically Suppose a material has the same index

of refraction as water How would a light wave change

direction as it traveled from water into this material

Summary

Light and Matter

bull The amount of light that is absorbed

reflected or transmitted depends on the

material making up the object

Reflection of Light

bull Light waves always obey the law of reflection

the angle of incidence equals the angle of

reflection

bull Regular reflection causes parallel light waves

to be reflected in only one direction

bull Diffuse reflection causes parallel light waves

to be reflected in many directions

bull Scattering occurs when light waves are reflected

and travel in many different directions

Refraction of Light

bull Refraction occurs when a light wave changes

speed in moving from one material to another

bull The index of refraction of a material indicates

how much light slows down in the material

6 Find an Angle A light wave strikes a mirror at an

angle of 42deg from the surface of the mirror What

angle does the reflected wave make with the normal

7 Find an Angle A light wave reflects from a mirror at

27deg from the normal What was the angle between

the mirror and the incident wave

Mirages When yoursquore traveling in a car you might see whatlooks like a pool of water on the road ahead As you get closerthe water seems to disappear Yoursquove seen a miragemdashan image ofa distant object produced by the refraction of light through airlayers of different densities Mirages result when the air atground level is much warmer or cooler than the air above asshown in Figure 13 The density of air increases as air cools andlight waves move slower in cooler air than in warmer air As aresult light waves are refracted as they pass through air layerswith different temperatures

Figure 13 Mirages result when

air near the ground is much

warmer or cooler than the air

above This causes light waves

reflected from an object to refract

creating one or more additional

images

MirageWarm air

Cool air

More Section Review gpesciencecom

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SECTION 3 Mirrors Lenses and the Eye 331

Light RaysLight sources send out light waves in all directions These

waves spread out like ripples on the surface of water spread outfrom the point of impact of a pebble You can think of the lightcoming from the source as being many narrow beams of light trav-eling in all directions Each narrow light beam is called a light ray

MirrorsA mirror is any surface that produces a regular reflection A pool

of still water a metal pan and even the back of a shiny spoon can bemirrors Mirrors can be flat curved inward or curved outward

Plane Mirrors A flat smooth mirror is a plane mirror Whenyou look in a plane mirror your image appears upright If youstand 1 m from the mirror your image appears 1 m behind themirror or 2 m from you In fact your image is what a friend stand-ing 2 m from you would see Figure 14 shows how your image isformed First light rays from a light source strike you Every pointthat is struck by the light rays reflects these rays so they travel out-ward in all directions If your friend were looking at you thesereflected light rays coming from you would enter her eyes so shecould see you However if a mirror is placed between you and yourfriend light rays are reflected from the mirror back to your eyes

Mirrors Lenses andthe Eye

Reading Guide

Describe how images are formed

by three types of mirrors Explain how convex and concave

lenses form images Explain how the human eye

enables you to see Describe how lenses are used to

correct vision problems

Mirrors and lenses are used in optical

instruments such as cameras and

telescopes

Review Vocabulary

reflection the process of changing

direction after striking a surface

New Vocabulary

bull plane mirror

bull concave mirror

bull convex mirror

bull convex lens

bull concave lens

Figure 14 Seeing an image of

yourself in a mirror involves two

sets of reflections light rays are

reflected from you and then are

reflected by the mirror

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332 CHAPTER 11 Sound and Light

Virtual and Real Images The forma-tion of an image by a plane mirror isshown in Figure 15 Your brain assumesthat light rays travel in a straight line As aresult rays that enter your eyes seem tocome from behind the mirror This makesthe image seem to be behind the mirrorHowever no light rays actually passthrough the place where the image seemsto be located This type of image is called avirtual image Plane mirrors always formvirtual images If light rays from an objectpass through the location of the image theimage is called a real image Curved mir-rors can form both real and virtual images

Concave Mirrors If the surface of a mirror is curved inwardit is called a concave mirror as shown in Figure 16 The opticalaxis is an imaginary straight line drawn perpendicular to thesurface of the mirror at its center Every light ray traveling par-allel to the optical axis is reflected through a point on the opti-cal axis called the focal point The distance from the center ofthe mirror to the focal point is called the focal length

The image formed by a concave mirror depends on the loca-tion of the object relative to the focal point Figure 16 shows acandle located more than twice the focal length from the mirrorAlthough many light rays come from each point on the candleonly two rays from the same point are shown Ray A passesthrough the focal point and then reflects off the mirror movingparallel to the optical axis Ray B travels parallel to the opticalaxis before reflecting off the mirror and passing through thefocal point The point where the two rays meet is the location ofthe image of the original point on the candle The image formedis a real image because light rays from the candle pass throughthe place where the image is located

Figure 16 Rays A and B start from the same

place on the candle travel in different directions

and meet again on the reflected image

Diagram how two other points on the image ofthe candle are formed

Figure 15 Your brain interprets

the light rays reflected by the

mirror as coming from a point

behind the mirror

Infer how the size of your imagein a plane mirror depends on yourdistance from the mirror

Focalpoint

Optical axis

Ray B

Ray A

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SECTION 3 Mirrors Lenses and the Eye 333

Images Produced by a ConcaveMirror When an object is between oneand two focal lengths from a concavemirror the image is real inverted andlarger than the object An object closerthan one focal length from a concavemirror produces a virtual image that isupright and larger than the object Noimage is produced if the object islocated at the focal point

Convex Mirrors When you are in astore look up toward one of the backcorners or at the end of an aisle to see ifa large rounded mirror is mountedthere You can see a large area of the store in such a mirror Amirror that curves outward like the back of a spoon is called aconvex mirror Light rays that hit a convex mirror diverge orspread apart after they are reflected Figure 17 shows how therays from an object are reflected by a convex mirror to form animage The reflected rays diverge and never meet so a convexmirror forms only a virtual image The image also is upright andsmaller than the actual object is

Describe the image formed by a convex mirror

LensesWhat do your eyes have in common with cameras eyeglasses

and microscopes Each of these contains at least one lens A lens is atransparent object with at least one curved surface that causes lightrays to refract The image that a lens forms depends on the shape ofthe lens Like curved mirrors lenses can be convex or concave

Convex Lenses A convex lens is thicker in the middle than atthe edges Its optical axis is an imaginary straight line that is per-pendicular to the surface of the lens at its thickest point When lightrays approach a convex lens traveling parallel to its opticalaxis the rays are refracted toward the center of the lens asin Figure 18 Light rays traveling along the optical axis arenot bent at all All light rays traveling parallel to the opti-cal axis are refracted so they pass through a single pointwhich is the focal point of the lens The less curved thesides of the lens the less light rays are bent As a resultlenses with flatter sides have longer focal lengths Figure 19

on the next page shows that convex lenses can form eitherreal or virtual images

Figure 18 Convex lenses are

thicker in the middle than at the

edges Light rays that are parallel

to the optical axis are refracted so

that they pass through the focal

point A light ray that passes

through the center of the lens is

not refracted

Figure 17 A convex mirror

forms a reduced upright virtual

image

Optical axis

Ray A

Ray B

Focallength

Focalpoint

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Figure 19

VISUALIZING IMAGES FORMED BY A CONVEX LENS

334 CHAPTER 11 Sound and Light

Aconvex lens can form images that are real or virtual enlarged or reduced and upright orinverted Just as for a concave mirror the type of image formed by a convex lens depends on thelocation of the object relative to the focal point of the lens

Optical axis

One

focal

length

Two

focal

lengthsRay B

Image

Ray A

Object

Focal

point

Optical axis

One

focal

length

Two

focal

lengths

Ray B

Ray AObject

Image

Focal

point

Optical axis

Ray B

ObjectRay A

One

focal

length

Focal

pointImage

If the object is more than two focal lengths from the lens the image formed is real inverted andsmaller than the object As the object moves farther from the lens the image becomes smaller

If the object is between one and two focal lengths from the lens the image formed is real invertedand larger than the object As the object moves closer to the focal point the image becomes larger

If the object is less than one focal length from the lens the image is virtual upright and larger thanthe object The image is virtual because the light rays from the object diverge after they pass throughthe lens The image becomes smaller as the object moves closer to the lens

SECTION 3 Mirrors Lenses and the Eye 335

Concave Lenses A concave lens is thinnerin the middle and thicker at the edges Asshown in Figure 20 light rays that passthrough a concave lens bend away from theoptical axis The rays spread out and nevermeet so a real image is never formed Theimage is always virtual upright and smallerthan the object is Concave lenses are used insome types of eyeglasses and some telescopesConcave lenses usually are used in combinationwith other lenses

What type of image is formed by a concave lens

The Human EyeWhat determines how well you can see the words on this

page If you donrsquot need eyeglasses the structure of your eye givesyou the ability to focus on these words and other objects aroundyou Look at Figure 21 Light enters your eye through a trans-parent covering on your eyeball called the cornea The corneacauses light rays to bend so that they converge The light thenpasses through an opening called the pupil Behind the pupil isa flexible convex lens Muscles attached to the lens change itsshape to help focus light forming a sharp image on your retina

The retina is the inner lining of your eye The retina con-tains light-sensitive cells that convert an image into electricalsignals These signals then are carried along the optic nerve toyour brain to be interpreted With this complex structurethe human eye is capable of seeing clearly in bright and dimconditions focusing on both near and far objects and alsodetecting colors

Figure 20 A concave lens

refracts light rays so they spread

out away from the optical axis

Classify Is a concave lens mostlike a concave mirror or a convexmirror

Optical axis

Retina

Focalpoint

Pupil

Cornea

Lens

Optic nerve

Figure 21 The cornea and lens in your eye

bend light rays so that a sharp image is

formed on the retina

Eye Doctors Optometristsand ophthalmologists treatmany different eye prob-lems They often useadvanced technology todiagnose and correct mal-functioning parts of theeye Research an eye prob-lem and how it is treatedWrite a paragraph describ-ing what parts of the eyeare affected by the problemand how doctors correct it

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336 CHAPTER 11 Sound and Light

Brightness and Intensity The human eye can adjust to thebrightness of the light that strikes it If you step outside on asunny day you may have to shade your eyes against the intensityof the sunlight Light intensity is the amount of light energy thatstrikes a certain area each second Brightness is the human per-ception of light intensity Sunlight seems bright because a largeamount of light energy strikes your retina each second Youreyes respond to bright light by decreasing the size of your pupilThis reduces the amount of light that enters your eye and strikesthe retina

Intensity depends on your distance from a light source Ifyou move away from a bare lightbulb you can see how theintensity of the light rapidly decreases Because light rays spreadout from the source less light energy strikes your retina thefarther away you are from the bulb

Correcting Vision ProblemsIf you have good vision you should be able to see objects

clearly when they are 25 cm or farther away from your eyes Asharp image of an object should be formed on your retinaHowever for many people the image is blurry or formed in thewrong place causing vision problems

Farsightedness If you can see distant objects clearly butcanrsquot bring nearby objects into focus then you are farsighted Inthis case the eyeball might be too short or the lens isnrsquot curvedenough to form a sharp image of nearby objects on the retinaas shown in Figure 22 To correct the problem convex lensescan be used to bend incoming light rays so they converge beforethey enter the eye

Experimenting withFocal LengthsProcedure1 Complete the safety form

2 Fill a glass test tube with

water and seal it with a

lid or stopper3 Type or print SULFUR

DIOXIDE in capital letters

on a piece of paper4 Set the test tube horizon-

tally over the words

Record your observations

5 Hold the tube at several

heights above the words

Record your observations

Analysis1 Describe how the words

changed as the height of

the test tube increased

2 Classify the image at each

height as real or virtual

Focal

point

Correctedfarsighted eye

Light fromnearby object

Focalpoint

Light fromnearby object

Farsighted eye

The focal length of a farsighted eye is too long to form

a sharp image of nearby objects on the retina

A convex lens in front of a farsighted eye enables a sharp

image of nearby objects to be formed on the retina

Figure 22 Farsightedness can

be corrected by convex lenses

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SECTION 3 Mirrors Lenses and the Eye 337

Self Check

1 Diagram how light rays from an object are reflected by

a convex mirror to form an image

2 Infer how the size of the image changes if an object

that is less than one focal length from a concave mirror

moves closer to the mirror

3 Explain how the focal length of a convex lens changes

as the sides of the lens become less curved

4 Compare the image of an object less than one focal

length from a convex lens with the image of an object

more than two focal lengths from the lens

5 Think Critically Describe the image formed by a light

source placed at the focal point of a convex lens

Summary

Mirrors

bull A plane mirror forms upright virtual images

bull The image formed by a concave mirror

depends on the location of the object relative

to the focal point

bull Convex mirrors always produce virtual upright

images that are smaller than the object

Lenses

bull The image formed by a convex lens depends

on the distance of the object from the lens

bull Concave lenses always form virtual upright

images that are smaller than the object

The Eye and Vision

bull The eye contains a lens that changes shape to

produce sharp images on the retina

bull Farsightedness occurs when the eye cannot

form a sharp image of nearby objects

Nearsightedness occurs when the eye cannot

form sharp images of distant objects

6 Calculate Object Distance If you looked through a

convex lens with a focal length of 15 cm and saw a

real inverted enlarged image what is the maximum

distance between the lens and the object

Nearsightedness If you have nearsighted friends you knowthat they can see only nearby objects clearly Their eyes cannotform a sharp image on the retina of an object that is far awayInstead the image is formed in front of the retina as shown inFigure 23 To correct this problem a nearsighted person canwear concave lenses Figure 23 shows how a concave lens causesincoming light rays from distant objects to diverge before theyreach the eye Then the rays can be focused by the eye to form asharp image on the retina

Figure 23 Nearsightedness can

be corrected with concave lenses

Focalpoint

Light fromdistant object

Nearsighted eye

Focalpoint

Light fromdistant object

Correctednearsighted eye

When a nearsighted person looks at distant objects a

sharp image is formed in front of the retina

A concave lens in front of a nearsighted eye makes light

rays diverge so a sharp image is formed on the retina

More Section Review gpesciencecom

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How can you see the back of your head You

can use two mirrors to view a reflection of a

reflection of the back of your head

Real-World ProblemHow many images are seen in two mirrors

Goal Infer how the number of images depends

on the angle between two mirrors

Materialsplane mirrors (2) protractor

masking tape paper clip

Safety Precautions

Handle glass mirrors and paper clips carefully

Procedure1 Complete the safety form

2 Lay one mirror on top of the other with the

mirror surfaces together Tape together one

side so they can open and close Use tape to

label them L and R for left and right

3 Open the mirrors and stand them on a sheet

of paper at an angle of 72deg

4 Bend one leg of a paper clip up 90deg and

place it close to the front of the R mirror

5 Count the number of images of the paper

clip you see in the R and L mirrors Record

these numbers in your data table

6 The mirrors create an image of a circle

divided into wedges Record the number

of wedges

7 Hold the R mirror still and slowly move the Lmirror to 90deg Record the numbers of images

of the clip and wedges in the circle Repeat

this time opening the mirrors to 120deg

Conclude and Apply1 Infer the relationship between the number

of wedges and paper clip images

2 Determine the angle that would divide a

circle into six wedges Hypothesize how

many images would be produced Test your

hypothesis

Reflections of Reflections

Demonstrate for younger students the

relationship between the angle of the

mirrors and the number of reflections

338 CHAPTER 11 Sound and Light

Angle

Number of Number

of Mirrors Paper Clip Images

of Wedges R L

72ordm

90ordm

120ordm

Images and Wedges Seen in the Mirrors

Do not write in this book

SECTION 4 Light and Color 339

Why Objects Have ColorWhy do some apples appear red while others look green or

yellow An objectrsquos color depends on the wavelengths of light itreflects Recall that white light is a blend of all colors of visiblelight When a red apple is struck by white light it reflects redlight back to your eyes and absorbs all of the other colorsFigure 24 shows white light striking a green leaf Only the wave-lengths corresponding to green light are reflected to your eyes

Although some objects appear to be black black isnrsquot acolor Black is the absence of visible light Objects that appearblack absorb all colors of light and reflect little or no light backto your eyes White objects appear to be white because theyreflect all colors of visible light

Why does a white object appear white

Colored Filters Wearing tinted glasses changesthe color of almost everything you see If the lensesare yellow the world takes on a golden glow If theyare rose colored everything looks rosy Somethingsimilar would occur if you placed a colored clearplastic sheet over this white page The paper wouldappear to be the same color as the plastic The plasticsheet and the tinted lenses are filters A filter is atransparent material that transmits one or more col-ors of light but absorbs all others The color of a fil-ter is the color of the light that it transmits

Light and Color

Reading Guide

Explain how you see color Describe the difference between

light color and pigment color Predict what happens when dif-

ferent colors are mixed

From traffic lights to great works of

art color is an important part of your

world

Review Vocabulary

retina inner layer of the eye con-

taining cells that convert light

images into electrical signals

New Vocabulary

bull pigment

Figure 24 This leaf absorbs all

wavelengths of visible light except

the wavelengths you see as green

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340 CHAPTER 11 Sound and Light

Looking Through Colored Filters Figure 25 shows howthe color of an object can change when you look at it throughvarious colored filters The cooler looks blue under white lightbecause it reflects only the wavelengths of blue light that strikeit If you look at the cooler through a blue filter the cooler stilllooks blue because the blue filter transmits the reflected bluelight However if you look at the cooler through a red filter thecooler seems black because the red filter blocks the blue lightreflected by the cooler

Why does a blue object appear black whenviewed through a red filter

Seeing ColorAs you approach a busy intersection the color of the traffic

light changes from green to yellow to red On the cross street thecolor changes from red to green At a busy intersection trafficsafety depends on your ability to detect color changes rapidlyHow do you see colors

Light and the Eye In a healthy eye light enters the eyethrough the cornea is focused by the lens and finally forms animage on the retina The retina is made up of two types of cellsthat absorb light as shown in Figure 26 When these cellsabsorb light energy chemical reactions convert light energy intonerve impulses that are transmitted to the brain One type ofcell in the retina called a cone enables you to distinguish colorsand detailed shapes of objects Cones need bright light to gener-ate nerve impulses so they do not operate in dim light As aresult even brightly colored objects might look gray or black indim light

Figure 25 The color of this

cooler changes when viewed

through different color filters

Topic Color BlindnessVisit for Web

links to information about the

causes of color blindness

Activity Research the causes

and types of color blindness Find

out how cones are related to the

ability to distinguish colors

gpesciencecom

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SECTION 4 Light and Color 341

Cones and Rods Your eyes have three types of cones each ofwhich responds to a different range of wavelengths Red conesrespond to mostly red and yellow light Green cones respond tomostly yellow and green light Blue cones respond to mostlyblue and violet light The second type of cell in the retina calleda rod is sensitive to dim light and enables you to see at nightHowever rod cells do not enable you to see colors

Interpreting Color Why does a bananalook yellow The light reflected by the

banana causes the cone cells that are sensitive to red and greenlight to send signals to your brain Your brain could get the samesignal if a mixture of red light and green light reached your eyesThis mixture also would cause your red and green cones torespond and you would see the color yellow As a result lightwith wavelengths corresponding to yellow light and light that isa mixture of red and green light both cause the color yellow tobe seen What happens when you look at a white shirt You seewhite when all wavelengths of visible light enters your eyes Thenall three sets of cones cells send signals to the brain The com-bination of these signals cause you to see the shirt as white

Color Blindness If one or more of your sets of cone cellsdo not function properly you might not be able to distinguishcertain colors This condition is called color blindness orcolor deficiency About eight percent of men and one-halfpercent of women have some form of color blindness Themost common form of color blindness makes it difficult todistinguish between red and green Figure 27 shows an imagethat is used in a test for redndashgreen color blindness Becausered and green are used in traffic signals drivers and pedestri-ans must be able to identify them

Retina

Rod

Cone

Lens

Figure 27 Color blindness is an

inherited sex-linked condition in

which certain sets of cones in the

retina do not function properly

Identify the number that you seein the dots

Figure 26 Light enters the eye

and focuses on the retina The two

types of light-detecting cells

that make up the retina

are called rods and cones

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342 CHAPTER 11 Sound and Light

Mixing ColorsIf you have ever browsed through a paint store you have

probably seen displays where customers can select paint samplesof almost every imaginable color The colors are a result of mix-tures of pigments For example you might have mixed blue andyellow paint to produce green paint A pigment is a coloredmaterial that is used to change the color of other substancesThe color of a pigment results from the different wavelengths oflight that the pigment reflects

Mixing Colored Lights From the glowing orange of a sun-set to the deep blue of a mountain lake all the colors you see canbe made by mixing three colors of light These three colorsmdashred green and bluemdashare the primary colors of light They cor-respond to the three different types of cones in the retina ofyour eye When mixed together in equal amounts they producewhite light as Figure 28 shows Mixing the primary colors indifferent proportions can produce the colors you see

What are the primary colors of light

Paint Pigments If you were to mix equal amounts of redgreen and blue paint would you get white paint If mixing col-ors of paint were like mixing colors of light you would but mix-ing paint is different Paints are made with pigments Pigmentsproduce color as a result of the wavelengths of light they reflectPaint pigments usually are made of chemical compounds suchas titanium oxide a bright white pigment and lead chromatewhich is used for painting yellow lines on highways

Figure 28 White light is pro-

duced when the three primary col-

ors of light are mixed in equal

amounts

Color for PhotosynthesisPlant pigments determinethe wavelengths oflight for photosynthesisLeaves usually look greenbecause of the pigmentchlorophyll Chlorophyllabsorbs most wave-lengths of visible lightexcept green which itreflects However not allplants are green Researchdifferent plant pigmentsto find out how they allowplant species to survive indiverse habitats

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SECTION 4 Light and Color 343

Self Check

1 Identity what colors are reflected and what colors are

absorbed if a white light shines on a red shirt

2 Discuss how the primary colors of light differ from the

primary pigment colors

3 Explain why a red apple would appear black if you

looked at it through a blue filter

4 Determine why a white fence appears to be white instead

of multicolored if all colors are present in white light

5 Think Critically Light reflected from an object passes

through a green filter then a red filter and finally a

blue filter What color will the object seem to be

Summary

Why Objects Have Color

bull The color of an object is determined by the

wavelengths of light it reflects

bull The color of a filter is the color of the light the

filter transmits

Seeing Color

bull Rod and cone cells are light-sensitive cells

found in the retina of the human eye

bull Rod cells are sensitive to dim light Cone cells

enable colors to be seen

bull There are three types of cone cells One type

responds to red light another to green light

and another to blue light

Mixing Colors

bull Red green and blue are the primary light

colors Any color of light can be created by

mixing these primary light colors

bull Any pigment color can be formed by mixing

the primary pigment colorsmdashmagenta cyan

and yellow

6 Use Percentages In the human eye there are about

120000000 rods If 90000000 rods trigger at once

what percentage of the total number of rods triggered

7 Convert Units The wavelengths of light are measured

in nanometers (nm) which equals 0000001 mm

Find the wavelength in mm of a light wave that has a

wavelength of 690 nm

Mixing Pigments You can make any pigment color by mixingdifferent amounts of the three primary pigmentsmdashmagenta(bluish red) cyan (greenish blue) and yellow In fact color print-ers use these pigments as well as black ink to make full-colorprints like the pages in this book A primary pigmentrsquos colordepends on the wavelengths of the light that it reflects Actuallypigments both absorb and reflect a range of colors in sending asingle color message to your eye For example in white lightyellow pigment appears yellow because it reflects red and greenlight but absorbs the other wavelengths of visible light The colorof a mixture of two primary pigments is determined by theprimary colors of light that both pigments reflect

Look at Figure 29 The area in the center where the colors alloverlap appears to be black because the three blended primarypigments absorb all the primary colors of light Recall that theprimary colors of light combine to produce white light They arecalled additive colors However when the primary pigment col-ors are combined they absorb all wavelengths of visible light andproduce black Because black results from the absence ofreflected light the primary pigments are called subtractive colors

Figure 29 The three primary

pigment colors appear to be black

when they are mixed

Describe how the primary pigmentcolors are similar to the primary col-ors of light

More Section Review gpesciencecom

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Design Your OwnDesign Your Own

344

Real-World ProblemWhat loud noises do you enjoy and which ones do you find annoying

Most people enjoy a music concert performed by their favorite artist or

the booming displays of fireworks on the Fourth of July Most people

enjoy these loud sounds for short periods of time However certain

other loud noises such as traffic sirens and loud talking can be

annoying Constant annoying noises are called noise pollution What

can be done to reduce noise pollution What types of barriers will best

block out noise pollution

Form a HypothesisBased on your experiences with loud noises form a hypothesis that

predicts the effectiveness of different types of barriers at blocking out

noise pollution

Test Your HypothesisMake a Plan

1 Complete the safety form

2 Decide what type of barriers or materials you will test

3 Describe exactly how you will use these materials

Goals Design an experiment

that tests the effective-

ness of various types of

barriers and materials

for blocking out noise

pollution

Test different types of

materials and barriers

to determine the best

noise blocks

Possible Materialsradio CD player horn

drum or other loud

noise source

shrubs trees concrete

walls brick walls stone

walls wooden fences

parked cars or hanging

laundry

sound meter

meterstick or metric tape

measure

Blocking NfisePollution

4 Identify the controls and variables you will use in your

experiment

5 List the steps you will use and describe each step precisely

6 Prepare a data table in your Science Journal to record your

measurements

7 Organize the steps of your experiment in logical order

Follow Your Plan

1 Ask your teacher to approve your plan and data table before

you start

2 Conduct your experiment as planned

3 Test each barrier two or three times

4 Record the results from each test in your data table in your Science Journal

Analyze Your Data1 Identify the barriers that most effectively reduced noise pollution

2 Identify the barriers that least effectively reduced noise pollution

3 Compare the effective barriers and identify common characteristics that might

explain why they reduced noise pollution

4 Compare the natural barriers you tested with the artificial barriers Which type

of barrier best reduced noise pollution

5 Compare the different types of materials the barriers were made of Which

type of material best reduced noise pollution

Conclude and Apply1 Evaluate whether your results support your hypothesis

2 Predict how your results would differ if you used a louder source of noise such

as a siren

3 Infer from your results how people living near a

busy street could reduce noise pollution

4 Identify major sources of noise pollution in or

near your home How could they be reduced

5 Research how noise pollution can be

unhealthy

LAB 345

Draw a poster illustrating how builders and

landscapers could use certain materials to

better insulate a home or office from excess

noise pollution

346 CHAPTER 11 Sound and Light

A Haiku GardenThe Four Seasons in Poems and Prints

by Stephen Addiss with Fumiko and Akira Yamamoto

Respond to the Reading1 How do the illustrations help the reader

better understand the poems2 What do you think is meant by the

word lingering in the Haiku about springsunlight

3 Linking Science and Writing Writeone haiku about summer and anotherabout fall In one poem use color tohelp you describe the season In theother use light or some property oflight to help describe the season

Research has deter-mined that there is a

connection between color and mood Warmcolors have longer wavelengths and can bemore stimulating Cool colors which haveshorter wavelengths tend to have a calmingor soothing effect on people Light and colorhave long been used as literary symbols Doesthe use of color change what you imaginewhen you read the haiku

UnderstandingLiteratureJapanese Haiku A haiku is a verse thatconsists of three lines and 17 syllables inthe Japanese language The first and thirdlines have five syllables each and themiddle line has seven syllables Why isimagination important in reading haiku

Lingering

in every pool of watermdash

spring sunlightIssa

Withered by winter

the sound of the windmdash

one-color worldBasho

Sound

1 Sound waves are compressional waves thattravel only in matter

2 The speed of sound in a material dependson the type of material as well as itstemperature

3 Loudness depends on a sound waversquos inten-sity Pitch depends on a sound waversquosfrequency

4 Sound waves are used in echolocationsonar and medical imaging

Reflection and Refractionof Light

1 Light can be absorbed reflected or trans-mitted by a material

2 When light waves are reflected theyobey the law of reflectionmdashthe angle ofincidence equals the angle of reflection

3 A light wave is refracted or bent whenit changes speed as it travels at an anglefrom one material to another

Mirrors Lenses andthe Eye

1 Plane mirrors form upright virtual images

2 Images formed by concave mirrors andconvex lenses depend on the location ofthe object relative to the focal point

3 Convex mirrors and concave lenses formvirtual upright images that are smallerthan the object

4 The lens in the human eye changes shape toproduce a sharp image on the retina

Light and Color

1 You see color when light is reflected offobjects and into your eyes

2 Cone cells in the retina are light-sensitivecells that enable you to distinguish colors

3 Red blue and green are the three primarycolors of light and can be mixed to form allother colors

4 The primary pigment colors are magentacyan and yellow

CHAPTER STUDY GUIDE 347

Use the Foldable you made at the beginningof the chapter to help you review sound and light

Interactive Tutor gpesciencecom

Complete each statement with the correctvocabulary word or phrase

1 A change in frequency due to a movingsound source is due to the

2 A flat smooth surface that reflects light andforms an image is a(n)

3 An object is if you can seethrough it clearly

4 The of a material indicates howmuch the speed of light in the materialchanges as light passes through

5 You can change the color of white paint byadding a(n) to it

6 A(n) is a reflecting surface thatcurves outward like the back of a spoon

7 The human perception of the intensity of asound wave is

Choose the word or phrase that best answerseach question

8 Which of the following best describes imageformation by a plane mirrorA) A real image is formed in front of the mirrorB) A real image is formed behind the mirrorC) A virtual image is formed in front of the

mirrorD) A virtual image is formed behind the mirror

9 For a sound with low pitch what else isalso always lowA) amplitude C) wavelengthB) frequency D) wave velocity

10 Which of the following occurs when asound source moves away from youA) The soundrsquos velocity decreasesB) The soundrsquos loudness increasesC) The soundrsquos frequency decreasesD) The soundrsquos frequency increases

Use the table below to answer question 11

11 Based on the data in the table abovewhich of the following would be the speedof sound in air at 30degCA) 3404 ms C) 3494 msB) 3464 ms D) 3534 ms

12 What happens to a light ray travelingparallel to the optical axis of a convexlens that passes through the lensA) It travels parallel to the optical axisB) It passes through the focal pointC) It is bent away from the optical axisD) It forms a virtual image

13 Light waves of which color are bent mostwhen passing through a prismA) blue C) violetB) red D) yellow

14 Which way does a concave lens bend lightA) toward its optical axisB) toward its centerC) toward its edgesD) toward its focal point

Speed of Sound in Air

Temp peed( s)

4

4

4

348 CHAPTER REVIEW

concave lens p 335concave mirror p 332convex lens p 333convex mirror p 333decibel p 322Doppler effect p 323index of refraction p 329intensity p 322

loudness p 322opaque p 327pigment p 342pitch p 323plane mirror p 331translucent p 327transparent p 327

Vocabulary PuzzleMaker gpesciencecom

Use the illustration below to answer question 15

15 Describe how the position of the candlechanged if the image of the candle movedaway from the focal point

16 Apply Acoustic scientists sometimes doresearch in rooms that absorb all soundwaves How could such a room be used tostudy how bats find their food

17 Compare White light passes through atranslucent pane of glass and shines on ashirt Both the translucent glass and theshirt appear green Compare the colors oflight that are absorbed and transmitted bythe glass and the shirt

18 Infer Most mammals including dogs andcats canrsquot see colors Infer how the retinaof a catrsquos eye might be different from theretina of a human eye

19 Determine whether a convex lens could forman image that is enlarged real and upright

20 Infer A car comes to a railroad crossingThe driver hears a trainrsquos whistle and itspitch becomes lower What can beassumed about how the train is moving

21 Compare and contrast the reflection of lightfrom a white wall with a rough surfacewith the reflection of light from a mirror

Optical axis

One

focal

length

Two

focal

lengths

Image

Ray A

Object

Focal

point

Interpreting Graphics 22 Infer why a convex mirror and a concavelens can never produce a real image

23 Predict what color a white shirt wouldappear to be if the light reflected from theshirt passed through a red filter and thenthrough a green filter

24 Explain why windows might begin to rattlewhen an airplane flies overhead

25 Communicate Some people enjoy usingsnowmobiles Others object to the noisethat they make Write a proposal for a pol-icy that seems fair to both groups for theuse of snowmobiles in a state park

CHAPTER REVIEW 349

Use the wave speed equation ν ƒλ to answer

questions 26 and 27

26 Calculate Frequency A sonar pulse has awavelength of 30 cm and a speed inwater of 1500 ms Find its frequency

27 Calculate Wavelength What is the wave-length of a sound wave with a fre-quency of 440 Hz if the speed of soundin air is 340 ms

28 Calculate Angle of Incidence A light ray isreflected from a mirror If the anglebetween the incident ray and thereflected ray is 136deg what is the angleof incidence

29 Determine Object Distance You hold anobject in front of a concave mirror witha focal length of 30 cm If you do notsee a reflected image how far from themirror is the object

30 Calculate Speed The speed of light in avacuum is 300000 kms If the index ofrefraction of water is 133 what is thespeed of light in water

More Chapter Review gpesciencecom

1 Which of the following describes the imageformed by a convex mirror

A enlarged

B inverted

C real

D virtual

Use the figure below to answer question 2

2 Which of the following describes a light raythat passes through the focal point andthen is reflected by the mirror

A It travels parallel to the optical axis

B It forms a real image

C It is reflected back through the focal point

D It forms a virtual image

3 Why does an apple look red

A It reflects red light

B It absorbs red light

C It reflects green and blue light

D It reflects all colors of light except red

Use the figure below to answer questions 4 and 5

4 When the primary colors of light are addedtogether what color appears in area H

A cyan

B magenta

C white

D yellow

5 When the primary colors of light are addedtogether what color appears in area G

A cyan

B magenta

C white

D yellow

6 Which of the following increases as the fre-quency of a sound increases

A amplitude

B intensity

C loudness

D pitch

Red Blue

Green

F

H

G K

Focal pointOptical axis

350 STANDARDIZED TEST PRACTICE

Record your answers on the answer sheet provided by your teacher or on a sheet of paper

STANDARDIZED TEST PRACTICE 351

7 Which of the following parts of the eyeenable you to see colors in bright light

A cone cells

B cornea

C lens

D rod cells

Use the graph below to answer questions 8 and 9

8 Determine how far in centimeters theimage is from the lens when the object is15 centimeters from the lens

9 How far in centimeters is the object fromthe lens when the image distance andobject distance are equal

10 A shirt has stripes that are black and whitein white light If green light shines on thisshirt what colors will the black and whitestripes be

11 If you are on a moving train what hap-pens to the pitch of a crossing bell as youapproach the crossing and then moveaway from the crossing

Use the figure below to answer question 12

12 Describe the vision problem show by thefigure and explain how this vision prob-lem can be corrected

13 Explain why the human eye can see colorsbetter in bright light than in dim light

Image Distance fora Convex Lens

Ima

ge

dis

tan

ce (

cm)

30

25

20

15

10

5 10 15 20 25 30

Object distance (cm)

Standardized Test Practice gpesciencecom

Note Units Read carefully and make note of the units used in

any measurement

  • Glencoe Physical Science with Earth Science
    • Student Edition Table of Contents
      • Unit 1 Science and Technology
        • Chapter 1 The Nature of Science
          • Launch Lab Understanding Measurements
          • Foldables
          • Section 1 The Methods of Science
            • Science Online
            • Integrate History
            • Integrate Earth Science
            • Science Online
              • Section 2 Standards of Measurement
                • Applying Math Centimeters
                • Integrate Earth Science
                • Science Online
                • MiniLAB Determining the Density of a Pencil
                • Visualizing SI Dimensions
                  • Section 3 Communicating with Graphs
                    • Applying Math Temperature
                    • MiniLAB Graphing Temperature Change
                    • Lab Whats my graph
                    • Lab Design Your Own - Developing a Measurement System
                    • Science and Language Arts Thinking in Pictures and Other Reports from My Life with Autism
                      • Chapter 1 Study Guide
                      • Chapter 1 Review
                      • Chapter 1 Standardized Test Practice
                        • Chapter 2 Science Technology and Society
                          • Lab Technology in Your Life
                          • Foldables
                          • Section 1 Science and Technology
                            • MiniLAB Researching the Past
                            • Visualizing Technology Supplying Basic Needs
                            • Science Online
                              • Section 2 Forces that Shape Technology
                                • MiniLAB Evaluating the Benefits and Consequences of Technology
                                • Integrate Environment
                                • Integrate History
                                • Applying Science What impact does the accident at Chernobyl have on the future of nuclear power
                                • Science Online
                                • Lab Who contributes CO2
                                  • Section 3 Developing Technology
                                    • Integrate Life Science
                                    • Integrate Career
                                    • Lab Model and Invent - Care Package
                                    • Oops Accidents in Science A Slippery Situation
                                      • Chapter 2 Study Guide
                                      • Chapter 2 Review
                                      • Chapter 2 Standardized Test Practice
                                          • Unit 2 Motion Forces and Energy
                                            • Chapter 3 Motion Acceleration and Forces
                                              • Launch Lab Compare Speeds
                                              • Foldables
                                              • Section 1 Describing Motion
                                                • MiniLAB Measuring Average Speed
                                                • Science Online
                                                • Applying Math Average Speed
                                                • Integrate Astronomy
                                                • Science Online
                                                  • Section 2 Acceleration
                                                    • Integrate History
                                                    • Visualizing Acceleration
                                                      • Section 3 Motion and Forces
                                                        • Science Online
                                                        • MiniLAB Comparing Friction
                                                        • Lab Force and Acceleration
                                                        • Lab Design Your Own - Comparing Motion from Different Forces
                                                        • Science and Language Arts A Brave and Startling Truth
                                                          • Chapter 3 Study Guide
                                                          • Chapter 3 Review
                                                          • Chapter 3 Standardized Test Practice
                                                            • Chapter 4 The Laws of Motion
                                                              • Launch Lab The Force of Gravity
                                                              • Foldables
                                                              • Section 1 The First Two Laws of Motion
                                                                • MiniLAB Observing Inertia
                                                                • Science Online
                                                                • Applying Math The Acceleration of a Sled Solve a Simple Equation
                                                                  • Section 2 Gravity
                                                                    • Science Online
                                                                    • Integrate Earth Science
                                                                    • MiniLAB Observing Centripetal Force
                                                                    • Lab Gravity and Air Resistance
                                                                      • Section 3 The Third Law of Motion
                                                                        • Integrate Career
                                                                        • Visualizing Rocket Motion
                                                                        • Applying Math The Momentum of a Sprinter
                                                                        • Lab The Momentum of Colliding Objects
                                                                        • Science and History Newton and the Plague
                                                                          • Chapter 4 Study Guide
                                                                          • Chapter 4 Review
                                                                          • Chapter 4 Standardized Test Practice
                                                                            • Chapter 5 Energy
                                                                              • Launch Lab Energy Conversions
                                                                              • Foldables
                                                                              • Section 1 The Nature of Energy
                                                                                • Science Online
                                                                                • Applying Math Kinetic Energy
                                                                                • MiniLAB Interpreting Data from a Slingshot
                                                                                • Integrate Language Arts
                                                                                • Applying Math Gravitational Potential Energy
                                                                                • Lab Bouncing Balls
                                                                                  • Section 2 Conservation of Energy
                                                                                    • Visualizing Energy Transformations
                                                                                    • Integrate Environment
                                                                                    • MiniLAB Transforming Energy in a Paper Clip
                                                                                    • Science Online
                                                                                    • Integrate Health
                                                                                    • Lab Design Your Own - Swinging Energy
                                                                                    • Science and History The Impossible Dream
                                                                                      • Chapter 5 Study Guide
                                                                                      • Chapter 5 Review
                                                                                      • Chapter 5 Standardized Test Practice
                                                                                        • Chapter 6 Work and Machines
                                                                                          • Launch Lab Doing Work with a Simple Machine
                                                                                          • Foldables
                                                                                          • Section 1 Work
                                                                                            • Integrate Language Arts
                                                                                            • Applying Math Work
                                                                                            • MiniLAB Calculating Your Work and Power
                                                                                            • Applying Math Power
                                                                                              • Section 2 Using Machines
                                                                                                • MiniLAB Machines Multiplying Force
                                                                                                • Science Online
                                                                                                • Integrate Chemistry
                                                                                                  • Section 3 Simple Machines
                                                                                                    • Integrate History
                                                                                                    • Visualizing Levers in the Human Body
                                                                                                    • Science Online
                                                                                                    • Lab Levers
                                                                                                    • Lab Model and Invent - Using Simple Machines
                                                                                                    • Science and Society The Science of Very Very Small
                                                                                                      • Chapter 6 Study Guide
                                                                                                      • Chapter 6 Review
                                                                                                      • Chapter 6 Standardized Test Practice
                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                          • Launch Lab Relative Sizes of Earth the Moon and the Sun
                                                                                                          • Foldables
                                                                                                          • Section 1 Earth in Space
                                                                                                            • Science Online
                                                                                                            • Integrate Physics
                                                                                                              • Section 2 Time and Seasons
                                                                                                                • MiniLAB Modeling the Suns Rays at Solstice
                                                                                                                • Lab Comparing the Angle of Sunlight to Intensity
                                                                                                                  • Section 3 Earths Moon
                                                                                                                    • Applying Math Tides
                                                                                                                    • MiniLAB Modeling Phases and Eclipses
                                                                                                                    • Integrate History
                                                                                                                    • Integrate History
                                                                                                                    • Science Online
                                                                                                                    • Visualizing Water on the Moon
                                                                                                                    • Lab Identifying the Moons Surface Features and Apollo Landing Sites
                                                                                                                    • Oops Accidents in Science Even Great Scientists Make Mistakes
                                                                                                                      • Chapter 7 Study Guide
                                                                                                                      • Chapter 7 Review
                                                                                                                      • Chapter 7 Standardized Test Practice
                                                                                                                        • Chapter 8 The Solar System
                                                                                                                          • Launch Lab The Size of the Solar System
                                                                                                                          • Foldables
                                                                                                                          • Section 1 Planet Motion
                                                                                                                            • Integrate History
                                                                                                                            • MiniLAB Plotting Retrograde Motion
                                                                                                                            • Integrate Physics
                                                                                                                            • Applying Math Heliocentric Longitude (HL)
                                                                                                                              • Section 2 The Inner Planets
                                                                                                                                • Science Online
                                                                                                                                • Integrate Chemistry
                                                                                                                                • Lab Interpreting Features of Marss Surface
                                                                                                                                  • Section 3 The Outer Planets
                                                                                                                                    • Integrate Language Arts
                                                                                                                                    • Visualizing What Galileo Saw
                                                                                                                                    • Science Online
                                                                                                                                    • MiniLAB Comparing Sizes of Outer and Inner Planets
                                                                                                                                      • Section 4 Life in the Solar System
                                                                                                                                        • Lab Design Your Own - Testing Unknown Soil Samples for Life
                                                                                                                                        • Science Stats Night Sky Wonders
                                                                                                                                          • Chapter 8 Study Guide
                                                                                                                                          • Chapter 8 Review
                                                                                                                                          • Chapter 8 Standardized Test Practice
                                                                                                                                              • Unit 3 Energy in Motion
                                                                                                                                                • Chapter 9 Heat and States of Matter
                                                                                                                                                  • Launch Lab Expansion of a Gas
                                                                                                                                                  • Foldables
                                                                                                                                                  • Section 1 Temperature and Thermal Energy
                                                                                                                                                    • Applying Math Converting to Celsius
                                                                                                                                                    • Science Online
                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                    • Applying Math Change in Thermal Energy
                                                                                                                                                      • Section 2 States of Matter
                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                        • Science Online
                                                                                                                                                        • MiniLAB Comparing States of Water
                                                                                                                                                          • Section 3 Transferring Thermal Energy
                                                                                                                                                            • MiniLAB Comparing Thermal Conductors
                                                                                                                                                            • Visualizing Convection Currents
                                                                                                                                                            • Lab Convection in Gases and Liquids
                                                                                                                                                              • Section 4 Using Thermal Energy
                                                                                                                                                                • Integrate History
                                                                                                                                                                • Science Online
                                                                                                                                                                • Lab Conduction in Gases
                                                                                                                                                                • Science Stats Surprising Thermal Energy
                                                                                                                                                                  • Chapter 9 Study Guide
                                                                                                                                                                  • Chapter 9 Review
                                                                                                                                                                  • Chapter 9 Standardized Test Practice
                                                                                                                                                                    • Chapter 10 Waves
                                                                                                                                                                      • Launch Lab How do waves transfer energy
                                                                                                                                                                      • Foldables
                                                                                                                                                                      • Section 1 The Nature of Waves
                                                                                                                                                                        • Visualizing Formation of Ocean Waves
                                                                                                                                                                        • Science Online
                                                                                                                                                                          • Section 2 Wave Properties
                                                                                                                                                                            • MiniLAB Observing Wavelength
                                                                                                                                                                            • Integrate Social Studies
                                                                                                                                                                            • Applying Math The Speed of Sound
                                                                                                                                                                            • Lab Wave Speed and Tension
                                                                                                                                                                              • Section 3 The Behavior of Waves
                                                                                                                                                                                • Science Online
                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                • MiniLAB Experimenting with Resonance
                                                                                                                                                                                • Lab Measuring Wave Properties
                                                                                                                                                                                • Science and History Making Waves
                                                                                                                                                                                  • Chapter 10 Study Guide
                                                                                                                                                                                  • Chapter 10 Review
                                                                                                                                                                                  • Chapter 10 Standardized Test Practice
                                                                                                                                                                                    • Chapter 11 Sound and Light
                                                                                                                                                                                      • Launch Lab What sound does a ruler make
                                                                                                                                                                                      • Foldables
                                                                                                                                                                                      • Section 1 Sound
                                                                                                                                                                                        • MiniLAB Comparing Intensity
                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                        • Science Online
                                                                                                                                                                                        • Applying Math Using Sonar
                                                                                                                                                                                          • Section 2 Reflection and Refraction of Light
                                                                                                                                                                                          • Section 3 Mirrors Lenses and the Eye
                                                                                                                                                                                            • Visualizing Images Formed by a Convex Lens
                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                            • MiniLAB Experimenting with Focal Lengths
                                                                                                                                                                                            • Lab Reflections of Reflections
                                                                                                                                                                                              • Section 4 Light and Color
                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Lab Design Your Own - Blocking Noise Pollution
                                                                                                                                                                                                • Science and Language Arts A Haiku Garden The Four Seasons in Poems and Print
                                                                                                                                                                                                  • Chapter 11 Study Guide
                                                                                                                                                                                                  • Chapter 11 Review
                                                                                                                                                                                                  • Chapter 11 Standardized Test Practice
                                                                                                                                                                                                    • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                      • Launch Lab Global Jigsaw Puzzle
                                                                                                                                                                                                      • Foldables
                                                                                                                                                                                                      • Section 1 Evolution of Earths Crust
                                                                                                                                                                                                        • Applying Math Spreading Distances
                                                                                                                                                                                                        • Integrate Physics
                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                          • Section 2 Earthquakes
                                                                                                                                                                                                            • MiniLAB Demonstrating Four Types of Stress
                                                                                                                                                                                                            • Visualizing Earthquake-Proof Buildings
                                                                                                                                                                                                              • Section 3 Earths Interior
                                                                                                                                                                                                              • Section 4 Volcanoes
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • MiniLAB Modeling Lava Viscosity
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                • Lab A Case for Pacific Plate Motion
                                                                                                                                                                                                                • Lab Earthquake Earthquake Wheres the earthquake
                                                                                                                                                                                                                • Science and History Volcano Weather
                                                                                                                                                                                                                  • Chapter 12 Study Guide
                                                                                                                                                                                                                  • Chapter 12 Review
                                                                                                                                                                                                                  • Chapter 12 Standardized Test Practice
                                                                                                                                                                                                                      • Unit 4 Forms of Energy
                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                          • Launch Lab Electric Circuits
                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                          • Section 1 Electric Charge
                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                            • Visualizing Lightning
                                                                                                                                                                                                                            • MiniLAB Investigate Charged Objects
                                                                                                                                                                                                                              • Section 2 Electric Current
                                                                                                                                                                                                                                • MiniLAB Investigating Battery Addition
                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                • Lab Identifying Conductors and Insulators
                                                                                                                                                                                                                                  • Section 3 Electrical Energy
                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                    • Applying Math Power Used by a Clothes Dryer
                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                    • Applying Math Electrical Energy Used by a Microwave Oven
                                                                                                                                                                                                                                    • Lab Design Your Own - Comparing Series and Parallel Circuits
                                                                                                                                                                                                                                    • Science and Language Arts Invisible Man
                                                                                                                                                                                                                                      • Chapter 13 Study Guide
                                                                                                                                                                                                                                      • Chapter 13 Review
                                                                                                                                                                                                                                      • Chapter 13 Standardized Test Practice
                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                          • Launch Lab The Strength of Magnets
                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                          • Section 1 Magnetism
                                                                                                                                                                                                                                            • MiniLAB Observing Magnetic Interference
                                                                                                                                                                                                                                            • Integrate Earth Science
                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                            • Applying Science How can magnetic parts of a junk car be salvaged
                                                                                                                                                                                                                                            • MiniLAB Making Your Own Compass
                                                                                                                                                                                                                                              • Section 2 Electricity and Magnetism
                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                  • Section 3 Producing Electric Current
                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                    • Visualizing Motors and Generators
                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                    • Lab Electricity and Magnetism
                                                                                                                                                                                                                                                    • Lab Design Your Own - Controlling Electromagnets
                                                                                                                                                                                                                                                    • Science and History Body Art
                                                                                                                                                                                                                                                      • Chapter 14 Study Guide
                                                                                                                                                                                                                                                      • Chapter 14 Review
                                                                                                                                                                                                                                                      • Chapter 14 Standardized Test Practice
                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                          • Launch Lab Can electromagnetic waves change materials
                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                          • Section 1 What are electromagnetic waves
                                                                                                                                                                                                                                                            • MiniLAB Investigating Electromagnetic Waves
                                                                                                                                                                                                                                                            • Applying Math The Speed of Light in Water
                                                                                                                                                                                                                                                              • Section 2 The Electromagnetic Spectrum
                                                                                                                                                                                                                                                                • MiniLAB Heating with Microwaves
                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                • Lab The Shape of Satellite Dishes
                                                                                                                                                                                                                                                                  • Section 3 Radio Communication
                                                                                                                                                                                                                                                                    • Visualizing Radio Broadcasts
                                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Lab Use the Internet - Radio Frequencies
                                                                                                                                                                                                                                                                    • Science and History Riding a Beam of Light
                                                                                                                                                                                                                                                                      • Chapter 15 Study Guide
                                                                                                                                                                                                                                                                      • Chapter 15 Review
                                                                                                                                                                                                                                                                      • Chapter 15 Standardized Test Practice
                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                          • Launch Lab Heating with Solar Energy
                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                          • Section 1 Fossil Fuels
                                                                                                                                                                                                                                                                            • Visualizing The Formation of Fossil Fuels
                                                                                                                                                                                                                                                                            • MiniLAB Designing an Efficient Water Heater
                                                                                                                                                                                                                                                                              • Section 2 Nuclear Energy
                                                                                                                                                                                                                                                                                • Integrate Earth Science
                                                                                                                                                                                                                                                                                • Integrate Social Science
                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                • Applying Science Can a contaminated radioactive site be reclaimed
                                                                                                                                                                                                                                                                                  • Section 3 Renewable Energy Sources
                                                                                                                                                                                                                                                                                    • MiniLAB Using Solar Power at Home
                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                    • Lab Solar Heating
                                                                                                                                                                                                                                                                                    • Lab Use the Internet How much does energy really cost
                                                                                                                                                                                                                                                                                    • Science and Society Reacting to Nuclear Energy
                                                                                                                                                                                                                                                                                      • Chapter 16 Study Guide
                                                                                                                                                                                                                                                                                      • Chapter 16 Review
                                                                                                                                                                                                                                                                                      • Chapter 16 Standardized Test Practice
                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                          • Lab Atmospheric Pressure
                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                          • Section 1 Earths Atmosphere
                                                                                                                                                                                                                                                                                            • MiniLAB Visualizing Convection
                                                                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                                                                            • Lab Visualizing a Temperature Inversion
                                                                                                                                                                                                                                                                                              • Section 2 Weather
                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Coriolis Effect
                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                  • Section 3 Climate
                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                    • Visualizing Earths Biogeophysical System
                                                                                                                                                                                                                                                                                                      • Section 4 Earths Changing Climates
                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                        • Applying Math Carbon Dioxide (CO2) Concentration
                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Investigating Microclimate
                                                                                                                                                                                                                                                                                                        • Science and Language Arts The Grapes of Wrath
                                                                                                                                                                                                                                                                                                          • Chapter 17 Study Guide
                                                                                                                                                                                                                                                                                                          • Chapter 17 Review
                                                                                                                                                                                                                                                                                                          • Chapter 17 Standardized Test Practice
                                                                                                                                                                                                                                                                                                              • Unit 5 Matter and Earth Materials
                                                                                                                                                                                                                                                                                                                • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                  • Launch Lab Demonstrate the Distillation of Water
                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                  • Section 1 Composition of Matter
                                                                                                                                                                                                                                                                                                                    • Visualizing Elements
                                                                                                                                                                                                                                                                                                                    • MiniLAB Classifying Materials
                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                    • Lab Comparing Pure Substances and Mixtures
                                                                                                                                                                                                                                                                                                                      • Section 2 Properties of Matter
                                                                                                                                                                                                                                                                                                                        • Integrate Environment
                                                                                                                                                                                                                                                                                                                        • MiniLAB Separating Ink
                                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                                        • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                        • Applying Math The Law of Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Measuring the Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Science Stats Intriguing Elements
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Study Guide
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Review
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                            • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                              • Launch Lab Inferring What You Cant Observe
                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                              • Section 1 Structure of the Atom
                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling an Aluminum Atom
                                                                                                                                                                                                                                                                                                                                • Visualizing The Atomic Model
                                                                                                                                                                                                                                                                                                                                  • Section 2 Masses of Atoms
                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                    • Applying Science How can radioactive isotopes help tell time
                                                                                                                                                                                                                                                                                                                                      • Section 3 The Periodic Table
                                                                                                                                                                                                                                                                                                                                        • MiniLAB Organizing a Personal Periodic Table
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Career
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                                                                                                                                                                                                                                                                                                                                        • Science and History A Chilling Story
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Study Guide
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                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Standardized Test Practice
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                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                              • Section 1 Minerals
                                                                                                                                                                                                                                                                                                                                                • MiniLAB Identifying Salts Crystal System
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                                                                                                                                                                                                                                                                                                                                                • Lab Be a Mineral Detective
                                                                                                                                                                                                                                                                                                                                                  • Section 2 Igneous Rocks
                                                                                                                                                                                                                                                                                                                                                    • Applying Math Extrusive Igneous Rock Classification
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                                                                                                                                                                                                                                                                                                                                                      • Section 3 Sedimentary Rocks
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                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Evaporites
                                                                                                                                                                                                                                                                                                                                                          • Section 4 Metamorphic Rocks and the Rock Cycle
                                                                                                                                                                                                                                                                                                                                                            • Integrate Chemistry
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                                                                                                                                                                                                                                                                                                                                                            • Science and Society Earth Materials at Work
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Study Guide
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                                                                                                                                                                                                                                                                                                                                                                • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                  • Launch Lab Have you got the time
                                                                                                                                                                                                                                                                                                                                                                  • Foldables
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                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing a Disappearing Seasoning
                                                                                                                                                                                                                                                                                                                                                                    • Integrate Chemistry
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                                                                                                                                                                                                                                                                                                                                                                      • Section 2 Shaping the Landscape
                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Runoff
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                                                                                                                                                                                                                                                                                                                                                                          • Section 3 Groundwater
                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Porosity Volume
                                                                                                                                                                                                                                                                                                                                                                            • Visualizing The Role of Groundwater in Shaping Earths Surface
                                                                                                                                                                                                                                                                                                                                                                            • Integrate Environment
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                                                                                                                                                                                                                                                                                                                                                                              • Section 4 Geologic Time
                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
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                                                                                                                                                                                                                                                                                                                                                                                • Lab Its about time - relative that is
                                                                                                                                                                                                                                                                                                                                                                                • Science and Society Tapping into the Underground
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Study Guide
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                                                                                                                                                                                                                                                                                                                                                                                      • Unit 6 Interactions of Matter
                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                          • Lab Chemical Bonds and Mixing
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                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Stability in Bonding
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                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Types of Bonds
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                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Observing a Bond Type
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                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Writing Formulas and Naming Compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
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                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Study Guide
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                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Chemical Changes
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                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Chemical Equations
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                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Classifying Chemical Reactions
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                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
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                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
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                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Study Guide
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                                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab Magic Solutions
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                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Solubility and Concentration
                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
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                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing Acid Relief
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Page 10: 706 S1 318-326 GPS09 - Light-and-Sound - home · PDF fileWhat sound does a ruler make? ... sound waves cannot travel in empty space where there are no particles. ... sound travels

Opaque

Translucent

Transparent

SECTION 2 Reflection and Refraction of Light 327

The Interaction of Light and MatterLook around your darkened room at night You know that

some of the objects are brightly colored but they look gray orblack in the dim light Turn on the light and you can see all theobjects in the room clearly including their colors What you seedepends on the amount of light in the room and the color of theobjects For you to see an object it must reflect or emit somelight that reaches your eyes

Absorption Transmission and Reflection Objects canabsorb light reflect light and transmit lightmdashallow light to passthrough them The type of matter in an object determines theamount of light it absorbs reflects and transmits For examplethe opaque material in the top candleholder in Figure 8 onlyabsorbs and reflects lightmdashno light passes through it As a resultyou cannot see the candle inside Materials that allow some lightto pass through them like the material of the middle candle-holder in Figure 8 are described as translucent You cannot seeclearly through translucent materials

Transparent materials such as the bottom candleholder inFigure 8 transmit almost all the light striking them so you cansee objects clearly through them Only a small amount of lightis absorbed and reflected by transparent materials

Reflection andRefraction of Light

Reading Guide

Describe how light waves interact

with matter Explain the difference between

regular and diffuse reflection Define the index of refraction of a

material Explain why a prism separates

white light into different colors

The images you see every day are

due to the behavior of light waves

Review Vocabulary

visible light an electromagnetic

wave with wavelengths between

about 400 and 700 billionths of a

meter

New Vocabulary

bull opaque

bull translucent

bull transparent

bull index of refraction

Figure 8 These candleholders

interact with light differently

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328 CHAPTER 11 Sound and Light

Reflection of LightHave you glanced in a mir-

ror today You see your reflec-tion in the mirror when light isreflected off you strikes themirror and is reflected off themirror into your eye Becauselight behaves as a wave itobeys the law of reflection asshown in Figure 9 Recall thataccording to the law of reflec-tion the angle at which a lightwave strikes a surface is thesame as the angle at which it is

reflected Light reflected from any surfacemdasha mirror or a sheetof papermdashobeys this law

Regular and Diffuse Reflection Why can you see yourreflection in a store window but not in a sheet of paper Theanswer has to do with the smoothness of the surfaces A smootheven surface such as a pane of glass produces a sharp image byreflecting parallel light waves in only one direction Reflection oflight waves from a smooth surface is regular reflection To causea regular reflection the roughness of a surface must be less thanthe wavelengths it reflects A sheet of paper has an uneven sur-face that causes incoming parallel light waves to be reflected inmany directions as shown in Figure 10 Reflection of light froma rough surface is diffuse reflection

Scattering Diffuse reflection is a type of scattering thatoccurs when light waves traveling in one direction are made totravel in many different directions Scattering also occurs whenlight waves traveling through the air reflect off small particlesAn example is light scattering off the small water droplets thatmake up a cloud Scattering causes the cloud to appear whiteeven though the droplets are transparent

What is scattering of light

Figure 9 According to the law of

reflection light is reflected so that

the angle of incidence always

equals the angle of reflection

Figure 10 A sheet of paper

has an uneven surface that

produces a diffuse reflection

Explain Use the law ofreflection to explain why arough surface causes parallellight waves to be reflected inmany directions

Mirror

i = angle of

incidence

i

r

i

r

r = angle of

reflection

Normal

Normal

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Refraction of LightWhat occurs when a light wave passes from one material to

anothermdashfrom air to water for example Recall that refractionis caused by a change in the speed of a wave when it passes fromone material to another If the light wave is traveling at an angleto the boundary between the materials and the speed of light isdifferent in the two materials the wave will be bent or refracted

Why does refraction occur

The Index of Refraction The amount of bending that takesplace depends on the speeds of light in both materials Thegreater the change in speed the more the light will be bent asit passes at an angle from one material to the other Figure 11

shows an example of refraction Every material has an index ofrefraction which is the ratio of the speed of light in a vacuum tothe speed of light in the material The index of refraction indi-cates how much the speed of light is reduced in the materialcompared to its speed in empty space

The larger the index of refraction the more light is sloweddown in the material For example because glass has a largerindex of refraction than air light moves more slowly in glassthan air The index of refraction is usually largest for solids andsmallest for gases

Prisms A sparkling glass prism hangs in a sunny windowrefracting the sunlight and projecting a colorful pattern onto thewalls of the room How does the refraction of light create thesecolors The spectrum of colors is produced because the speed oflight in a material also depends on the wave-length of the light In a glass prism light waveswith longer wavelengths such as red light wavesare slowed less than light waves with shorterwavelengths such as blue light waves

Figure 12 shows what occurs when whitelight passes through a prism White light suchas sunlight is made up of light waves withrange of wavelengths from red to blue The tri-angular prism refracts the light twicemdashoncewhen it enters the prism and again when itleaves the prism and reenters the air Becausethe longer wavelengths of light are slowed lessthan the shorter wavelengths are red light isbent the least As a result of these differentamounts of bending the different colors areseparated when they emerge from the prism

Figure 11 The spoon looks

broken because light waves are

refracted as they change speed

when they pass from the water to

the air

329

Figure 12 Refraction causes a

prism to separate a beam of white

light into different colors

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330 CHAPTER 11 Sound and Light

Self Check

1 Compare and contrast opaque transparent and

translucent materials Give one example of each

2 Discuss why you can see your reflection in a smooth

piece of aluminum foil but not in a crumpled ball of foil

3 Infer what happens to light waves that are reflected off

dust particles in the air

4 Explain what happens to white light when it passes

through a prism

5 Think Critically Suppose a material has the same index

of refraction as water How would a light wave change

direction as it traveled from water into this material

Summary

Light and Matter

bull The amount of light that is absorbed

reflected or transmitted depends on the

material making up the object

Reflection of Light

bull Light waves always obey the law of reflection

the angle of incidence equals the angle of

reflection

bull Regular reflection causes parallel light waves

to be reflected in only one direction

bull Diffuse reflection causes parallel light waves

to be reflected in many directions

bull Scattering occurs when light waves are reflected

and travel in many different directions

Refraction of Light

bull Refraction occurs when a light wave changes

speed in moving from one material to another

bull The index of refraction of a material indicates

how much light slows down in the material

6 Find an Angle A light wave strikes a mirror at an

angle of 42deg from the surface of the mirror What

angle does the reflected wave make with the normal

7 Find an Angle A light wave reflects from a mirror at

27deg from the normal What was the angle between

the mirror and the incident wave

Mirages When yoursquore traveling in a car you might see whatlooks like a pool of water on the road ahead As you get closerthe water seems to disappear Yoursquove seen a miragemdashan image ofa distant object produced by the refraction of light through airlayers of different densities Mirages result when the air atground level is much warmer or cooler than the air above asshown in Figure 13 The density of air increases as air cools andlight waves move slower in cooler air than in warmer air As aresult light waves are refracted as they pass through air layerswith different temperatures

Figure 13 Mirages result when

air near the ground is much

warmer or cooler than the air

above This causes light waves

reflected from an object to refract

creating one or more additional

images

MirageWarm air

Cool air

More Section Review gpesciencecom

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SECTION 3 Mirrors Lenses and the Eye 331

Light RaysLight sources send out light waves in all directions These

waves spread out like ripples on the surface of water spread outfrom the point of impact of a pebble You can think of the lightcoming from the source as being many narrow beams of light trav-eling in all directions Each narrow light beam is called a light ray

MirrorsA mirror is any surface that produces a regular reflection A pool

of still water a metal pan and even the back of a shiny spoon can bemirrors Mirrors can be flat curved inward or curved outward

Plane Mirrors A flat smooth mirror is a plane mirror Whenyou look in a plane mirror your image appears upright If youstand 1 m from the mirror your image appears 1 m behind themirror or 2 m from you In fact your image is what a friend stand-ing 2 m from you would see Figure 14 shows how your image isformed First light rays from a light source strike you Every pointthat is struck by the light rays reflects these rays so they travel out-ward in all directions If your friend were looking at you thesereflected light rays coming from you would enter her eyes so shecould see you However if a mirror is placed between you and yourfriend light rays are reflected from the mirror back to your eyes

Mirrors Lenses andthe Eye

Reading Guide

Describe how images are formed

by three types of mirrors Explain how convex and concave

lenses form images Explain how the human eye

enables you to see Describe how lenses are used to

correct vision problems

Mirrors and lenses are used in optical

instruments such as cameras and

telescopes

Review Vocabulary

reflection the process of changing

direction after striking a surface

New Vocabulary

bull plane mirror

bull concave mirror

bull convex mirror

bull convex lens

bull concave lens

Figure 14 Seeing an image of

yourself in a mirror involves two

sets of reflections light rays are

reflected from you and then are

reflected by the mirror

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332 CHAPTER 11 Sound and Light

Virtual and Real Images The forma-tion of an image by a plane mirror isshown in Figure 15 Your brain assumesthat light rays travel in a straight line As aresult rays that enter your eyes seem tocome from behind the mirror This makesthe image seem to be behind the mirrorHowever no light rays actually passthrough the place where the image seemsto be located This type of image is called avirtual image Plane mirrors always formvirtual images If light rays from an objectpass through the location of the image theimage is called a real image Curved mir-rors can form both real and virtual images

Concave Mirrors If the surface of a mirror is curved inwardit is called a concave mirror as shown in Figure 16 The opticalaxis is an imaginary straight line drawn perpendicular to thesurface of the mirror at its center Every light ray traveling par-allel to the optical axis is reflected through a point on the opti-cal axis called the focal point The distance from the center ofthe mirror to the focal point is called the focal length

The image formed by a concave mirror depends on the loca-tion of the object relative to the focal point Figure 16 shows acandle located more than twice the focal length from the mirrorAlthough many light rays come from each point on the candleonly two rays from the same point are shown Ray A passesthrough the focal point and then reflects off the mirror movingparallel to the optical axis Ray B travels parallel to the opticalaxis before reflecting off the mirror and passing through thefocal point The point where the two rays meet is the location ofthe image of the original point on the candle The image formedis a real image because light rays from the candle pass throughthe place where the image is located

Figure 16 Rays A and B start from the same

place on the candle travel in different directions

and meet again on the reflected image

Diagram how two other points on the image ofthe candle are formed

Figure 15 Your brain interprets

the light rays reflected by the

mirror as coming from a point

behind the mirror

Infer how the size of your imagein a plane mirror depends on yourdistance from the mirror

Focalpoint

Optical axis

Ray B

Ray A

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SECTION 3 Mirrors Lenses and the Eye 333

Images Produced by a ConcaveMirror When an object is between oneand two focal lengths from a concavemirror the image is real inverted andlarger than the object An object closerthan one focal length from a concavemirror produces a virtual image that isupright and larger than the object Noimage is produced if the object islocated at the focal point

Convex Mirrors When you are in astore look up toward one of the backcorners or at the end of an aisle to see ifa large rounded mirror is mountedthere You can see a large area of the store in such a mirror Amirror that curves outward like the back of a spoon is called aconvex mirror Light rays that hit a convex mirror diverge orspread apart after they are reflected Figure 17 shows how therays from an object are reflected by a convex mirror to form animage The reflected rays diverge and never meet so a convexmirror forms only a virtual image The image also is upright andsmaller than the actual object is

Describe the image formed by a convex mirror

LensesWhat do your eyes have in common with cameras eyeglasses

and microscopes Each of these contains at least one lens A lens is atransparent object with at least one curved surface that causes lightrays to refract The image that a lens forms depends on the shape ofthe lens Like curved mirrors lenses can be convex or concave

Convex Lenses A convex lens is thicker in the middle than atthe edges Its optical axis is an imaginary straight line that is per-pendicular to the surface of the lens at its thickest point When lightrays approach a convex lens traveling parallel to its opticalaxis the rays are refracted toward the center of the lens asin Figure 18 Light rays traveling along the optical axis arenot bent at all All light rays traveling parallel to the opti-cal axis are refracted so they pass through a single pointwhich is the focal point of the lens The less curved thesides of the lens the less light rays are bent As a resultlenses with flatter sides have longer focal lengths Figure 19

on the next page shows that convex lenses can form eitherreal or virtual images

Figure 18 Convex lenses are

thicker in the middle than at the

edges Light rays that are parallel

to the optical axis are refracted so

that they pass through the focal

point A light ray that passes

through the center of the lens is

not refracted

Figure 17 A convex mirror

forms a reduced upright virtual

image

Optical axis

Ray A

Ray B

Focallength

Focalpoint

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Figure 19

VISUALIZING IMAGES FORMED BY A CONVEX LENS

334 CHAPTER 11 Sound and Light

Aconvex lens can form images that are real or virtual enlarged or reduced and upright orinverted Just as for a concave mirror the type of image formed by a convex lens depends on thelocation of the object relative to the focal point of the lens

Optical axis

One

focal

length

Two

focal

lengthsRay B

Image

Ray A

Object

Focal

point

Optical axis

One

focal

length

Two

focal

lengths

Ray B

Ray AObject

Image

Focal

point

Optical axis

Ray B

ObjectRay A

One

focal

length

Focal

pointImage

If the object is more than two focal lengths from the lens the image formed is real inverted andsmaller than the object As the object moves farther from the lens the image becomes smaller

If the object is between one and two focal lengths from the lens the image formed is real invertedand larger than the object As the object moves closer to the focal point the image becomes larger

If the object is less than one focal length from the lens the image is virtual upright and larger thanthe object The image is virtual because the light rays from the object diverge after they pass throughthe lens The image becomes smaller as the object moves closer to the lens

SECTION 3 Mirrors Lenses and the Eye 335

Concave Lenses A concave lens is thinnerin the middle and thicker at the edges Asshown in Figure 20 light rays that passthrough a concave lens bend away from theoptical axis The rays spread out and nevermeet so a real image is never formed Theimage is always virtual upright and smallerthan the object is Concave lenses are used insome types of eyeglasses and some telescopesConcave lenses usually are used in combinationwith other lenses

What type of image is formed by a concave lens

The Human EyeWhat determines how well you can see the words on this

page If you donrsquot need eyeglasses the structure of your eye givesyou the ability to focus on these words and other objects aroundyou Look at Figure 21 Light enters your eye through a trans-parent covering on your eyeball called the cornea The corneacauses light rays to bend so that they converge The light thenpasses through an opening called the pupil Behind the pupil isa flexible convex lens Muscles attached to the lens change itsshape to help focus light forming a sharp image on your retina

The retina is the inner lining of your eye The retina con-tains light-sensitive cells that convert an image into electricalsignals These signals then are carried along the optic nerve toyour brain to be interpreted With this complex structurethe human eye is capable of seeing clearly in bright and dimconditions focusing on both near and far objects and alsodetecting colors

Figure 20 A concave lens

refracts light rays so they spread

out away from the optical axis

Classify Is a concave lens mostlike a concave mirror or a convexmirror

Optical axis

Retina

Focalpoint

Pupil

Cornea

Lens

Optic nerve

Figure 21 The cornea and lens in your eye

bend light rays so that a sharp image is

formed on the retina

Eye Doctors Optometristsand ophthalmologists treatmany different eye prob-lems They often useadvanced technology todiagnose and correct mal-functioning parts of theeye Research an eye prob-lem and how it is treatedWrite a paragraph describ-ing what parts of the eyeare affected by the problemand how doctors correct it

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336 CHAPTER 11 Sound and Light

Brightness and Intensity The human eye can adjust to thebrightness of the light that strikes it If you step outside on asunny day you may have to shade your eyes against the intensityof the sunlight Light intensity is the amount of light energy thatstrikes a certain area each second Brightness is the human per-ception of light intensity Sunlight seems bright because a largeamount of light energy strikes your retina each second Youreyes respond to bright light by decreasing the size of your pupilThis reduces the amount of light that enters your eye and strikesthe retina

Intensity depends on your distance from a light source Ifyou move away from a bare lightbulb you can see how theintensity of the light rapidly decreases Because light rays spreadout from the source less light energy strikes your retina thefarther away you are from the bulb

Correcting Vision ProblemsIf you have good vision you should be able to see objects

clearly when they are 25 cm or farther away from your eyes Asharp image of an object should be formed on your retinaHowever for many people the image is blurry or formed in thewrong place causing vision problems

Farsightedness If you can see distant objects clearly butcanrsquot bring nearby objects into focus then you are farsighted Inthis case the eyeball might be too short or the lens isnrsquot curvedenough to form a sharp image of nearby objects on the retinaas shown in Figure 22 To correct the problem convex lensescan be used to bend incoming light rays so they converge beforethey enter the eye

Experimenting withFocal LengthsProcedure1 Complete the safety form

2 Fill a glass test tube with

water and seal it with a

lid or stopper3 Type or print SULFUR

DIOXIDE in capital letters

on a piece of paper4 Set the test tube horizon-

tally over the words

Record your observations

5 Hold the tube at several

heights above the words

Record your observations

Analysis1 Describe how the words

changed as the height of

the test tube increased

2 Classify the image at each

height as real or virtual

Focal

point

Correctedfarsighted eye

Light fromnearby object

Focalpoint

Light fromnearby object

Farsighted eye

The focal length of a farsighted eye is too long to form

a sharp image of nearby objects on the retina

A convex lens in front of a farsighted eye enables a sharp

image of nearby objects to be formed on the retina

Figure 22 Farsightedness can

be corrected by convex lenses

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SECTION 3 Mirrors Lenses and the Eye 337

Self Check

1 Diagram how light rays from an object are reflected by

a convex mirror to form an image

2 Infer how the size of the image changes if an object

that is less than one focal length from a concave mirror

moves closer to the mirror

3 Explain how the focal length of a convex lens changes

as the sides of the lens become less curved

4 Compare the image of an object less than one focal

length from a convex lens with the image of an object

more than two focal lengths from the lens

5 Think Critically Describe the image formed by a light

source placed at the focal point of a convex lens

Summary

Mirrors

bull A plane mirror forms upright virtual images

bull The image formed by a concave mirror

depends on the location of the object relative

to the focal point

bull Convex mirrors always produce virtual upright

images that are smaller than the object

Lenses

bull The image formed by a convex lens depends

on the distance of the object from the lens

bull Concave lenses always form virtual upright

images that are smaller than the object

The Eye and Vision

bull The eye contains a lens that changes shape to

produce sharp images on the retina

bull Farsightedness occurs when the eye cannot

form a sharp image of nearby objects

Nearsightedness occurs when the eye cannot

form sharp images of distant objects

6 Calculate Object Distance If you looked through a

convex lens with a focal length of 15 cm and saw a

real inverted enlarged image what is the maximum

distance between the lens and the object

Nearsightedness If you have nearsighted friends you knowthat they can see only nearby objects clearly Their eyes cannotform a sharp image on the retina of an object that is far awayInstead the image is formed in front of the retina as shown inFigure 23 To correct this problem a nearsighted person canwear concave lenses Figure 23 shows how a concave lens causesincoming light rays from distant objects to diverge before theyreach the eye Then the rays can be focused by the eye to form asharp image on the retina

Figure 23 Nearsightedness can

be corrected with concave lenses

Focalpoint

Light fromdistant object

Nearsighted eye

Focalpoint

Light fromdistant object

Correctednearsighted eye

When a nearsighted person looks at distant objects a

sharp image is formed in front of the retina

A concave lens in front of a nearsighted eye makes light

rays diverge so a sharp image is formed on the retina

More Section Review gpesciencecom

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How can you see the back of your head You

can use two mirrors to view a reflection of a

reflection of the back of your head

Real-World ProblemHow many images are seen in two mirrors

Goal Infer how the number of images depends

on the angle between two mirrors

Materialsplane mirrors (2) protractor

masking tape paper clip

Safety Precautions

Handle glass mirrors and paper clips carefully

Procedure1 Complete the safety form

2 Lay one mirror on top of the other with the

mirror surfaces together Tape together one

side so they can open and close Use tape to

label them L and R for left and right

3 Open the mirrors and stand them on a sheet

of paper at an angle of 72deg

4 Bend one leg of a paper clip up 90deg and

place it close to the front of the R mirror

5 Count the number of images of the paper

clip you see in the R and L mirrors Record

these numbers in your data table

6 The mirrors create an image of a circle

divided into wedges Record the number

of wedges

7 Hold the R mirror still and slowly move the Lmirror to 90deg Record the numbers of images

of the clip and wedges in the circle Repeat

this time opening the mirrors to 120deg

Conclude and Apply1 Infer the relationship between the number

of wedges and paper clip images

2 Determine the angle that would divide a

circle into six wedges Hypothesize how

many images would be produced Test your

hypothesis

Reflections of Reflections

Demonstrate for younger students the

relationship between the angle of the

mirrors and the number of reflections

338 CHAPTER 11 Sound and Light

Angle

Number of Number

of Mirrors Paper Clip Images

of Wedges R L

72ordm

90ordm

120ordm

Images and Wedges Seen in the Mirrors

Do not write in this book

SECTION 4 Light and Color 339

Why Objects Have ColorWhy do some apples appear red while others look green or

yellow An objectrsquos color depends on the wavelengths of light itreflects Recall that white light is a blend of all colors of visiblelight When a red apple is struck by white light it reflects redlight back to your eyes and absorbs all of the other colorsFigure 24 shows white light striking a green leaf Only the wave-lengths corresponding to green light are reflected to your eyes

Although some objects appear to be black black isnrsquot acolor Black is the absence of visible light Objects that appearblack absorb all colors of light and reflect little or no light backto your eyes White objects appear to be white because theyreflect all colors of visible light

Why does a white object appear white

Colored Filters Wearing tinted glasses changesthe color of almost everything you see If the lensesare yellow the world takes on a golden glow If theyare rose colored everything looks rosy Somethingsimilar would occur if you placed a colored clearplastic sheet over this white page The paper wouldappear to be the same color as the plastic The plasticsheet and the tinted lenses are filters A filter is atransparent material that transmits one or more col-ors of light but absorbs all others The color of a fil-ter is the color of the light that it transmits

Light and Color

Reading Guide

Explain how you see color Describe the difference between

light color and pigment color Predict what happens when dif-

ferent colors are mixed

From traffic lights to great works of

art color is an important part of your

world

Review Vocabulary

retina inner layer of the eye con-

taining cells that convert light

images into electrical signals

New Vocabulary

bull pigment

Figure 24 This leaf absorbs all

wavelengths of visible light except

the wavelengths you see as green

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340 CHAPTER 11 Sound and Light

Looking Through Colored Filters Figure 25 shows howthe color of an object can change when you look at it throughvarious colored filters The cooler looks blue under white lightbecause it reflects only the wavelengths of blue light that strikeit If you look at the cooler through a blue filter the cooler stilllooks blue because the blue filter transmits the reflected bluelight However if you look at the cooler through a red filter thecooler seems black because the red filter blocks the blue lightreflected by the cooler

Why does a blue object appear black whenviewed through a red filter

Seeing ColorAs you approach a busy intersection the color of the traffic

light changes from green to yellow to red On the cross street thecolor changes from red to green At a busy intersection trafficsafety depends on your ability to detect color changes rapidlyHow do you see colors

Light and the Eye In a healthy eye light enters the eyethrough the cornea is focused by the lens and finally forms animage on the retina The retina is made up of two types of cellsthat absorb light as shown in Figure 26 When these cellsabsorb light energy chemical reactions convert light energy intonerve impulses that are transmitted to the brain One type ofcell in the retina called a cone enables you to distinguish colorsand detailed shapes of objects Cones need bright light to gener-ate nerve impulses so they do not operate in dim light As aresult even brightly colored objects might look gray or black indim light

Figure 25 The color of this

cooler changes when viewed

through different color filters

Topic Color BlindnessVisit for Web

links to information about the

causes of color blindness

Activity Research the causes

and types of color blindness Find

out how cones are related to the

ability to distinguish colors

gpesciencecom

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SECTION 4 Light and Color 341

Cones and Rods Your eyes have three types of cones each ofwhich responds to a different range of wavelengths Red conesrespond to mostly red and yellow light Green cones respond tomostly yellow and green light Blue cones respond to mostlyblue and violet light The second type of cell in the retina calleda rod is sensitive to dim light and enables you to see at nightHowever rod cells do not enable you to see colors

Interpreting Color Why does a bananalook yellow The light reflected by the

banana causes the cone cells that are sensitive to red and greenlight to send signals to your brain Your brain could get the samesignal if a mixture of red light and green light reached your eyesThis mixture also would cause your red and green cones torespond and you would see the color yellow As a result lightwith wavelengths corresponding to yellow light and light that isa mixture of red and green light both cause the color yellow tobe seen What happens when you look at a white shirt You seewhite when all wavelengths of visible light enters your eyes Thenall three sets of cones cells send signals to the brain The com-bination of these signals cause you to see the shirt as white

Color Blindness If one or more of your sets of cone cellsdo not function properly you might not be able to distinguishcertain colors This condition is called color blindness orcolor deficiency About eight percent of men and one-halfpercent of women have some form of color blindness Themost common form of color blindness makes it difficult todistinguish between red and green Figure 27 shows an imagethat is used in a test for redndashgreen color blindness Becausered and green are used in traffic signals drivers and pedestri-ans must be able to identify them

Retina

Rod

Cone

Lens

Figure 27 Color blindness is an

inherited sex-linked condition in

which certain sets of cones in the

retina do not function properly

Identify the number that you seein the dots

Figure 26 Light enters the eye

and focuses on the retina The two

types of light-detecting cells

that make up the retina

are called rods and cones

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342 CHAPTER 11 Sound and Light

Mixing ColorsIf you have ever browsed through a paint store you have

probably seen displays where customers can select paint samplesof almost every imaginable color The colors are a result of mix-tures of pigments For example you might have mixed blue andyellow paint to produce green paint A pigment is a coloredmaterial that is used to change the color of other substancesThe color of a pigment results from the different wavelengths oflight that the pigment reflects

Mixing Colored Lights From the glowing orange of a sun-set to the deep blue of a mountain lake all the colors you see canbe made by mixing three colors of light These three colorsmdashred green and bluemdashare the primary colors of light They cor-respond to the three different types of cones in the retina ofyour eye When mixed together in equal amounts they producewhite light as Figure 28 shows Mixing the primary colors indifferent proportions can produce the colors you see

What are the primary colors of light

Paint Pigments If you were to mix equal amounts of redgreen and blue paint would you get white paint If mixing col-ors of paint were like mixing colors of light you would but mix-ing paint is different Paints are made with pigments Pigmentsproduce color as a result of the wavelengths of light they reflectPaint pigments usually are made of chemical compounds suchas titanium oxide a bright white pigment and lead chromatewhich is used for painting yellow lines on highways

Figure 28 White light is pro-

duced when the three primary col-

ors of light are mixed in equal

amounts

Color for PhotosynthesisPlant pigments determinethe wavelengths oflight for photosynthesisLeaves usually look greenbecause of the pigmentchlorophyll Chlorophyllabsorbs most wave-lengths of visible lightexcept green which itreflects However not allplants are green Researchdifferent plant pigmentsto find out how they allowplant species to survive indiverse habitats

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SECTION 4 Light and Color 343

Self Check

1 Identity what colors are reflected and what colors are

absorbed if a white light shines on a red shirt

2 Discuss how the primary colors of light differ from the

primary pigment colors

3 Explain why a red apple would appear black if you

looked at it through a blue filter

4 Determine why a white fence appears to be white instead

of multicolored if all colors are present in white light

5 Think Critically Light reflected from an object passes

through a green filter then a red filter and finally a

blue filter What color will the object seem to be

Summary

Why Objects Have Color

bull The color of an object is determined by the

wavelengths of light it reflects

bull The color of a filter is the color of the light the

filter transmits

Seeing Color

bull Rod and cone cells are light-sensitive cells

found in the retina of the human eye

bull Rod cells are sensitive to dim light Cone cells

enable colors to be seen

bull There are three types of cone cells One type

responds to red light another to green light

and another to blue light

Mixing Colors

bull Red green and blue are the primary light

colors Any color of light can be created by

mixing these primary light colors

bull Any pigment color can be formed by mixing

the primary pigment colorsmdashmagenta cyan

and yellow

6 Use Percentages In the human eye there are about

120000000 rods If 90000000 rods trigger at once

what percentage of the total number of rods triggered

7 Convert Units The wavelengths of light are measured

in nanometers (nm) which equals 0000001 mm

Find the wavelength in mm of a light wave that has a

wavelength of 690 nm

Mixing Pigments You can make any pigment color by mixingdifferent amounts of the three primary pigmentsmdashmagenta(bluish red) cyan (greenish blue) and yellow In fact color print-ers use these pigments as well as black ink to make full-colorprints like the pages in this book A primary pigmentrsquos colordepends on the wavelengths of the light that it reflects Actuallypigments both absorb and reflect a range of colors in sending asingle color message to your eye For example in white lightyellow pigment appears yellow because it reflects red and greenlight but absorbs the other wavelengths of visible light The colorof a mixture of two primary pigments is determined by theprimary colors of light that both pigments reflect

Look at Figure 29 The area in the center where the colors alloverlap appears to be black because the three blended primarypigments absorb all the primary colors of light Recall that theprimary colors of light combine to produce white light They arecalled additive colors However when the primary pigment col-ors are combined they absorb all wavelengths of visible light andproduce black Because black results from the absence ofreflected light the primary pigments are called subtractive colors

Figure 29 The three primary

pigment colors appear to be black

when they are mixed

Describe how the primary pigmentcolors are similar to the primary col-ors of light

More Section Review gpesciencecom

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Design Your OwnDesign Your Own

344

Real-World ProblemWhat loud noises do you enjoy and which ones do you find annoying

Most people enjoy a music concert performed by their favorite artist or

the booming displays of fireworks on the Fourth of July Most people

enjoy these loud sounds for short periods of time However certain

other loud noises such as traffic sirens and loud talking can be

annoying Constant annoying noises are called noise pollution What

can be done to reduce noise pollution What types of barriers will best

block out noise pollution

Form a HypothesisBased on your experiences with loud noises form a hypothesis that

predicts the effectiveness of different types of barriers at blocking out

noise pollution

Test Your HypothesisMake a Plan

1 Complete the safety form

2 Decide what type of barriers or materials you will test

3 Describe exactly how you will use these materials

Goals Design an experiment

that tests the effective-

ness of various types of

barriers and materials

for blocking out noise

pollution

Test different types of

materials and barriers

to determine the best

noise blocks

Possible Materialsradio CD player horn

drum or other loud

noise source

shrubs trees concrete

walls brick walls stone

walls wooden fences

parked cars or hanging

laundry

sound meter

meterstick or metric tape

measure

Blocking NfisePollution

4 Identify the controls and variables you will use in your

experiment

5 List the steps you will use and describe each step precisely

6 Prepare a data table in your Science Journal to record your

measurements

7 Organize the steps of your experiment in logical order

Follow Your Plan

1 Ask your teacher to approve your plan and data table before

you start

2 Conduct your experiment as planned

3 Test each barrier two or three times

4 Record the results from each test in your data table in your Science Journal

Analyze Your Data1 Identify the barriers that most effectively reduced noise pollution

2 Identify the barriers that least effectively reduced noise pollution

3 Compare the effective barriers and identify common characteristics that might

explain why they reduced noise pollution

4 Compare the natural barriers you tested with the artificial barriers Which type

of barrier best reduced noise pollution

5 Compare the different types of materials the barriers were made of Which

type of material best reduced noise pollution

Conclude and Apply1 Evaluate whether your results support your hypothesis

2 Predict how your results would differ if you used a louder source of noise such

as a siren

3 Infer from your results how people living near a

busy street could reduce noise pollution

4 Identify major sources of noise pollution in or

near your home How could they be reduced

5 Research how noise pollution can be

unhealthy

LAB 345

Draw a poster illustrating how builders and

landscapers could use certain materials to

better insulate a home or office from excess

noise pollution

346 CHAPTER 11 Sound and Light

A Haiku GardenThe Four Seasons in Poems and Prints

by Stephen Addiss with Fumiko and Akira Yamamoto

Respond to the Reading1 How do the illustrations help the reader

better understand the poems2 What do you think is meant by the

word lingering in the Haiku about springsunlight

3 Linking Science and Writing Writeone haiku about summer and anotherabout fall In one poem use color tohelp you describe the season In theother use light or some property oflight to help describe the season

Research has deter-mined that there is a

connection between color and mood Warmcolors have longer wavelengths and can bemore stimulating Cool colors which haveshorter wavelengths tend to have a calmingor soothing effect on people Light and colorhave long been used as literary symbols Doesthe use of color change what you imaginewhen you read the haiku

UnderstandingLiteratureJapanese Haiku A haiku is a verse thatconsists of three lines and 17 syllables inthe Japanese language The first and thirdlines have five syllables each and themiddle line has seven syllables Why isimagination important in reading haiku

Lingering

in every pool of watermdash

spring sunlightIssa

Withered by winter

the sound of the windmdash

one-color worldBasho

Sound

1 Sound waves are compressional waves thattravel only in matter

2 The speed of sound in a material dependson the type of material as well as itstemperature

3 Loudness depends on a sound waversquos inten-sity Pitch depends on a sound waversquosfrequency

4 Sound waves are used in echolocationsonar and medical imaging

Reflection and Refractionof Light

1 Light can be absorbed reflected or trans-mitted by a material

2 When light waves are reflected theyobey the law of reflectionmdashthe angle ofincidence equals the angle of reflection

3 A light wave is refracted or bent whenit changes speed as it travels at an anglefrom one material to another

Mirrors Lenses andthe Eye

1 Plane mirrors form upright virtual images

2 Images formed by concave mirrors andconvex lenses depend on the location ofthe object relative to the focal point

3 Convex mirrors and concave lenses formvirtual upright images that are smallerthan the object

4 The lens in the human eye changes shape toproduce a sharp image on the retina

Light and Color

1 You see color when light is reflected offobjects and into your eyes

2 Cone cells in the retina are light-sensitivecells that enable you to distinguish colors

3 Red blue and green are the three primarycolors of light and can be mixed to form allother colors

4 The primary pigment colors are magentacyan and yellow

CHAPTER STUDY GUIDE 347

Use the Foldable you made at the beginningof the chapter to help you review sound and light

Interactive Tutor gpesciencecom

Complete each statement with the correctvocabulary word or phrase

1 A change in frequency due to a movingsound source is due to the

2 A flat smooth surface that reflects light andforms an image is a(n)

3 An object is if you can seethrough it clearly

4 The of a material indicates howmuch the speed of light in the materialchanges as light passes through

5 You can change the color of white paint byadding a(n) to it

6 A(n) is a reflecting surface thatcurves outward like the back of a spoon

7 The human perception of the intensity of asound wave is

Choose the word or phrase that best answerseach question

8 Which of the following best describes imageformation by a plane mirrorA) A real image is formed in front of the mirrorB) A real image is formed behind the mirrorC) A virtual image is formed in front of the

mirrorD) A virtual image is formed behind the mirror

9 For a sound with low pitch what else isalso always lowA) amplitude C) wavelengthB) frequency D) wave velocity

10 Which of the following occurs when asound source moves away from youA) The soundrsquos velocity decreasesB) The soundrsquos loudness increasesC) The soundrsquos frequency decreasesD) The soundrsquos frequency increases

Use the table below to answer question 11

11 Based on the data in the table abovewhich of the following would be the speedof sound in air at 30degCA) 3404 ms C) 3494 msB) 3464 ms D) 3534 ms

12 What happens to a light ray travelingparallel to the optical axis of a convexlens that passes through the lensA) It travels parallel to the optical axisB) It passes through the focal pointC) It is bent away from the optical axisD) It forms a virtual image

13 Light waves of which color are bent mostwhen passing through a prismA) blue C) violetB) red D) yellow

14 Which way does a concave lens bend lightA) toward its optical axisB) toward its centerC) toward its edgesD) toward its focal point

Speed of Sound in Air

Temp peed( s)

4

4

4

348 CHAPTER REVIEW

concave lens p 335concave mirror p 332convex lens p 333convex mirror p 333decibel p 322Doppler effect p 323index of refraction p 329intensity p 322

loudness p 322opaque p 327pigment p 342pitch p 323plane mirror p 331translucent p 327transparent p 327

Vocabulary PuzzleMaker gpesciencecom

Use the illustration below to answer question 15

15 Describe how the position of the candlechanged if the image of the candle movedaway from the focal point

16 Apply Acoustic scientists sometimes doresearch in rooms that absorb all soundwaves How could such a room be used tostudy how bats find their food

17 Compare White light passes through atranslucent pane of glass and shines on ashirt Both the translucent glass and theshirt appear green Compare the colors oflight that are absorbed and transmitted bythe glass and the shirt

18 Infer Most mammals including dogs andcats canrsquot see colors Infer how the retinaof a catrsquos eye might be different from theretina of a human eye

19 Determine whether a convex lens could forman image that is enlarged real and upright

20 Infer A car comes to a railroad crossingThe driver hears a trainrsquos whistle and itspitch becomes lower What can beassumed about how the train is moving

21 Compare and contrast the reflection of lightfrom a white wall with a rough surfacewith the reflection of light from a mirror

Optical axis

One

focal

length

Two

focal

lengths

Image

Ray A

Object

Focal

point

Interpreting Graphics 22 Infer why a convex mirror and a concavelens can never produce a real image

23 Predict what color a white shirt wouldappear to be if the light reflected from theshirt passed through a red filter and thenthrough a green filter

24 Explain why windows might begin to rattlewhen an airplane flies overhead

25 Communicate Some people enjoy usingsnowmobiles Others object to the noisethat they make Write a proposal for a pol-icy that seems fair to both groups for theuse of snowmobiles in a state park

CHAPTER REVIEW 349

Use the wave speed equation ν ƒλ to answer

questions 26 and 27

26 Calculate Frequency A sonar pulse has awavelength of 30 cm and a speed inwater of 1500 ms Find its frequency

27 Calculate Wavelength What is the wave-length of a sound wave with a fre-quency of 440 Hz if the speed of soundin air is 340 ms

28 Calculate Angle of Incidence A light ray isreflected from a mirror If the anglebetween the incident ray and thereflected ray is 136deg what is the angleof incidence

29 Determine Object Distance You hold anobject in front of a concave mirror witha focal length of 30 cm If you do notsee a reflected image how far from themirror is the object

30 Calculate Speed The speed of light in avacuum is 300000 kms If the index ofrefraction of water is 133 what is thespeed of light in water

More Chapter Review gpesciencecom

1 Which of the following describes the imageformed by a convex mirror

A enlarged

B inverted

C real

D virtual

Use the figure below to answer question 2

2 Which of the following describes a light raythat passes through the focal point andthen is reflected by the mirror

A It travels parallel to the optical axis

B It forms a real image

C It is reflected back through the focal point

D It forms a virtual image

3 Why does an apple look red

A It reflects red light

B It absorbs red light

C It reflects green and blue light

D It reflects all colors of light except red

Use the figure below to answer questions 4 and 5

4 When the primary colors of light are addedtogether what color appears in area H

A cyan

B magenta

C white

D yellow

5 When the primary colors of light are addedtogether what color appears in area G

A cyan

B magenta

C white

D yellow

6 Which of the following increases as the fre-quency of a sound increases

A amplitude

B intensity

C loudness

D pitch

Red Blue

Green

F

H

G K

Focal pointOptical axis

350 STANDARDIZED TEST PRACTICE

Record your answers on the answer sheet provided by your teacher or on a sheet of paper

STANDARDIZED TEST PRACTICE 351

7 Which of the following parts of the eyeenable you to see colors in bright light

A cone cells

B cornea

C lens

D rod cells

Use the graph below to answer questions 8 and 9

8 Determine how far in centimeters theimage is from the lens when the object is15 centimeters from the lens

9 How far in centimeters is the object fromthe lens when the image distance andobject distance are equal

10 A shirt has stripes that are black and whitein white light If green light shines on thisshirt what colors will the black and whitestripes be

11 If you are on a moving train what hap-pens to the pitch of a crossing bell as youapproach the crossing and then moveaway from the crossing

Use the figure below to answer question 12

12 Describe the vision problem show by thefigure and explain how this vision prob-lem can be corrected

13 Explain why the human eye can see colorsbetter in bright light than in dim light

Image Distance fora Convex Lens

Ima

ge

dis

tan

ce (

cm)

30

25

20

15

10

5 10 15 20 25 30

Object distance (cm)

Standardized Test Practice gpesciencecom

Note Units Read carefully and make note of the units used in

any measurement

  • Glencoe Physical Science with Earth Science
    • Student Edition Table of Contents
      • Unit 1 Science and Technology
        • Chapter 1 The Nature of Science
          • Launch Lab Understanding Measurements
          • Foldables
          • Section 1 The Methods of Science
            • Science Online
            • Integrate History
            • Integrate Earth Science
            • Science Online
              • Section 2 Standards of Measurement
                • Applying Math Centimeters
                • Integrate Earth Science
                • Science Online
                • MiniLAB Determining the Density of a Pencil
                • Visualizing SI Dimensions
                  • Section 3 Communicating with Graphs
                    • Applying Math Temperature
                    • MiniLAB Graphing Temperature Change
                    • Lab Whats my graph
                    • Lab Design Your Own - Developing a Measurement System
                    • Science and Language Arts Thinking in Pictures and Other Reports from My Life with Autism
                      • Chapter 1 Study Guide
                      • Chapter 1 Review
                      • Chapter 1 Standardized Test Practice
                        • Chapter 2 Science Technology and Society
                          • Lab Technology in Your Life
                          • Foldables
                          • Section 1 Science and Technology
                            • MiniLAB Researching the Past
                            • Visualizing Technology Supplying Basic Needs
                            • Science Online
                              • Section 2 Forces that Shape Technology
                                • MiniLAB Evaluating the Benefits and Consequences of Technology
                                • Integrate Environment
                                • Integrate History
                                • Applying Science What impact does the accident at Chernobyl have on the future of nuclear power
                                • Science Online
                                • Lab Who contributes CO2
                                  • Section 3 Developing Technology
                                    • Integrate Life Science
                                    • Integrate Career
                                    • Lab Model and Invent - Care Package
                                    • Oops Accidents in Science A Slippery Situation
                                      • Chapter 2 Study Guide
                                      • Chapter 2 Review
                                      • Chapter 2 Standardized Test Practice
                                          • Unit 2 Motion Forces and Energy
                                            • Chapter 3 Motion Acceleration and Forces
                                              • Launch Lab Compare Speeds
                                              • Foldables
                                              • Section 1 Describing Motion
                                                • MiniLAB Measuring Average Speed
                                                • Science Online
                                                • Applying Math Average Speed
                                                • Integrate Astronomy
                                                • Science Online
                                                  • Section 2 Acceleration
                                                    • Integrate History
                                                    • Visualizing Acceleration
                                                      • Section 3 Motion and Forces
                                                        • Science Online
                                                        • MiniLAB Comparing Friction
                                                        • Lab Force and Acceleration
                                                        • Lab Design Your Own - Comparing Motion from Different Forces
                                                        • Science and Language Arts A Brave and Startling Truth
                                                          • Chapter 3 Study Guide
                                                          • Chapter 3 Review
                                                          • Chapter 3 Standardized Test Practice
                                                            • Chapter 4 The Laws of Motion
                                                              • Launch Lab The Force of Gravity
                                                              • Foldables
                                                              • Section 1 The First Two Laws of Motion
                                                                • MiniLAB Observing Inertia
                                                                • Science Online
                                                                • Applying Math The Acceleration of a Sled Solve a Simple Equation
                                                                  • Section 2 Gravity
                                                                    • Science Online
                                                                    • Integrate Earth Science
                                                                    • MiniLAB Observing Centripetal Force
                                                                    • Lab Gravity and Air Resistance
                                                                      • Section 3 The Third Law of Motion
                                                                        • Integrate Career
                                                                        • Visualizing Rocket Motion
                                                                        • Applying Math The Momentum of a Sprinter
                                                                        • Lab The Momentum of Colliding Objects
                                                                        • Science and History Newton and the Plague
                                                                          • Chapter 4 Study Guide
                                                                          • Chapter 4 Review
                                                                          • Chapter 4 Standardized Test Practice
                                                                            • Chapter 5 Energy
                                                                              • Launch Lab Energy Conversions
                                                                              • Foldables
                                                                              • Section 1 The Nature of Energy
                                                                                • Science Online
                                                                                • Applying Math Kinetic Energy
                                                                                • MiniLAB Interpreting Data from a Slingshot
                                                                                • Integrate Language Arts
                                                                                • Applying Math Gravitational Potential Energy
                                                                                • Lab Bouncing Balls
                                                                                  • Section 2 Conservation of Energy
                                                                                    • Visualizing Energy Transformations
                                                                                    • Integrate Environment
                                                                                    • MiniLAB Transforming Energy in a Paper Clip
                                                                                    • Science Online
                                                                                    • Integrate Health
                                                                                    • Lab Design Your Own - Swinging Energy
                                                                                    • Science and History The Impossible Dream
                                                                                      • Chapter 5 Study Guide
                                                                                      • Chapter 5 Review
                                                                                      • Chapter 5 Standardized Test Practice
                                                                                        • Chapter 6 Work and Machines
                                                                                          • Launch Lab Doing Work with a Simple Machine
                                                                                          • Foldables
                                                                                          • Section 1 Work
                                                                                            • Integrate Language Arts
                                                                                            • Applying Math Work
                                                                                            • MiniLAB Calculating Your Work and Power
                                                                                            • Applying Math Power
                                                                                              • Section 2 Using Machines
                                                                                                • MiniLAB Machines Multiplying Force
                                                                                                • Science Online
                                                                                                • Integrate Chemistry
                                                                                                  • Section 3 Simple Machines
                                                                                                    • Integrate History
                                                                                                    • Visualizing Levers in the Human Body
                                                                                                    • Science Online
                                                                                                    • Lab Levers
                                                                                                    • Lab Model and Invent - Using Simple Machines
                                                                                                    • Science and Society The Science of Very Very Small
                                                                                                      • Chapter 6 Study Guide
                                                                                                      • Chapter 6 Review
                                                                                                      • Chapter 6 Standardized Test Practice
                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                          • Launch Lab Relative Sizes of Earth the Moon and the Sun
                                                                                                          • Foldables
                                                                                                          • Section 1 Earth in Space
                                                                                                            • Science Online
                                                                                                            • Integrate Physics
                                                                                                              • Section 2 Time and Seasons
                                                                                                                • MiniLAB Modeling the Suns Rays at Solstice
                                                                                                                • Lab Comparing the Angle of Sunlight to Intensity
                                                                                                                  • Section 3 Earths Moon
                                                                                                                    • Applying Math Tides
                                                                                                                    • MiniLAB Modeling Phases and Eclipses
                                                                                                                    • Integrate History
                                                                                                                    • Integrate History
                                                                                                                    • Science Online
                                                                                                                    • Visualizing Water on the Moon
                                                                                                                    • Lab Identifying the Moons Surface Features and Apollo Landing Sites
                                                                                                                    • Oops Accidents in Science Even Great Scientists Make Mistakes
                                                                                                                      • Chapter 7 Study Guide
                                                                                                                      • Chapter 7 Review
                                                                                                                      • Chapter 7 Standardized Test Practice
                                                                                                                        • Chapter 8 The Solar System
                                                                                                                          • Launch Lab The Size of the Solar System
                                                                                                                          • Foldables
                                                                                                                          • Section 1 Planet Motion
                                                                                                                            • Integrate History
                                                                                                                            • MiniLAB Plotting Retrograde Motion
                                                                                                                            • Integrate Physics
                                                                                                                            • Applying Math Heliocentric Longitude (HL)
                                                                                                                              • Section 2 The Inner Planets
                                                                                                                                • Science Online
                                                                                                                                • Integrate Chemistry
                                                                                                                                • Lab Interpreting Features of Marss Surface
                                                                                                                                  • Section 3 The Outer Planets
                                                                                                                                    • Integrate Language Arts
                                                                                                                                    • Visualizing What Galileo Saw
                                                                                                                                    • Science Online
                                                                                                                                    • MiniLAB Comparing Sizes of Outer and Inner Planets
                                                                                                                                      • Section 4 Life in the Solar System
                                                                                                                                        • Lab Design Your Own - Testing Unknown Soil Samples for Life
                                                                                                                                        • Science Stats Night Sky Wonders
                                                                                                                                          • Chapter 8 Study Guide
                                                                                                                                          • Chapter 8 Review
                                                                                                                                          • Chapter 8 Standardized Test Practice
                                                                                                                                              • Unit 3 Energy in Motion
                                                                                                                                                • Chapter 9 Heat and States of Matter
                                                                                                                                                  • Launch Lab Expansion of a Gas
                                                                                                                                                  • Foldables
                                                                                                                                                  • Section 1 Temperature and Thermal Energy
                                                                                                                                                    • Applying Math Converting to Celsius
                                                                                                                                                    • Science Online
                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                    • Applying Math Change in Thermal Energy
                                                                                                                                                      • Section 2 States of Matter
                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                        • Science Online
                                                                                                                                                        • MiniLAB Comparing States of Water
                                                                                                                                                          • Section 3 Transferring Thermal Energy
                                                                                                                                                            • MiniLAB Comparing Thermal Conductors
                                                                                                                                                            • Visualizing Convection Currents
                                                                                                                                                            • Lab Convection in Gases and Liquids
                                                                                                                                                              • Section 4 Using Thermal Energy
                                                                                                                                                                • Integrate History
                                                                                                                                                                • Science Online
                                                                                                                                                                • Lab Conduction in Gases
                                                                                                                                                                • Science Stats Surprising Thermal Energy
                                                                                                                                                                  • Chapter 9 Study Guide
                                                                                                                                                                  • Chapter 9 Review
                                                                                                                                                                  • Chapter 9 Standardized Test Practice
                                                                                                                                                                    • Chapter 10 Waves
                                                                                                                                                                      • Launch Lab How do waves transfer energy
                                                                                                                                                                      • Foldables
                                                                                                                                                                      • Section 1 The Nature of Waves
                                                                                                                                                                        • Visualizing Formation of Ocean Waves
                                                                                                                                                                        • Science Online
                                                                                                                                                                          • Section 2 Wave Properties
                                                                                                                                                                            • MiniLAB Observing Wavelength
                                                                                                                                                                            • Integrate Social Studies
                                                                                                                                                                            • Applying Math The Speed of Sound
                                                                                                                                                                            • Lab Wave Speed and Tension
                                                                                                                                                                              • Section 3 The Behavior of Waves
                                                                                                                                                                                • Science Online
                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                • MiniLAB Experimenting with Resonance
                                                                                                                                                                                • Lab Measuring Wave Properties
                                                                                                                                                                                • Science and History Making Waves
                                                                                                                                                                                  • Chapter 10 Study Guide
                                                                                                                                                                                  • Chapter 10 Review
                                                                                                                                                                                  • Chapter 10 Standardized Test Practice
                                                                                                                                                                                    • Chapter 11 Sound and Light
                                                                                                                                                                                      • Launch Lab What sound does a ruler make
                                                                                                                                                                                      • Foldables
                                                                                                                                                                                      • Section 1 Sound
                                                                                                                                                                                        • MiniLAB Comparing Intensity
                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                        • Science Online
                                                                                                                                                                                        • Applying Math Using Sonar
                                                                                                                                                                                          • Section 2 Reflection and Refraction of Light
                                                                                                                                                                                          • Section 3 Mirrors Lenses and the Eye
                                                                                                                                                                                            • Visualizing Images Formed by a Convex Lens
                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                            • MiniLAB Experimenting with Focal Lengths
                                                                                                                                                                                            • Lab Reflections of Reflections
                                                                                                                                                                                              • Section 4 Light and Color
                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Lab Design Your Own - Blocking Noise Pollution
                                                                                                                                                                                                • Science and Language Arts A Haiku Garden The Four Seasons in Poems and Print
                                                                                                                                                                                                  • Chapter 11 Study Guide
                                                                                                                                                                                                  • Chapter 11 Review
                                                                                                                                                                                                  • Chapter 11 Standardized Test Practice
                                                                                                                                                                                                    • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                      • Launch Lab Global Jigsaw Puzzle
                                                                                                                                                                                                      • Foldables
                                                                                                                                                                                                      • Section 1 Evolution of Earths Crust
                                                                                                                                                                                                        • Applying Math Spreading Distances
                                                                                                                                                                                                        • Integrate Physics
                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                          • Section 2 Earthquakes
                                                                                                                                                                                                            • MiniLAB Demonstrating Four Types of Stress
                                                                                                                                                                                                            • Visualizing Earthquake-Proof Buildings
                                                                                                                                                                                                              • Section 3 Earths Interior
                                                                                                                                                                                                              • Section 4 Volcanoes
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • MiniLAB Modeling Lava Viscosity
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                • Lab A Case for Pacific Plate Motion
                                                                                                                                                                                                                • Lab Earthquake Earthquake Wheres the earthquake
                                                                                                                                                                                                                • Science and History Volcano Weather
                                                                                                                                                                                                                  • Chapter 12 Study Guide
                                                                                                                                                                                                                  • Chapter 12 Review
                                                                                                                                                                                                                  • Chapter 12 Standardized Test Practice
                                                                                                                                                                                                                      • Unit 4 Forms of Energy
                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                          • Launch Lab Electric Circuits
                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                          • Section 1 Electric Charge
                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                            • Visualizing Lightning
                                                                                                                                                                                                                            • MiniLAB Investigate Charged Objects
                                                                                                                                                                                                                              • Section 2 Electric Current
                                                                                                                                                                                                                                • MiniLAB Investigating Battery Addition
                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                • Lab Identifying Conductors and Insulators
                                                                                                                                                                                                                                  • Section 3 Electrical Energy
                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                    • Applying Math Power Used by a Clothes Dryer
                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                    • Applying Math Electrical Energy Used by a Microwave Oven
                                                                                                                                                                                                                                    • Lab Design Your Own - Comparing Series and Parallel Circuits
                                                                                                                                                                                                                                    • Science and Language Arts Invisible Man
                                                                                                                                                                                                                                      • Chapter 13 Study Guide
                                                                                                                                                                                                                                      • Chapter 13 Review
                                                                                                                                                                                                                                      • Chapter 13 Standardized Test Practice
                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                          • Launch Lab The Strength of Magnets
                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                          • Section 1 Magnetism
                                                                                                                                                                                                                                            • MiniLAB Observing Magnetic Interference
                                                                                                                                                                                                                                            • Integrate Earth Science
                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                            • Applying Science How can magnetic parts of a junk car be salvaged
                                                                                                                                                                                                                                            • MiniLAB Making Your Own Compass
                                                                                                                                                                                                                                              • Section 2 Electricity and Magnetism
                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                  • Section 3 Producing Electric Current
                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                    • Visualizing Motors and Generators
                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                    • Lab Electricity and Magnetism
                                                                                                                                                                                                                                                    • Lab Design Your Own - Controlling Electromagnets
                                                                                                                                                                                                                                                    • Science and History Body Art
                                                                                                                                                                                                                                                      • Chapter 14 Study Guide
                                                                                                                                                                                                                                                      • Chapter 14 Review
                                                                                                                                                                                                                                                      • Chapter 14 Standardized Test Practice
                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                          • Launch Lab Can electromagnetic waves change materials
                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                          • Section 1 What are electromagnetic waves
                                                                                                                                                                                                                                                            • MiniLAB Investigating Electromagnetic Waves
                                                                                                                                                                                                                                                            • Applying Math The Speed of Light in Water
                                                                                                                                                                                                                                                              • Section 2 The Electromagnetic Spectrum
                                                                                                                                                                                                                                                                • MiniLAB Heating with Microwaves
                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                • Lab The Shape of Satellite Dishes
                                                                                                                                                                                                                                                                  • Section 3 Radio Communication
                                                                                                                                                                                                                                                                    • Visualizing Radio Broadcasts
                                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Lab Use the Internet - Radio Frequencies
                                                                                                                                                                                                                                                                    • Science and History Riding a Beam of Light
                                                                                                                                                                                                                                                                      • Chapter 15 Study Guide
                                                                                                                                                                                                                                                                      • Chapter 15 Review
                                                                                                                                                                                                                                                                      • Chapter 15 Standardized Test Practice
                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                          • Launch Lab Heating with Solar Energy
                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                          • Section 1 Fossil Fuels
                                                                                                                                                                                                                                                                            • Visualizing The Formation of Fossil Fuels
                                                                                                                                                                                                                                                                            • MiniLAB Designing an Efficient Water Heater
                                                                                                                                                                                                                                                                              • Section 2 Nuclear Energy
                                                                                                                                                                                                                                                                                • Integrate Earth Science
                                                                                                                                                                                                                                                                                • Integrate Social Science
                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                • Applying Science Can a contaminated radioactive site be reclaimed
                                                                                                                                                                                                                                                                                  • Section 3 Renewable Energy Sources
                                                                                                                                                                                                                                                                                    • MiniLAB Using Solar Power at Home
                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                    • Lab Solar Heating
                                                                                                                                                                                                                                                                                    • Lab Use the Internet How much does energy really cost
                                                                                                                                                                                                                                                                                    • Science and Society Reacting to Nuclear Energy
                                                                                                                                                                                                                                                                                      • Chapter 16 Study Guide
                                                                                                                                                                                                                                                                                      • Chapter 16 Review
                                                                                                                                                                                                                                                                                      • Chapter 16 Standardized Test Practice
                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                          • Lab Atmospheric Pressure
                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                          • Section 1 Earths Atmosphere
                                                                                                                                                                                                                                                                                            • MiniLAB Visualizing Convection
                                                                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                                                                            • Lab Visualizing a Temperature Inversion
                                                                                                                                                                                                                                                                                              • Section 2 Weather
                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Coriolis Effect
                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                  • Section 3 Climate
                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                    • Visualizing Earths Biogeophysical System
                                                                                                                                                                                                                                                                                                      • Section 4 Earths Changing Climates
                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                        • Applying Math Carbon Dioxide (CO2) Concentration
                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Investigating Microclimate
                                                                                                                                                                                                                                                                                                        • Science and Language Arts The Grapes of Wrath
                                                                                                                                                                                                                                                                                                          • Chapter 17 Study Guide
                                                                                                                                                                                                                                                                                                          • Chapter 17 Review
                                                                                                                                                                                                                                                                                                          • Chapter 17 Standardized Test Practice
                                                                                                                                                                                                                                                                                                              • Unit 5 Matter and Earth Materials
                                                                                                                                                                                                                                                                                                                • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                  • Launch Lab Demonstrate the Distillation of Water
                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                  • Section 1 Composition of Matter
                                                                                                                                                                                                                                                                                                                    • Visualizing Elements
                                                                                                                                                                                                                                                                                                                    • MiniLAB Classifying Materials
                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                    • Lab Comparing Pure Substances and Mixtures
                                                                                                                                                                                                                                                                                                                      • Section 2 Properties of Matter
                                                                                                                                                                                                                                                                                                                        • Integrate Environment
                                                                                                                                                                                                                                                                                                                        • MiniLAB Separating Ink
                                                                                                                                                                                                                                                                                                                        • Integrate History
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                                                                                                                                                                                                                                                                                                                        • Science Stats Intriguing Elements
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Study Guide
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                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
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                                                                                                                                                                                                                                                                                                                                      • Section 3 The Periodic Table
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                                                                                                                                                                                                                                                                                                                                                                          • Section 3 Groundwater
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                                                                                                                                                                                                                                                                                                                                                                              • Section 4 Geologic Time
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                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Study Guide
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                                                                                                                                                                                                                                                                                                                                                                                      • Unit 6 Interactions of Matter
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                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Study Guide
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Page 11: 706 S1 318-326 GPS09 - Light-and-Sound - home · PDF fileWhat sound does a ruler make? ... sound waves cannot travel in empty space where there are no particles. ... sound travels

328 CHAPTER 11 Sound and Light

Reflection of LightHave you glanced in a mir-

ror today You see your reflec-tion in the mirror when light isreflected off you strikes themirror and is reflected off themirror into your eye Becauselight behaves as a wave itobeys the law of reflection asshown in Figure 9 Recall thataccording to the law of reflec-tion the angle at which a lightwave strikes a surface is thesame as the angle at which it is

reflected Light reflected from any surfacemdasha mirror or a sheetof papermdashobeys this law

Regular and Diffuse Reflection Why can you see yourreflection in a store window but not in a sheet of paper Theanswer has to do with the smoothness of the surfaces A smootheven surface such as a pane of glass produces a sharp image byreflecting parallel light waves in only one direction Reflection oflight waves from a smooth surface is regular reflection To causea regular reflection the roughness of a surface must be less thanthe wavelengths it reflects A sheet of paper has an uneven sur-face that causes incoming parallel light waves to be reflected inmany directions as shown in Figure 10 Reflection of light froma rough surface is diffuse reflection

Scattering Diffuse reflection is a type of scattering thatoccurs when light waves traveling in one direction are made totravel in many different directions Scattering also occurs whenlight waves traveling through the air reflect off small particlesAn example is light scattering off the small water droplets thatmake up a cloud Scattering causes the cloud to appear whiteeven though the droplets are transparent

What is scattering of light

Figure 9 According to the law of

reflection light is reflected so that

the angle of incidence always

equals the angle of reflection

Figure 10 A sheet of paper

has an uneven surface that

produces a diffuse reflection

Explain Use the law ofreflection to explain why arough surface causes parallellight waves to be reflected inmany directions

Mirror

i = angle of

incidence

i

r

i

r

r = angle of

reflection

Normal

Normal

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Refraction of LightWhat occurs when a light wave passes from one material to

anothermdashfrom air to water for example Recall that refractionis caused by a change in the speed of a wave when it passes fromone material to another If the light wave is traveling at an angleto the boundary between the materials and the speed of light isdifferent in the two materials the wave will be bent or refracted

Why does refraction occur

The Index of Refraction The amount of bending that takesplace depends on the speeds of light in both materials Thegreater the change in speed the more the light will be bent asit passes at an angle from one material to the other Figure 11

shows an example of refraction Every material has an index ofrefraction which is the ratio of the speed of light in a vacuum tothe speed of light in the material The index of refraction indi-cates how much the speed of light is reduced in the materialcompared to its speed in empty space

The larger the index of refraction the more light is sloweddown in the material For example because glass has a largerindex of refraction than air light moves more slowly in glassthan air The index of refraction is usually largest for solids andsmallest for gases

Prisms A sparkling glass prism hangs in a sunny windowrefracting the sunlight and projecting a colorful pattern onto thewalls of the room How does the refraction of light create thesecolors The spectrum of colors is produced because the speed oflight in a material also depends on the wave-length of the light In a glass prism light waveswith longer wavelengths such as red light wavesare slowed less than light waves with shorterwavelengths such as blue light waves

Figure 12 shows what occurs when whitelight passes through a prism White light suchas sunlight is made up of light waves withrange of wavelengths from red to blue The tri-angular prism refracts the light twicemdashoncewhen it enters the prism and again when itleaves the prism and reenters the air Becausethe longer wavelengths of light are slowed lessthan the shorter wavelengths are red light isbent the least As a result of these differentamounts of bending the different colors areseparated when they emerge from the prism

Figure 11 The spoon looks

broken because light waves are

refracted as they change speed

when they pass from the water to

the air

329

Figure 12 Refraction causes a

prism to separate a beam of white

light into different colors

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330 CHAPTER 11 Sound and Light

Self Check

1 Compare and contrast opaque transparent and

translucent materials Give one example of each

2 Discuss why you can see your reflection in a smooth

piece of aluminum foil but not in a crumpled ball of foil

3 Infer what happens to light waves that are reflected off

dust particles in the air

4 Explain what happens to white light when it passes

through a prism

5 Think Critically Suppose a material has the same index

of refraction as water How would a light wave change

direction as it traveled from water into this material

Summary

Light and Matter

bull The amount of light that is absorbed

reflected or transmitted depends on the

material making up the object

Reflection of Light

bull Light waves always obey the law of reflection

the angle of incidence equals the angle of

reflection

bull Regular reflection causes parallel light waves

to be reflected in only one direction

bull Diffuse reflection causes parallel light waves

to be reflected in many directions

bull Scattering occurs when light waves are reflected

and travel in many different directions

Refraction of Light

bull Refraction occurs when a light wave changes

speed in moving from one material to another

bull The index of refraction of a material indicates

how much light slows down in the material

6 Find an Angle A light wave strikes a mirror at an

angle of 42deg from the surface of the mirror What

angle does the reflected wave make with the normal

7 Find an Angle A light wave reflects from a mirror at

27deg from the normal What was the angle between

the mirror and the incident wave

Mirages When yoursquore traveling in a car you might see whatlooks like a pool of water on the road ahead As you get closerthe water seems to disappear Yoursquove seen a miragemdashan image ofa distant object produced by the refraction of light through airlayers of different densities Mirages result when the air atground level is much warmer or cooler than the air above asshown in Figure 13 The density of air increases as air cools andlight waves move slower in cooler air than in warmer air As aresult light waves are refracted as they pass through air layerswith different temperatures

Figure 13 Mirages result when

air near the ground is much

warmer or cooler than the air

above This causes light waves

reflected from an object to refract

creating one or more additional

images

MirageWarm air

Cool air

More Section Review gpesciencecom

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SECTION 3 Mirrors Lenses and the Eye 331

Light RaysLight sources send out light waves in all directions These

waves spread out like ripples on the surface of water spread outfrom the point of impact of a pebble You can think of the lightcoming from the source as being many narrow beams of light trav-eling in all directions Each narrow light beam is called a light ray

MirrorsA mirror is any surface that produces a regular reflection A pool

of still water a metal pan and even the back of a shiny spoon can bemirrors Mirrors can be flat curved inward or curved outward

Plane Mirrors A flat smooth mirror is a plane mirror Whenyou look in a plane mirror your image appears upright If youstand 1 m from the mirror your image appears 1 m behind themirror or 2 m from you In fact your image is what a friend stand-ing 2 m from you would see Figure 14 shows how your image isformed First light rays from a light source strike you Every pointthat is struck by the light rays reflects these rays so they travel out-ward in all directions If your friend were looking at you thesereflected light rays coming from you would enter her eyes so shecould see you However if a mirror is placed between you and yourfriend light rays are reflected from the mirror back to your eyes

Mirrors Lenses andthe Eye

Reading Guide

Describe how images are formed

by three types of mirrors Explain how convex and concave

lenses form images Explain how the human eye

enables you to see Describe how lenses are used to

correct vision problems

Mirrors and lenses are used in optical

instruments such as cameras and

telescopes

Review Vocabulary

reflection the process of changing

direction after striking a surface

New Vocabulary

bull plane mirror

bull concave mirror

bull convex mirror

bull convex lens

bull concave lens

Figure 14 Seeing an image of

yourself in a mirror involves two

sets of reflections light rays are

reflected from you and then are

reflected by the mirror

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332 CHAPTER 11 Sound and Light

Virtual and Real Images The forma-tion of an image by a plane mirror isshown in Figure 15 Your brain assumesthat light rays travel in a straight line As aresult rays that enter your eyes seem tocome from behind the mirror This makesthe image seem to be behind the mirrorHowever no light rays actually passthrough the place where the image seemsto be located This type of image is called avirtual image Plane mirrors always formvirtual images If light rays from an objectpass through the location of the image theimage is called a real image Curved mir-rors can form both real and virtual images

Concave Mirrors If the surface of a mirror is curved inwardit is called a concave mirror as shown in Figure 16 The opticalaxis is an imaginary straight line drawn perpendicular to thesurface of the mirror at its center Every light ray traveling par-allel to the optical axis is reflected through a point on the opti-cal axis called the focal point The distance from the center ofthe mirror to the focal point is called the focal length

The image formed by a concave mirror depends on the loca-tion of the object relative to the focal point Figure 16 shows acandle located more than twice the focal length from the mirrorAlthough many light rays come from each point on the candleonly two rays from the same point are shown Ray A passesthrough the focal point and then reflects off the mirror movingparallel to the optical axis Ray B travels parallel to the opticalaxis before reflecting off the mirror and passing through thefocal point The point where the two rays meet is the location ofthe image of the original point on the candle The image formedis a real image because light rays from the candle pass throughthe place where the image is located

Figure 16 Rays A and B start from the same

place on the candle travel in different directions

and meet again on the reflected image

Diagram how two other points on the image ofthe candle are formed

Figure 15 Your brain interprets

the light rays reflected by the

mirror as coming from a point

behind the mirror

Infer how the size of your imagein a plane mirror depends on yourdistance from the mirror

Focalpoint

Optical axis

Ray B

Ray A

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SECTION 3 Mirrors Lenses and the Eye 333

Images Produced by a ConcaveMirror When an object is between oneand two focal lengths from a concavemirror the image is real inverted andlarger than the object An object closerthan one focal length from a concavemirror produces a virtual image that isupright and larger than the object Noimage is produced if the object islocated at the focal point

Convex Mirrors When you are in astore look up toward one of the backcorners or at the end of an aisle to see ifa large rounded mirror is mountedthere You can see a large area of the store in such a mirror Amirror that curves outward like the back of a spoon is called aconvex mirror Light rays that hit a convex mirror diverge orspread apart after they are reflected Figure 17 shows how therays from an object are reflected by a convex mirror to form animage The reflected rays diverge and never meet so a convexmirror forms only a virtual image The image also is upright andsmaller than the actual object is

Describe the image formed by a convex mirror

LensesWhat do your eyes have in common with cameras eyeglasses

and microscopes Each of these contains at least one lens A lens is atransparent object with at least one curved surface that causes lightrays to refract The image that a lens forms depends on the shape ofthe lens Like curved mirrors lenses can be convex or concave

Convex Lenses A convex lens is thicker in the middle than atthe edges Its optical axis is an imaginary straight line that is per-pendicular to the surface of the lens at its thickest point When lightrays approach a convex lens traveling parallel to its opticalaxis the rays are refracted toward the center of the lens asin Figure 18 Light rays traveling along the optical axis arenot bent at all All light rays traveling parallel to the opti-cal axis are refracted so they pass through a single pointwhich is the focal point of the lens The less curved thesides of the lens the less light rays are bent As a resultlenses with flatter sides have longer focal lengths Figure 19

on the next page shows that convex lenses can form eitherreal or virtual images

Figure 18 Convex lenses are

thicker in the middle than at the

edges Light rays that are parallel

to the optical axis are refracted so

that they pass through the focal

point A light ray that passes

through the center of the lens is

not refracted

Figure 17 A convex mirror

forms a reduced upright virtual

image

Optical axis

Ray A

Ray B

Focallength

Focalpoint

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Figure 19

VISUALIZING IMAGES FORMED BY A CONVEX LENS

334 CHAPTER 11 Sound and Light

Aconvex lens can form images that are real or virtual enlarged or reduced and upright orinverted Just as for a concave mirror the type of image formed by a convex lens depends on thelocation of the object relative to the focal point of the lens

Optical axis

One

focal

length

Two

focal

lengthsRay B

Image

Ray A

Object

Focal

point

Optical axis

One

focal

length

Two

focal

lengths

Ray B

Ray AObject

Image

Focal

point

Optical axis

Ray B

ObjectRay A

One

focal

length

Focal

pointImage

If the object is more than two focal lengths from the lens the image formed is real inverted andsmaller than the object As the object moves farther from the lens the image becomes smaller

If the object is between one and two focal lengths from the lens the image formed is real invertedand larger than the object As the object moves closer to the focal point the image becomes larger

If the object is less than one focal length from the lens the image is virtual upright and larger thanthe object The image is virtual because the light rays from the object diverge after they pass throughthe lens The image becomes smaller as the object moves closer to the lens

SECTION 3 Mirrors Lenses and the Eye 335

Concave Lenses A concave lens is thinnerin the middle and thicker at the edges Asshown in Figure 20 light rays that passthrough a concave lens bend away from theoptical axis The rays spread out and nevermeet so a real image is never formed Theimage is always virtual upright and smallerthan the object is Concave lenses are used insome types of eyeglasses and some telescopesConcave lenses usually are used in combinationwith other lenses

What type of image is formed by a concave lens

The Human EyeWhat determines how well you can see the words on this

page If you donrsquot need eyeglasses the structure of your eye givesyou the ability to focus on these words and other objects aroundyou Look at Figure 21 Light enters your eye through a trans-parent covering on your eyeball called the cornea The corneacauses light rays to bend so that they converge The light thenpasses through an opening called the pupil Behind the pupil isa flexible convex lens Muscles attached to the lens change itsshape to help focus light forming a sharp image on your retina

The retina is the inner lining of your eye The retina con-tains light-sensitive cells that convert an image into electricalsignals These signals then are carried along the optic nerve toyour brain to be interpreted With this complex structurethe human eye is capable of seeing clearly in bright and dimconditions focusing on both near and far objects and alsodetecting colors

Figure 20 A concave lens

refracts light rays so they spread

out away from the optical axis

Classify Is a concave lens mostlike a concave mirror or a convexmirror

Optical axis

Retina

Focalpoint

Pupil

Cornea

Lens

Optic nerve

Figure 21 The cornea and lens in your eye

bend light rays so that a sharp image is

formed on the retina

Eye Doctors Optometristsand ophthalmologists treatmany different eye prob-lems They often useadvanced technology todiagnose and correct mal-functioning parts of theeye Research an eye prob-lem and how it is treatedWrite a paragraph describ-ing what parts of the eyeare affected by the problemand how doctors correct it

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336 CHAPTER 11 Sound and Light

Brightness and Intensity The human eye can adjust to thebrightness of the light that strikes it If you step outside on asunny day you may have to shade your eyes against the intensityof the sunlight Light intensity is the amount of light energy thatstrikes a certain area each second Brightness is the human per-ception of light intensity Sunlight seems bright because a largeamount of light energy strikes your retina each second Youreyes respond to bright light by decreasing the size of your pupilThis reduces the amount of light that enters your eye and strikesthe retina

Intensity depends on your distance from a light source Ifyou move away from a bare lightbulb you can see how theintensity of the light rapidly decreases Because light rays spreadout from the source less light energy strikes your retina thefarther away you are from the bulb

Correcting Vision ProblemsIf you have good vision you should be able to see objects

clearly when they are 25 cm or farther away from your eyes Asharp image of an object should be formed on your retinaHowever for many people the image is blurry or formed in thewrong place causing vision problems

Farsightedness If you can see distant objects clearly butcanrsquot bring nearby objects into focus then you are farsighted Inthis case the eyeball might be too short or the lens isnrsquot curvedenough to form a sharp image of nearby objects on the retinaas shown in Figure 22 To correct the problem convex lensescan be used to bend incoming light rays so they converge beforethey enter the eye

Experimenting withFocal LengthsProcedure1 Complete the safety form

2 Fill a glass test tube with

water and seal it with a

lid or stopper3 Type or print SULFUR

DIOXIDE in capital letters

on a piece of paper4 Set the test tube horizon-

tally over the words

Record your observations

5 Hold the tube at several

heights above the words

Record your observations

Analysis1 Describe how the words

changed as the height of

the test tube increased

2 Classify the image at each

height as real or virtual

Focal

point

Correctedfarsighted eye

Light fromnearby object

Focalpoint

Light fromnearby object

Farsighted eye

The focal length of a farsighted eye is too long to form

a sharp image of nearby objects on the retina

A convex lens in front of a farsighted eye enables a sharp

image of nearby objects to be formed on the retina

Figure 22 Farsightedness can

be corrected by convex lenses

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SECTION 3 Mirrors Lenses and the Eye 337

Self Check

1 Diagram how light rays from an object are reflected by

a convex mirror to form an image

2 Infer how the size of the image changes if an object

that is less than one focal length from a concave mirror

moves closer to the mirror

3 Explain how the focal length of a convex lens changes

as the sides of the lens become less curved

4 Compare the image of an object less than one focal

length from a convex lens with the image of an object

more than two focal lengths from the lens

5 Think Critically Describe the image formed by a light

source placed at the focal point of a convex lens

Summary

Mirrors

bull A plane mirror forms upright virtual images

bull The image formed by a concave mirror

depends on the location of the object relative

to the focal point

bull Convex mirrors always produce virtual upright

images that are smaller than the object

Lenses

bull The image formed by a convex lens depends

on the distance of the object from the lens

bull Concave lenses always form virtual upright

images that are smaller than the object

The Eye and Vision

bull The eye contains a lens that changes shape to

produce sharp images on the retina

bull Farsightedness occurs when the eye cannot

form a sharp image of nearby objects

Nearsightedness occurs when the eye cannot

form sharp images of distant objects

6 Calculate Object Distance If you looked through a

convex lens with a focal length of 15 cm and saw a

real inverted enlarged image what is the maximum

distance between the lens and the object

Nearsightedness If you have nearsighted friends you knowthat they can see only nearby objects clearly Their eyes cannotform a sharp image on the retina of an object that is far awayInstead the image is formed in front of the retina as shown inFigure 23 To correct this problem a nearsighted person canwear concave lenses Figure 23 shows how a concave lens causesincoming light rays from distant objects to diverge before theyreach the eye Then the rays can be focused by the eye to form asharp image on the retina

Figure 23 Nearsightedness can

be corrected with concave lenses

Focalpoint

Light fromdistant object

Nearsighted eye

Focalpoint

Light fromdistant object

Correctednearsighted eye

When a nearsighted person looks at distant objects a

sharp image is formed in front of the retina

A concave lens in front of a nearsighted eye makes light

rays diverge so a sharp image is formed on the retina

More Section Review gpesciencecom

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How can you see the back of your head You

can use two mirrors to view a reflection of a

reflection of the back of your head

Real-World ProblemHow many images are seen in two mirrors

Goal Infer how the number of images depends

on the angle between two mirrors

Materialsplane mirrors (2) protractor

masking tape paper clip

Safety Precautions

Handle glass mirrors and paper clips carefully

Procedure1 Complete the safety form

2 Lay one mirror on top of the other with the

mirror surfaces together Tape together one

side so they can open and close Use tape to

label them L and R for left and right

3 Open the mirrors and stand them on a sheet

of paper at an angle of 72deg

4 Bend one leg of a paper clip up 90deg and

place it close to the front of the R mirror

5 Count the number of images of the paper

clip you see in the R and L mirrors Record

these numbers in your data table

6 The mirrors create an image of a circle

divided into wedges Record the number

of wedges

7 Hold the R mirror still and slowly move the Lmirror to 90deg Record the numbers of images

of the clip and wedges in the circle Repeat

this time opening the mirrors to 120deg

Conclude and Apply1 Infer the relationship between the number

of wedges and paper clip images

2 Determine the angle that would divide a

circle into six wedges Hypothesize how

many images would be produced Test your

hypothesis

Reflections of Reflections

Demonstrate for younger students the

relationship between the angle of the

mirrors and the number of reflections

338 CHAPTER 11 Sound and Light

Angle

Number of Number

of Mirrors Paper Clip Images

of Wedges R L

72ordm

90ordm

120ordm

Images and Wedges Seen in the Mirrors

Do not write in this book

SECTION 4 Light and Color 339

Why Objects Have ColorWhy do some apples appear red while others look green or

yellow An objectrsquos color depends on the wavelengths of light itreflects Recall that white light is a blend of all colors of visiblelight When a red apple is struck by white light it reflects redlight back to your eyes and absorbs all of the other colorsFigure 24 shows white light striking a green leaf Only the wave-lengths corresponding to green light are reflected to your eyes

Although some objects appear to be black black isnrsquot acolor Black is the absence of visible light Objects that appearblack absorb all colors of light and reflect little or no light backto your eyes White objects appear to be white because theyreflect all colors of visible light

Why does a white object appear white

Colored Filters Wearing tinted glasses changesthe color of almost everything you see If the lensesare yellow the world takes on a golden glow If theyare rose colored everything looks rosy Somethingsimilar would occur if you placed a colored clearplastic sheet over this white page The paper wouldappear to be the same color as the plastic The plasticsheet and the tinted lenses are filters A filter is atransparent material that transmits one or more col-ors of light but absorbs all others The color of a fil-ter is the color of the light that it transmits

Light and Color

Reading Guide

Explain how you see color Describe the difference between

light color and pigment color Predict what happens when dif-

ferent colors are mixed

From traffic lights to great works of

art color is an important part of your

world

Review Vocabulary

retina inner layer of the eye con-

taining cells that convert light

images into electrical signals

New Vocabulary

bull pigment

Figure 24 This leaf absorbs all

wavelengths of visible light except

the wavelengths you see as green

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340 CHAPTER 11 Sound and Light

Looking Through Colored Filters Figure 25 shows howthe color of an object can change when you look at it throughvarious colored filters The cooler looks blue under white lightbecause it reflects only the wavelengths of blue light that strikeit If you look at the cooler through a blue filter the cooler stilllooks blue because the blue filter transmits the reflected bluelight However if you look at the cooler through a red filter thecooler seems black because the red filter blocks the blue lightreflected by the cooler

Why does a blue object appear black whenviewed through a red filter

Seeing ColorAs you approach a busy intersection the color of the traffic

light changes from green to yellow to red On the cross street thecolor changes from red to green At a busy intersection trafficsafety depends on your ability to detect color changes rapidlyHow do you see colors

Light and the Eye In a healthy eye light enters the eyethrough the cornea is focused by the lens and finally forms animage on the retina The retina is made up of two types of cellsthat absorb light as shown in Figure 26 When these cellsabsorb light energy chemical reactions convert light energy intonerve impulses that are transmitted to the brain One type ofcell in the retina called a cone enables you to distinguish colorsand detailed shapes of objects Cones need bright light to gener-ate nerve impulses so they do not operate in dim light As aresult even brightly colored objects might look gray or black indim light

Figure 25 The color of this

cooler changes when viewed

through different color filters

Topic Color BlindnessVisit for Web

links to information about the

causes of color blindness

Activity Research the causes

and types of color blindness Find

out how cones are related to the

ability to distinguish colors

gpesciencecom

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SECTION 4 Light and Color 341

Cones and Rods Your eyes have three types of cones each ofwhich responds to a different range of wavelengths Red conesrespond to mostly red and yellow light Green cones respond tomostly yellow and green light Blue cones respond to mostlyblue and violet light The second type of cell in the retina calleda rod is sensitive to dim light and enables you to see at nightHowever rod cells do not enable you to see colors

Interpreting Color Why does a bananalook yellow The light reflected by the

banana causes the cone cells that are sensitive to red and greenlight to send signals to your brain Your brain could get the samesignal if a mixture of red light and green light reached your eyesThis mixture also would cause your red and green cones torespond and you would see the color yellow As a result lightwith wavelengths corresponding to yellow light and light that isa mixture of red and green light both cause the color yellow tobe seen What happens when you look at a white shirt You seewhite when all wavelengths of visible light enters your eyes Thenall three sets of cones cells send signals to the brain The com-bination of these signals cause you to see the shirt as white

Color Blindness If one or more of your sets of cone cellsdo not function properly you might not be able to distinguishcertain colors This condition is called color blindness orcolor deficiency About eight percent of men and one-halfpercent of women have some form of color blindness Themost common form of color blindness makes it difficult todistinguish between red and green Figure 27 shows an imagethat is used in a test for redndashgreen color blindness Becausered and green are used in traffic signals drivers and pedestri-ans must be able to identify them

Retina

Rod

Cone

Lens

Figure 27 Color blindness is an

inherited sex-linked condition in

which certain sets of cones in the

retina do not function properly

Identify the number that you seein the dots

Figure 26 Light enters the eye

and focuses on the retina The two

types of light-detecting cells

that make up the retina

are called rods and cones

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342 CHAPTER 11 Sound and Light

Mixing ColorsIf you have ever browsed through a paint store you have

probably seen displays where customers can select paint samplesof almost every imaginable color The colors are a result of mix-tures of pigments For example you might have mixed blue andyellow paint to produce green paint A pigment is a coloredmaterial that is used to change the color of other substancesThe color of a pigment results from the different wavelengths oflight that the pigment reflects

Mixing Colored Lights From the glowing orange of a sun-set to the deep blue of a mountain lake all the colors you see canbe made by mixing three colors of light These three colorsmdashred green and bluemdashare the primary colors of light They cor-respond to the three different types of cones in the retina ofyour eye When mixed together in equal amounts they producewhite light as Figure 28 shows Mixing the primary colors indifferent proportions can produce the colors you see

What are the primary colors of light

Paint Pigments If you were to mix equal amounts of redgreen and blue paint would you get white paint If mixing col-ors of paint were like mixing colors of light you would but mix-ing paint is different Paints are made with pigments Pigmentsproduce color as a result of the wavelengths of light they reflectPaint pigments usually are made of chemical compounds suchas titanium oxide a bright white pigment and lead chromatewhich is used for painting yellow lines on highways

Figure 28 White light is pro-

duced when the three primary col-

ors of light are mixed in equal

amounts

Color for PhotosynthesisPlant pigments determinethe wavelengths oflight for photosynthesisLeaves usually look greenbecause of the pigmentchlorophyll Chlorophyllabsorbs most wave-lengths of visible lightexcept green which itreflects However not allplants are green Researchdifferent plant pigmentsto find out how they allowplant species to survive indiverse habitats

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SECTION 4 Light and Color 343

Self Check

1 Identity what colors are reflected and what colors are

absorbed if a white light shines on a red shirt

2 Discuss how the primary colors of light differ from the

primary pigment colors

3 Explain why a red apple would appear black if you

looked at it through a blue filter

4 Determine why a white fence appears to be white instead

of multicolored if all colors are present in white light

5 Think Critically Light reflected from an object passes

through a green filter then a red filter and finally a

blue filter What color will the object seem to be

Summary

Why Objects Have Color

bull The color of an object is determined by the

wavelengths of light it reflects

bull The color of a filter is the color of the light the

filter transmits

Seeing Color

bull Rod and cone cells are light-sensitive cells

found in the retina of the human eye

bull Rod cells are sensitive to dim light Cone cells

enable colors to be seen

bull There are three types of cone cells One type

responds to red light another to green light

and another to blue light

Mixing Colors

bull Red green and blue are the primary light

colors Any color of light can be created by

mixing these primary light colors

bull Any pigment color can be formed by mixing

the primary pigment colorsmdashmagenta cyan

and yellow

6 Use Percentages In the human eye there are about

120000000 rods If 90000000 rods trigger at once

what percentage of the total number of rods triggered

7 Convert Units The wavelengths of light are measured

in nanometers (nm) which equals 0000001 mm

Find the wavelength in mm of a light wave that has a

wavelength of 690 nm

Mixing Pigments You can make any pigment color by mixingdifferent amounts of the three primary pigmentsmdashmagenta(bluish red) cyan (greenish blue) and yellow In fact color print-ers use these pigments as well as black ink to make full-colorprints like the pages in this book A primary pigmentrsquos colordepends on the wavelengths of the light that it reflects Actuallypigments both absorb and reflect a range of colors in sending asingle color message to your eye For example in white lightyellow pigment appears yellow because it reflects red and greenlight but absorbs the other wavelengths of visible light The colorof a mixture of two primary pigments is determined by theprimary colors of light that both pigments reflect

Look at Figure 29 The area in the center where the colors alloverlap appears to be black because the three blended primarypigments absorb all the primary colors of light Recall that theprimary colors of light combine to produce white light They arecalled additive colors However when the primary pigment col-ors are combined they absorb all wavelengths of visible light andproduce black Because black results from the absence ofreflected light the primary pigments are called subtractive colors

Figure 29 The three primary

pigment colors appear to be black

when they are mixed

Describe how the primary pigmentcolors are similar to the primary col-ors of light

More Section Review gpesciencecom

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Design Your OwnDesign Your Own

344

Real-World ProblemWhat loud noises do you enjoy and which ones do you find annoying

Most people enjoy a music concert performed by their favorite artist or

the booming displays of fireworks on the Fourth of July Most people

enjoy these loud sounds for short periods of time However certain

other loud noises such as traffic sirens and loud talking can be

annoying Constant annoying noises are called noise pollution What

can be done to reduce noise pollution What types of barriers will best

block out noise pollution

Form a HypothesisBased on your experiences with loud noises form a hypothesis that

predicts the effectiveness of different types of barriers at blocking out

noise pollution

Test Your HypothesisMake a Plan

1 Complete the safety form

2 Decide what type of barriers or materials you will test

3 Describe exactly how you will use these materials

Goals Design an experiment

that tests the effective-

ness of various types of

barriers and materials

for blocking out noise

pollution

Test different types of

materials and barriers

to determine the best

noise blocks

Possible Materialsradio CD player horn

drum or other loud

noise source

shrubs trees concrete

walls brick walls stone

walls wooden fences

parked cars or hanging

laundry

sound meter

meterstick or metric tape

measure

Blocking NfisePollution

4 Identify the controls and variables you will use in your

experiment

5 List the steps you will use and describe each step precisely

6 Prepare a data table in your Science Journal to record your

measurements

7 Organize the steps of your experiment in logical order

Follow Your Plan

1 Ask your teacher to approve your plan and data table before

you start

2 Conduct your experiment as planned

3 Test each barrier two or three times

4 Record the results from each test in your data table in your Science Journal

Analyze Your Data1 Identify the barriers that most effectively reduced noise pollution

2 Identify the barriers that least effectively reduced noise pollution

3 Compare the effective barriers and identify common characteristics that might

explain why they reduced noise pollution

4 Compare the natural barriers you tested with the artificial barriers Which type

of barrier best reduced noise pollution

5 Compare the different types of materials the barriers were made of Which

type of material best reduced noise pollution

Conclude and Apply1 Evaluate whether your results support your hypothesis

2 Predict how your results would differ if you used a louder source of noise such

as a siren

3 Infer from your results how people living near a

busy street could reduce noise pollution

4 Identify major sources of noise pollution in or

near your home How could they be reduced

5 Research how noise pollution can be

unhealthy

LAB 345

Draw a poster illustrating how builders and

landscapers could use certain materials to

better insulate a home or office from excess

noise pollution

346 CHAPTER 11 Sound and Light

A Haiku GardenThe Four Seasons in Poems and Prints

by Stephen Addiss with Fumiko and Akira Yamamoto

Respond to the Reading1 How do the illustrations help the reader

better understand the poems2 What do you think is meant by the

word lingering in the Haiku about springsunlight

3 Linking Science and Writing Writeone haiku about summer and anotherabout fall In one poem use color tohelp you describe the season In theother use light or some property oflight to help describe the season

Research has deter-mined that there is a

connection between color and mood Warmcolors have longer wavelengths and can bemore stimulating Cool colors which haveshorter wavelengths tend to have a calmingor soothing effect on people Light and colorhave long been used as literary symbols Doesthe use of color change what you imaginewhen you read the haiku

UnderstandingLiteratureJapanese Haiku A haiku is a verse thatconsists of three lines and 17 syllables inthe Japanese language The first and thirdlines have five syllables each and themiddle line has seven syllables Why isimagination important in reading haiku

Lingering

in every pool of watermdash

spring sunlightIssa

Withered by winter

the sound of the windmdash

one-color worldBasho

Sound

1 Sound waves are compressional waves thattravel only in matter

2 The speed of sound in a material dependson the type of material as well as itstemperature

3 Loudness depends on a sound waversquos inten-sity Pitch depends on a sound waversquosfrequency

4 Sound waves are used in echolocationsonar and medical imaging

Reflection and Refractionof Light

1 Light can be absorbed reflected or trans-mitted by a material

2 When light waves are reflected theyobey the law of reflectionmdashthe angle ofincidence equals the angle of reflection

3 A light wave is refracted or bent whenit changes speed as it travels at an anglefrom one material to another

Mirrors Lenses andthe Eye

1 Plane mirrors form upright virtual images

2 Images formed by concave mirrors andconvex lenses depend on the location ofthe object relative to the focal point

3 Convex mirrors and concave lenses formvirtual upright images that are smallerthan the object

4 The lens in the human eye changes shape toproduce a sharp image on the retina

Light and Color

1 You see color when light is reflected offobjects and into your eyes

2 Cone cells in the retina are light-sensitivecells that enable you to distinguish colors

3 Red blue and green are the three primarycolors of light and can be mixed to form allother colors

4 The primary pigment colors are magentacyan and yellow

CHAPTER STUDY GUIDE 347

Use the Foldable you made at the beginningof the chapter to help you review sound and light

Interactive Tutor gpesciencecom

Complete each statement with the correctvocabulary word or phrase

1 A change in frequency due to a movingsound source is due to the

2 A flat smooth surface that reflects light andforms an image is a(n)

3 An object is if you can seethrough it clearly

4 The of a material indicates howmuch the speed of light in the materialchanges as light passes through

5 You can change the color of white paint byadding a(n) to it

6 A(n) is a reflecting surface thatcurves outward like the back of a spoon

7 The human perception of the intensity of asound wave is

Choose the word or phrase that best answerseach question

8 Which of the following best describes imageformation by a plane mirrorA) A real image is formed in front of the mirrorB) A real image is formed behind the mirrorC) A virtual image is formed in front of the

mirrorD) A virtual image is formed behind the mirror

9 For a sound with low pitch what else isalso always lowA) amplitude C) wavelengthB) frequency D) wave velocity

10 Which of the following occurs when asound source moves away from youA) The soundrsquos velocity decreasesB) The soundrsquos loudness increasesC) The soundrsquos frequency decreasesD) The soundrsquos frequency increases

Use the table below to answer question 11

11 Based on the data in the table abovewhich of the following would be the speedof sound in air at 30degCA) 3404 ms C) 3494 msB) 3464 ms D) 3534 ms

12 What happens to a light ray travelingparallel to the optical axis of a convexlens that passes through the lensA) It travels parallel to the optical axisB) It passes through the focal pointC) It is bent away from the optical axisD) It forms a virtual image

13 Light waves of which color are bent mostwhen passing through a prismA) blue C) violetB) red D) yellow

14 Which way does a concave lens bend lightA) toward its optical axisB) toward its centerC) toward its edgesD) toward its focal point

Speed of Sound in Air

Temp peed( s)

4

4

4

348 CHAPTER REVIEW

concave lens p 335concave mirror p 332convex lens p 333convex mirror p 333decibel p 322Doppler effect p 323index of refraction p 329intensity p 322

loudness p 322opaque p 327pigment p 342pitch p 323plane mirror p 331translucent p 327transparent p 327

Vocabulary PuzzleMaker gpesciencecom

Use the illustration below to answer question 15

15 Describe how the position of the candlechanged if the image of the candle movedaway from the focal point

16 Apply Acoustic scientists sometimes doresearch in rooms that absorb all soundwaves How could such a room be used tostudy how bats find their food

17 Compare White light passes through atranslucent pane of glass and shines on ashirt Both the translucent glass and theshirt appear green Compare the colors oflight that are absorbed and transmitted bythe glass and the shirt

18 Infer Most mammals including dogs andcats canrsquot see colors Infer how the retinaof a catrsquos eye might be different from theretina of a human eye

19 Determine whether a convex lens could forman image that is enlarged real and upright

20 Infer A car comes to a railroad crossingThe driver hears a trainrsquos whistle and itspitch becomes lower What can beassumed about how the train is moving

21 Compare and contrast the reflection of lightfrom a white wall with a rough surfacewith the reflection of light from a mirror

Optical axis

One

focal

length

Two

focal

lengths

Image

Ray A

Object

Focal

point

Interpreting Graphics 22 Infer why a convex mirror and a concavelens can never produce a real image

23 Predict what color a white shirt wouldappear to be if the light reflected from theshirt passed through a red filter and thenthrough a green filter

24 Explain why windows might begin to rattlewhen an airplane flies overhead

25 Communicate Some people enjoy usingsnowmobiles Others object to the noisethat they make Write a proposal for a pol-icy that seems fair to both groups for theuse of snowmobiles in a state park

CHAPTER REVIEW 349

Use the wave speed equation ν ƒλ to answer

questions 26 and 27

26 Calculate Frequency A sonar pulse has awavelength of 30 cm and a speed inwater of 1500 ms Find its frequency

27 Calculate Wavelength What is the wave-length of a sound wave with a fre-quency of 440 Hz if the speed of soundin air is 340 ms

28 Calculate Angle of Incidence A light ray isreflected from a mirror If the anglebetween the incident ray and thereflected ray is 136deg what is the angleof incidence

29 Determine Object Distance You hold anobject in front of a concave mirror witha focal length of 30 cm If you do notsee a reflected image how far from themirror is the object

30 Calculate Speed The speed of light in avacuum is 300000 kms If the index ofrefraction of water is 133 what is thespeed of light in water

More Chapter Review gpesciencecom

1 Which of the following describes the imageformed by a convex mirror

A enlarged

B inverted

C real

D virtual

Use the figure below to answer question 2

2 Which of the following describes a light raythat passes through the focal point andthen is reflected by the mirror

A It travels parallel to the optical axis

B It forms a real image

C It is reflected back through the focal point

D It forms a virtual image

3 Why does an apple look red

A It reflects red light

B It absorbs red light

C It reflects green and blue light

D It reflects all colors of light except red

Use the figure below to answer questions 4 and 5

4 When the primary colors of light are addedtogether what color appears in area H

A cyan

B magenta

C white

D yellow

5 When the primary colors of light are addedtogether what color appears in area G

A cyan

B magenta

C white

D yellow

6 Which of the following increases as the fre-quency of a sound increases

A amplitude

B intensity

C loudness

D pitch

Red Blue

Green

F

H

G K

Focal pointOptical axis

350 STANDARDIZED TEST PRACTICE

Record your answers on the answer sheet provided by your teacher or on a sheet of paper

STANDARDIZED TEST PRACTICE 351

7 Which of the following parts of the eyeenable you to see colors in bright light

A cone cells

B cornea

C lens

D rod cells

Use the graph below to answer questions 8 and 9

8 Determine how far in centimeters theimage is from the lens when the object is15 centimeters from the lens

9 How far in centimeters is the object fromthe lens when the image distance andobject distance are equal

10 A shirt has stripes that are black and whitein white light If green light shines on thisshirt what colors will the black and whitestripes be

11 If you are on a moving train what hap-pens to the pitch of a crossing bell as youapproach the crossing and then moveaway from the crossing

Use the figure below to answer question 12

12 Describe the vision problem show by thefigure and explain how this vision prob-lem can be corrected

13 Explain why the human eye can see colorsbetter in bright light than in dim light

Image Distance fora Convex Lens

Ima

ge

dis

tan

ce (

cm)

30

25

20

15

10

5 10 15 20 25 30

Object distance (cm)

Standardized Test Practice gpesciencecom

Note Units Read carefully and make note of the units used in

any measurement

  • Glencoe Physical Science with Earth Science
    • Student Edition Table of Contents
      • Unit 1 Science and Technology
        • Chapter 1 The Nature of Science
          • Launch Lab Understanding Measurements
          • Foldables
          • Section 1 The Methods of Science
            • Science Online
            • Integrate History
            • Integrate Earth Science
            • Science Online
              • Section 2 Standards of Measurement
                • Applying Math Centimeters
                • Integrate Earth Science
                • Science Online
                • MiniLAB Determining the Density of a Pencil
                • Visualizing SI Dimensions
                  • Section 3 Communicating with Graphs
                    • Applying Math Temperature
                    • MiniLAB Graphing Temperature Change
                    • Lab Whats my graph
                    • Lab Design Your Own - Developing a Measurement System
                    • Science and Language Arts Thinking in Pictures and Other Reports from My Life with Autism
                      • Chapter 1 Study Guide
                      • Chapter 1 Review
                      • Chapter 1 Standardized Test Practice
                        • Chapter 2 Science Technology and Society
                          • Lab Technology in Your Life
                          • Foldables
                          • Section 1 Science and Technology
                            • MiniLAB Researching the Past
                            • Visualizing Technology Supplying Basic Needs
                            • Science Online
                              • Section 2 Forces that Shape Technology
                                • MiniLAB Evaluating the Benefits and Consequences of Technology
                                • Integrate Environment
                                • Integrate History
                                • Applying Science What impact does the accident at Chernobyl have on the future of nuclear power
                                • Science Online
                                • Lab Who contributes CO2
                                  • Section 3 Developing Technology
                                    • Integrate Life Science
                                    • Integrate Career
                                    • Lab Model and Invent - Care Package
                                    • Oops Accidents in Science A Slippery Situation
                                      • Chapter 2 Study Guide
                                      • Chapter 2 Review
                                      • Chapter 2 Standardized Test Practice
                                          • Unit 2 Motion Forces and Energy
                                            • Chapter 3 Motion Acceleration and Forces
                                              • Launch Lab Compare Speeds
                                              • Foldables
                                              • Section 1 Describing Motion
                                                • MiniLAB Measuring Average Speed
                                                • Science Online
                                                • Applying Math Average Speed
                                                • Integrate Astronomy
                                                • Science Online
                                                  • Section 2 Acceleration
                                                    • Integrate History
                                                    • Visualizing Acceleration
                                                      • Section 3 Motion and Forces
                                                        • Science Online
                                                        • MiniLAB Comparing Friction
                                                        • Lab Force and Acceleration
                                                        • Lab Design Your Own - Comparing Motion from Different Forces
                                                        • Science and Language Arts A Brave and Startling Truth
                                                          • Chapter 3 Study Guide
                                                          • Chapter 3 Review
                                                          • Chapter 3 Standardized Test Practice
                                                            • Chapter 4 The Laws of Motion
                                                              • Launch Lab The Force of Gravity
                                                              • Foldables
                                                              • Section 1 The First Two Laws of Motion
                                                                • MiniLAB Observing Inertia
                                                                • Science Online
                                                                • Applying Math The Acceleration of a Sled Solve a Simple Equation
                                                                  • Section 2 Gravity
                                                                    • Science Online
                                                                    • Integrate Earth Science
                                                                    • MiniLAB Observing Centripetal Force
                                                                    • Lab Gravity and Air Resistance
                                                                      • Section 3 The Third Law of Motion
                                                                        • Integrate Career
                                                                        • Visualizing Rocket Motion
                                                                        • Applying Math The Momentum of a Sprinter
                                                                        • Lab The Momentum of Colliding Objects
                                                                        • Science and History Newton and the Plague
                                                                          • Chapter 4 Study Guide
                                                                          • Chapter 4 Review
                                                                          • Chapter 4 Standardized Test Practice
                                                                            • Chapter 5 Energy
                                                                              • Launch Lab Energy Conversions
                                                                              • Foldables
                                                                              • Section 1 The Nature of Energy
                                                                                • Science Online
                                                                                • Applying Math Kinetic Energy
                                                                                • MiniLAB Interpreting Data from a Slingshot
                                                                                • Integrate Language Arts
                                                                                • Applying Math Gravitational Potential Energy
                                                                                • Lab Bouncing Balls
                                                                                  • Section 2 Conservation of Energy
                                                                                    • Visualizing Energy Transformations
                                                                                    • Integrate Environment
                                                                                    • MiniLAB Transforming Energy in a Paper Clip
                                                                                    • Science Online
                                                                                    • Integrate Health
                                                                                    • Lab Design Your Own - Swinging Energy
                                                                                    • Science and History The Impossible Dream
                                                                                      • Chapter 5 Study Guide
                                                                                      • Chapter 5 Review
                                                                                      • Chapter 5 Standardized Test Practice
                                                                                        • Chapter 6 Work and Machines
                                                                                          • Launch Lab Doing Work with a Simple Machine
                                                                                          • Foldables
                                                                                          • Section 1 Work
                                                                                            • Integrate Language Arts
                                                                                            • Applying Math Work
                                                                                            • MiniLAB Calculating Your Work and Power
                                                                                            • Applying Math Power
                                                                                              • Section 2 Using Machines
                                                                                                • MiniLAB Machines Multiplying Force
                                                                                                • Science Online
                                                                                                • Integrate Chemistry
                                                                                                  • Section 3 Simple Machines
                                                                                                    • Integrate History
                                                                                                    • Visualizing Levers in the Human Body
                                                                                                    • Science Online
                                                                                                    • Lab Levers
                                                                                                    • Lab Model and Invent - Using Simple Machines
                                                                                                    • Science and Society The Science of Very Very Small
                                                                                                      • Chapter 6 Study Guide
                                                                                                      • Chapter 6 Review
                                                                                                      • Chapter 6 Standardized Test Practice
                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                          • Launch Lab Relative Sizes of Earth the Moon and the Sun
                                                                                                          • Foldables
                                                                                                          • Section 1 Earth in Space
                                                                                                            • Science Online
                                                                                                            • Integrate Physics
                                                                                                              • Section 2 Time and Seasons
                                                                                                                • MiniLAB Modeling the Suns Rays at Solstice
                                                                                                                • Lab Comparing the Angle of Sunlight to Intensity
                                                                                                                  • Section 3 Earths Moon
                                                                                                                    • Applying Math Tides
                                                                                                                    • MiniLAB Modeling Phases and Eclipses
                                                                                                                    • Integrate History
                                                                                                                    • Integrate History
                                                                                                                    • Science Online
                                                                                                                    • Visualizing Water on the Moon
                                                                                                                    • Lab Identifying the Moons Surface Features and Apollo Landing Sites
                                                                                                                    • Oops Accidents in Science Even Great Scientists Make Mistakes
                                                                                                                      • Chapter 7 Study Guide
                                                                                                                      • Chapter 7 Review
                                                                                                                      • Chapter 7 Standardized Test Practice
                                                                                                                        • Chapter 8 The Solar System
                                                                                                                          • Launch Lab The Size of the Solar System
                                                                                                                          • Foldables
                                                                                                                          • Section 1 Planet Motion
                                                                                                                            • Integrate History
                                                                                                                            • MiniLAB Plotting Retrograde Motion
                                                                                                                            • Integrate Physics
                                                                                                                            • Applying Math Heliocentric Longitude (HL)
                                                                                                                              • Section 2 The Inner Planets
                                                                                                                                • Science Online
                                                                                                                                • Integrate Chemistry
                                                                                                                                • Lab Interpreting Features of Marss Surface
                                                                                                                                  • Section 3 The Outer Planets
                                                                                                                                    • Integrate Language Arts
                                                                                                                                    • Visualizing What Galileo Saw
                                                                                                                                    • Science Online
                                                                                                                                    • MiniLAB Comparing Sizes of Outer and Inner Planets
                                                                                                                                      • Section 4 Life in the Solar System
                                                                                                                                        • Lab Design Your Own - Testing Unknown Soil Samples for Life
                                                                                                                                        • Science Stats Night Sky Wonders
                                                                                                                                          • Chapter 8 Study Guide
                                                                                                                                          • Chapter 8 Review
                                                                                                                                          • Chapter 8 Standardized Test Practice
                                                                                                                                              • Unit 3 Energy in Motion
                                                                                                                                                • Chapter 9 Heat and States of Matter
                                                                                                                                                  • Launch Lab Expansion of a Gas
                                                                                                                                                  • Foldables
                                                                                                                                                  • Section 1 Temperature and Thermal Energy
                                                                                                                                                    • Applying Math Converting to Celsius
                                                                                                                                                    • Science Online
                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                    • Applying Math Change in Thermal Energy
                                                                                                                                                      • Section 2 States of Matter
                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                        • Science Online
                                                                                                                                                        • MiniLAB Comparing States of Water
                                                                                                                                                          • Section 3 Transferring Thermal Energy
                                                                                                                                                            • MiniLAB Comparing Thermal Conductors
                                                                                                                                                            • Visualizing Convection Currents
                                                                                                                                                            • Lab Convection in Gases and Liquids
                                                                                                                                                              • Section 4 Using Thermal Energy
                                                                                                                                                                • Integrate History
                                                                                                                                                                • Science Online
                                                                                                                                                                • Lab Conduction in Gases
                                                                                                                                                                • Science Stats Surprising Thermal Energy
                                                                                                                                                                  • Chapter 9 Study Guide
                                                                                                                                                                  • Chapter 9 Review
                                                                                                                                                                  • Chapter 9 Standardized Test Practice
                                                                                                                                                                    • Chapter 10 Waves
                                                                                                                                                                      • Launch Lab How do waves transfer energy
                                                                                                                                                                      • Foldables
                                                                                                                                                                      • Section 1 The Nature of Waves
                                                                                                                                                                        • Visualizing Formation of Ocean Waves
                                                                                                                                                                        • Science Online
                                                                                                                                                                          • Section 2 Wave Properties
                                                                                                                                                                            • MiniLAB Observing Wavelength
                                                                                                                                                                            • Integrate Social Studies
                                                                                                                                                                            • Applying Math The Speed of Sound
                                                                                                                                                                            • Lab Wave Speed and Tension
                                                                                                                                                                              • Section 3 The Behavior of Waves
                                                                                                                                                                                • Science Online
                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                • MiniLAB Experimenting with Resonance
                                                                                                                                                                                • Lab Measuring Wave Properties
                                                                                                                                                                                • Science and History Making Waves
                                                                                                                                                                                  • Chapter 10 Study Guide
                                                                                                                                                                                  • Chapter 10 Review
                                                                                                                                                                                  • Chapter 10 Standardized Test Practice
                                                                                                                                                                                    • Chapter 11 Sound and Light
                                                                                                                                                                                      • Launch Lab What sound does a ruler make
                                                                                                                                                                                      • Foldables
                                                                                                                                                                                      • Section 1 Sound
                                                                                                                                                                                        • MiniLAB Comparing Intensity
                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                        • Science Online
                                                                                                                                                                                        • Applying Math Using Sonar
                                                                                                                                                                                          • Section 2 Reflection and Refraction of Light
                                                                                                                                                                                          • Section 3 Mirrors Lenses and the Eye
                                                                                                                                                                                            • Visualizing Images Formed by a Convex Lens
                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                            • MiniLAB Experimenting with Focal Lengths
                                                                                                                                                                                            • Lab Reflections of Reflections
                                                                                                                                                                                              • Section 4 Light and Color
                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Lab Design Your Own - Blocking Noise Pollution
                                                                                                                                                                                                • Science and Language Arts A Haiku Garden The Four Seasons in Poems and Print
                                                                                                                                                                                                  • Chapter 11 Study Guide
                                                                                                                                                                                                  • Chapter 11 Review
                                                                                                                                                                                                  • Chapter 11 Standardized Test Practice
                                                                                                                                                                                                    • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                      • Launch Lab Global Jigsaw Puzzle
                                                                                                                                                                                                      • Foldables
                                                                                                                                                                                                      • Section 1 Evolution of Earths Crust
                                                                                                                                                                                                        • Applying Math Spreading Distances
                                                                                                                                                                                                        • Integrate Physics
                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                          • Section 2 Earthquakes
                                                                                                                                                                                                            • MiniLAB Demonstrating Four Types of Stress
                                                                                                                                                                                                            • Visualizing Earthquake-Proof Buildings
                                                                                                                                                                                                              • Section 3 Earths Interior
                                                                                                                                                                                                              • Section 4 Volcanoes
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • MiniLAB Modeling Lava Viscosity
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                • Lab A Case for Pacific Plate Motion
                                                                                                                                                                                                                • Lab Earthquake Earthquake Wheres the earthquake
                                                                                                                                                                                                                • Science and History Volcano Weather
                                                                                                                                                                                                                  • Chapter 12 Study Guide
                                                                                                                                                                                                                  • Chapter 12 Review
                                                                                                                                                                                                                  • Chapter 12 Standardized Test Practice
                                                                                                                                                                                                                      • Unit 4 Forms of Energy
                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                          • Launch Lab Electric Circuits
                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                          • Section 1 Electric Charge
                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                            • Visualizing Lightning
                                                                                                                                                                                                                            • MiniLAB Investigate Charged Objects
                                                                                                                                                                                                                              • Section 2 Electric Current
                                                                                                                                                                                                                                • MiniLAB Investigating Battery Addition
                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                • Lab Identifying Conductors and Insulators
                                                                                                                                                                                                                                  • Section 3 Electrical Energy
                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                    • Applying Math Power Used by a Clothes Dryer
                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                    • Applying Math Electrical Energy Used by a Microwave Oven
                                                                                                                                                                                                                                    • Lab Design Your Own - Comparing Series and Parallel Circuits
                                                                                                                                                                                                                                    • Science and Language Arts Invisible Man
                                                                                                                                                                                                                                      • Chapter 13 Study Guide
                                                                                                                                                                                                                                      • Chapter 13 Review
                                                                                                                                                                                                                                      • Chapter 13 Standardized Test Practice
                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                          • Launch Lab The Strength of Magnets
                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                          • Section 1 Magnetism
                                                                                                                                                                                                                                            • MiniLAB Observing Magnetic Interference
                                                                                                                                                                                                                                            • Integrate Earth Science
                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                            • Applying Science How can magnetic parts of a junk car be salvaged
                                                                                                                                                                                                                                            • MiniLAB Making Your Own Compass
                                                                                                                                                                                                                                              • Section 2 Electricity and Magnetism
                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                  • Section 3 Producing Electric Current
                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                    • Visualizing Motors and Generators
                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                    • Lab Electricity and Magnetism
                                                                                                                                                                                                                                                    • Lab Design Your Own - Controlling Electromagnets
                                                                                                                                                                                                                                                    • Science and History Body Art
                                                                                                                                                                                                                                                      • Chapter 14 Study Guide
                                                                                                                                                                                                                                                      • Chapter 14 Review
                                                                                                                                                                                                                                                      • Chapter 14 Standardized Test Practice
                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                          • Launch Lab Can electromagnetic waves change materials
                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                          • Section 1 What are electromagnetic waves
                                                                                                                                                                                                                                                            • MiniLAB Investigating Electromagnetic Waves
                                                                                                                                                                                                                                                            • Applying Math The Speed of Light in Water
                                                                                                                                                                                                                                                              • Section 2 The Electromagnetic Spectrum
                                                                                                                                                                                                                                                                • MiniLAB Heating with Microwaves
                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                • Lab The Shape of Satellite Dishes
                                                                                                                                                                                                                                                                  • Section 3 Radio Communication
                                                                                                                                                                                                                                                                    • Visualizing Radio Broadcasts
                                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Lab Use the Internet - Radio Frequencies
                                                                                                                                                                                                                                                                    • Science and History Riding a Beam of Light
                                                                                                                                                                                                                                                                      • Chapter 15 Study Guide
                                                                                                                                                                                                                                                                      • Chapter 15 Review
                                                                                                                                                                                                                                                                      • Chapter 15 Standardized Test Practice
                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                          • Launch Lab Heating with Solar Energy
                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                          • Section 1 Fossil Fuels
                                                                                                                                                                                                                                                                            • Visualizing The Formation of Fossil Fuels
                                                                                                                                                                                                                                                                            • MiniLAB Designing an Efficient Water Heater
                                                                                                                                                                                                                                                                              • Section 2 Nuclear Energy
                                                                                                                                                                                                                                                                                • Integrate Earth Science
                                                                                                                                                                                                                                                                                • Integrate Social Science
                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                • Applying Science Can a contaminated radioactive site be reclaimed
                                                                                                                                                                                                                                                                                  • Section 3 Renewable Energy Sources
                                                                                                                                                                                                                                                                                    • MiniLAB Using Solar Power at Home
                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                    • Lab Solar Heating
                                                                                                                                                                                                                                                                                    • Lab Use the Internet How much does energy really cost
                                                                                                                                                                                                                                                                                    • Science and Society Reacting to Nuclear Energy
                                                                                                                                                                                                                                                                                      • Chapter 16 Study Guide
                                                                                                                                                                                                                                                                                      • Chapter 16 Review
                                                                                                                                                                                                                                                                                      • Chapter 16 Standardized Test Practice
                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                          • Lab Atmospheric Pressure
                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                          • Section 1 Earths Atmosphere
                                                                                                                                                                                                                                                                                            • MiniLAB Visualizing Convection
                                                                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                                                                            • Lab Visualizing a Temperature Inversion
                                                                                                                                                                                                                                                                                              • Section 2 Weather
                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Coriolis Effect
                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                  • Section 3 Climate
                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                    • Visualizing Earths Biogeophysical System
                                                                                                                                                                                                                                                                                                      • Section 4 Earths Changing Climates
                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                        • Applying Math Carbon Dioxide (CO2) Concentration
                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Investigating Microclimate
                                                                                                                                                                                                                                                                                                        • Science and Language Arts The Grapes of Wrath
                                                                                                                                                                                                                                                                                                          • Chapter 17 Study Guide
                                                                                                                                                                                                                                                                                                          • Chapter 17 Review
                                                                                                                                                                                                                                                                                                          • Chapter 17 Standardized Test Practice
                                                                                                                                                                                                                                                                                                              • Unit 5 Matter and Earth Materials
                                                                                                                                                                                                                                                                                                                • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                  • Launch Lab Demonstrate the Distillation of Water
                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                  • Section 1 Composition of Matter
                                                                                                                                                                                                                                                                                                                    • Visualizing Elements
                                                                                                                                                                                                                                                                                                                    • MiniLAB Classifying Materials
                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                    • Lab Comparing Pure Substances and Mixtures
                                                                                                                                                                                                                                                                                                                      • Section 2 Properties of Matter
                                                                                                                                                                                                                                                                                                                        • Integrate Environment
                                                                                                                                                                                                                                                                                                                        • MiniLAB Separating Ink
                                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                                        • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                        • Applying Math The Law of Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Measuring the Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Science Stats Intriguing Elements
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Study Guide
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Review
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                            • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                              • Launch Lab Inferring What You Cant Observe
                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                              • Section 1 Structure of the Atom
                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling an Aluminum Atom
                                                                                                                                                                                                                                                                                                                                • Visualizing The Atomic Model
                                                                                                                                                                                                                                                                                                                                  • Section 2 Masses of Atoms
                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                    • Applying Science How can radioactive isotopes help tell time
                                                                                                                                                                                                                                                                                                                                      • Section 3 The Periodic Table
                                                                                                                                                                                                                                                                                                                                        • MiniLAB Organizing a Personal Periodic Table
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Career
                                                                                                                                                                                                                                                                                                                                        • Science Online
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                                                                                                                                                                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                                                                                                                                                                        • Lab A Periodic Table of Foods
                                                                                                                                                                                                                                                                                                                                        • Lab Use the Internet Whats in a name
                                                                                                                                                                                                                                                                                                                                        • Science and History A Chilling Story
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Study Guide
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Review
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                            • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                              • Launch Lab Earth Materials at Home and School
                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                              • Section 1 Minerals
                                                                                                                                                                                                                                                                                                                                                • MiniLAB Identifying Salts Crystal System
                                                                                                                                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                • Lab Be a Mineral Detective
                                                                                                                                                                                                                                                                                                                                                  • Section 2 Igneous Rocks
                                                                                                                                                                                                                                                                                                                                                    • Applying Math Extrusive Igneous Rock Classification
                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                      • Section 3 Sedimentary Rocks
                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Evaporites
                                                                                                                                                                                                                                                                                                                                                          • Section 4 Metamorphic Rocks and the Rock Cycle
                                                                                                                                                                                                                                                                                                                                                            • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                            • Visualizing Shock Metamorphic Rock
                                                                                                                                                                                                                                                                                                                                                            • Lab Identifying Rocks
                                                                                                                                                                                                                                                                                                                                                            • Science and Society Earth Materials at Work
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Study Guide
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Review
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                  • Launch Lab Have you got the time
                                                                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                                                                  • Section 1 Weathering and Soil
                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing a Disappearing Seasoning
                                                                                                                                                                                                                                                                                                                                                                    • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                    • Lab Graphing Soil Textures
                                                                                                                                                                                                                                                                                                                                                                      • Section 2 Shaping the Landscape
                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Runoff
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                          • Section 3 Groundwater
                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Porosity Volume
                                                                                                                                                                                                                                                                                                                                                                            • Visualizing The Role of Groundwater in Shaping Earths Surface
                                                                                                                                                                                                                                                                                                                                                                            • Integrate Environment
                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                              • Section 4 Geologic Time
                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                                                                                                • Lab Its about time - relative that is
                                                                                                                                                                                                                                                                                                                                                                                • Science and Society Tapping into the Underground
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Review
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                      • Unit 6 Interactions of Matter
                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                          • Lab Chemical Bonds and Mixing
                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Stability in Bonding
                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                            • Lab Atomic Trading Cards
                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Types of Bonds
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Observing a Bond Type
                                                                                                                                                                                                                                                                                                                                                                                                • Visualizing Polar Molecules
                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Writing Formulas and Naming Compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math Determining a Formula
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Science Can you name binary ionic compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Making a Hydrate
                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Model and Invent - Modeling Chemical Bonding
                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Sticky Subject
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Study Guide
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                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab RustingmdashA Chemical Reaction
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                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Chemical Changes
                                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Designing a Team Equation
                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Chemical Equations
                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math Barium Sulfate Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Classifying Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 4 Reaction Rates and Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing Chemical Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Creating a Colorful Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab To Glow or Not to Glow
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Investigating Reaction Conditions
                                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Clumsy Move Pays Off
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Study Guide
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                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab Magic Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 How Solutions Form
                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                                                                                                                                                                                                                                                            • Visualizing Metal Alloys
                                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Observing the Effect of Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Solubility and Concentration
                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Acids Bases and Salts
                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing Acid Relief
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Strength of Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Determining Acidity
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Saturated Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and Society Acid Rain
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Study Guide
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                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab The Size of a Nucleus
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Strong Force
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Nuclear Decay
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Detecting Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math The Age of Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Social Studies
                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Nuclear Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling a Nuclear Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Visualizing PET Scans
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Chain Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Model and Invent Modeling Transmutations
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and History The Nuclear Alchemist
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Study Guide
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                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Observing the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling a Telescope
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math The Magnifying Power of Telescopes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Evolution of Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Counting Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing H-R Diagrams of Star Clusters
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Star Cluster Age
                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 3 Galaxies and the Milky Way
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 12 Earths Internal Processes
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Page 12: 706 S1 318-326 GPS09 - Light-and-Sound - home · PDF fileWhat sound does a ruler make? ... sound waves cannot travel in empty space where there are no particles. ... sound travels

Refraction of LightWhat occurs when a light wave passes from one material to

anothermdashfrom air to water for example Recall that refractionis caused by a change in the speed of a wave when it passes fromone material to another If the light wave is traveling at an angleto the boundary between the materials and the speed of light isdifferent in the two materials the wave will be bent or refracted

Why does refraction occur

The Index of Refraction The amount of bending that takesplace depends on the speeds of light in both materials Thegreater the change in speed the more the light will be bent asit passes at an angle from one material to the other Figure 11

shows an example of refraction Every material has an index ofrefraction which is the ratio of the speed of light in a vacuum tothe speed of light in the material The index of refraction indi-cates how much the speed of light is reduced in the materialcompared to its speed in empty space

The larger the index of refraction the more light is sloweddown in the material For example because glass has a largerindex of refraction than air light moves more slowly in glassthan air The index of refraction is usually largest for solids andsmallest for gases

Prisms A sparkling glass prism hangs in a sunny windowrefracting the sunlight and projecting a colorful pattern onto thewalls of the room How does the refraction of light create thesecolors The spectrum of colors is produced because the speed oflight in a material also depends on the wave-length of the light In a glass prism light waveswith longer wavelengths such as red light wavesare slowed less than light waves with shorterwavelengths such as blue light waves

Figure 12 shows what occurs when whitelight passes through a prism White light suchas sunlight is made up of light waves withrange of wavelengths from red to blue The tri-angular prism refracts the light twicemdashoncewhen it enters the prism and again when itleaves the prism and reenters the air Becausethe longer wavelengths of light are slowed lessthan the shorter wavelengths are red light isbent the least As a result of these differentamounts of bending the different colors areseparated when they emerge from the prism

Figure 11 The spoon looks

broken because light waves are

refracted as they change speed

when they pass from the water to

the air

329

Figure 12 Refraction causes a

prism to separate a beam of white

light into different colors

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330 CHAPTER 11 Sound and Light

Self Check

1 Compare and contrast opaque transparent and

translucent materials Give one example of each

2 Discuss why you can see your reflection in a smooth

piece of aluminum foil but not in a crumpled ball of foil

3 Infer what happens to light waves that are reflected off

dust particles in the air

4 Explain what happens to white light when it passes

through a prism

5 Think Critically Suppose a material has the same index

of refraction as water How would a light wave change

direction as it traveled from water into this material

Summary

Light and Matter

bull The amount of light that is absorbed

reflected or transmitted depends on the

material making up the object

Reflection of Light

bull Light waves always obey the law of reflection

the angle of incidence equals the angle of

reflection

bull Regular reflection causes parallel light waves

to be reflected in only one direction

bull Diffuse reflection causes parallel light waves

to be reflected in many directions

bull Scattering occurs when light waves are reflected

and travel in many different directions

Refraction of Light

bull Refraction occurs when a light wave changes

speed in moving from one material to another

bull The index of refraction of a material indicates

how much light slows down in the material

6 Find an Angle A light wave strikes a mirror at an

angle of 42deg from the surface of the mirror What

angle does the reflected wave make with the normal

7 Find an Angle A light wave reflects from a mirror at

27deg from the normal What was the angle between

the mirror and the incident wave

Mirages When yoursquore traveling in a car you might see whatlooks like a pool of water on the road ahead As you get closerthe water seems to disappear Yoursquove seen a miragemdashan image ofa distant object produced by the refraction of light through airlayers of different densities Mirages result when the air atground level is much warmer or cooler than the air above asshown in Figure 13 The density of air increases as air cools andlight waves move slower in cooler air than in warmer air As aresult light waves are refracted as they pass through air layerswith different temperatures

Figure 13 Mirages result when

air near the ground is much

warmer or cooler than the air

above This causes light waves

reflected from an object to refract

creating one or more additional

images

MirageWarm air

Cool air

More Section Review gpesciencecom

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SECTION 3 Mirrors Lenses and the Eye 331

Light RaysLight sources send out light waves in all directions These

waves spread out like ripples on the surface of water spread outfrom the point of impact of a pebble You can think of the lightcoming from the source as being many narrow beams of light trav-eling in all directions Each narrow light beam is called a light ray

MirrorsA mirror is any surface that produces a regular reflection A pool

of still water a metal pan and even the back of a shiny spoon can bemirrors Mirrors can be flat curved inward or curved outward

Plane Mirrors A flat smooth mirror is a plane mirror Whenyou look in a plane mirror your image appears upright If youstand 1 m from the mirror your image appears 1 m behind themirror or 2 m from you In fact your image is what a friend stand-ing 2 m from you would see Figure 14 shows how your image isformed First light rays from a light source strike you Every pointthat is struck by the light rays reflects these rays so they travel out-ward in all directions If your friend were looking at you thesereflected light rays coming from you would enter her eyes so shecould see you However if a mirror is placed between you and yourfriend light rays are reflected from the mirror back to your eyes

Mirrors Lenses andthe Eye

Reading Guide

Describe how images are formed

by three types of mirrors Explain how convex and concave

lenses form images Explain how the human eye

enables you to see Describe how lenses are used to

correct vision problems

Mirrors and lenses are used in optical

instruments such as cameras and

telescopes

Review Vocabulary

reflection the process of changing

direction after striking a surface

New Vocabulary

bull plane mirror

bull concave mirror

bull convex mirror

bull convex lens

bull concave lens

Figure 14 Seeing an image of

yourself in a mirror involves two

sets of reflections light rays are

reflected from you and then are

reflected by the mirror

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332 CHAPTER 11 Sound and Light

Virtual and Real Images The forma-tion of an image by a plane mirror isshown in Figure 15 Your brain assumesthat light rays travel in a straight line As aresult rays that enter your eyes seem tocome from behind the mirror This makesthe image seem to be behind the mirrorHowever no light rays actually passthrough the place where the image seemsto be located This type of image is called avirtual image Plane mirrors always formvirtual images If light rays from an objectpass through the location of the image theimage is called a real image Curved mir-rors can form both real and virtual images

Concave Mirrors If the surface of a mirror is curved inwardit is called a concave mirror as shown in Figure 16 The opticalaxis is an imaginary straight line drawn perpendicular to thesurface of the mirror at its center Every light ray traveling par-allel to the optical axis is reflected through a point on the opti-cal axis called the focal point The distance from the center ofthe mirror to the focal point is called the focal length

The image formed by a concave mirror depends on the loca-tion of the object relative to the focal point Figure 16 shows acandle located more than twice the focal length from the mirrorAlthough many light rays come from each point on the candleonly two rays from the same point are shown Ray A passesthrough the focal point and then reflects off the mirror movingparallel to the optical axis Ray B travels parallel to the opticalaxis before reflecting off the mirror and passing through thefocal point The point where the two rays meet is the location ofthe image of the original point on the candle The image formedis a real image because light rays from the candle pass throughthe place where the image is located

Figure 16 Rays A and B start from the same

place on the candle travel in different directions

and meet again on the reflected image

Diagram how two other points on the image ofthe candle are formed

Figure 15 Your brain interprets

the light rays reflected by the

mirror as coming from a point

behind the mirror

Infer how the size of your imagein a plane mirror depends on yourdistance from the mirror

Focalpoint

Optical axis

Ray B

Ray A

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SECTION 3 Mirrors Lenses and the Eye 333

Images Produced by a ConcaveMirror When an object is between oneand two focal lengths from a concavemirror the image is real inverted andlarger than the object An object closerthan one focal length from a concavemirror produces a virtual image that isupright and larger than the object Noimage is produced if the object islocated at the focal point

Convex Mirrors When you are in astore look up toward one of the backcorners or at the end of an aisle to see ifa large rounded mirror is mountedthere You can see a large area of the store in such a mirror Amirror that curves outward like the back of a spoon is called aconvex mirror Light rays that hit a convex mirror diverge orspread apart after they are reflected Figure 17 shows how therays from an object are reflected by a convex mirror to form animage The reflected rays diverge and never meet so a convexmirror forms only a virtual image The image also is upright andsmaller than the actual object is

Describe the image formed by a convex mirror

LensesWhat do your eyes have in common with cameras eyeglasses

and microscopes Each of these contains at least one lens A lens is atransparent object with at least one curved surface that causes lightrays to refract The image that a lens forms depends on the shape ofthe lens Like curved mirrors lenses can be convex or concave

Convex Lenses A convex lens is thicker in the middle than atthe edges Its optical axis is an imaginary straight line that is per-pendicular to the surface of the lens at its thickest point When lightrays approach a convex lens traveling parallel to its opticalaxis the rays are refracted toward the center of the lens asin Figure 18 Light rays traveling along the optical axis arenot bent at all All light rays traveling parallel to the opti-cal axis are refracted so they pass through a single pointwhich is the focal point of the lens The less curved thesides of the lens the less light rays are bent As a resultlenses with flatter sides have longer focal lengths Figure 19

on the next page shows that convex lenses can form eitherreal or virtual images

Figure 18 Convex lenses are

thicker in the middle than at the

edges Light rays that are parallel

to the optical axis are refracted so

that they pass through the focal

point A light ray that passes

through the center of the lens is

not refracted

Figure 17 A convex mirror

forms a reduced upright virtual

image

Optical axis

Ray A

Ray B

Focallength

Focalpoint

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Figure 19

VISUALIZING IMAGES FORMED BY A CONVEX LENS

334 CHAPTER 11 Sound and Light

Aconvex lens can form images that are real or virtual enlarged or reduced and upright orinverted Just as for a concave mirror the type of image formed by a convex lens depends on thelocation of the object relative to the focal point of the lens

Optical axis

One

focal

length

Two

focal

lengthsRay B

Image

Ray A

Object

Focal

point

Optical axis

One

focal

length

Two

focal

lengths

Ray B

Ray AObject

Image

Focal

point

Optical axis

Ray B

ObjectRay A

One

focal

length

Focal

pointImage

If the object is more than two focal lengths from the lens the image formed is real inverted andsmaller than the object As the object moves farther from the lens the image becomes smaller

If the object is between one and two focal lengths from the lens the image formed is real invertedand larger than the object As the object moves closer to the focal point the image becomes larger

If the object is less than one focal length from the lens the image is virtual upright and larger thanthe object The image is virtual because the light rays from the object diverge after they pass throughthe lens The image becomes smaller as the object moves closer to the lens

SECTION 3 Mirrors Lenses and the Eye 335

Concave Lenses A concave lens is thinnerin the middle and thicker at the edges Asshown in Figure 20 light rays that passthrough a concave lens bend away from theoptical axis The rays spread out and nevermeet so a real image is never formed Theimage is always virtual upright and smallerthan the object is Concave lenses are used insome types of eyeglasses and some telescopesConcave lenses usually are used in combinationwith other lenses

What type of image is formed by a concave lens

The Human EyeWhat determines how well you can see the words on this

page If you donrsquot need eyeglasses the structure of your eye givesyou the ability to focus on these words and other objects aroundyou Look at Figure 21 Light enters your eye through a trans-parent covering on your eyeball called the cornea The corneacauses light rays to bend so that they converge The light thenpasses through an opening called the pupil Behind the pupil isa flexible convex lens Muscles attached to the lens change itsshape to help focus light forming a sharp image on your retina

The retina is the inner lining of your eye The retina con-tains light-sensitive cells that convert an image into electricalsignals These signals then are carried along the optic nerve toyour brain to be interpreted With this complex structurethe human eye is capable of seeing clearly in bright and dimconditions focusing on both near and far objects and alsodetecting colors

Figure 20 A concave lens

refracts light rays so they spread

out away from the optical axis

Classify Is a concave lens mostlike a concave mirror or a convexmirror

Optical axis

Retina

Focalpoint

Pupil

Cornea

Lens

Optic nerve

Figure 21 The cornea and lens in your eye

bend light rays so that a sharp image is

formed on the retina

Eye Doctors Optometristsand ophthalmologists treatmany different eye prob-lems They often useadvanced technology todiagnose and correct mal-functioning parts of theeye Research an eye prob-lem and how it is treatedWrite a paragraph describ-ing what parts of the eyeare affected by the problemand how doctors correct it

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336 CHAPTER 11 Sound and Light

Brightness and Intensity The human eye can adjust to thebrightness of the light that strikes it If you step outside on asunny day you may have to shade your eyes against the intensityof the sunlight Light intensity is the amount of light energy thatstrikes a certain area each second Brightness is the human per-ception of light intensity Sunlight seems bright because a largeamount of light energy strikes your retina each second Youreyes respond to bright light by decreasing the size of your pupilThis reduces the amount of light that enters your eye and strikesthe retina

Intensity depends on your distance from a light source Ifyou move away from a bare lightbulb you can see how theintensity of the light rapidly decreases Because light rays spreadout from the source less light energy strikes your retina thefarther away you are from the bulb

Correcting Vision ProblemsIf you have good vision you should be able to see objects

clearly when they are 25 cm or farther away from your eyes Asharp image of an object should be formed on your retinaHowever for many people the image is blurry or formed in thewrong place causing vision problems

Farsightedness If you can see distant objects clearly butcanrsquot bring nearby objects into focus then you are farsighted Inthis case the eyeball might be too short or the lens isnrsquot curvedenough to form a sharp image of nearby objects on the retinaas shown in Figure 22 To correct the problem convex lensescan be used to bend incoming light rays so they converge beforethey enter the eye

Experimenting withFocal LengthsProcedure1 Complete the safety form

2 Fill a glass test tube with

water and seal it with a

lid or stopper3 Type or print SULFUR

DIOXIDE in capital letters

on a piece of paper4 Set the test tube horizon-

tally over the words

Record your observations

5 Hold the tube at several

heights above the words

Record your observations

Analysis1 Describe how the words

changed as the height of

the test tube increased

2 Classify the image at each

height as real or virtual

Focal

point

Correctedfarsighted eye

Light fromnearby object

Focalpoint

Light fromnearby object

Farsighted eye

The focal length of a farsighted eye is too long to form

a sharp image of nearby objects on the retina

A convex lens in front of a farsighted eye enables a sharp

image of nearby objects to be formed on the retina

Figure 22 Farsightedness can

be corrected by convex lenses

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SECTION 3 Mirrors Lenses and the Eye 337

Self Check

1 Diagram how light rays from an object are reflected by

a convex mirror to form an image

2 Infer how the size of the image changes if an object

that is less than one focal length from a concave mirror

moves closer to the mirror

3 Explain how the focal length of a convex lens changes

as the sides of the lens become less curved

4 Compare the image of an object less than one focal

length from a convex lens with the image of an object

more than two focal lengths from the lens

5 Think Critically Describe the image formed by a light

source placed at the focal point of a convex lens

Summary

Mirrors

bull A plane mirror forms upright virtual images

bull The image formed by a concave mirror

depends on the location of the object relative

to the focal point

bull Convex mirrors always produce virtual upright

images that are smaller than the object

Lenses

bull The image formed by a convex lens depends

on the distance of the object from the lens

bull Concave lenses always form virtual upright

images that are smaller than the object

The Eye and Vision

bull The eye contains a lens that changes shape to

produce sharp images on the retina

bull Farsightedness occurs when the eye cannot

form a sharp image of nearby objects

Nearsightedness occurs when the eye cannot

form sharp images of distant objects

6 Calculate Object Distance If you looked through a

convex lens with a focal length of 15 cm and saw a

real inverted enlarged image what is the maximum

distance between the lens and the object

Nearsightedness If you have nearsighted friends you knowthat they can see only nearby objects clearly Their eyes cannotform a sharp image on the retina of an object that is far awayInstead the image is formed in front of the retina as shown inFigure 23 To correct this problem a nearsighted person canwear concave lenses Figure 23 shows how a concave lens causesincoming light rays from distant objects to diverge before theyreach the eye Then the rays can be focused by the eye to form asharp image on the retina

Figure 23 Nearsightedness can

be corrected with concave lenses

Focalpoint

Light fromdistant object

Nearsighted eye

Focalpoint

Light fromdistant object

Correctednearsighted eye

When a nearsighted person looks at distant objects a

sharp image is formed in front of the retina

A concave lens in front of a nearsighted eye makes light

rays diverge so a sharp image is formed on the retina

More Section Review gpesciencecom

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How can you see the back of your head You

can use two mirrors to view a reflection of a

reflection of the back of your head

Real-World ProblemHow many images are seen in two mirrors

Goal Infer how the number of images depends

on the angle between two mirrors

Materialsplane mirrors (2) protractor

masking tape paper clip

Safety Precautions

Handle glass mirrors and paper clips carefully

Procedure1 Complete the safety form

2 Lay one mirror on top of the other with the

mirror surfaces together Tape together one

side so they can open and close Use tape to

label them L and R for left and right

3 Open the mirrors and stand them on a sheet

of paper at an angle of 72deg

4 Bend one leg of a paper clip up 90deg and

place it close to the front of the R mirror

5 Count the number of images of the paper

clip you see in the R and L mirrors Record

these numbers in your data table

6 The mirrors create an image of a circle

divided into wedges Record the number

of wedges

7 Hold the R mirror still and slowly move the Lmirror to 90deg Record the numbers of images

of the clip and wedges in the circle Repeat

this time opening the mirrors to 120deg

Conclude and Apply1 Infer the relationship between the number

of wedges and paper clip images

2 Determine the angle that would divide a

circle into six wedges Hypothesize how

many images would be produced Test your

hypothesis

Reflections of Reflections

Demonstrate for younger students the

relationship between the angle of the

mirrors and the number of reflections

338 CHAPTER 11 Sound and Light

Angle

Number of Number

of Mirrors Paper Clip Images

of Wedges R L

72ordm

90ordm

120ordm

Images and Wedges Seen in the Mirrors

Do not write in this book

SECTION 4 Light and Color 339

Why Objects Have ColorWhy do some apples appear red while others look green or

yellow An objectrsquos color depends on the wavelengths of light itreflects Recall that white light is a blend of all colors of visiblelight When a red apple is struck by white light it reflects redlight back to your eyes and absorbs all of the other colorsFigure 24 shows white light striking a green leaf Only the wave-lengths corresponding to green light are reflected to your eyes

Although some objects appear to be black black isnrsquot acolor Black is the absence of visible light Objects that appearblack absorb all colors of light and reflect little or no light backto your eyes White objects appear to be white because theyreflect all colors of visible light

Why does a white object appear white

Colored Filters Wearing tinted glasses changesthe color of almost everything you see If the lensesare yellow the world takes on a golden glow If theyare rose colored everything looks rosy Somethingsimilar would occur if you placed a colored clearplastic sheet over this white page The paper wouldappear to be the same color as the plastic The plasticsheet and the tinted lenses are filters A filter is atransparent material that transmits one or more col-ors of light but absorbs all others The color of a fil-ter is the color of the light that it transmits

Light and Color

Reading Guide

Explain how you see color Describe the difference between

light color and pigment color Predict what happens when dif-

ferent colors are mixed

From traffic lights to great works of

art color is an important part of your

world

Review Vocabulary

retina inner layer of the eye con-

taining cells that convert light

images into electrical signals

New Vocabulary

bull pigment

Figure 24 This leaf absorbs all

wavelengths of visible light except

the wavelengths you see as green

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340 CHAPTER 11 Sound and Light

Looking Through Colored Filters Figure 25 shows howthe color of an object can change when you look at it throughvarious colored filters The cooler looks blue under white lightbecause it reflects only the wavelengths of blue light that strikeit If you look at the cooler through a blue filter the cooler stilllooks blue because the blue filter transmits the reflected bluelight However if you look at the cooler through a red filter thecooler seems black because the red filter blocks the blue lightreflected by the cooler

Why does a blue object appear black whenviewed through a red filter

Seeing ColorAs you approach a busy intersection the color of the traffic

light changes from green to yellow to red On the cross street thecolor changes from red to green At a busy intersection trafficsafety depends on your ability to detect color changes rapidlyHow do you see colors

Light and the Eye In a healthy eye light enters the eyethrough the cornea is focused by the lens and finally forms animage on the retina The retina is made up of two types of cellsthat absorb light as shown in Figure 26 When these cellsabsorb light energy chemical reactions convert light energy intonerve impulses that are transmitted to the brain One type ofcell in the retina called a cone enables you to distinguish colorsand detailed shapes of objects Cones need bright light to gener-ate nerve impulses so they do not operate in dim light As aresult even brightly colored objects might look gray or black indim light

Figure 25 The color of this

cooler changes when viewed

through different color filters

Topic Color BlindnessVisit for Web

links to information about the

causes of color blindness

Activity Research the causes

and types of color blindness Find

out how cones are related to the

ability to distinguish colors

gpesciencecom

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SECTION 4 Light and Color 341

Cones and Rods Your eyes have three types of cones each ofwhich responds to a different range of wavelengths Red conesrespond to mostly red and yellow light Green cones respond tomostly yellow and green light Blue cones respond to mostlyblue and violet light The second type of cell in the retina calleda rod is sensitive to dim light and enables you to see at nightHowever rod cells do not enable you to see colors

Interpreting Color Why does a bananalook yellow The light reflected by the

banana causes the cone cells that are sensitive to red and greenlight to send signals to your brain Your brain could get the samesignal if a mixture of red light and green light reached your eyesThis mixture also would cause your red and green cones torespond and you would see the color yellow As a result lightwith wavelengths corresponding to yellow light and light that isa mixture of red and green light both cause the color yellow tobe seen What happens when you look at a white shirt You seewhite when all wavelengths of visible light enters your eyes Thenall three sets of cones cells send signals to the brain The com-bination of these signals cause you to see the shirt as white

Color Blindness If one or more of your sets of cone cellsdo not function properly you might not be able to distinguishcertain colors This condition is called color blindness orcolor deficiency About eight percent of men and one-halfpercent of women have some form of color blindness Themost common form of color blindness makes it difficult todistinguish between red and green Figure 27 shows an imagethat is used in a test for redndashgreen color blindness Becausered and green are used in traffic signals drivers and pedestri-ans must be able to identify them

Retina

Rod

Cone

Lens

Figure 27 Color blindness is an

inherited sex-linked condition in

which certain sets of cones in the

retina do not function properly

Identify the number that you seein the dots

Figure 26 Light enters the eye

and focuses on the retina The two

types of light-detecting cells

that make up the retina

are called rods and cones

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342 CHAPTER 11 Sound and Light

Mixing ColorsIf you have ever browsed through a paint store you have

probably seen displays where customers can select paint samplesof almost every imaginable color The colors are a result of mix-tures of pigments For example you might have mixed blue andyellow paint to produce green paint A pigment is a coloredmaterial that is used to change the color of other substancesThe color of a pigment results from the different wavelengths oflight that the pigment reflects

Mixing Colored Lights From the glowing orange of a sun-set to the deep blue of a mountain lake all the colors you see canbe made by mixing three colors of light These three colorsmdashred green and bluemdashare the primary colors of light They cor-respond to the three different types of cones in the retina ofyour eye When mixed together in equal amounts they producewhite light as Figure 28 shows Mixing the primary colors indifferent proportions can produce the colors you see

What are the primary colors of light

Paint Pigments If you were to mix equal amounts of redgreen and blue paint would you get white paint If mixing col-ors of paint were like mixing colors of light you would but mix-ing paint is different Paints are made with pigments Pigmentsproduce color as a result of the wavelengths of light they reflectPaint pigments usually are made of chemical compounds suchas titanium oxide a bright white pigment and lead chromatewhich is used for painting yellow lines on highways

Figure 28 White light is pro-

duced when the three primary col-

ors of light are mixed in equal

amounts

Color for PhotosynthesisPlant pigments determinethe wavelengths oflight for photosynthesisLeaves usually look greenbecause of the pigmentchlorophyll Chlorophyllabsorbs most wave-lengths of visible lightexcept green which itreflects However not allplants are green Researchdifferent plant pigmentsto find out how they allowplant species to survive indiverse habitats

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SECTION 4 Light and Color 343

Self Check

1 Identity what colors are reflected and what colors are

absorbed if a white light shines on a red shirt

2 Discuss how the primary colors of light differ from the

primary pigment colors

3 Explain why a red apple would appear black if you

looked at it through a blue filter

4 Determine why a white fence appears to be white instead

of multicolored if all colors are present in white light

5 Think Critically Light reflected from an object passes

through a green filter then a red filter and finally a

blue filter What color will the object seem to be

Summary

Why Objects Have Color

bull The color of an object is determined by the

wavelengths of light it reflects

bull The color of a filter is the color of the light the

filter transmits

Seeing Color

bull Rod and cone cells are light-sensitive cells

found in the retina of the human eye

bull Rod cells are sensitive to dim light Cone cells

enable colors to be seen

bull There are three types of cone cells One type

responds to red light another to green light

and another to blue light

Mixing Colors

bull Red green and blue are the primary light

colors Any color of light can be created by

mixing these primary light colors

bull Any pigment color can be formed by mixing

the primary pigment colorsmdashmagenta cyan

and yellow

6 Use Percentages In the human eye there are about

120000000 rods If 90000000 rods trigger at once

what percentage of the total number of rods triggered

7 Convert Units The wavelengths of light are measured

in nanometers (nm) which equals 0000001 mm

Find the wavelength in mm of a light wave that has a

wavelength of 690 nm

Mixing Pigments You can make any pigment color by mixingdifferent amounts of the three primary pigmentsmdashmagenta(bluish red) cyan (greenish blue) and yellow In fact color print-ers use these pigments as well as black ink to make full-colorprints like the pages in this book A primary pigmentrsquos colordepends on the wavelengths of the light that it reflects Actuallypigments both absorb and reflect a range of colors in sending asingle color message to your eye For example in white lightyellow pigment appears yellow because it reflects red and greenlight but absorbs the other wavelengths of visible light The colorof a mixture of two primary pigments is determined by theprimary colors of light that both pigments reflect

Look at Figure 29 The area in the center where the colors alloverlap appears to be black because the three blended primarypigments absorb all the primary colors of light Recall that theprimary colors of light combine to produce white light They arecalled additive colors However when the primary pigment col-ors are combined they absorb all wavelengths of visible light andproduce black Because black results from the absence ofreflected light the primary pigments are called subtractive colors

Figure 29 The three primary

pigment colors appear to be black

when they are mixed

Describe how the primary pigmentcolors are similar to the primary col-ors of light

More Section Review gpesciencecom

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Design Your OwnDesign Your Own

344

Real-World ProblemWhat loud noises do you enjoy and which ones do you find annoying

Most people enjoy a music concert performed by their favorite artist or

the booming displays of fireworks on the Fourth of July Most people

enjoy these loud sounds for short periods of time However certain

other loud noises such as traffic sirens and loud talking can be

annoying Constant annoying noises are called noise pollution What

can be done to reduce noise pollution What types of barriers will best

block out noise pollution

Form a HypothesisBased on your experiences with loud noises form a hypothesis that

predicts the effectiveness of different types of barriers at blocking out

noise pollution

Test Your HypothesisMake a Plan

1 Complete the safety form

2 Decide what type of barriers or materials you will test

3 Describe exactly how you will use these materials

Goals Design an experiment

that tests the effective-

ness of various types of

barriers and materials

for blocking out noise

pollution

Test different types of

materials and barriers

to determine the best

noise blocks

Possible Materialsradio CD player horn

drum or other loud

noise source

shrubs trees concrete

walls brick walls stone

walls wooden fences

parked cars or hanging

laundry

sound meter

meterstick or metric tape

measure

Blocking NfisePollution

4 Identify the controls and variables you will use in your

experiment

5 List the steps you will use and describe each step precisely

6 Prepare a data table in your Science Journal to record your

measurements

7 Organize the steps of your experiment in logical order

Follow Your Plan

1 Ask your teacher to approve your plan and data table before

you start

2 Conduct your experiment as planned

3 Test each barrier two or three times

4 Record the results from each test in your data table in your Science Journal

Analyze Your Data1 Identify the barriers that most effectively reduced noise pollution

2 Identify the barriers that least effectively reduced noise pollution

3 Compare the effective barriers and identify common characteristics that might

explain why they reduced noise pollution

4 Compare the natural barriers you tested with the artificial barriers Which type

of barrier best reduced noise pollution

5 Compare the different types of materials the barriers were made of Which

type of material best reduced noise pollution

Conclude and Apply1 Evaluate whether your results support your hypothesis

2 Predict how your results would differ if you used a louder source of noise such

as a siren

3 Infer from your results how people living near a

busy street could reduce noise pollution

4 Identify major sources of noise pollution in or

near your home How could they be reduced

5 Research how noise pollution can be

unhealthy

LAB 345

Draw a poster illustrating how builders and

landscapers could use certain materials to

better insulate a home or office from excess

noise pollution

346 CHAPTER 11 Sound and Light

A Haiku GardenThe Four Seasons in Poems and Prints

by Stephen Addiss with Fumiko and Akira Yamamoto

Respond to the Reading1 How do the illustrations help the reader

better understand the poems2 What do you think is meant by the

word lingering in the Haiku about springsunlight

3 Linking Science and Writing Writeone haiku about summer and anotherabout fall In one poem use color tohelp you describe the season In theother use light or some property oflight to help describe the season

Research has deter-mined that there is a

connection between color and mood Warmcolors have longer wavelengths and can bemore stimulating Cool colors which haveshorter wavelengths tend to have a calmingor soothing effect on people Light and colorhave long been used as literary symbols Doesthe use of color change what you imaginewhen you read the haiku

UnderstandingLiteratureJapanese Haiku A haiku is a verse thatconsists of three lines and 17 syllables inthe Japanese language The first and thirdlines have five syllables each and themiddle line has seven syllables Why isimagination important in reading haiku

Lingering

in every pool of watermdash

spring sunlightIssa

Withered by winter

the sound of the windmdash

one-color worldBasho

Sound

1 Sound waves are compressional waves thattravel only in matter

2 The speed of sound in a material dependson the type of material as well as itstemperature

3 Loudness depends on a sound waversquos inten-sity Pitch depends on a sound waversquosfrequency

4 Sound waves are used in echolocationsonar and medical imaging

Reflection and Refractionof Light

1 Light can be absorbed reflected or trans-mitted by a material

2 When light waves are reflected theyobey the law of reflectionmdashthe angle ofincidence equals the angle of reflection

3 A light wave is refracted or bent whenit changes speed as it travels at an anglefrom one material to another

Mirrors Lenses andthe Eye

1 Plane mirrors form upright virtual images

2 Images formed by concave mirrors andconvex lenses depend on the location ofthe object relative to the focal point

3 Convex mirrors and concave lenses formvirtual upright images that are smallerthan the object

4 The lens in the human eye changes shape toproduce a sharp image on the retina

Light and Color

1 You see color when light is reflected offobjects and into your eyes

2 Cone cells in the retina are light-sensitivecells that enable you to distinguish colors

3 Red blue and green are the three primarycolors of light and can be mixed to form allother colors

4 The primary pigment colors are magentacyan and yellow

CHAPTER STUDY GUIDE 347

Use the Foldable you made at the beginningof the chapter to help you review sound and light

Interactive Tutor gpesciencecom

Complete each statement with the correctvocabulary word or phrase

1 A change in frequency due to a movingsound source is due to the

2 A flat smooth surface that reflects light andforms an image is a(n)

3 An object is if you can seethrough it clearly

4 The of a material indicates howmuch the speed of light in the materialchanges as light passes through

5 You can change the color of white paint byadding a(n) to it

6 A(n) is a reflecting surface thatcurves outward like the back of a spoon

7 The human perception of the intensity of asound wave is

Choose the word or phrase that best answerseach question

8 Which of the following best describes imageformation by a plane mirrorA) A real image is formed in front of the mirrorB) A real image is formed behind the mirrorC) A virtual image is formed in front of the

mirrorD) A virtual image is formed behind the mirror

9 For a sound with low pitch what else isalso always lowA) amplitude C) wavelengthB) frequency D) wave velocity

10 Which of the following occurs when asound source moves away from youA) The soundrsquos velocity decreasesB) The soundrsquos loudness increasesC) The soundrsquos frequency decreasesD) The soundrsquos frequency increases

Use the table below to answer question 11

11 Based on the data in the table abovewhich of the following would be the speedof sound in air at 30degCA) 3404 ms C) 3494 msB) 3464 ms D) 3534 ms

12 What happens to a light ray travelingparallel to the optical axis of a convexlens that passes through the lensA) It travels parallel to the optical axisB) It passes through the focal pointC) It is bent away from the optical axisD) It forms a virtual image

13 Light waves of which color are bent mostwhen passing through a prismA) blue C) violetB) red D) yellow

14 Which way does a concave lens bend lightA) toward its optical axisB) toward its centerC) toward its edgesD) toward its focal point

Speed of Sound in Air

Temp peed( s)

4

4

4

348 CHAPTER REVIEW

concave lens p 335concave mirror p 332convex lens p 333convex mirror p 333decibel p 322Doppler effect p 323index of refraction p 329intensity p 322

loudness p 322opaque p 327pigment p 342pitch p 323plane mirror p 331translucent p 327transparent p 327

Vocabulary PuzzleMaker gpesciencecom

Use the illustration below to answer question 15

15 Describe how the position of the candlechanged if the image of the candle movedaway from the focal point

16 Apply Acoustic scientists sometimes doresearch in rooms that absorb all soundwaves How could such a room be used tostudy how bats find their food

17 Compare White light passes through atranslucent pane of glass and shines on ashirt Both the translucent glass and theshirt appear green Compare the colors oflight that are absorbed and transmitted bythe glass and the shirt

18 Infer Most mammals including dogs andcats canrsquot see colors Infer how the retinaof a catrsquos eye might be different from theretina of a human eye

19 Determine whether a convex lens could forman image that is enlarged real and upright

20 Infer A car comes to a railroad crossingThe driver hears a trainrsquos whistle and itspitch becomes lower What can beassumed about how the train is moving

21 Compare and contrast the reflection of lightfrom a white wall with a rough surfacewith the reflection of light from a mirror

Optical axis

One

focal

length

Two

focal

lengths

Image

Ray A

Object

Focal

point

Interpreting Graphics 22 Infer why a convex mirror and a concavelens can never produce a real image

23 Predict what color a white shirt wouldappear to be if the light reflected from theshirt passed through a red filter and thenthrough a green filter

24 Explain why windows might begin to rattlewhen an airplane flies overhead

25 Communicate Some people enjoy usingsnowmobiles Others object to the noisethat they make Write a proposal for a pol-icy that seems fair to both groups for theuse of snowmobiles in a state park

CHAPTER REVIEW 349

Use the wave speed equation ν ƒλ to answer

questions 26 and 27

26 Calculate Frequency A sonar pulse has awavelength of 30 cm and a speed inwater of 1500 ms Find its frequency

27 Calculate Wavelength What is the wave-length of a sound wave with a fre-quency of 440 Hz if the speed of soundin air is 340 ms

28 Calculate Angle of Incidence A light ray isreflected from a mirror If the anglebetween the incident ray and thereflected ray is 136deg what is the angleof incidence

29 Determine Object Distance You hold anobject in front of a concave mirror witha focal length of 30 cm If you do notsee a reflected image how far from themirror is the object

30 Calculate Speed The speed of light in avacuum is 300000 kms If the index ofrefraction of water is 133 what is thespeed of light in water

More Chapter Review gpesciencecom

1 Which of the following describes the imageformed by a convex mirror

A enlarged

B inverted

C real

D virtual

Use the figure below to answer question 2

2 Which of the following describes a light raythat passes through the focal point andthen is reflected by the mirror

A It travels parallel to the optical axis

B It forms a real image

C It is reflected back through the focal point

D It forms a virtual image

3 Why does an apple look red

A It reflects red light

B It absorbs red light

C It reflects green and blue light

D It reflects all colors of light except red

Use the figure below to answer questions 4 and 5

4 When the primary colors of light are addedtogether what color appears in area H

A cyan

B magenta

C white

D yellow

5 When the primary colors of light are addedtogether what color appears in area G

A cyan

B magenta

C white

D yellow

6 Which of the following increases as the fre-quency of a sound increases

A amplitude

B intensity

C loudness

D pitch

Red Blue

Green

F

H

G K

Focal pointOptical axis

350 STANDARDIZED TEST PRACTICE

Record your answers on the answer sheet provided by your teacher or on a sheet of paper

STANDARDIZED TEST PRACTICE 351

7 Which of the following parts of the eyeenable you to see colors in bright light

A cone cells

B cornea

C lens

D rod cells

Use the graph below to answer questions 8 and 9

8 Determine how far in centimeters theimage is from the lens when the object is15 centimeters from the lens

9 How far in centimeters is the object fromthe lens when the image distance andobject distance are equal

10 A shirt has stripes that are black and whitein white light If green light shines on thisshirt what colors will the black and whitestripes be

11 If you are on a moving train what hap-pens to the pitch of a crossing bell as youapproach the crossing and then moveaway from the crossing

Use the figure below to answer question 12

12 Describe the vision problem show by thefigure and explain how this vision prob-lem can be corrected

13 Explain why the human eye can see colorsbetter in bright light than in dim light

Image Distance fora Convex Lens

Ima

ge

dis

tan

ce (

cm)

30

25

20

15

10

5 10 15 20 25 30

Object distance (cm)

Standardized Test Practice gpesciencecom

Note Units Read carefully and make note of the units used in

any measurement

  • Glencoe Physical Science with Earth Science
    • Student Edition Table of Contents
      • Unit 1 Science and Technology
        • Chapter 1 The Nature of Science
          • Launch Lab Understanding Measurements
          • Foldables
          • Section 1 The Methods of Science
            • Science Online
            • Integrate History
            • Integrate Earth Science
            • Science Online
              • Section 2 Standards of Measurement
                • Applying Math Centimeters
                • Integrate Earth Science
                • Science Online
                • MiniLAB Determining the Density of a Pencil
                • Visualizing SI Dimensions
                  • Section 3 Communicating with Graphs
                    • Applying Math Temperature
                    • MiniLAB Graphing Temperature Change
                    • Lab Whats my graph
                    • Lab Design Your Own - Developing a Measurement System
                    • Science and Language Arts Thinking in Pictures and Other Reports from My Life with Autism
                      • Chapter 1 Study Guide
                      • Chapter 1 Review
                      • Chapter 1 Standardized Test Practice
                        • Chapter 2 Science Technology and Society
                          • Lab Technology in Your Life
                          • Foldables
                          • Section 1 Science and Technology
                            • MiniLAB Researching the Past
                            • Visualizing Technology Supplying Basic Needs
                            • Science Online
                              • Section 2 Forces that Shape Technology
                                • MiniLAB Evaluating the Benefits and Consequences of Technology
                                • Integrate Environment
                                • Integrate History
                                • Applying Science What impact does the accident at Chernobyl have on the future of nuclear power
                                • Science Online
                                • Lab Who contributes CO2
                                  • Section 3 Developing Technology
                                    • Integrate Life Science
                                    • Integrate Career
                                    • Lab Model and Invent - Care Package
                                    • Oops Accidents in Science A Slippery Situation
                                      • Chapter 2 Study Guide
                                      • Chapter 2 Review
                                      • Chapter 2 Standardized Test Practice
                                          • Unit 2 Motion Forces and Energy
                                            • Chapter 3 Motion Acceleration and Forces
                                              • Launch Lab Compare Speeds
                                              • Foldables
                                              • Section 1 Describing Motion
                                                • MiniLAB Measuring Average Speed
                                                • Science Online
                                                • Applying Math Average Speed
                                                • Integrate Astronomy
                                                • Science Online
                                                  • Section 2 Acceleration
                                                    • Integrate History
                                                    • Visualizing Acceleration
                                                      • Section 3 Motion and Forces
                                                        • Science Online
                                                        • MiniLAB Comparing Friction
                                                        • Lab Force and Acceleration
                                                        • Lab Design Your Own - Comparing Motion from Different Forces
                                                        • Science and Language Arts A Brave and Startling Truth
                                                          • Chapter 3 Study Guide
                                                          • Chapter 3 Review
                                                          • Chapter 3 Standardized Test Practice
                                                            • Chapter 4 The Laws of Motion
                                                              • Launch Lab The Force of Gravity
                                                              • Foldables
                                                              • Section 1 The First Two Laws of Motion
                                                                • MiniLAB Observing Inertia
                                                                • Science Online
                                                                • Applying Math The Acceleration of a Sled Solve a Simple Equation
                                                                  • Section 2 Gravity
                                                                    • Science Online
                                                                    • Integrate Earth Science
                                                                    • MiniLAB Observing Centripetal Force
                                                                    • Lab Gravity and Air Resistance
                                                                      • Section 3 The Third Law of Motion
                                                                        • Integrate Career
                                                                        • Visualizing Rocket Motion
                                                                        • Applying Math The Momentum of a Sprinter
                                                                        • Lab The Momentum of Colliding Objects
                                                                        • Science and History Newton and the Plague
                                                                          • Chapter 4 Study Guide
                                                                          • Chapter 4 Review
                                                                          • Chapter 4 Standardized Test Practice
                                                                            • Chapter 5 Energy
                                                                              • Launch Lab Energy Conversions
                                                                              • Foldables
                                                                              • Section 1 The Nature of Energy
                                                                                • Science Online
                                                                                • Applying Math Kinetic Energy
                                                                                • MiniLAB Interpreting Data from a Slingshot
                                                                                • Integrate Language Arts
                                                                                • Applying Math Gravitational Potential Energy
                                                                                • Lab Bouncing Balls
                                                                                  • Section 2 Conservation of Energy
                                                                                    • Visualizing Energy Transformations
                                                                                    • Integrate Environment
                                                                                    • MiniLAB Transforming Energy in a Paper Clip
                                                                                    • Science Online
                                                                                    • Integrate Health
                                                                                    • Lab Design Your Own - Swinging Energy
                                                                                    • Science and History The Impossible Dream
                                                                                      • Chapter 5 Study Guide
                                                                                      • Chapter 5 Review
                                                                                      • Chapter 5 Standardized Test Practice
                                                                                        • Chapter 6 Work and Machines
                                                                                          • Launch Lab Doing Work with a Simple Machine
                                                                                          • Foldables
                                                                                          • Section 1 Work
                                                                                            • Integrate Language Arts
                                                                                            • Applying Math Work
                                                                                            • MiniLAB Calculating Your Work and Power
                                                                                            • Applying Math Power
                                                                                              • Section 2 Using Machines
                                                                                                • MiniLAB Machines Multiplying Force
                                                                                                • Science Online
                                                                                                • Integrate Chemistry
                                                                                                  • Section 3 Simple Machines
                                                                                                    • Integrate History
                                                                                                    • Visualizing Levers in the Human Body
                                                                                                    • Science Online
                                                                                                    • Lab Levers
                                                                                                    • Lab Model and Invent - Using Simple Machines
                                                                                                    • Science and Society The Science of Very Very Small
                                                                                                      • Chapter 6 Study Guide
                                                                                                      • Chapter 6 Review
                                                                                                      • Chapter 6 Standardized Test Practice
                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                          • Launch Lab Relative Sizes of Earth the Moon and the Sun
                                                                                                          • Foldables
                                                                                                          • Section 1 Earth in Space
                                                                                                            • Science Online
                                                                                                            • Integrate Physics
                                                                                                              • Section 2 Time and Seasons
                                                                                                                • MiniLAB Modeling the Suns Rays at Solstice
                                                                                                                • Lab Comparing the Angle of Sunlight to Intensity
                                                                                                                  • Section 3 Earths Moon
                                                                                                                    • Applying Math Tides
                                                                                                                    • MiniLAB Modeling Phases and Eclipses
                                                                                                                    • Integrate History
                                                                                                                    • Integrate History
                                                                                                                    • Science Online
                                                                                                                    • Visualizing Water on the Moon
                                                                                                                    • Lab Identifying the Moons Surface Features and Apollo Landing Sites
                                                                                                                    • Oops Accidents in Science Even Great Scientists Make Mistakes
                                                                                                                      • Chapter 7 Study Guide
                                                                                                                      • Chapter 7 Review
                                                                                                                      • Chapter 7 Standardized Test Practice
                                                                                                                        • Chapter 8 The Solar System
                                                                                                                          • Launch Lab The Size of the Solar System
                                                                                                                          • Foldables
                                                                                                                          • Section 1 Planet Motion
                                                                                                                            • Integrate History
                                                                                                                            • MiniLAB Plotting Retrograde Motion
                                                                                                                            • Integrate Physics
                                                                                                                            • Applying Math Heliocentric Longitude (HL)
                                                                                                                              • Section 2 The Inner Planets
                                                                                                                                • Science Online
                                                                                                                                • Integrate Chemistry
                                                                                                                                • Lab Interpreting Features of Marss Surface
                                                                                                                                  • Section 3 The Outer Planets
                                                                                                                                    • Integrate Language Arts
                                                                                                                                    • Visualizing What Galileo Saw
                                                                                                                                    • Science Online
                                                                                                                                    • MiniLAB Comparing Sizes of Outer and Inner Planets
                                                                                                                                      • Section 4 Life in the Solar System
                                                                                                                                        • Lab Design Your Own - Testing Unknown Soil Samples for Life
                                                                                                                                        • Science Stats Night Sky Wonders
                                                                                                                                          • Chapter 8 Study Guide
                                                                                                                                          • Chapter 8 Review
                                                                                                                                          • Chapter 8 Standardized Test Practice
                                                                                                                                              • Unit 3 Energy in Motion
                                                                                                                                                • Chapter 9 Heat and States of Matter
                                                                                                                                                  • Launch Lab Expansion of a Gas
                                                                                                                                                  • Foldables
                                                                                                                                                  • Section 1 Temperature and Thermal Energy
                                                                                                                                                    • Applying Math Converting to Celsius
                                                                                                                                                    • Science Online
                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                    • Applying Math Change in Thermal Energy
                                                                                                                                                      • Section 2 States of Matter
                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                        • Science Online
                                                                                                                                                        • MiniLAB Comparing States of Water
                                                                                                                                                          • Section 3 Transferring Thermal Energy
                                                                                                                                                            • MiniLAB Comparing Thermal Conductors
                                                                                                                                                            • Visualizing Convection Currents
                                                                                                                                                            • Lab Convection in Gases and Liquids
                                                                                                                                                              • Section 4 Using Thermal Energy
                                                                                                                                                                • Integrate History
                                                                                                                                                                • Science Online
                                                                                                                                                                • Lab Conduction in Gases
                                                                                                                                                                • Science Stats Surprising Thermal Energy
                                                                                                                                                                  • Chapter 9 Study Guide
                                                                                                                                                                  • Chapter 9 Review
                                                                                                                                                                  • Chapter 9 Standardized Test Practice
                                                                                                                                                                    • Chapter 10 Waves
                                                                                                                                                                      • Launch Lab How do waves transfer energy
                                                                                                                                                                      • Foldables
                                                                                                                                                                      • Section 1 The Nature of Waves
                                                                                                                                                                        • Visualizing Formation of Ocean Waves
                                                                                                                                                                        • Science Online
                                                                                                                                                                          • Section 2 Wave Properties
                                                                                                                                                                            • MiniLAB Observing Wavelength
                                                                                                                                                                            • Integrate Social Studies
                                                                                                                                                                            • Applying Math The Speed of Sound
                                                                                                                                                                            • Lab Wave Speed and Tension
                                                                                                                                                                              • Section 3 The Behavior of Waves
                                                                                                                                                                                • Science Online
                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                • MiniLAB Experimenting with Resonance
                                                                                                                                                                                • Lab Measuring Wave Properties
                                                                                                                                                                                • Science and History Making Waves
                                                                                                                                                                                  • Chapter 10 Study Guide
                                                                                                                                                                                  • Chapter 10 Review
                                                                                                                                                                                  • Chapter 10 Standardized Test Practice
                                                                                                                                                                                    • Chapter 11 Sound and Light
                                                                                                                                                                                      • Launch Lab What sound does a ruler make
                                                                                                                                                                                      • Foldables
                                                                                                                                                                                      • Section 1 Sound
                                                                                                                                                                                        • MiniLAB Comparing Intensity
                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                        • Science Online
                                                                                                                                                                                        • Applying Math Using Sonar
                                                                                                                                                                                          • Section 2 Reflection and Refraction of Light
                                                                                                                                                                                          • Section 3 Mirrors Lenses and the Eye
                                                                                                                                                                                            • Visualizing Images Formed by a Convex Lens
                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                            • MiniLAB Experimenting with Focal Lengths
                                                                                                                                                                                            • Lab Reflections of Reflections
                                                                                                                                                                                              • Section 4 Light and Color
                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Lab Design Your Own - Blocking Noise Pollution
                                                                                                                                                                                                • Science and Language Arts A Haiku Garden The Four Seasons in Poems and Print
                                                                                                                                                                                                  • Chapter 11 Study Guide
                                                                                                                                                                                                  • Chapter 11 Review
                                                                                                                                                                                                  • Chapter 11 Standardized Test Practice
                                                                                                                                                                                                    • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                      • Launch Lab Global Jigsaw Puzzle
                                                                                                                                                                                                      • Foldables
                                                                                                                                                                                                      • Section 1 Evolution of Earths Crust
                                                                                                                                                                                                        • Applying Math Spreading Distances
                                                                                                                                                                                                        • Integrate Physics
                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                          • Section 2 Earthquakes
                                                                                                                                                                                                            • MiniLAB Demonstrating Four Types of Stress
                                                                                                                                                                                                            • Visualizing Earthquake-Proof Buildings
                                                                                                                                                                                                              • Section 3 Earths Interior
                                                                                                                                                                                                              • Section 4 Volcanoes
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • MiniLAB Modeling Lava Viscosity
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                • Lab A Case for Pacific Plate Motion
                                                                                                                                                                                                                • Lab Earthquake Earthquake Wheres the earthquake
                                                                                                                                                                                                                • Science and History Volcano Weather
                                                                                                                                                                                                                  • Chapter 12 Study Guide
                                                                                                                                                                                                                  • Chapter 12 Review
                                                                                                                                                                                                                  • Chapter 12 Standardized Test Practice
                                                                                                                                                                                                                      • Unit 4 Forms of Energy
                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                          • Launch Lab Electric Circuits
                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                          • Section 1 Electric Charge
                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                            • Visualizing Lightning
                                                                                                                                                                                                                            • MiniLAB Investigate Charged Objects
                                                                                                                                                                                                                              • Section 2 Electric Current
                                                                                                                                                                                                                                • MiniLAB Investigating Battery Addition
                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                • Lab Identifying Conductors and Insulators
                                                                                                                                                                                                                                  • Section 3 Electrical Energy
                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                    • Applying Math Power Used by a Clothes Dryer
                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                    • Applying Math Electrical Energy Used by a Microwave Oven
                                                                                                                                                                                                                                    • Lab Design Your Own - Comparing Series and Parallel Circuits
                                                                                                                                                                                                                                    • Science and Language Arts Invisible Man
                                                                                                                                                                                                                                      • Chapter 13 Study Guide
                                                                                                                                                                                                                                      • Chapter 13 Review
                                                                                                                                                                                                                                      • Chapter 13 Standardized Test Practice
                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                          • Launch Lab The Strength of Magnets
                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                          • Section 1 Magnetism
                                                                                                                                                                                                                                            • MiniLAB Observing Magnetic Interference
                                                                                                                                                                                                                                            • Integrate Earth Science
                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                            • Applying Science How can magnetic parts of a junk car be salvaged
                                                                                                                                                                                                                                            • MiniLAB Making Your Own Compass
                                                                                                                                                                                                                                              • Section 2 Electricity and Magnetism
                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                  • Section 3 Producing Electric Current
                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                    • Visualizing Motors and Generators
                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                    • Lab Electricity and Magnetism
                                                                                                                                                                                                                                                    • Lab Design Your Own - Controlling Electromagnets
                                                                                                                                                                                                                                                    • Science and History Body Art
                                                                                                                                                                                                                                                      • Chapter 14 Study Guide
                                                                                                                                                                                                                                                      • Chapter 14 Review
                                                                                                                                                                                                                                                      • Chapter 14 Standardized Test Practice
                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                          • Launch Lab Can electromagnetic waves change materials
                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                          • Section 1 What are electromagnetic waves
                                                                                                                                                                                                                                                            • MiniLAB Investigating Electromagnetic Waves
                                                                                                                                                                                                                                                            • Applying Math The Speed of Light in Water
                                                                                                                                                                                                                                                              • Section 2 The Electromagnetic Spectrum
                                                                                                                                                                                                                                                                • MiniLAB Heating with Microwaves
                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                • Lab The Shape of Satellite Dishes
                                                                                                                                                                                                                                                                  • Section 3 Radio Communication
                                                                                                                                                                                                                                                                    • Visualizing Radio Broadcasts
                                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Lab Use the Internet - Radio Frequencies
                                                                                                                                                                                                                                                                    • Science and History Riding a Beam of Light
                                                                                                                                                                                                                                                                      • Chapter 15 Study Guide
                                                                                                                                                                                                                                                                      • Chapter 15 Review
                                                                                                                                                                                                                                                                      • Chapter 15 Standardized Test Practice
                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                          • Launch Lab Heating with Solar Energy
                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                          • Section 1 Fossil Fuels
                                                                                                                                                                                                                                                                            • Visualizing The Formation of Fossil Fuels
                                                                                                                                                                                                                                                                            • MiniLAB Designing an Efficient Water Heater
                                                                                                                                                                                                                                                                              • Section 2 Nuclear Energy
                                                                                                                                                                                                                                                                                • Integrate Earth Science
                                                                                                                                                                                                                                                                                • Integrate Social Science
                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                • Applying Science Can a contaminated radioactive site be reclaimed
                                                                                                                                                                                                                                                                                  • Section 3 Renewable Energy Sources
                                                                                                                                                                                                                                                                                    • MiniLAB Using Solar Power at Home
                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                    • Lab Solar Heating
                                                                                                                                                                                                                                                                                    • Lab Use the Internet How much does energy really cost
                                                                                                                                                                                                                                                                                    • Science and Society Reacting to Nuclear Energy
                                                                                                                                                                                                                                                                                      • Chapter 16 Study Guide
                                                                                                                                                                                                                                                                                      • Chapter 16 Review
                                                                                                                                                                                                                                                                                      • Chapter 16 Standardized Test Practice
                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                          • Lab Atmospheric Pressure
                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                          • Section 1 Earths Atmosphere
                                                                                                                                                                                                                                                                                            • MiniLAB Visualizing Convection
                                                                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                                                                            • Lab Visualizing a Temperature Inversion
                                                                                                                                                                                                                                                                                              • Section 2 Weather
                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Coriolis Effect
                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                  • Section 3 Climate
                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                    • Visualizing Earths Biogeophysical System
                                                                                                                                                                                                                                                                                                      • Section 4 Earths Changing Climates
                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                        • Applying Math Carbon Dioxide (CO2) Concentration
                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Investigating Microclimate
                                                                                                                                                                                                                                                                                                        • Science and Language Arts The Grapes of Wrath
                                                                                                                                                                                                                                                                                                          • Chapter 17 Study Guide
                                                                                                                                                                                                                                                                                                          • Chapter 17 Review
                                                                                                                                                                                                                                                                                                          • Chapter 17 Standardized Test Practice
                                                                                                                                                                                                                                                                                                              • Unit 5 Matter and Earth Materials
                                                                                                                                                                                                                                                                                                                • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                  • Launch Lab Demonstrate the Distillation of Water
                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                  • Section 1 Composition of Matter
                                                                                                                                                                                                                                                                                                                    • Visualizing Elements
                                                                                                                                                                                                                                                                                                                    • MiniLAB Classifying Materials
                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                    • Lab Comparing Pure Substances and Mixtures
                                                                                                                                                                                                                                                                                                                      • Section 2 Properties of Matter
                                                                                                                                                                                                                                                                                                                        • Integrate Environment
                                                                                                                                                                                                                                                                                                                        • MiniLAB Separating Ink
                                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                                        • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                        • Applying Math The Law of Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Measuring the Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Science Stats Intriguing Elements
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Study Guide
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Review
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                            • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                              • Launch Lab Inferring What You Cant Observe
                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                              • Section 1 Structure of the Atom
                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling an Aluminum Atom
                                                                                                                                                                                                                                                                                                                                • Visualizing The Atomic Model
                                                                                                                                                                                                                                                                                                                                  • Section 2 Masses of Atoms
                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                    • Applying Science How can radioactive isotopes help tell time
                                                                                                                                                                                                                                                                                                                                      • Section 3 The Periodic Table
                                                                                                                                                                                                                                                                                                                                        • MiniLAB Organizing a Personal Periodic Table
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Career
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                                                                                                                                                                        • Lab A Periodic Table of Foods
                                                                                                                                                                                                                                                                                                                                        • Lab Use the Internet Whats in a name
                                                                                                                                                                                                                                                                                                                                        • Science and History A Chilling Story
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Study Guide
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Review
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                            • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                              • Launch Lab Earth Materials at Home and School
                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                              • Section 1 Minerals
                                                                                                                                                                                                                                                                                                                                                • MiniLAB Identifying Salts Crystal System
                                                                                                                                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                • Lab Be a Mineral Detective
                                                                                                                                                                                                                                                                                                                                                  • Section 2 Igneous Rocks
                                                                                                                                                                                                                                                                                                                                                    • Applying Math Extrusive Igneous Rock Classification
                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                      • Section 3 Sedimentary Rocks
                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Evaporites
                                                                                                                                                                                                                                                                                                                                                          • Section 4 Metamorphic Rocks and the Rock Cycle
                                                                                                                                                                                                                                                                                                                                                            • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                            • Visualizing Shock Metamorphic Rock
                                                                                                                                                                                                                                                                                                                                                            • Lab Identifying Rocks
                                                                                                                                                                                                                                                                                                                                                            • Science and Society Earth Materials at Work
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Study Guide
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Review
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                  • Launch Lab Have you got the time
                                                                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                                                                  • Section 1 Weathering and Soil
                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing a Disappearing Seasoning
                                                                                                                                                                                                                                                                                                                                                                    • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                    • Lab Graphing Soil Textures
                                                                                                                                                                                                                                                                                                                                                                      • Section 2 Shaping the Landscape
                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Runoff
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                          • Section 3 Groundwater
                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Porosity Volume
                                                                                                                                                                                                                                                                                                                                                                            • Visualizing The Role of Groundwater in Shaping Earths Surface
                                                                                                                                                                                                                                                                                                                                                                            • Integrate Environment
                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                              • Section 4 Geologic Time
                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                                                                                                • Lab Its about time - relative that is
                                                                                                                                                                                                                                                                                                                                                                                • Science and Society Tapping into the Underground
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Review
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                      • Unit 6 Interactions of Matter
                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                          • Lab Chemical Bonds and Mixing
                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Stability in Bonding
                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                            • Lab Atomic Trading Cards
                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Types of Bonds
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Health
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                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Observing a Bond Type
                                                                                                                                                                                                                                                                                                                                                                                                • Visualizing Polar Molecules
                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Writing Formulas and Naming Compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math Determining a Formula
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Science Can you name binary ionic compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Making a Hydrate
                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Model and Invent - Modeling Chemical Bonding
                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Sticky Subject
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Review
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                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab RustingmdashA Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Chemical Changes
                                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Designing a Team Equation
                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Chemical Equations
                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math Barium Sulfate Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Classifying Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 4 Reaction Rates and Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing Chemical Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Creating a Colorful Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab To Glow or Not to Glow
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Investigating Reaction Conditions
                                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Clumsy Move Pays Off
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Study Guide
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                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab Magic Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 How Solutions Form
                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                                                                                                                                                                                                                                                            • Visualizing Metal Alloys
                                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Observing the Effect of Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Solubility and Concentration
                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Acids Bases and Salts
                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing Acid Relief
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Strength of Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Determining Acidity
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Saturated Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and Society Acid Rain
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Study Guide
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                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab The Size of a Nucleus
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Radioactivity
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                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Nuclear Decay
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Detecting Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math The Age of Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Social Studies
                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Nuclear Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling a Nuclear Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Visualizing PET Scans
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                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Study Guide
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math The Magnifying Power of Telescopes
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Page 13: 706 S1 318-326 GPS09 - Light-and-Sound - home · PDF fileWhat sound does a ruler make? ... sound waves cannot travel in empty space where there are no particles. ... sound travels

330 CHAPTER 11 Sound and Light

Self Check

1 Compare and contrast opaque transparent and

translucent materials Give one example of each

2 Discuss why you can see your reflection in a smooth

piece of aluminum foil but not in a crumpled ball of foil

3 Infer what happens to light waves that are reflected off

dust particles in the air

4 Explain what happens to white light when it passes

through a prism

5 Think Critically Suppose a material has the same index

of refraction as water How would a light wave change

direction as it traveled from water into this material

Summary

Light and Matter

bull The amount of light that is absorbed

reflected or transmitted depends on the

material making up the object

Reflection of Light

bull Light waves always obey the law of reflection

the angle of incidence equals the angle of

reflection

bull Regular reflection causes parallel light waves

to be reflected in only one direction

bull Diffuse reflection causes parallel light waves

to be reflected in many directions

bull Scattering occurs when light waves are reflected

and travel in many different directions

Refraction of Light

bull Refraction occurs when a light wave changes

speed in moving from one material to another

bull The index of refraction of a material indicates

how much light slows down in the material

6 Find an Angle A light wave strikes a mirror at an

angle of 42deg from the surface of the mirror What

angle does the reflected wave make with the normal

7 Find an Angle A light wave reflects from a mirror at

27deg from the normal What was the angle between

the mirror and the incident wave

Mirages When yoursquore traveling in a car you might see whatlooks like a pool of water on the road ahead As you get closerthe water seems to disappear Yoursquove seen a miragemdashan image ofa distant object produced by the refraction of light through airlayers of different densities Mirages result when the air atground level is much warmer or cooler than the air above asshown in Figure 13 The density of air increases as air cools andlight waves move slower in cooler air than in warmer air As aresult light waves are refracted as they pass through air layerswith different temperatures

Figure 13 Mirages result when

air near the ground is much

warmer or cooler than the air

above This causes light waves

reflected from an object to refract

creating one or more additional

images

MirageWarm air

Cool air

More Section Review gpesciencecom

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SECTION 3 Mirrors Lenses and the Eye 331

Light RaysLight sources send out light waves in all directions These

waves spread out like ripples on the surface of water spread outfrom the point of impact of a pebble You can think of the lightcoming from the source as being many narrow beams of light trav-eling in all directions Each narrow light beam is called a light ray

MirrorsA mirror is any surface that produces a regular reflection A pool

of still water a metal pan and even the back of a shiny spoon can bemirrors Mirrors can be flat curved inward or curved outward

Plane Mirrors A flat smooth mirror is a plane mirror Whenyou look in a plane mirror your image appears upright If youstand 1 m from the mirror your image appears 1 m behind themirror or 2 m from you In fact your image is what a friend stand-ing 2 m from you would see Figure 14 shows how your image isformed First light rays from a light source strike you Every pointthat is struck by the light rays reflects these rays so they travel out-ward in all directions If your friend were looking at you thesereflected light rays coming from you would enter her eyes so shecould see you However if a mirror is placed between you and yourfriend light rays are reflected from the mirror back to your eyes

Mirrors Lenses andthe Eye

Reading Guide

Describe how images are formed

by three types of mirrors Explain how convex and concave

lenses form images Explain how the human eye

enables you to see Describe how lenses are used to

correct vision problems

Mirrors and lenses are used in optical

instruments such as cameras and

telescopes

Review Vocabulary

reflection the process of changing

direction after striking a surface

New Vocabulary

bull plane mirror

bull concave mirror

bull convex mirror

bull convex lens

bull concave lens

Figure 14 Seeing an image of

yourself in a mirror involves two

sets of reflections light rays are

reflected from you and then are

reflected by the mirror

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332 CHAPTER 11 Sound and Light

Virtual and Real Images The forma-tion of an image by a plane mirror isshown in Figure 15 Your brain assumesthat light rays travel in a straight line As aresult rays that enter your eyes seem tocome from behind the mirror This makesthe image seem to be behind the mirrorHowever no light rays actually passthrough the place where the image seemsto be located This type of image is called avirtual image Plane mirrors always formvirtual images If light rays from an objectpass through the location of the image theimage is called a real image Curved mir-rors can form both real and virtual images

Concave Mirrors If the surface of a mirror is curved inwardit is called a concave mirror as shown in Figure 16 The opticalaxis is an imaginary straight line drawn perpendicular to thesurface of the mirror at its center Every light ray traveling par-allel to the optical axis is reflected through a point on the opti-cal axis called the focal point The distance from the center ofthe mirror to the focal point is called the focal length

The image formed by a concave mirror depends on the loca-tion of the object relative to the focal point Figure 16 shows acandle located more than twice the focal length from the mirrorAlthough many light rays come from each point on the candleonly two rays from the same point are shown Ray A passesthrough the focal point and then reflects off the mirror movingparallel to the optical axis Ray B travels parallel to the opticalaxis before reflecting off the mirror and passing through thefocal point The point where the two rays meet is the location ofthe image of the original point on the candle The image formedis a real image because light rays from the candle pass throughthe place where the image is located

Figure 16 Rays A and B start from the same

place on the candle travel in different directions

and meet again on the reflected image

Diagram how two other points on the image ofthe candle are formed

Figure 15 Your brain interprets

the light rays reflected by the

mirror as coming from a point

behind the mirror

Infer how the size of your imagein a plane mirror depends on yourdistance from the mirror

Focalpoint

Optical axis

Ray B

Ray A

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SECTION 3 Mirrors Lenses and the Eye 333

Images Produced by a ConcaveMirror When an object is between oneand two focal lengths from a concavemirror the image is real inverted andlarger than the object An object closerthan one focal length from a concavemirror produces a virtual image that isupright and larger than the object Noimage is produced if the object islocated at the focal point

Convex Mirrors When you are in astore look up toward one of the backcorners or at the end of an aisle to see ifa large rounded mirror is mountedthere You can see a large area of the store in such a mirror Amirror that curves outward like the back of a spoon is called aconvex mirror Light rays that hit a convex mirror diverge orspread apart after they are reflected Figure 17 shows how therays from an object are reflected by a convex mirror to form animage The reflected rays diverge and never meet so a convexmirror forms only a virtual image The image also is upright andsmaller than the actual object is

Describe the image formed by a convex mirror

LensesWhat do your eyes have in common with cameras eyeglasses

and microscopes Each of these contains at least one lens A lens is atransparent object with at least one curved surface that causes lightrays to refract The image that a lens forms depends on the shape ofthe lens Like curved mirrors lenses can be convex or concave

Convex Lenses A convex lens is thicker in the middle than atthe edges Its optical axis is an imaginary straight line that is per-pendicular to the surface of the lens at its thickest point When lightrays approach a convex lens traveling parallel to its opticalaxis the rays are refracted toward the center of the lens asin Figure 18 Light rays traveling along the optical axis arenot bent at all All light rays traveling parallel to the opti-cal axis are refracted so they pass through a single pointwhich is the focal point of the lens The less curved thesides of the lens the less light rays are bent As a resultlenses with flatter sides have longer focal lengths Figure 19

on the next page shows that convex lenses can form eitherreal or virtual images

Figure 18 Convex lenses are

thicker in the middle than at the

edges Light rays that are parallel

to the optical axis are refracted so

that they pass through the focal

point A light ray that passes

through the center of the lens is

not refracted

Figure 17 A convex mirror

forms a reduced upright virtual

image

Optical axis

Ray A

Ray B

Focallength

Focalpoint

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Figure 19

VISUALIZING IMAGES FORMED BY A CONVEX LENS

334 CHAPTER 11 Sound and Light

Aconvex lens can form images that are real or virtual enlarged or reduced and upright orinverted Just as for a concave mirror the type of image formed by a convex lens depends on thelocation of the object relative to the focal point of the lens

Optical axis

One

focal

length

Two

focal

lengthsRay B

Image

Ray A

Object

Focal

point

Optical axis

One

focal

length

Two

focal

lengths

Ray B

Ray AObject

Image

Focal

point

Optical axis

Ray B

ObjectRay A

One

focal

length

Focal

pointImage

If the object is more than two focal lengths from the lens the image formed is real inverted andsmaller than the object As the object moves farther from the lens the image becomes smaller

If the object is between one and two focal lengths from the lens the image formed is real invertedand larger than the object As the object moves closer to the focal point the image becomes larger

If the object is less than one focal length from the lens the image is virtual upright and larger thanthe object The image is virtual because the light rays from the object diverge after they pass throughthe lens The image becomes smaller as the object moves closer to the lens

SECTION 3 Mirrors Lenses and the Eye 335

Concave Lenses A concave lens is thinnerin the middle and thicker at the edges Asshown in Figure 20 light rays that passthrough a concave lens bend away from theoptical axis The rays spread out and nevermeet so a real image is never formed Theimage is always virtual upright and smallerthan the object is Concave lenses are used insome types of eyeglasses and some telescopesConcave lenses usually are used in combinationwith other lenses

What type of image is formed by a concave lens

The Human EyeWhat determines how well you can see the words on this

page If you donrsquot need eyeglasses the structure of your eye givesyou the ability to focus on these words and other objects aroundyou Look at Figure 21 Light enters your eye through a trans-parent covering on your eyeball called the cornea The corneacauses light rays to bend so that they converge The light thenpasses through an opening called the pupil Behind the pupil isa flexible convex lens Muscles attached to the lens change itsshape to help focus light forming a sharp image on your retina

The retina is the inner lining of your eye The retina con-tains light-sensitive cells that convert an image into electricalsignals These signals then are carried along the optic nerve toyour brain to be interpreted With this complex structurethe human eye is capable of seeing clearly in bright and dimconditions focusing on both near and far objects and alsodetecting colors

Figure 20 A concave lens

refracts light rays so they spread

out away from the optical axis

Classify Is a concave lens mostlike a concave mirror or a convexmirror

Optical axis

Retina

Focalpoint

Pupil

Cornea

Lens

Optic nerve

Figure 21 The cornea and lens in your eye

bend light rays so that a sharp image is

formed on the retina

Eye Doctors Optometristsand ophthalmologists treatmany different eye prob-lems They often useadvanced technology todiagnose and correct mal-functioning parts of theeye Research an eye prob-lem and how it is treatedWrite a paragraph describ-ing what parts of the eyeare affected by the problemand how doctors correct it

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336 CHAPTER 11 Sound and Light

Brightness and Intensity The human eye can adjust to thebrightness of the light that strikes it If you step outside on asunny day you may have to shade your eyes against the intensityof the sunlight Light intensity is the amount of light energy thatstrikes a certain area each second Brightness is the human per-ception of light intensity Sunlight seems bright because a largeamount of light energy strikes your retina each second Youreyes respond to bright light by decreasing the size of your pupilThis reduces the amount of light that enters your eye and strikesthe retina

Intensity depends on your distance from a light source Ifyou move away from a bare lightbulb you can see how theintensity of the light rapidly decreases Because light rays spreadout from the source less light energy strikes your retina thefarther away you are from the bulb

Correcting Vision ProblemsIf you have good vision you should be able to see objects

clearly when they are 25 cm or farther away from your eyes Asharp image of an object should be formed on your retinaHowever for many people the image is blurry or formed in thewrong place causing vision problems

Farsightedness If you can see distant objects clearly butcanrsquot bring nearby objects into focus then you are farsighted Inthis case the eyeball might be too short or the lens isnrsquot curvedenough to form a sharp image of nearby objects on the retinaas shown in Figure 22 To correct the problem convex lensescan be used to bend incoming light rays so they converge beforethey enter the eye

Experimenting withFocal LengthsProcedure1 Complete the safety form

2 Fill a glass test tube with

water and seal it with a

lid or stopper3 Type or print SULFUR

DIOXIDE in capital letters

on a piece of paper4 Set the test tube horizon-

tally over the words

Record your observations

5 Hold the tube at several

heights above the words

Record your observations

Analysis1 Describe how the words

changed as the height of

the test tube increased

2 Classify the image at each

height as real or virtual

Focal

point

Correctedfarsighted eye

Light fromnearby object

Focalpoint

Light fromnearby object

Farsighted eye

The focal length of a farsighted eye is too long to form

a sharp image of nearby objects on the retina

A convex lens in front of a farsighted eye enables a sharp

image of nearby objects to be formed on the retina

Figure 22 Farsightedness can

be corrected by convex lenses

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SECTION 3 Mirrors Lenses and the Eye 337

Self Check

1 Diagram how light rays from an object are reflected by

a convex mirror to form an image

2 Infer how the size of the image changes if an object

that is less than one focal length from a concave mirror

moves closer to the mirror

3 Explain how the focal length of a convex lens changes

as the sides of the lens become less curved

4 Compare the image of an object less than one focal

length from a convex lens with the image of an object

more than two focal lengths from the lens

5 Think Critically Describe the image formed by a light

source placed at the focal point of a convex lens

Summary

Mirrors

bull A plane mirror forms upright virtual images

bull The image formed by a concave mirror

depends on the location of the object relative

to the focal point

bull Convex mirrors always produce virtual upright

images that are smaller than the object

Lenses

bull The image formed by a convex lens depends

on the distance of the object from the lens

bull Concave lenses always form virtual upright

images that are smaller than the object

The Eye and Vision

bull The eye contains a lens that changes shape to

produce sharp images on the retina

bull Farsightedness occurs when the eye cannot

form a sharp image of nearby objects

Nearsightedness occurs when the eye cannot

form sharp images of distant objects

6 Calculate Object Distance If you looked through a

convex lens with a focal length of 15 cm and saw a

real inverted enlarged image what is the maximum

distance between the lens and the object

Nearsightedness If you have nearsighted friends you knowthat they can see only nearby objects clearly Their eyes cannotform a sharp image on the retina of an object that is far awayInstead the image is formed in front of the retina as shown inFigure 23 To correct this problem a nearsighted person canwear concave lenses Figure 23 shows how a concave lens causesincoming light rays from distant objects to diverge before theyreach the eye Then the rays can be focused by the eye to form asharp image on the retina

Figure 23 Nearsightedness can

be corrected with concave lenses

Focalpoint

Light fromdistant object

Nearsighted eye

Focalpoint

Light fromdistant object

Correctednearsighted eye

When a nearsighted person looks at distant objects a

sharp image is formed in front of the retina

A concave lens in front of a nearsighted eye makes light

rays diverge so a sharp image is formed on the retina

More Section Review gpesciencecom

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How can you see the back of your head You

can use two mirrors to view a reflection of a

reflection of the back of your head

Real-World ProblemHow many images are seen in two mirrors

Goal Infer how the number of images depends

on the angle between two mirrors

Materialsplane mirrors (2) protractor

masking tape paper clip

Safety Precautions

Handle glass mirrors and paper clips carefully

Procedure1 Complete the safety form

2 Lay one mirror on top of the other with the

mirror surfaces together Tape together one

side so they can open and close Use tape to

label them L and R for left and right

3 Open the mirrors and stand them on a sheet

of paper at an angle of 72deg

4 Bend one leg of a paper clip up 90deg and

place it close to the front of the R mirror

5 Count the number of images of the paper

clip you see in the R and L mirrors Record

these numbers in your data table

6 The mirrors create an image of a circle

divided into wedges Record the number

of wedges

7 Hold the R mirror still and slowly move the Lmirror to 90deg Record the numbers of images

of the clip and wedges in the circle Repeat

this time opening the mirrors to 120deg

Conclude and Apply1 Infer the relationship between the number

of wedges and paper clip images

2 Determine the angle that would divide a

circle into six wedges Hypothesize how

many images would be produced Test your

hypothesis

Reflections of Reflections

Demonstrate for younger students the

relationship between the angle of the

mirrors and the number of reflections

338 CHAPTER 11 Sound and Light

Angle

Number of Number

of Mirrors Paper Clip Images

of Wedges R L

72ordm

90ordm

120ordm

Images and Wedges Seen in the Mirrors

Do not write in this book

SECTION 4 Light and Color 339

Why Objects Have ColorWhy do some apples appear red while others look green or

yellow An objectrsquos color depends on the wavelengths of light itreflects Recall that white light is a blend of all colors of visiblelight When a red apple is struck by white light it reflects redlight back to your eyes and absorbs all of the other colorsFigure 24 shows white light striking a green leaf Only the wave-lengths corresponding to green light are reflected to your eyes

Although some objects appear to be black black isnrsquot acolor Black is the absence of visible light Objects that appearblack absorb all colors of light and reflect little or no light backto your eyes White objects appear to be white because theyreflect all colors of visible light

Why does a white object appear white

Colored Filters Wearing tinted glasses changesthe color of almost everything you see If the lensesare yellow the world takes on a golden glow If theyare rose colored everything looks rosy Somethingsimilar would occur if you placed a colored clearplastic sheet over this white page The paper wouldappear to be the same color as the plastic The plasticsheet and the tinted lenses are filters A filter is atransparent material that transmits one or more col-ors of light but absorbs all others The color of a fil-ter is the color of the light that it transmits

Light and Color

Reading Guide

Explain how you see color Describe the difference between

light color and pigment color Predict what happens when dif-

ferent colors are mixed

From traffic lights to great works of

art color is an important part of your

world

Review Vocabulary

retina inner layer of the eye con-

taining cells that convert light

images into electrical signals

New Vocabulary

bull pigment

Figure 24 This leaf absorbs all

wavelengths of visible light except

the wavelengths you see as green

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340 CHAPTER 11 Sound and Light

Looking Through Colored Filters Figure 25 shows howthe color of an object can change when you look at it throughvarious colored filters The cooler looks blue under white lightbecause it reflects only the wavelengths of blue light that strikeit If you look at the cooler through a blue filter the cooler stilllooks blue because the blue filter transmits the reflected bluelight However if you look at the cooler through a red filter thecooler seems black because the red filter blocks the blue lightreflected by the cooler

Why does a blue object appear black whenviewed through a red filter

Seeing ColorAs you approach a busy intersection the color of the traffic

light changes from green to yellow to red On the cross street thecolor changes from red to green At a busy intersection trafficsafety depends on your ability to detect color changes rapidlyHow do you see colors

Light and the Eye In a healthy eye light enters the eyethrough the cornea is focused by the lens and finally forms animage on the retina The retina is made up of two types of cellsthat absorb light as shown in Figure 26 When these cellsabsorb light energy chemical reactions convert light energy intonerve impulses that are transmitted to the brain One type ofcell in the retina called a cone enables you to distinguish colorsand detailed shapes of objects Cones need bright light to gener-ate nerve impulses so they do not operate in dim light As aresult even brightly colored objects might look gray or black indim light

Figure 25 The color of this

cooler changes when viewed

through different color filters

Topic Color BlindnessVisit for Web

links to information about the

causes of color blindness

Activity Research the causes

and types of color blindness Find

out how cones are related to the

ability to distinguish colors

gpesciencecom

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SECTION 4 Light and Color 341

Cones and Rods Your eyes have three types of cones each ofwhich responds to a different range of wavelengths Red conesrespond to mostly red and yellow light Green cones respond tomostly yellow and green light Blue cones respond to mostlyblue and violet light The second type of cell in the retina calleda rod is sensitive to dim light and enables you to see at nightHowever rod cells do not enable you to see colors

Interpreting Color Why does a bananalook yellow The light reflected by the

banana causes the cone cells that are sensitive to red and greenlight to send signals to your brain Your brain could get the samesignal if a mixture of red light and green light reached your eyesThis mixture also would cause your red and green cones torespond and you would see the color yellow As a result lightwith wavelengths corresponding to yellow light and light that isa mixture of red and green light both cause the color yellow tobe seen What happens when you look at a white shirt You seewhite when all wavelengths of visible light enters your eyes Thenall three sets of cones cells send signals to the brain The com-bination of these signals cause you to see the shirt as white

Color Blindness If one or more of your sets of cone cellsdo not function properly you might not be able to distinguishcertain colors This condition is called color blindness orcolor deficiency About eight percent of men and one-halfpercent of women have some form of color blindness Themost common form of color blindness makes it difficult todistinguish between red and green Figure 27 shows an imagethat is used in a test for redndashgreen color blindness Becausered and green are used in traffic signals drivers and pedestri-ans must be able to identify them

Retina

Rod

Cone

Lens

Figure 27 Color blindness is an

inherited sex-linked condition in

which certain sets of cones in the

retina do not function properly

Identify the number that you seein the dots

Figure 26 Light enters the eye

and focuses on the retina The two

types of light-detecting cells

that make up the retina

are called rods and cones

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342 CHAPTER 11 Sound and Light

Mixing ColorsIf you have ever browsed through a paint store you have

probably seen displays where customers can select paint samplesof almost every imaginable color The colors are a result of mix-tures of pigments For example you might have mixed blue andyellow paint to produce green paint A pigment is a coloredmaterial that is used to change the color of other substancesThe color of a pigment results from the different wavelengths oflight that the pigment reflects

Mixing Colored Lights From the glowing orange of a sun-set to the deep blue of a mountain lake all the colors you see canbe made by mixing three colors of light These three colorsmdashred green and bluemdashare the primary colors of light They cor-respond to the three different types of cones in the retina ofyour eye When mixed together in equal amounts they producewhite light as Figure 28 shows Mixing the primary colors indifferent proportions can produce the colors you see

What are the primary colors of light

Paint Pigments If you were to mix equal amounts of redgreen and blue paint would you get white paint If mixing col-ors of paint were like mixing colors of light you would but mix-ing paint is different Paints are made with pigments Pigmentsproduce color as a result of the wavelengths of light they reflectPaint pigments usually are made of chemical compounds suchas titanium oxide a bright white pigment and lead chromatewhich is used for painting yellow lines on highways

Figure 28 White light is pro-

duced when the three primary col-

ors of light are mixed in equal

amounts

Color for PhotosynthesisPlant pigments determinethe wavelengths oflight for photosynthesisLeaves usually look greenbecause of the pigmentchlorophyll Chlorophyllabsorbs most wave-lengths of visible lightexcept green which itreflects However not allplants are green Researchdifferent plant pigmentsto find out how they allowplant species to survive indiverse habitats

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SECTION 4 Light and Color 343

Self Check

1 Identity what colors are reflected and what colors are

absorbed if a white light shines on a red shirt

2 Discuss how the primary colors of light differ from the

primary pigment colors

3 Explain why a red apple would appear black if you

looked at it through a blue filter

4 Determine why a white fence appears to be white instead

of multicolored if all colors are present in white light

5 Think Critically Light reflected from an object passes

through a green filter then a red filter and finally a

blue filter What color will the object seem to be

Summary

Why Objects Have Color

bull The color of an object is determined by the

wavelengths of light it reflects

bull The color of a filter is the color of the light the

filter transmits

Seeing Color

bull Rod and cone cells are light-sensitive cells

found in the retina of the human eye

bull Rod cells are sensitive to dim light Cone cells

enable colors to be seen

bull There are three types of cone cells One type

responds to red light another to green light

and another to blue light

Mixing Colors

bull Red green and blue are the primary light

colors Any color of light can be created by

mixing these primary light colors

bull Any pigment color can be formed by mixing

the primary pigment colorsmdashmagenta cyan

and yellow

6 Use Percentages In the human eye there are about

120000000 rods If 90000000 rods trigger at once

what percentage of the total number of rods triggered

7 Convert Units The wavelengths of light are measured

in nanometers (nm) which equals 0000001 mm

Find the wavelength in mm of a light wave that has a

wavelength of 690 nm

Mixing Pigments You can make any pigment color by mixingdifferent amounts of the three primary pigmentsmdashmagenta(bluish red) cyan (greenish blue) and yellow In fact color print-ers use these pigments as well as black ink to make full-colorprints like the pages in this book A primary pigmentrsquos colordepends on the wavelengths of the light that it reflects Actuallypigments both absorb and reflect a range of colors in sending asingle color message to your eye For example in white lightyellow pigment appears yellow because it reflects red and greenlight but absorbs the other wavelengths of visible light The colorof a mixture of two primary pigments is determined by theprimary colors of light that both pigments reflect

Look at Figure 29 The area in the center where the colors alloverlap appears to be black because the three blended primarypigments absorb all the primary colors of light Recall that theprimary colors of light combine to produce white light They arecalled additive colors However when the primary pigment col-ors are combined they absorb all wavelengths of visible light andproduce black Because black results from the absence ofreflected light the primary pigments are called subtractive colors

Figure 29 The three primary

pigment colors appear to be black

when they are mixed

Describe how the primary pigmentcolors are similar to the primary col-ors of light

More Section Review gpesciencecom

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Design Your OwnDesign Your Own

344

Real-World ProblemWhat loud noises do you enjoy and which ones do you find annoying

Most people enjoy a music concert performed by their favorite artist or

the booming displays of fireworks on the Fourth of July Most people

enjoy these loud sounds for short periods of time However certain

other loud noises such as traffic sirens and loud talking can be

annoying Constant annoying noises are called noise pollution What

can be done to reduce noise pollution What types of barriers will best

block out noise pollution

Form a HypothesisBased on your experiences with loud noises form a hypothesis that

predicts the effectiveness of different types of barriers at blocking out

noise pollution

Test Your HypothesisMake a Plan

1 Complete the safety form

2 Decide what type of barriers or materials you will test

3 Describe exactly how you will use these materials

Goals Design an experiment

that tests the effective-

ness of various types of

barriers and materials

for blocking out noise

pollution

Test different types of

materials and barriers

to determine the best

noise blocks

Possible Materialsradio CD player horn

drum or other loud

noise source

shrubs trees concrete

walls brick walls stone

walls wooden fences

parked cars or hanging

laundry

sound meter

meterstick or metric tape

measure

Blocking NfisePollution

4 Identify the controls and variables you will use in your

experiment

5 List the steps you will use and describe each step precisely

6 Prepare a data table in your Science Journal to record your

measurements

7 Organize the steps of your experiment in logical order

Follow Your Plan

1 Ask your teacher to approve your plan and data table before

you start

2 Conduct your experiment as planned

3 Test each barrier two or three times

4 Record the results from each test in your data table in your Science Journal

Analyze Your Data1 Identify the barriers that most effectively reduced noise pollution

2 Identify the barriers that least effectively reduced noise pollution

3 Compare the effective barriers and identify common characteristics that might

explain why they reduced noise pollution

4 Compare the natural barriers you tested with the artificial barriers Which type

of barrier best reduced noise pollution

5 Compare the different types of materials the barriers were made of Which

type of material best reduced noise pollution

Conclude and Apply1 Evaluate whether your results support your hypothesis

2 Predict how your results would differ if you used a louder source of noise such

as a siren

3 Infer from your results how people living near a

busy street could reduce noise pollution

4 Identify major sources of noise pollution in or

near your home How could they be reduced

5 Research how noise pollution can be

unhealthy

LAB 345

Draw a poster illustrating how builders and

landscapers could use certain materials to

better insulate a home or office from excess

noise pollution

346 CHAPTER 11 Sound and Light

A Haiku GardenThe Four Seasons in Poems and Prints

by Stephen Addiss with Fumiko and Akira Yamamoto

Respond to the Reading1 How do the illustrations help the reader

better understand the poems2 What do you think is meant by the

word lingering in the Haiku about springsunlight

3 Linking Science and Writing Writeone haiku about summer and anotherabout fall In one poem use color tohelp you describe the season In theother use light or some property oflight to help describe the season

Research has deter-mined that there is a

connection between color and mood Warmcolors have longer wavelengths and can bemore stimulating Cool colors which haveshorter wavelengths tend to have a calmingor soothing effect on people Light and colorhave long been used as literary symbols Doesthe use of color change what you imaginewhen you read the haiku

UnderstandingLiteratureJapanese Haiku A haiku is a verse thatconsists of three lines and 17 syllables inthe Japanese language The first and thirdlines have five syllables each and themiddle line has seven syllables Why isimagination important in reading haiku

Lingering

in every pool of watermdash

spring sunlightIssa

Withered by winter

the sound of the windmdash

one-color worldBasho

Sound

1 Sound waves are compressional waves thattravel only in matter

2 The speed of sound in a material dependson the type of material as well as itstemperature

3 Loudness depends on a sound waversquos inten-sity Pitch depends on a sound waversquosfrequency

4 Sound waves are used in echolocationsonar and medical imaging

Reflection and Refractionof Light

1 Light can be absorbed reflected or trans-mitted by a material

2 When light waves are reflected theyobey the law of reflectionmdashthe angle ofincidence equals the angle of reflection

3 A light wave is refracted or bent whenit changes speed as it travels at an anglefrom one material to another

Mirrors Lenses andthe Eye

1 Plane mirrors form upright virtual images

2 Images formed by concave mirrors andconvex lenses depend on the location ofthe object relative to the focal point

3 Convex mirrors and concave lenses formvirtual upright images that are smallerthan the object

4 The lens in the human eye changes shape toproduce a sharp image on the retina

Light and Color

1 You see color when light is reflected offobjects and into your eyes

2 Cone cells in the retina are light-sensitivecells that enable you to distinguish colors

3 Red blue and green are the three primarycolors of light and can be mixed to form allother colors

4 The primary pigment colors are magentacyan and yellow

CHAPTER STUDY GUIDE 347

Use the Foldable you made at the beginningof the chapter to help you review sound and light

Interactive Tutor gpesciencecom

Complete each statement with the correctvocabulary word or phrase

1 A change in frequency due to a movingsound source is due to the

2 A flat smooth surface that reflects light andforms an image is a(n)

3 An object is if you can seethrough it clearly

4 The of a material indicates howmuch the speed of light in the materialchanges as light passes through

5 You can change the color of white paint byadding a(n) to it

6 A(n) is a reflecting surface thatcurves outward like the back of a spoon

7 The human perception of the intensity of asound wave is

Choose the word or phrase that best answerseach question

8 Which of the following best describes imageformation by a plane mirrorA) A real image is formed in front of the mirrorB) A real image is formed behind the mirrorC) A virtual image is formed in front of the

mirrorD) A virtual image is formed behind the mirror

9 For a sound with low pitch what else isalso always lowA) amplitude C) wavelengthB) frequency D) wave velocity

10 Which of the following occurs when asound source moves away from youA) The soundrsquos velocity decreasesB) The soundrsquos loudness increasesC) The soundrsquos frequency decreasesD) The soundrsquos frequency increases

Use the table below to answer question 11

11 Based on the data in the table abovewhich of the following would be the speedof sound in air at 30degCA) 3404 ms C) 3494 msB) 3464 ms D) 3534 ms

12 What happens to a light ray travelingparallel to the optical axis of a convexlens that passes through the lensA) It travels parallel to the optical axisB) It passes through the focal pointC) It is bent away from the optical axisD) It forms a virtual image

13 Light waves of which color are bent mostwhen passing through a prismA) blue C) violetB) red D) yellow

14 Which way does a concave lens bend lightA) toward its optical axisB) toward its centerC) toward its edgesD) toward its focal point

Speed of Sound in Air

Temp peed( s)

4

4

4

348 CHAPTER REVIEW

concave lens p 335concave mirror p 332convex lens p 333convex mirror p 333decibel p 322Doppler effect p 323index of refraction p 329intensity p 322

loudness p 322opaque p 327pigment p 342pitch p 323plane mirror p 331translucent p 327transparent p 327

Vocabulary PuzzleMaker gpesciencecom

Use the illustration below to answer question 15

15 Describe how the position of the candlechanged if the image of the candle movedaway from the focal point

16 Apply Acoustic scientists sometimes doresearch in rooms that absorb all soundwaves How could such a room be used tostudy how bats find their food

17 Compare White light passes through atranslucent pane of glass and shines on ashirt Both the translucent glass and theshirt appear green Compare the colors oflight that are absorbed and transmitted bythe glass and the shirt

18 Infer Most mammals including dogs andcats canrsquot see colors Infer how the retinaof a catrsquos eye might be different from theretina of a human eye

19 Determine whether a convex lens could forman image that is enlarged real and upright

20 Infer A car comes to a railroad crossingThe driver hears a trainrsquos whistle and itspitch becomes lower What can beassumed about how the train is moving

21 Compare and contrast the reflection of lightfrom a white wall with a rough surfacewith the reflection of light from a mirror

Optical axis

One

focal

length

Two

focal

lengths

Image

Ray A

Object

Focal

point

Interpreting Graphics 22 Infer why a convex mirror and a concavelens can never produce a real image

23 Predict what color a white shirt wouldappear to be if the light reflected from theshirt passed through a red filter and thenthrough a green filter

24 Explain why windows might begin to rattlewhen an airplane flies overhead

25 Communicate Some people enjoy usingsnowmobiles Others object to the noisethat they make Write a proposal for a pol-icy that seems fair to both groups for theuse of snowmobiles in a state park

CHAPTER REVIEW 349

Use the wave speed equation ν ƒλ to answer

questions 26 and 27

26 Calculate Frequency A sonar pulse has awavelength of 30 cm and a speed inwater of 1500 ms Find its frequency

27 Calculate Wavelength What is the wave-length of a sound wave with a fre-quency of 440 Hz if the speed of soundin air is 340 ms

28 Calculate Angle of Incidence A light ray isreflected from a mirror If the anglebetween the incident ray and thereflected ray is 136deg what is the angleof incidence

29 Determine Object Distance You hold anobject in front of a concave mirror witha focal length of 30 cm If you do notsee a reflected image how far from themirror is the object

30 Calculate Speed The speed of light in avacuum is 300000 kms If the index ofrefraction of water is 133 what is thespeed of light in water

More Chapter Review gpesciencecom

1 Which of the following describes the imageformed by a convex mirror

A enlarged

B inverted

C real

D virtual

Use the figure below to answer question 2

2 Which of the following describes a light raythat passes through the focal point andthen is reflected by the mirror

A It travels parallel to the optical axis

B It forms a real image

C It is reflected back through the focal point

D It forms a virtual image

3 Why does an apple look red

A It reflects red light

B It absorbs red light

C It reflects green and blue light

D It reflects all colors of light except red

Use the figure below to answer questions 4 and 5

4 When the primary colors of light are addedtogether what color appears in area H

A cyan

B magenta

C white

D yellow

5 When the primary colors of light are addedtogether what color appears in area G

A cyan

B magenta

C white

D yellow

6 Which of the following increases as the fre-quency of a sound increases

A amplitude

B intensity

C loudness

D pitch

Red Blue

Green

F

H

G K

Focal pointOptical axis

350 STANDARDIZED TEST PRACTICE

Record your answers on the answer sheet provided by your teacher or on a sheet of paper

STANDARDIZED TEST PRACTICE 351

7 Which of the following parts of the eyeenable you to see colors in bright light

A cone cells

B cornea

C lens

D rod cells

Use the graph below to answer questions 8 and 9

8 Determine how far in centimeters theimage is from the lens when the object is15 centimeters from the lens

9 How far in centimeters is the object fromthe lens when the image distance andobject distance are equal

10 A shirt has stripes that are black and whitein white light If green light shines on thisshirt what colors will the black and whitestripes be

11 If you are on a moving train what hap-pens to the pitch of a crossing bell as youapproach the crossing and then moveaway from the crossing

Use the figure below to answer question 12

12 Describe the vision problem show by thefigure and explain how this vision prob-lem can be corrected

13 Explain why the human eye can see colorsbetter in bright light than in dim light

Image Distance fora Convex Lens

Ima

ge

dis

tan

ce (

cm)

30

25

20

15

10

5 10 15 20 25 30

Object distance (cm)

Standardized Test Practice gpesciencecom

Note Units Read carefully and make note of the units used in

any measurement

  • Glencoe Physical Science with Earth Science
    • Student Edition Table of Contents
      • Unit 1 Science and Technology
        • Chapter 1 The Nature of Science
          • Launch Lab Understanding Measurements
          • Foldables
          • Section 1 The Methods of Science
            • Science Online
            • Integrate History
            • Integrate Earth Science
            • Science Online
              • Section 2 Standards of Measurement
                • Applying Math Centimeters
                • Integrate Earth Science
                • Science Online
                • MiniLAB Determining the Density of a Pencil
                • Visualizing SI Dimensions
                  • Section 3 Communicating with Graphs
                    • Applying Math Temperature
                    • MiniLAB Graphing Temperature Change
                    • Lab Whats my graph
                    • Lab Design Your Own - Developing a Measurement System
                    • Science and Language Arts Thinking in Pictures and Other Reports from My Life with Autism
                      • Chapter 1 Study Guide
                      • Chapter 1 Review
                      • Chapter 1 Standardized Test Practice
                        • Chapter 2 Science Technology and Society
                          • Lab Technology in Your Life
                          • Foldables
                          • Section 1 Science and Technology
                            • MiniLAB Researching the Past
                            • Visualizing Technology Supplying Basic Needs
                            • Science Online
                              • Section 2 Forces that Shape Technology
                                • MiniLAB Evaluating the Benefits and Consequences of Technology
                                • Integrate Environment
                                • Integrate History
                                • Applying Science What impact does the accident at Chernobyl have on the future of nuclear power
                                • Science Online
                                • Lab Who contributes CO2
                                  • Section 3 Developing Technology
                                    • Integrate Life Science
                                    • Integrate Career
                                    • Lab Model and Invent - Care Package
                                    • Oops Accidents in Science A Slippery Situation
                                      • Chapter 2 Study Guide
                                      • Chapter 2 Review
                                      • Chapter 2 Standardized Test Practice
                                          • Unit 2 Motion Forces and Energy
                                            • Chapter 3 Motion Acceleration and Forces
                                              • Launch Lab Compare Speeds
                                              • Foldables
                                              • Section 1 Describing Motion
                                                • MiniLAB Measuring Average Speed
                                                • Science Online
                                                • Applying Math Average Speed
                                                • Integrate Astronomy
                                                • Science Online
                                                  • Section 2 Acceleration
                                                    • Integrate History
                                                    • Visualizing Acceleration
                                                      • Section 3 Motion and Forces
                                                        • Science Online
                                                        • MiniLAB Comparing Friction
                                                        • Lab Force and Acceleration
                                                        • Lab Design Your Own - Comparing Motion from Different Forces
                                                        • Science and Language Arts A Brave and Startling Truth
                                                          • Chapter 3 Study Guide
                                                          • Chapter 3 Review
                                                          • Chapter 3 Standardized Test Practice
                                                            • Chapter 4 The Laws of Motion
                                                              • Launch Lab The Force of Gravity
                                                              • Foldables
                                                              • Section 1 The First Two Laws of Motion
                                                                • MiniLAB Observing Inertia
                                                                • Science Online
                                                                • Applying Math The Acceleration of a Sled Solve a Simple Equation
                                                                  • Section 2 Gravity
                                                                    • Science Online
                                                                    • Integrate Earth Science
                                                                    • MiniLAB Observing Centripetal Force
                                                                    • Lab Gravity and Air Resistance
                                                                      • Section 3 The Third Law of Motion
                                                                        • Integrate Career
                                                                        • Visualizing Rocket Motion
                                                                        • Applying Math The Momentum of a Sprinter
                                                                        • Lab The Momentum of Colliding Objects
                                                                        • Science and History Newton and the Plague
                                                                          • Chapter 4 Study Guide
                                                                          • Chapter 4 Review
                                                                          • Chapter 4 Standardized Test Practice
                                                                            • Chapter 5 Energy
                                                                              • Launch Lab Energy Conversions
                                                                              • Foldables
                                                                              • Section 1 The Nature of Energy
                                                                                • Science Online
                                                                                • Applying Math Kinetic Energy
                                                                                • MiniLAB Interpreting Data from a Slingshot
                                                                                • Integrate Language Arts
                                                                                • Applying Math Gravitational Potential Energy
                                                                                • Lab Bouncing Balls
                                                                                  • Section 2 Conservation of Energy
                                                                                    • Visualizing Energy Transformations
                                                                                    • Integrate Environment
                                                                                    • MiniLAB Transforming Energy in a Paper Clip
                                                                                    • Science Online
                                                                                    • Integrate Health
                                                                                    • Lab Design Your Own - Swinging Energy
                                                                                    • Science and History The Impossible Dream
                                                                                      • Chapter 5 Study Guide
                                                                                      • Chapter 5 Review
                                                                                      • Chapter 5 Standardized Test Practice
                                                                                        • Chapter 6 Work and Machines
                                                                                          • Launch Lab Doing Work with a Simple Machine
                                                                                          • Foldables
                                                                                          • Section 1 Work
                                                                                            • Integrate Language Arts
                                                                                            • Applying Math Work
                                                                                            • MiniLAB Calculating Your Work and Power
                                                                                            • Applying Math Power
                                                                                              • Section 2 Using Machines
                                                                                                • MiniLAB Machines Multiplying Force
                                                                                                • Science Online
                                                                                                • Integrate Chemistry
                                                                                                  • Section 3 Simple Machines
                                                                                                    • Integrate History
                                                                                                    • Visualizing Levers in the Human Body
                                                                                                    • Science Online
                                                                                                    • Lab Levers
                                                                                                    • Lab Model and Invent - Using Simple Machines
                                                                                                    • Science and Society The Science of Very Very Small
                                                                                                      • Chapter 6 Study Guide
                                                                                                      • Chapter 6 Review
                                                                                                      • Chapter 6 Standardized Test Practice
                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                          • Launch Lab Relative Sizes of Earth the Moon and the Sun
                                                                                                          • Foldables
                                                                                                          • Section 1 Earth in Space
                                                                                                            • Science Online
                                                                                                            • Integrate Physics
                                                                                                              • Section 2 Time and Seasons
                                                                                                                • MiniLAB Modeling the Suns Rays at Solstice
                                                                                                                • Lab Comparing the Angle of Sunlight to Intensity
                                                                                                                  • Section 3 Earths Moon
                                                                                                                    • Applying Math Tides
                                                                                                                    • MiniLAB Modeling Phases and Eclipses
                                                                                                                    • Integrate History
                                                                                                                    • Integrate History
                                                                                                                    • Science Online
                                                                                                                    • Visualizing Water on the Moon
                                                                                                                    • Lab Identifying the Moons Surface Features and Apollo Landing Sites
                                                                                                                    • Oops Accidents in Science Even Great Scientists Make Mistakes
                                                                                                                      • Chapter 7 Study Guide
                                                                                                                      • Chapter 7 Review
                                                                                                                      • Chapter 7 Standardized Test Practice
                                                                                                                        • Chapter 8 The Solar System
                                                                                                                          • Launch Lab The Size of the Solar System
                                                                                                                          • Foldables
                                                                                                                          • Section 1 Planet Motion
                                                                                                                            • Integrate History
                                                                                                                            • MiniLAB Plotting Retrograde Motion
                                                                                                                            • Integrate Physics
                                                                                                                            • Applying Math Heliocentric Longitude (HL)
                                                                                                                              • Section 2 The Inner Planets
                                                                                                                                • Science Online
                                                                                                                                • Integrate Chemistry
                                                                                                                                • Lab Interpreting Features of Marss Surface
                                                                                                                                  • Section 3 The Outer Planets
                                                                                                                                    • Integrate Language Arts
                                                                                                                                    • Visualizing What Galileo Saw
                                                                                                                                    • Science Online
                                                                                                                                    • MiniLAB Comparing Sizes of Outer and Inner Planets
                                                                                                                                      • Section 4 Life in the Solar System
                                                                                                                                        • Lab Design Your Own - Testing Unknown Soil Samples for Life
                                                                                                                                        • Science Stats Night Sky Wonders
                                                                                                                                          • Chapter 8 Study Guide
                                                                                                                                          • Chapter 8 Review
                                                                                                                                          • Chapter 8 Standardized Test Practice
                                                                                                                                              • Unit 3 Energy in Motion
                                                                                                                                                • Chapter 9 Heat and States of Matter
                                                                                                                                                  • Launch Lab Expansion of a Gas
                                                                                                                                                  • Foldables
                                                                                                                                                  • Section 1 Temperature and Thermal Energy
                                                                                                                                                    • Applying Math Converting to Celsius
                                                                                                                                                    • Science Online
                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                    • Applying Math Change in Thermal Energy
                                                                                                                                                      • Section 2 States of Matter
                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                        • Science Online
                                                                                                                                                        • MiniLAB Comparing States of Water
                                                                                                                                                          • Section 3 Transferring Thermal Energy
                                                                                                                                                            • MiniLAB Comparing Thermal Conductors
                                                                                                                                                            • Visualizing Convection Currents
                                                                                                                                                            • Lab Convection in Gases and Liquids
                                                                                                                                                              • Section 4 Using Thermal Energy
                                                                                                                                                                • Integrate History
                                                                                                                                                                • Science Online
                                                                                                                                                                • Lab Conduction in Gases
                                                                                                                                                                • Science Stats Surprising Thermal Energy
                                                                                                                                                                  • Chapter 9 Study Guide
                                                                                                                                                                  • Chapter 9 Review
                                                                                                                                                                  • Chapter 9 Standardized Test Practice
                                                                                                                                                                    • Chapter 10 Waves
                                                                                                                                                                      • Launch Lab How do waves transfer energy
                                                                                                                                                                      • Foldables
                                                                                                                                                                      • Section 1 The Nature of Waves
                                                                                                                                                                        • Visualizing Formation of Ocean Waves
                                                                                                                                                                        • Science Online
                                                                                                                                                                          • Section 2 Wave Properties
                                                                                                                                                                            • MiniLAB Observing Wavelength
                                                                                                                                                                            • Integrate Social Studies
                                                                                                                                                                            • Applying Math The Speed of Sound
                                                                                                                                                                            • Lab Wave Speed and Tension
                                                                                                                                                                              • Section 3 The Behavior of Waves
                                                                                                                                                                                • Science Online
                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                • MiniLAB Experimenting with Resonance
                                                                                                                                                                                • Lab Measuring Wave Properties
                                                                                                                                                                                • Science and History Making Waves
                                                                                                                                                                                  • Chapter 10 Study Guide
                                                                                                                                                                                  • Chapter 10 Review
                                                                                                                                                                                  • Chapter 10 Standardized Test Practice
                                                                                                                                                                                    • Chapter 11 Sound and Light
                                                                                                                                                                                      • Launch Lab What sound does a ruler make
                                                                                                                                                                                      • Foldables
                                                                                                                                                                                      • Section 1 Sound
                                                                                                                                                                                        • MiniLAB Comparing Intensity
                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                        • Science Online
                                                                                                                                                                                        • Applying Math Using Sonar
                                                                                                                                                                                          • Section 2 Reflection and Refraction of Light
                                                                                                                                                                                          • Section 3 Mirrors Lenses and the Eye
                                                                                                                                                                                            • Visualizing Images Formed by a Convex Lens
                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                            • MiniLAB Experimenting with Focal Lengths
                                                                                                                                                                                            • Lab Reflections of Reflections
                                                                                                                                                                                              • Section 4 Light and Color
                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Lab Design Your Own - Blocking Noise Pollution
                                                                                                                                                                                                • Science and Language Arts A Haiku Garden The Four Seasons in Poems and Print
                                                                                                                                                                                                  • Chapter 11 Study Guide
                                                                                                                                                                                                  • Chapter 11 Review
                                                                                                                                                                                                  • Chapter 11 Standardized Test Practice
                                                                                                                                                                                                    • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                      • Launch Lab Global Jigsaw Puzzle
                                                                                                                                                                                                      • Foldables
                                                                                                                                                                                                      • Section 1 Evolution of Earths Crust
                                                                                                                                                                                                        • Applying Math Spreading Distances
                                                                                                                                                                                                        • Integrate Physics
                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                          • Section 2 Earthquakes
                                                                                                                                                                                                            • MiniLAB Demonstrating Four Types of Stress
                                                                                                                                                                                                            • Visualizing Earthquake-Proof Buildings
                                                                                                                                                                                                              • Section 3 Earths Interior
                                                                                                                                                                                                              • Section 4 Volcanoes
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • MiniLAB Modeling Lava Viscosity
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                • Lab A Case for Pacific Plate Motion
                                                                                                                                                                                                                • Lab Earthquake Earthquake Wheres the earthquake
                                                                                                                                                                                                                • Science and History Volcano Weather
                                                                                                                                                                                                                  • Chapter 12 Study Guide
                                                                                                                                                                                                                  • Chapter 12 Review
                                                                                                                                                                                                                  • Chapter 12 Standardized Test Practice
                                                                                                                                                                                                                      • Unit 4 Forms of Energy
                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                          • Launch Lab Electric Circuits
                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                          • Section 1 Electric Charge
                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                            • Visualizing Lightning
                                                                                                                                                                                                                            • MiniLAB Investigate Charged Objects
                                                                                                                                                                                                                              • Section 2 Electric Current
                                                                                                                                                                                                                                • MiniLAB Investigating Battery Addition
                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                • Lab Identifying Conductors and Insulators
                                                                                                                                                                                                                                  • Section 3 Electrical Energy
                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                    • Applying Math Power Used by a Clothes Dryer
                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                    • Applying Math Electrical Energy Used by a Microwave Oven
                                                                                                                                                                                                                                    • Lab Design Your Own - Comparing Series and Parallel Circuits
                                                                                                                                                                                                                                    • Science and Language Arts Invisible Man
                                                                                                                                                                                                                                      • Chapter 13 Study Guide
                                                                                                                                                                                                                                      • Chapter 13 Review
                                                                                                                                                                                                                                      • Chapter 13 Standardized Test Practice
                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                          • Launch Lab The Strength of Magnets
                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                          • Section 1 Magnetism
                                                                                                                                                                                                                                            • MiniLAB Observing Magnetic Interference
                                                                                                                                                                                                                                            • Integrate Earth Science
                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                            • Applying Science How can magnetic parts of a junk car be salvaged
                                                                                                                                                                                                                                            • MiniLAB Making Your Own Compass
                                                                                                                                                                                                                                              • Section 2 Electricity and Magnetism
                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                  • Section 3 Producing Electric Current
                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                    • Visualizing Motors and Generators
                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                    • Lab Electricity and Magnetism
                                                                                                                                                                                                                                                    • Lab Design Your Own - Controlling Electromagnets
                                                                                                                                                                                                                                                    • Science and History Body Art
                                                                                                                                                                                                                                                      • Chapter 14 Study Guide
                                                                                                                                                                                                                                                      • Chapter 14 Review
                                                                                                                                                                                                                                                      • Chapter 14 Standardized Test Practice
                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                          • Launch Lab Can electromagnetic waves change materials
                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                          • Section 1 What are electromagnetic waves
                                                                                                                                                                                                                                                            • MiniLAB Investigating Electromagnetic Waves
                                                                                                                                                                                                                                                            • Applying Math The Speed of Light in Water
                                                                                                                                                                                                                                                              • Section 2 The Electromagnetic Spectrum
                                                                                                                                                                                                                                                                • MiniLAB Heating with Microwaves
                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                • Lab The Shape of Satellite Dishes
                                                                                                                                                                                                                                                                  • Section 3 Radio Communication
                                                                                                                                                                                                                                                                    • Visualizing Radio Broadcasts
                                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Lab Use the Internet - Radio Frequencies
                                                                                                                                                                                                                                                                    • Science and History Riding a Beam of Light
                                                                                                                                                                                                                                                                      • Chapter 15 Study Guide
                                                                                                                                                                                                                                                                      • Chapter 15 Review
                                                                                                                                                                                                                                                                      • Chapter 15 Standardized Test Practice
                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                          • Launch Lab Heating with Solar Energy
                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                          • Section 1 Fossil Fuels
                                                                                                                                                                                                                                                                            • Visualizing The Formation of Fossil Fuels
                                                                                                                                                                                                                                                                            • MiniLAB Designing an Efficient Water Heater
                                                                                                                                                                                                                                                                              • Section 2 Nuclear Energy
                                                                                                                                                                                                                                                                                • Integrate Earth Science
                                                                                                                                                                                                                                                                                • Integrate Social Science
                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                • Applying Science Can a contaminated radioactive site be reclaimed
                                                                                                                                                                                                                                                                                  • Section 3 Renewable Energy Sources
                                                                                                                                                                                                                                                                                    • MiniLAB Using Solar Power at Home
                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                    • Lab Solar Heating
                                                                                                                                                                                                                                                                                    • Lab Use the Internet How much does energy really cost
                                                                                                                                                                                                                                                                                    • Science and Society Reacting to Nuclear Energy
                                                                                                                                                                                                                                                                                      • Chapter 16 Study Guide
                                                                                                                                                                                                                                                                                      • Chapter 16 Review
                                                                                                                                                                                                                                                                                      • Chapter 16 Standardized Test Practice
                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                          • Lab Atmospheric Pressure
                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                          • Section 1 Earths Atmosphere
                                                                                                                                                                                                                                                                                            • MiniLAB Visualizing Convection
                                                                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                                                                            • Lab Visualizing a Temperature Inversion
                                                                                                                                                                                                                                                                                              • Section 2 Weather
                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Coriolis Effect
                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                  • Section 3 Climate
                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                    • Visualizing Earths Biogeophysical System
                                                                                                                                                                                                                                                                                                      • Section 4 Earths Changing Climates
                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                        • Applying Math Carbon Dioxide (CO2) Concentration
                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Investigating Microclimate
                                                                                                                                                                                                                                                                                                        • Science and Language Arts The Grapes of Wrath
                                                                                                                                                                                                                                                                                                          • Chapter 17 Study Guide
                                                                                                                                                                                                                                                                                                          • Chapter 17 Review
                                                                                                                                                                                                                                                                                                          • Chapter 17 Standardized Test Practice
                                                                                                                                                                                                                                                                                                              • Unit 5 Matter and Earth Materials
                                                                                                                                                                                                                                                                                                                • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                  • Launch Lab Demonstrate the Distillation of Water
                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                  • Section 1 Composition of Matter
                                                                                                                                                                                                                                                                                                                    • Visualizing Elements
                                                                                                                                                                                                                                                                                                                    • MiniLAB Classifying Materials
                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                    • Lab Comparing Pure Substances and Mixtures
                                                                                                                                                                                                                                                                                                                      • Section 2 Properties of Matter
                                                                                                                                                                                                                                                                                                                        • Integrate Environment
                                                                                                                                                                                                                                                                                                                        • MiniLAB Separating Ink
                                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                                        • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                        • Applying Math The Law of Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Measuring the Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Science Stats Intriguing Elements
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Study Guide
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Review
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                            • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                              • Launch Lab Inferring What You Cant Observe
                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                              • Section 1 Structure of the Atom
                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling an Aluminum Atom
                                                                                                                                                                                                                                                                                                                                • Visualizing The Atomic Model
                                                                                                                                                                                                                                                                                                                                  • Section 2 Masses of Atoms
                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                    • Applying Science How can radioactive isotopes help tell time
                                                                                                                                                                                                                                                                                                                                      • Section 3 The Periodic Table
                                                                                                                                                                                                                                                                                                                                        • MiniLAB Organizing a Personal Periodic Table
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Career
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                                                                                                                                                                        • Lab A Periodic Table of Foods
                                                                                                                                                                                                                                                                                                                                        • Lab Use the Internet Whats in a name
                                                                                                                                                                                                                                                                                                                                        • Science and History A Chilling Story
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Study Guide
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Review
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                            • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                              • Launch Lab Earth Materials at Home and School
                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                              • Section 1 Minerals
                                                                                                                                                                                                                                                                                                                                                • MiniLAB Identifying Salts Crystal System
                                                                                                                                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                • Lab Be a Mineral Detective
                                                                                                                                                                                                                                                                                                                                                  • Section 2 Igneous Rocks
                                                                                                                                                                                                                                                                                                                                                    • Applying Math Extrusive Igneous Rock Classification
                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                      • Section 3 Sedimentary Rocks
                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Evaporites
                                                                                                                                                                                                                                                                                                                                                          • Section 4 Metamorphic Rocks and the Rock Cycle
                                                                                                                                                                                                                                                                                                                                                            • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                            • Visualizing Shock Metamorphic Rock
                                                                                                                                                                                                                                                                                                                                                            • Lab Identifying Rocks
                                                                                                                                                                                                                                                                                                                                                            • Science and Society Earth Materials at Work
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Study Guide
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Review
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                  • Launch Lab Have you got the time
                                                                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                                                                  • Section 1 Weathering and Soil
                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing a Disappearing Seasoning
                                                                                                                                                                                                                                                                                                                                                                    • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                    • Lab Graphing Soil Textures
                                                                                                                                                                                                                                                                                                                                                                      • Section 2 Shaping the Landscape
                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Runoff
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                          • Section 3 Groundwater
                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Porosity Volume
                                                                                                                                                                                                                                                                                                                                                                            • Visualizing The Role of Groundwater in Shaping Earths Surface
                                                                                                                                                                                                                                                                                                                                                                            • Integrate Environment
                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                              • Section 4 Geologic Time
                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                                                                                                • Lab Its about time - relative that is
                                                                                                                                                                                                                                                                                                                                                                                • Science and Society Tapping into the Underground
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Review
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                      • Unit 6 Interactions of Matter
                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                          • Lab Chemical Bonds and Mixing
                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Stability in Bonding
                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                            • Lab Atomic Trading Cards
                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Types of Bonds
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Health
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                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Observing a Bond Type
                                                                                                                                                                                                                                                                                                                                                                                                • Visualizing Polar Molecules
                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Writing Formulas and Naming Compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
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                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Science Can you name binary ionic compounds
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                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Model and Invent - Modeling Chemical Bonding
                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Sticky Subject
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Study Guide
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                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
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                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Chemical Equations
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                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Classifying Chemical Reactions
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                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
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                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab To Glow or Not to Glow
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Investigating Reaction Conditions
                                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Clumsy Move Pays Off
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Study Guide
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                                                                                                                                                                                                                                                                                                                                                                                                                            • Visualizing Metal Alloys
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                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Solubility and Concentration
                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
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                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing Acid Relief
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                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Strength of Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Determining Acidity
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                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and Society Acid Rain
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Study Guide
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Page 14: 706 S1 318-326 GPS09 - Light-and-Sound - home · PDF fileWhat sound does a ruler make? ... sound waves cannot travel in empty space where there are no particles. ... sound travels

SECTION 3 Mirrors Lenses and the Eye 331

Light RaysLight sources send out light waves in all directions These

waves spread out like ripples on the surface of water spread outfrom the point of impact of a pebble You can think of the lightcoming from the source as being many narrow beams of light trav-eling in all directions Each narrow light beam is called a light ray

MirrorsA mirror is any surface that produces a regular reflection A pool

of still water a metal pan and even the back of a shiny spoon can bemirrors Mirrors can be flat curved inward or curved outward

Plane Mirrors A flat smooth mirror is a plane mirror Whenyou look in a plane mirror your image appears upright If youstand 1 m from the mirror your image appears 1 m behind themirror or 2 m from you In fact your image is what a friend stand-ing 2 m from you would see Figure 14 shows how your image isformed First light rays from a light source strike you Every pointthat is struck by the light rays reflects these rays so they travel out-ward in all directions If your friend were looking at you thesereflected light rays coming from you would enter her eyes so shecould see you However if a mirror is placed between you and yourfriend light rays are reflected from the mirror back to your eyes

Mirrors Lenses andthe Eye

Reading Guide

Describe how images are formed

by three types of mirrors Explain how convex and concave

lenses form images Explain how the human eye

enables you to see Describe how lenses are used to

correct vision problems

Mirrors and lenses are used in optical

instruments such as cameras and

telescopes

Review Vocabulary

reflection the process of changing

direction after striking a surface

New Vocabulary

bull plane mirror

bull concave mirror

bull convex mirror

bull convex lens

bull concave lens

Figure 14 Seeing an image of

yourself in a mirror involves two

sets of reflections light rays are

reflected from you and then are

reflected by the mirror

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332 CHAPTER 11 Sound and Light

Virtual and Real Images The forma-tion of an image by a plane mirror isshown in Figure 15 Your brain assumesthat light rays travel in a straight line As aresult rays that enter your eyes seem tocome from behind the mirror This makesthe image seem to be behind the mirrorHowever no light rays actually passthrough the place where the image seemsto be located This type of image is called avirtual image Plane mirrors always formvirtual images If light rays from an objectpass through the location of the image theimage is called a real image Curved mir-rors can form both real and virtual images

Concave Mirrors If the surface of a mirror is curved inwardit is called a concave mirror as shown in Figure 16 The opticalaxis is an imaginary straight line drawn perpendicular to thesurface of the mirror at its center Every light ray traveling par-allel to the optical axis is reflected through a point on the opti-cal axis called the focal point The distance from the center ofthe mirror to the focal point is called the focal length

The image formed by a concave mirror depends on the loca-tion of the object relative to the focal point Figure 16 shows acandle located more than twice the focal length from the mirrorAlthough many light rays come from each point on the candleonly two rays from the same point are shown Ray A passesthrough the focal point and then reflects off the mirror movingparallel to the optical axis Ray B travels parallel to the opticalaxis before reflecting off the mirror and passing through thefocal point The point where the two rays meet is the location ofthe image of the original point on the candle The image formedis a real image because light rays from the candle pass throughthe place where the image is located

Figure 16 Rays A and B start from the same

place on the candle travel in different directions

and meet again on the reflected image

Diagram how two other points on the image ofthe candle are formed

Figure 15 Your brain interprets

the light rays reflected by the

mirror as coming from a point

behind the mirror

Infer how the size of your imagein a plane mirror depends on yourdistance from the mirror

Focalpoint

Optical axis

Ray B

Ray A

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SECTION 3 Mirrors Lenses and the Eye 333

Images Produced by a ConcaveMirror When an object is between oneand two focal lengths from a concavemirror the image is real inverted andlarger than the object An object closerthan one focal length from a concavemirror produces a virtual image that isupright and larger than the object Noimage is produced if the object islocated at the focal point

Convex Mirrors When you are in astore look up toward one of the backcorners or at the end of an aisle to see ifa large rounded mirror is mountedthere You can see a large area of the store in such a mirror Amirror that curves outward like the back of a spoon is called aconvex mirror Light rays that hit a convex mirror diverge orspread apart after they are reflected Figure 17 shows how therays from an object are reflected by a convex mirror to form animage The reflected rays diverge and never meet so a convexmirror forms only a virtual image The image also is upright andsmaller than the actual object is

Describe the image formed by a convex mirror

LensesWhat do your eyes have in common with cameras eyeglasses

and microscopes Each of these contains at least one lens A lens is atransparent object with at least one curved surface that causes lightrays to refract The image that a lens forms depends on the shape ofthe lens Like curved mirrors lenses can be convex or concave

Convex Lenses A convex lens is thicker in the middle than atthe edges Its optical axis is an imaginary straight line that is per-pendicular to the surface of the lens at its thickest point When lightrays approach a convex lens traveling parallel to its opticalaxis the rays are refracted toward the center of the lens asin Figure 18 Light rays traveling along the optical axis arenot bent at all All light rays traveling parallel to the opti-cal axis are refracted so they pass through a single pointwhich is the focal point of the lens The less curved thesides of the lens the less light rays are bent As a resultlenses with flatter sides have longer focal lengths Figure 19

on the next page shows that convex lenses can form eitherreal or virtual images

Figure 18 Convex lenses are

thicker in the middle than at the

edges Light rays that are parallel

to the optical axis are refracted so

that they pass through the focal

point A light ray that passes

through the center of the lens is

not refracted

Figure 17 A convex mirror

forms a reduced upright virtual

image

Optical axis

Ray A

Ray B

Focallength

Focalpoint

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Figure 19

VISUALIZING IMAGES FORMED BY A CONVEX LENS

334 CHAPTER 11 Sound and Light

Aconvex lens can form images that are real or virtual enlarged or reduced and upright orinverted Just as for a concave mirror the type of image formed by a convex lens depends on thelocation of the object relative to the focal point of the lens

Optical axis

One

focal

length

Two

focal

lengthsRay B

Image

Ray A

Object

Focal

point

Optical axis

One

focal

length

Two

focal

lengths

Ray B

Ray AObject

Image

Focal

point

Optical axis

Ray B

ObjectRay A

One

focal

length

Focal

pointImage

If the object is more than two focal lengths from the lens the image formed is real inverted andsmaller than the object As the object moves farther from the lens the image becomes smaller

If the object is between one and two focal lengths from the lens the image formed is real invertedand larger than the object As the object moves closer to the focal point the image becomes larger

If the object is less than one focal length from the lens the image is virtual upright and larger thanthe object The image is virtual because the light rays from the object diverge after they pass throughthe lens The image becomes smaller as the object moves closer to the lens

SECTION 3 Mirrors Lenses and the Eye 335

Concave Lenses A concave lens is thinnerin the middle and thicker at the edges Asshown in Figure 20 light rays that passthrough a concave lens bend away from theoptical axis The rays spread out and nevermeet so a real image is never formed Theimage is always virtual upright and smallerthan the object is Concave lenses are used insome types of eyeglasses and some telescopesConcave lenses usually are used in combinationwith other lenses

What type of image is formed by a concave lens

The Human EyeWhat determines how well you can see the words on this

page If you donrsquot need eyeglasses the structure of your eye givesyou the ability to focus on these words and other objects aroundyou Look at Figure 21 Light enters your eye through a trans-parent covering on your eyeball called the cornea The corneacauses light rays to bend so that they converge The light thenpasses through an opening called the pupil Behind the pupil isa flexible convex lens Muscles attached to the lens change itsshape to help focus light forming a sharp image on your retina

The retina is the inner lining of your eye The retina con-tains light-sensitive cells that convert an image into electricalsignals These signals then are carried along the optic nerve toyour brain to be interpreted With this complex structurethe human eye is capable of seeing clearly in bright and dimconditions focusing on both near and far objects and alsodetecting colors

Figure 20 A concave lens

refracts light rays so they spread

out away from the optical axis

Classify Is a concave lens mostlike a concave mirror or a convexmirror

Optical axis

Retina

Focalpoint

Pupil

Cornea

Lens

Optic nerve

Figure 21 The cornea and lens in your eye

bend light rays so that a sharp image is

formed on the retina

Eye Doctors Optometristsand ophthalmologists treatmany different eye prob-lems They often useadvanced technology todiagnose and correct mal-functioning parts of theeye Research an eye prob-lem and how it is treatedWrite a paragraph describ-ing what parts of the eyeare affected by the problemand how doctors correct it

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336 CHAPTER 11 Sound and Light

Brightness and Intensity The human eye can adjust to thebrightness of the light that strikes it If you step outside on asunny day you may have to shade your eyes against the intensityof the sunlight Light intensity is the amount of light energy thatstrikes a certain area each second Brightness is the human per-ception of light intensity Sunlight seems bright because a largeamount of light energy strikes your retina each second Youreyes respond to bright light by decreasing the size of your pupilThis reduces the amount of light that enters your eye and strikesthe retina

Intensity depends on your distance from a light source Ifyou move away from a bare lightbulb you can see how theintensity of the light rapidly decreases Because light rays spreadout from the source less light energy strikes your retina thefarther away you are from the bulb

Correcting Vision ProblemsIf you have good vision you should be able to see objects

clearly when they are 25 cm or farther away from your eyes Asharp image of an object should be formed on your retinaHowever for many people the image is blurry or formed in thewrong place causing vision problems

Farsightedness If you can see distant objects clearly butcanrsquot bring nearby objects into focus then you are farsighted Inthis case the eyeball might be too short or the lens isnrsquot curvedenough to form a sharp image of nearby objects on the retinaas shown in Figure 22 To correct the problem convex lensescan be used to bend incoming light rays so they converge beforethey enter the eye

Experimenting withFocal LengthsProcedure1 Complete the safety form

2 Fill a glass test tube with

water and seal it with a

lid or stopper3 Type or print SULFUR

DIOXIDE in capital letters

on a piece of paper4 Set the test tube horizon-

tally over the words

Record your observations

5 Hold the tube at several

heights above the words

Record your observations

Analysis1 Describe how the words

changed as the height of

the test tube increased

2 Classify the image at each

height as real or virtual

Focal

point

Correctedfarsighted eye

Light fromnearby object

Focalpoint

Light fromnearby object

Farsighted eye

The focal length of a farsighted eye is too long to form

a sharp image of nearby objects on the retina

A convex lens in front of a farsighted eye enables a sharp

image of nearby objects to be formed on the retina

Figure 22 Farsightedness can

be corrected by convex lenses

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SECTION 3 Mirrors Lenses and the Eye 337

Self Check

1 Diagram how light rays from an object are reflected by

a convex mirror to form an image

2 Infer how the size of the image changes if an object

that is less than one focal length from a concave mirror

moves closer to the mirror

3 Explain how the focal length of a convex lens changes

as the sides of the lens become less curved

4 Compare the image of an object less than one focal

length from a convex lens with the image of an object

more than two focal lengths from the lens

5 Think Critically Describe the image formed by a light

source placed at the focal point of a convex lens

Summary

Mirrors

bull A plane mirror forms upright virtual images

bull The image formed by a concave mirror

depends on the location of the object relative

to the focal point

bull Convex mirrors always produce virtual upright

images that are smaller than the object

Lenses

bull The image formed by a convex lens depends

on the distance of the object from the lens

bull Concave lenses always form virtual upright

images that are smaller than the object

The Eye and Vision

bull The eye contains a lens that changes shape to

produce sharp images on the retina

bull Farsightedness occurs when the eye cannot

form a sharp image of nearby objects

Nearsightedness occurs when the eye cannot

form sharp images of distant objects

6 Calculate Object Distance If you looked through a

convex lens with a focal length of 15 cm and saw a

real inverted enlarged image what is the maximum

distance between the lens and the object

Nearsightedness If you have nearsighted friends you knowthat they can see only nearby objects clearly Their eyes cannotform a sharp image on the retina of an object that is far awayInstead the image is formed in front of the retina as shown inFigure 23 To correct this problem a nearsighted person canwear concave lenses Figure 23 shows how a concave lens causesincoming light rays from distant objects to diverge before theyreach the eye Then the rays can be focused by the eye to form asharp image on the retina

Figure 23 Nearsightedness can

be corrected with concave lenses

Focalpoint

Light fromdistant object

Nearsighted eye

Focalpoint

Light fromdistant object

Correctednearsighted eye

When a nearsighted person looks at distant objects a

sharp image is formed in front of the retina

A concave lens in front of a nearsighted eye makes light

rays diverge so a sharp image is formed on the retina

More Section Review gpesciencecom

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How can you see the back of your head You

can use two mirrors to view a reflection of a

reflection of the back of your head

Real-World ProblemHow many images are seen in two mirrors

Goal Infer how the number of images depends

on the angle between two mirrors

Materialsplane mirrors (2) protractor

masking tape paper clip

Safety Precautions

Handle glass mirrors and paper clips carefully

Procedure1 Complete the safety form

2 Lay one mirror on top of the other with the

mirror surfaces together Tape together one

side so they can open and close Use tape to

label them L and R for left and right

3 Open the mirrors and stand them on a sheet

of paper at an angle of 72deg

4 Bend one leg of a paper clip up 90deg and

place it close to the front of the R mirror

5 Count the number of images of the paper

clip you see in the R and L mirrors Record

these numbers in your data table

6 The mirrors create an image of a circle

divided into wedges Record the number

of wedges

7 Hold the R mirror still and slowly move the Lmirror to 90deg Record the numbers of images

of the clip and wedges in the circle Repeat

this time opening the mirrors to 120deg

Conclude and Apply1 Infer the relationship between the number

of wedges and paper clip images

2 Determine the angle that would divide a

circle into six wedges Hypothesize how

many images would be produced Test your

hypothesis

Reflections of Reflections

Demonstrate for younger students the

relationship between the angle of the

mirrors and the number of reflections

338 CHAPTER 11 Sound and Light

Angle

Number of Number

of Mirrors Paper Clip Images

of Wedges R L

72ordm

90ordm

120ordm

Images and Wedges Seen in the Mirrors

Do not write in this book

SECTION 4 Light and Color 339

Why Objects Have ColorWhy do some apples appear red while others look green or

yellow An objectrsquos color depends on the wavelengths of light itreflects Recall that white light is a blend of all colors of visiblelight When a red apple is struck by white light it reflects redlight back to your eyes and absorbs all of the other colorsFigure 24 shows white light striking a green leaf Only the wave-lengths corresponding to green light are reflected to your eyes

Although some objects appear to be black black isnrsquot acolor Black is the absence of visible light Objects that appearblack absorb all colors of light and reflect little or no light backto your eyes White objects appear to be white because theyreflect all colors of visible light

Why does a white object appear white

Colored Filters Wearing tinted glasses changesthe color of almost everything you see If the lensesare yellow the world takes on a golden glow If theyare rose colored everything looks rosy Somethingsimilar would occur if you placed a colored clearplastic sheet over this white page The paper wouldappear to be the same color as the plastic The plasticsheet and the tinted lenses are filters A filter is atransparent material that transmits one or more col-ors of light but absorbs all others The color of a fil-ter is the color of the light that it transmits

Light and Color

Reading Guide

Explain how you see color Describe the difference between

light color and pigment color Predict what happens when dif-

ferent colors are mixed

From traffic lights to great works of

art color is an important part of your

world

Review Vocabulary

retina inner layer of the eye con-

taining cells that convert light

images into electrical signals

New Vocabulary

bull pigment

Figure 24 This leaf absorbs all

wavelengths of visible light except

the wavelengths you see as green

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340 CHAPTER 11 Sound and Light

Looking Through Colored Filters Figure 25 shows howthe color of an object can change when you look at it throughvarious colored filters The cooler looks blue under white lightbecause it reflects only the wavelengths of blue light that strikeit If you look at the cooler through a blue filter the cooler stilllooks blue because the blue filter transmits the reflected bluelight However if you look at the cooler through a red filter thecooler seems black because the red filter blocks the blue lightreflected by the cooler

Why does a blue object appear black whenviewed through a red filter

Seeing ColorAs you approach a busy intersection the color of the traffic

light changes from green to yellow to red On the cross street thecolor changes from red to green At a busy intersection trafficsafety depends on your ability to detect color changes rapidlyHow do you see colors

Light and the Eye In a healthy eye light enters the eyethrough the cornea is focused by the lens and finally forms animage on the retina The retina is made up of two types of cellsthat absorb light as shown in Figure 26 When these cellsabsorb light energy chemical reactions convert light energy intonerve impulses that are transmitted to the brain One type ofcell in the retina called a cone enables you to distinguish colorsand detailed shapes of objects Cones need bright light to gener-ate nerve impulses so they do not operate in dim light As aresult even brightly colored objects might look gray or black indim light

Figure 25 The color of this

cooler changes when viewed

through different color filters

Topic Color BlindnessVisit for Web

links to information about the

causes of color blindness

Activity Research the causes

and types of color blindness Find

out how cones are related to the

ability to distinguish colors

gpesciencecom

GPS+_340

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SECTION 4 Light and Color 341

Cones and Rods Your eyes have three types of cones each ofwhich responds to a different range of wavelengths Red conesrespond to mostly red and yellow light Green cones respond tomostly yellow and green light Blue cones respond to mostlyblue and violet light The second type of cell in the retina calleda rod is sensitive to dim light and enables you to see at nightHowever rod cells do not enable you to see colors

Interpreting Color Why does a bananalook yellow The light reflected by the

banana causes the cone cells that are sensitive to red and greenlight to send signals to your brain Your brain could get the samesignal if a mixture of red light and green light reached your eyesThis mixture also would cause your red and green cones torespond and you would see the color yellow As a result lightwith wavelengths corresponding to yellow light and light that isa mixture of red and green light both cause the color yellow tobe seen What happens when you look at a white shirt You seewhite when all wavelengths of visible light enters your eyes Thenall three sets of cones cells send signals to the brain The com-bination of these signals cause you to see the shirt as white

Color Blindness If one or more of your sets of cone cellsdo not function properly you might not be able to distinguishcertain colors This condition is called color blindness orcolor deficiency About eight percent of men and one-halfpercent of women have some form of color blindness Themost common form of color blindness makes it difficult todistinguish between red and green Figure 27 shows an imagethat is used in a test for redndashgreen color blindness Becausered and green are used in traffic signals drivers and pedestri-ans must be able to identify them

Retina

Rod

Cone

Lens

Figure 27 Color blindness is an

inherited sex-linked condition in

which certain sets of cones in the

retina do not function properly

Identify the number that you seein the dots

Figure 26 Light enters the eye

and focuses on the retina The two

types of light-detecting cells

that make up the retina

are called rods and cones

GPS+_341

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342 CHAPTER 11 Sound and Light

Mixing ColorsIf you have ever browsed through a paint store you have

probably seen displays where customers can select paint samplesof almost every imaginable color The colors are a result of mix-tures of pigments For example you might have mixed blue andyellow paint to produce green paint A pigment is a coloredmaterial that is used to change the color of other substancesThe color of a pigment results from the different wavelengths oflight that the pigment reflects

Mixing Colored Lights From the glowing orange of a sun-set to the deep blue of a mountain lake all the colors you see canbe made by mixing three colors of light These three colorsmdashred green and bluemdashare the primary colors of light They cor-respond to the three different types of cones in the retina ofyour eye When mixed together in equal amounts they producewhite light as Figure 28 shows Mixing the primary colors indifferent proportions can produce the colors you see

What are the primary colors of light

Paint Pigments If you were to mix equal amounts of redgreen and blue paint would you get white paint If mixing col-ors of paint were like mixing colors of light you would but mix-ing paint is different Paints are made with pigments Pigmentsproduce color as a result of the wavelengths of light they reflectPaint pigments usually are made of chemical compounds suchas titanium oxide a bright white pigment and lead chromatewhich is used for painting yellow lines on highways

Figure 28 White light is pro-

duced when the three primary col-

ors of light are mixed in equal

amounts

Color for PhotosynthesisPlant pigments determinethe wavelengths oflight for photosynthesisLeaves usually look greenbecause of the pigmentchlorophyll Chlorophyllabsorbs most wave-lengths of visible lightexcept green which itreflects However not allplants are green Researchdifferent plant pigmentsto find out how they allowplant species to survive indiverse habitats

GPS+_342

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SECTION 4 Light and Color 343

Self Check

1 Identity what colors are reflected and what colors are

absorbed if a white light shines on a red shirt

2 Discuss how the primary colors of light differ from the

primary pigment colors

3 Explain why a red apple would appear black if you

looked at it through a blue filter

4 Determine why a white fence appears to be white instead

of multicolored if all colors are present in white light

5 Think Critically Light reflected from an object passes

through a green filter then a red filter and finally a

blue filter What color will the object seem to be

Summary

Why Objects Have Color

bull The color of an object is determined by the

wavelengths of light it reflects

bull The color of a filter is the color of the light the

filter transmits

Seeing Color

bull Rod and cone cells are light-sensitive cells

found in the retina of the human eye

bull Rod cells are sensitive to dim light Cone cells

enable colors to be seen

bull There are three types of cone cells One type

responds to red light another to green light

and another to blue light

Mixing Colors

bull Red green and blue are the primary light

colors Any color of light can be created by

mixing these primary light colors

bull Any pigment color can be formed by mixing

the primary pigment colorsmdashmagenta cyan

and yellow

6 Use Percentages In the human eye there are about

120000000 rods If 90000000 rods trigger at once

what percentage of the total number of rods triggered

7 Convert Units The wavelengths of light are measured

in nanometers (nm) which equals 0000001 mm

Find the wavelength in mm of a light wave that has a

wavelength of 690 nm

Mixing Pigments You can make any pigment color by mixingdifferent amounts of the three primary pigmentsmdashmagenta(bluish red) cyan (greenish blue) and yellow In fact color print-ers use these pigments as well as black ink to make full-colorprints like the pages in this book A primary pigmentrsquos colordepends on the wavelengths of the light that it reflects Actuallypigments both absorb and reflect a range of colors in sending asingle color message to your eye For example in white lightyellow pigment appears yellow because it reflects red and greenlight but absorbs the other wavelengths of visible light The colorof a mixture of two primary pigments is determined by theprimary colors of light that both pigments reflect

Look at Figure 29 The area in the center where the colors alloverlap appears to be black because the three blended primarypigments absorb all the primary colors of light Recall that theprimary colors of light combine to produce white light They arecalled additive colors However when the primary pigment col-ors are combined they absorb all wavelengths of visible light andproduce black Because black results from the absence ofreflected light the primary pigments are called subtractive colors

Figure 29 The three primary

pigment colors appear to be black

when they are mixed

Describe how the primary pigmentcolors are similar to the primary col-ors of light

More Section Review gpesciencecom

GPS+_343

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Design Your OwnDesign Your Own

344

Real-World ProblemWhat loud noises do you enjoy and which ones do you find annoying

Most people enjoy a music concert performed by their favorite artist or

the booming displays of fireworks on the Fourth of July Most people

enjoy these loud sounds for short periods of time However certain

other loud noises such as traffic sirens and loud talking can be

annoying Constant annoying noises are called noise pollution What

can be done to reduce noise pollution What types of barriers will best

block out noise pollution

Form a HypothesisBased on your experiences with loud noises form a hypothesis that

predicts the effectiveness of different types of barriers at blocking out

noise pollution

Test Your HypothesisMake a Plan

1 Complete the safety form

2 Decide what type of barriers or materials you will test

3 Describe exactly how you will use these materials

Goals Design an experiment

that tests the effective-

ness of various types of

barriers and materials

for blocking out noise

pollution

Test different types of

materials and barriers

to determine the best

noise blocks

Possible Materialsradio CD player horn

drum or other loud

noise source

shrubs trees concrete

walls brick walls stone

walls wooden fences

parked cars or hanging

laundry

sound meter

meterstick or metric tape

measure

Blocking NfisePollution

4 Identify the controls and variables you will use in your

experiment

5 List the steps you will use and describe each step precisely

6 Prepare a data table in your Science Journal to record your

measurements

7 Organize the steps of your experiment in logical order

Follow Your Plan

1 Ask your teacher to approve your plan and data table before

you start

2 Conduct your experiment as planned

3 Test each barrier two or three times

4 Record the results from each test in your data table in your Science Journal

Analyze Your Data1 Identify the barriers that most effectively reduced noise pollution

2 Identify the barriers that least effectively reduced noise pollution

3 Compare the effective barriers and identify common characteristics that might

explain why they reduced noise pollution

4 Compare the natural barriers you tested with the artificial barriers Which type

of barrier best reduced noise pollution

5 Compare the different types of materials the barriers were made of Which

type of material best reduced noise pollution

Conclude and Apply1 Evaluate whether your results support your hypothesis

2 Predict how your results would differ if you used a louder source of noise such

as a siren

3 Infer from your results how people living near a

busy street could reduce noise pollution

4 Identify major sources of noise pollution in or

near your home How could they be reduced

5 Research how noise pollution can be

unhealthy

LAB 345

Draw a poster illustrating how builders and

landscapers could use certain materials to

better insulate a home or office from excess

noise pollution

346 CHAPTER 11 Sound and Light

A Haiku GardenThe Four Seasons in Poems and Prints

by Stephen Addiss with Fumiko and Akira Yamamoto

Respond to the Reading1 How do the illustrations help the reader

better understand the poems2 What do you think is meant by the

word lingering in the Haiku about springsunlight

3 Linking Science and Writing Writeone haiku about summer and anotherabout fall In one poem use color tohelp you describe the season In theother use light or some property oflight to help describe the season

Research has deter-mined that there is a

connection between color and mood Warmcolors have longer wavelengths and can bemore stimulating Cool colors which haveshorter wavelengths tend to have a calmingor soothing effect on people Light and colorhave long been used as literary symbols Doesthe use of color change what you imaginewhen you read the haiku

UnderstandingLiteratureJapanese Haiku A haiku is a verse thatconsists of three lines and 17 syllables inthe Japanese language The first and thirdlines have five syllables each and themiddle line has seven syllables Why isimagination important in reading haiku

Lingering

in every pool of watermdash

spring sunlightIssa

Withered by winter

the sound of the windmdash

one-color worldBasho

Sound

1 Sound waves are compressional waves thattravel only in matter

2 The speed of sound in a material dependson the type of material as well as itstemperature

3 Loudness depends on a sound waversquos inten-sity Pitch depends on a sound waversquosfrequency

4 Sound waves are used in echolocationsonar and medical imaging

Reflection and Refractionof Light

1 Light can be absorbed reflected or trans-mitted by a material

2 When light waves are reflected theyobey the law of reflectionmdashthe angle ofincidence equals the angle of reflection

3 A light wave is refracted or bent whenit changes speed as it travels at an anglefrom one material to another

Mirrors Lenses andthe Eye

1 Plane mirrors form upright virtual images

2 Images formed by concave mirrors andconvex lenses depend on the location ofthe object relative to the focal point

3 Convex mirrors and concave lenses formvirtual upright images that are smallerthan the object

4 The lens in the human eye changes shape toproduce a sharp image on the retina

Light and Color

1 You see color when light is reflected offobjects and into your eyes

2 Cone cells in the retina are light-sensitivecells that enable you to distinguish colors

3 Red blue and green are the three primarycolors of light and can be mixed to form allother colors

4 The primary pigment colors are magentacyan and yellow

CHAPTER STUDY GUIDE 347

Use the Foldable you made at the beginningof the chapter to help you review sound and light

Interactive Tutor gpesciencecom

Complete each statement with the correctvocabulary word or phrase

1 A change in frequency due to a movingsound source is due to the

2 A flat smooth surface that reflects light andforms an image is a(n)

3 An object is if you can seethrough it clearly

4 The of a material indicates howmuch the speed of light in the materialchanges as light passes through

5 You can change the color of white paint byadding a(n) to it

6 A(n) is a reflecting surface thatcurves outward like the back of a spoon

7 The human perception of the intensity of asound wave is

Choose the word or phrase that best answerseach question

8 Which of the following best describes imageformation by a plane mirrorA) A real image is formed in front of the mirrorB) A real image is formed behind the mirrorC) A virtual image is formed in front of the

mirrorD) A virtual image is formed behind the mirror

9 For a sound with low pitch what else isalso always lowA) amplitude C) wavelengthB) frequency D) wave velocity

10 Which of the following occurs when asound source moves away from youA) The soundrsquos velocity decreasesB) The soundrsquos loudness increasesC) The soundrsquos frequency decreasesD) The soundrsquos frequency increases

Use the table below to answer question 11

11 Based on the data in the table abovewhich of the following would be the speedof sound in air at 30degCA) 3404 ms C) 3494 msB) 3464 ms D) 3534 ms

12 What happens to a light ray travelingparallel to the optical axis of a convexlens that passes through the lensA) It travels parallel to the optical axisB) It passes through the focal pointC) It is bent away from the optical axisD) It forms a virtual image

13 Light waves of which color are bent mostwhen passing through a prismA) blue C) violetB) red D) yellow

14 Which way does a concave lens bend lightA) toward its optical axisB) toward its centerC) toward its edgesD) toward its focal point

Speed of Sound in Air

Temp peed( s)

4

4

4

348 CHAPTER REVIEW

concave lens p 335concave mirror p 332convex lens p 333convex mirror p 333decibel p 322Doppler effect p 323index of refraction p 329intensity p 322

loudness p 322opaque p 327pigment p 342pitch p 323plane mirror p 331translucent p 327transparent p 327

Vocabulary PuzzleMaker gpesciencecom

Use the illustration below to answer question 15

15 Describe how the position of the candlechanged if the image of the candle movedaway from the focal point

16 Apply Acoustic scientists sometimes doresearch in rooms that absorb all soundwaves How could such a room be used tostudy how bats find their food

17 Compare White light passes through atranslucent pane of glass and shines on ashirt Both the translucent glass and theshirt appear green Compare the colors oflight that are absorbed and transmitted bythe glass and the shirt

18 Infer Most mammals including dogs andcats canrsquot see colors Infer how the retinaof a catrsquos eye might be different from theretina of a human eye

19 Determine whether a convex lens could forman image that is enlarged real and upright

20 Infer A car comes to a railroad crossingThe driver hears a trainrsquos whistle and itspitch becomes lower What can beassumed about how the train is moving

21 Compare and contrast the reflection of lightfrom a white wall with a rough surfacewith the reflection of light from a mirror

Optical axis

One

focal

length

Two

focal

lengths

Image

Ray A

Object

Focal

point

Interpreting Graphics 22 Infer why a convex mirror and a concavelens can never produce a real image

23 Predict what color a white shirt wouldappear to be if the light reflected from theshirt passed through a red filter and thenthrough a green filter

24 Explain why windows might begin to rattlewhen an airplane flies overhead

25 Communicate Some people enjoy usingsnowmobiles Others object to the noisethat they make Write a proposal for a pol-icy that seems fair to both groups for theuse of snowmobiles in a state park

CHAPTER REVIEW 349

Use the wave speed equation ν ƒλ to answer

questions 26 and 27

26 Calculate Frequency A sonar pulse has awavelength of 30 cm and a speed inwater of 1500 ms Find its frequency

27 Calculate Wavelength What is the wave-length of a sound wave with a fre-quency of 440 Hz if the speed of soundin air is 340 ms

28 Calculate Angle of Incidence A light ray isreflected from a mirror If the anglebetween the incident ray and thereflected ray is 136deg what is the angleof incidence

29 Determine Object Distance You hold anobject in front of a concave mirror witha focal length of 30 cm If you do notsee a reflected image how far from themirror is the object

30 Calculate Speed The speed of light in avacuum is 300000 kms If the index ofrefraction of water is 133 what is thespeed of light in water

More Chapter Review gpesciencecom

1 Which of the following describes the imageformed by a convex mirror

A enlarged

B inverted

C real

D virtual

Use the figure below to answer question 2

2 Which of the following describes a light raythat passes through the focal point andthen is reflected by the mirror

A It travels parallel to the optical axis

B It forms a real image

C It is reflected back through the focal point

D It forms a virtual image

3 Why does an apple look red

A It reflects red light

B It absorbs red light

C It reflects green and blue light

D It reflects all colors of light except red

Use the figure below to answer questions 4 and 5

4 When the primary colors of light are addedtogether what color appears in area H

A cyan

B magenta

C white

D yellow

5 When the primary colors of light are addedtogether what color appears in area G

A cyan

B magenta

C white

D yellow

6 Which of the following increases as the fre-quency of a sound increases

A amplitude

B intensity

C loudness

D pitch

Red Blue

Green

F

H

G K

Focal pointOptical axis

350 STANDARDIZED TEST PRACTICE

Record your answers on the answer sheet provided by your teacher or on a sheet of paper

STANDARDIZED TEST PRACTICE 351

7 Which of the following parts of the eyeenable you to see colors in bright light

A cone cells

B cornea

C lens

D rod cells

Use the graph below to answer questions 8 and 9

8 Determine how far in centimeters theimage is from the lens when the object is15 centimeters from the lens

9 How far in centimeters is the object fromthe lens when the image distance andobject distance are equal

10 A shirt has stripes that are black and whitein white light If green light shines on thisshirt what colors will the black and whitestripes be

11 If you are on a moving train what hap-pens to the pitch of a crossing bell as youapproach the crossing and then moveaway from the crossing

Use the figure below to answer question 12

12 Describe the vision problem show by thefigure and explain how this vision prob-lem can be corrected

13 Explain why the human eye can see colorsbetter in bright light than in dim light

Image Distance fora Convex Lens

Ima

ge

dis

tan

ce (

cm)

30

25

20

15

10

5 10 15 20 25 30

Object distance (cm)

Standardized Test Practice gpesciencecom

Note Units Read carefully and make note of the units used in

any measurement

  • Glencoe Physical Science with Earth Science
    • Student Edition Table of Contents
      • Unit 1 Science and Technology
        • Chapter 1 The Nature of Science
          • Launch Lab Understanding Measurements
          • Foldables
          • Section 1 The Methods of Science
            • Science Online
            • Integrate History
            • Integrate Earth Science
            • Science Online
              • Section 2 Standards of Measurement
                • Applying Math Centimeters
                • Integrate Earth Science
                • Science Online
                • MiniLAB Determining the Density of a Pencil
                • Visualizing SI Dimensions
                  • Section 3 Communicating with Graphs
                    • Applying Math Temperature
                    • MiniLAB Graphing Temperature Change
                    • Lab Whats my graph
                    • Lab Design Your Own - Developing a Measurement System
                    • Science and Language Arts Thinking in Pictures and Other Reports from My Life with Autism
                      • Chapter 1 Study Guide
                      • Chapter 1 Review
                      • Chapter 1 Standardized Test Practice
                        • Chapter 2 Science Technology and Society
                          • Lab Technology in Your Life
                          • Foldables
                          • Section 1 Science and Technology
                            • MiniLAB Researching the Past
                            • Visualizing Technology Supplying Basic Needs
                            • Science Online
                              • Section 2 Forces that Shape Technology
                                • MiniLAB Evaluating the Benefits and Consequences of Technology
                                • Integrate Environment
                                • Integrate History
                                • Applying Science What impact does the accident at Chernobyl have on the future of nuclear power
                                • Science Online
                                • Lab Who contributes CO2
                                  • Section 3 Developing Technology
                                    • Integrate Life Science
                                    • Integrate Career
                                    • Lab Model and Invent - Care Package
                                    • Oops Accidents in Science A Slippery Situation
                                      • Chapter 2 Study Guide
                                      • Chapter 2 Review
                                      • Chapter 2 Standardized Test Practice
                                          • Unit 2 Motion Forces and Energy
                                            • Chapter 3 Motion Acceleration and Forces
                                              • Launch Lab Compare Speeds
                                              • Foldables
                                              • Section 1 Describing Motion
                                                • MiniLAB Measuring Average Speed
                                                • Science Online
                                                • Applying Math Average Speed
                                                • Integrate Astronomy
                                                • Science Online
                                                  • Section 2 Acceleration
                                                    • Integrate History
                                                    • Visualizing Acceleration
                                                      • Section 3 Motion and Forces
                                                        • Science Online
                                                        • MiniLAB Comparing Friction
                                                        • Lab Force and Acceleration
                                                        • Lab Design Your Own - Comparing Motion from Different Forces
                                                        • Science and Language Arts A Brave and Startling Truth
                                                          • Chapter 3 Study Guide
                                                          • Chapter 3 Review
                                                          • Chapter 3 Standardized Test Practice
                                                            • Chapter 4 The Laws of Motion
                                                              • Launch Lab The Force of Gravity
                                                              • Foldables
                                                              • Section 1 The First Two Laws of Motion
                                                                • MiniLAB Observing Inertia
                                                                • Science Online
                                                                • Applying Math The Acceleration of a Sled Solve a Simple Equation
                                                                  • Section 2 Gravity
                                                                    • Science Online
                                                                    • Integrate Earth Science
                                                                    • MiniLAB Observing Centripetal Force
                                                                    • Lab Gravity and Air Resistance
                                                                      • Section 3 The Third Law of Motion
                                                                        • Integrate Career
                                                                        • Visualizing Rocket Motion
                                                                        • Applying Math The Momentum of a Sprinter
                                                                        • Lab The Momentum of Colliding Objects
                                                                        • Science and History Newton and the Plague
                                                                          • Chapter 4 Study Guide
                                                                          • Chapter 4 Review
                                                                          • Chapter 4 Standardized Test Practice
                                                                            • Chapter 5 Energy
                                                                              • Launch Lab Energy Conversions
                                                                              • Foldables
                                                                              • Section 1 The Nature of Energy
                                                                                • Science Online
                                                                                • Applying Math Kinetic Energy
                                                                                • MiniLAB Interpreting Data from a Slingshot
                                                                                • Integrate Language Arts
                                                                                • Applying Math Gravitational Potential Energy
                                                                                • Lab Bouncing Balls
                                                                                  • Section 2 Conservation of Energy
                                                                                    • Visualizing Energy Transformations
                                                                                    • Integrate Environment
                                                                                    • MiniLAB Transforming Energy in a Paper Clip
                                                                                    • Science Online
                                                                                    • Integrate Health
                                                                                    • Lab Design Your Own - Swinging Energy
                                                                                    • Science and History The Impossible Dream
                                                                                      • Chapter 5 Study Guide
                                                                                      • Chapter 5 Review
                                                                                      • Chapter 5 Standardized Test Practice
                                                                                        • Chapter 6 Work and Machines
                                                                                          • Launch Lab Doing Work with a Simple Machine
                                                                                          • Foldables
                                                                                          • Section 1 Work
                                                                                            • Integrate Language Arts
                                                                                            • Applying Math Work
                                                                                            • MiniLAB Calculating Your Work and Power
                                                                                            • Applying Math Power
                                                                                              • Section 2 Using Machines
                                                                                                • MiniLAB Machines Multiplying Force
                                                                                                • Science Online
                                                                                                • Integrate Chemistry
                                                                                                  • Section 3 Simple Machines
                                                                                                    • Integrate History
                                                                                                    • Visualizing Levers in the Human Body
                                                                                                    • Science Online
                                                                                                    • Lab Levers
                                                                                                    • Lab Model and Invent - Using Simple Machines
                                                                                                    • Science and Society The Science of Very Very Small
                                                                                                      • Chapter 6 Study Guide
                                                                                                      • Chapter 6 Review
                                                                                                      • Chapter 6 Standardized Test Practice
                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                          • Launch Lab Relative Sizes of Earth the Moon and the Sun
                                                                                                          • Foldables
                                                                                                          • Section 1 Earth in Space
                                                                                                            • Science Online
                                                                                                            • Integrate Physics
                                                                                                              • Section 2 Time and Seasons
                                                                                                                • MiniLAB Modeling the Suns Rays at Solstice
                                                                                                                • Lab Comparing the Angle of Sunlight to Intensity
                                                                                                                  • Section 3 Earths Moon
                                                                                                                    • Applying Math Tides
                                                                                                                    • MiniLAB Modeling Phases and Eclipses
                                                                                                                    • Integrate History
                                                                                                                    • Integrate History
                                                                                                                    • Science Online
                                                                                                                    • Visualizing Water on the Moon
                                                                                                                    • Lab Identifying the Moons Surface Features and Apollo Landing Sites
                                                                                                                    • Oops Accidents in Science Even Great Scientists Make Mistakes
                                                                                                                      • Chapter 7 Study Guide
                                                                                                                      • Chapter 7 Review
                                                                                                                      • Chapter 7 Standardized Test Practice
                                                                                                                        • Chapter 8 The Solar System
                                                                                                                          • Launch Lab The Size of the Solar System
                                                                                                                          • Foldables
                                                                                                                          • Section 1 Planet Motion
                                                                                                                            • Integrate History
                                                                                                                            • MiniLAB Plotting Retrograde Motion
                                                                                                                            • Integrate Physics
                                                                                                                            • Applying Math Heliocentric Longitude (HL)
                                                                                                                              • Section 2 The Inner Planets
                                                                                                                                • Science Online
                                                                                                                                • Integrate Chemistry
                                                                                                                                • Lab Interpreting Features of Marss Surface
                                                                                                                                  • Section 3 The Outer Planets
                                                                                                                                    • Integrate Language Arts
                                                                                                                                    • Visualizing What Galileo Saw
                                                                                                                                    • Science Online
                                                                                                                                    • MiniLAB Comparing Sizes of Outer and Inner Planets
                                                                                                                                      • Section 4 Life in the Solar System
                                                                                                                                        • Lab Design Your Own - Testing Unknown Soil Samples for Life
                                                                                                                                        • Science Stats Night Sky Wonders
                                                                                                                                          • Chapter 8 Study Guide
                                                                                                                                          • Chapter 8 Review
                                                                                                                                          • Chapter 8 Standardized Test Practice
                                                                                                                                              • Unit 3 Energy in Motion
                                                                                                                                                • Chapter 9 Heat and States of Matter
                                                                                                                                                  • Launch Lab Expansion of a Gas
                                                                                                                                                  • Foldables
                                                                                                                                                  • Section 1 Temperature and Thermal Energy
                                                                                                                                                    • Applying Math Converting to Celsius
                                                                                                                                                    • Science Online
                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                    • Applying Math Change in Thermal Energy
                                                                                                                                                      • Section 2 States of Matter
                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                        • Science Online
                                                                                                                                                        • MiniLAB Comparing States of Water
                                                                                                                                                          • Section 3 Transferring Thermal Energy
                                                                                                                                                            • MiniLAB Comparing Thermal Conductors
                                                                                                                                                            • Visualizing Convection Currents
                                                                                                                                                            • Lab Convection in Gases and Liquids
                                                                                                                                                              • Section 4 Using Thermal Energy
                                                                                                                                                                • Integrate History
                                                                                                                                                                • Science Online
                                                                                                                                                                • Lab Conduction in Gases
                                                                                                                                                                • Science Stats Surprising Thermal Energy
                                                                                                                                                                  • Chapter 9 Study Guide
                                                                                                                                                                  • Chapter 9 Review
                                                                                                                                                                  • Chapter 9 Standardized Test Practice
                                                                                                                                                                    • Chapter 10 Waves
                                                                                                                                                                      • Launch Lab How do waves transfer energy
                                                                                                                                                                      • Foldables
                                                                                                                                                                      • Section 1 The Nature of Waves
                                                                                                                                                                        • Visualizing Formation of Ocean Waves
                                                                                                                                                                        • Science Online
                                                                                                                                                                          • Section 2 Wave Properties
                                                                                                                                                                            • MiniLAB Observing Wavelength
                                                                                                                                                                            • Integrate Social Studies
                                                                                                                                                                            • Applying Math The Speed of Sound
                                                                                                                                                                            • Lab Wave Speed and Tension
                                                                                                                                                                              • Section 3 The Behavior of Waves
                                                                                                                                                                                • Science Online
                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                • MiniLAB Experimenting with Resonance
                                                                                                                                                                                • Lab Measuring Wave Properties
                                                                                                                                                                                • Science and History Making Waves
                                                                                                                                                                                  • Chapter 10 Study Guide
                                                                                                                                                                                  • Chapter 10 Review
                                                                                                                                                                                  • Chapter 10 Standardized Test Practice
                                                                                                                                                                                    • Chapter 11 Sound and Light
                                                                                                                                                                                      • Launch Lab What sound does a ruler make
                                                                                                                                                                                      • Foldables
                                                                                                                                                                                      • Section 1 Sound
                                                                                                                                                                                        • MiniLAB Comparing Intensity
                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                        • Science Online
                                                                                                                                                                                        • Applying Math Using Sonar
                                                                                                                                                                                          • Section 2 Reflection and Refraction of Light
                                                                                                                                                                                          • Section 3 Mirrors Lenses and the Eye
                                                                                                                                                                                            • Visualizing Images Formed by a Convex Lens
                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                            • MiniLAB Experimenting with Focal Lengths
                                                                                                                                                                                            • Lab Reflections of Reflections
                                                                                                                                                                                              • Section 4 Light and Color
                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Lab Design Your Own - Blocking Noise Pollution
                                                                                                                                                                                                • Science and Language Arts A Haiku Garden The Four Seasons in Poems and Print
                                                                                                                                                                                                  • Chapter 11 Study Guide
                                                                                                                                                                                                  • Chapter 11 Review
                                                                                                                                                                                                  • Chapter 11 Standardized Test Practice
                                                                                                                                                                                                    • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                      • Launch Lab Global Jigsaw Puzzle
                                                                                                                                                                                                      • Foldables
                                                                                                                                                                                                      • Section 1 Evolution of Earths Crust
                                                                                                                                                                                                        • Applying Math Spreading Distances
                                                                                                                                                                                                        • Integrate Physics
                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                          • Section 2 Earthquakes
                                                                                                                                                                                                            • MiniLAB Demonstrating Four Types of Stress
                                                                                                                                                                                                            • Visualizing Earthquake-Proof Buildings
                                                                                                                                                                                                              • Section 3 Earths Interior
                                                                                                                                                                                                              • Section 4 Volcanoes
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • MiniLAB Modeling Lava Viscosity
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                • Lab A Case for Pacific Plate Motion
                                                                                                                                                                                                                • Lab Earthquake Earthquake Wheres the earthquake
                                                                                                                                                                                                                • Science and History Volcano Weather
                                                                                                                                                                                                                  • Chapter 12 Study Guide
                                                                                                                                                                                                                  • Chapter 12 Review
                                                                                                                                                                                                                  • Chapter 12 Standardized Test Practice
                                                                                                                                                                                                                      • Unit 4 Forms of Energy
                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                          • Launch Lab Electric Circuits
                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                          • Section 1 Electric Charge
                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                            • Visualizing Lightning
                                                                                                                                                                                                                            • MiniLAB Investigate Charged Objects
                                                                                                                                                                                                                              • Section 2 Electric Current
                                                                                                                                                                                                                                • MiniLAB Investigating Battery Addition
                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                • Lab Identifying Conductors and Insulators
                                                                                                                                                                                                                                  • Section 3 Electrical Energy
                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                    • Applying Math Power Used by a Clothes Dryer
                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                    • Applying Math Electrical Energy Used by a Microwave Oven
                                                                                                                                                                                                                                    • Lab Design Your Own - Comparing Series and Parallel Circuits
                                                                                                                                                                                                                                    • Science and Language Arts Invisible Man
                                                                                                                                                                                                                                      • Chapter 13 Study Guide
                                                                                                                                                                                                                                      • Chapter 13 Review
                                                                                                                                                                                                                                      • Chapter 13 Standardized Test Practice
                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                          • Launch Lab The Strength of Magnets
                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                          • Section 1 Magnetism
                                                                                                                                                                                                                                            • MiniLAB Observing Magnetic Interference
                                                                                                                                                                                                                                            • Integrate Earth Science
                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                            • Applying Science How can magnetic parts of a junk car be salvaged
                                                                                                                                                                                                                                            • MiniLAB Making Your Own Compass
                                                                                                                                                                                                                                              • Section 2 Electricity and Magnetism
                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                  • Section 3 Producing Electric Current
                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                    • Visualizing Motors and Generators
                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                    • Lab Electricity and Magnetism
                                                                                                                                                                                                                                                    • Lab Design Your Own - Controlling Electromagnets
                                                                                                                                                                                                                                                    • Science and History Body Art
                                                                                                                                                                                                                                                      • Chapter 14 Study Guide
                                                                                                                                                                                                                                                      • Chapter 14 Review
                                                                                                                                                                                                                                                      • Chapter 14 Standardized Test Practice
                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                          • Launch Lab Can electromagnetic waves change materials
                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                          • Section 1 What are electromagnetic waves
                                                                                                                                                                                                                                                            • MiniLAB Investigating Electromagnetic Waves
                                                                                                                                                                                                                                                            • Applying Math The Speed of Light in Water
                                                                                                                                                                                                                                                              • Section 2 The Electromagnetic Spectrum
                                                                                                                                                                                                                                                                • MiniLAB Heating with Microwaves
                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                • Lab The Shape of Satellite Dishes
                                                                                                                                                                                                                                                                  • Section 3 Radio Communication
                                                                                                                                                                                                                                                                    • Visualizing Radio Broadcasts
                                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Lab Use the Internet - Radio Frequencies
                                                                                                                                                                                                                                                                    • Science and History Riding a Beam of Light
                                                                                                                                                                                                                                                                      • Chapter 15 Study Guide
                                                                                                                                                                                                                                                                      • Chapter 15 Review
                                                                                                                                                                                                                                                                      • Chapter 15 Standardized Test Practice
                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                          • Launch Lab Heating with Solar Energy
                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                          • Section 1 Fossil Fuels
                                                                                                                                                                                                                                                                            • Visualizing The Formation of Fossil Fuels
                                                                                                                                                                                                                                                                            • MiniLAB Designing an Efficient Water Heater
                                                                                                                                                                                                                                                                              • Section 2 Nuclear Energy
                                                                                                                                                                                                                                                                                • Integrate Earth Science
                                                                                                                                                                                                                                                                                • Integrate Social Science
                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                • Applying Science Can a contaminated radioactive site be reclaimed
                                                                                                                                                                                                                                                                                  • Section 3 Renewable Energy Sources
                                                                                                                                                                                                                                                                                    • MiniLAB Using Solar Power at Home
                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                    • Lab Solar Heating
                                                                                                                                                                                                                                                                                    • Lab Use the Internet How much does energy really cost
                                                                                                                                                                                                                                                                                    • Science and Society Reacting to Nuclear Energy
                                                                                                                                                                                                                                                                                      • Chapter 16 Study Guide
                                                                                                                                                                                                                                                                                      • Chapter 16 Review
                                                                                                                                                                                                                                                                                      • Chapter 16 Standardized Test Practice
                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                          • Lab Atmospheric Pressure
                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                          • Section 1 Earths Atmosphere
                                                                                                                                                                                                                                                                                            • MiniLAB Visualizing Convection
                                                                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                                                                            • Lab Visualizing a Temperature Inversion
                                                                                                                                                                                                                                                                                              • Section 2 Weather
                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Coriolis Effect
                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                  • Section 3 Climate
                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                    • Visualizing Earths Biogeophysical System
                                                                                                                                                                                                                                                                                                      • Section 4 Earths Changing Climates
                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                        • Applying Math Carbon Dioxide (CO2) Concentration
                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Investigating Microclimate
                                                                                                                                                                                                                                                                                                        • Science and Language Arts The Grapes of Wrath
                                                                                                                                                                                                                                                                                                          • Chapter 17 Study Guide
                                                                                                                                                                                                                                                                                                          • Chapter 17 Review
                                                                                                                                                                                                                                                                                                          • Chapter 17 Standardized Test Practice
                                                                                                                                                                                                                                                                                                              • Unit 5 Matter and Earth Materials
                                                                                                                                                                                                                                                                                                                • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                  • Launch Lab Demonstrate the Distillation of Water
                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                  • Section 1 Composition of Matter
                                                                                                                                                                                                                                                                                                                    • Visualizing Elements
                                                                                                                                                                                                                                                                                                                    • MiniLAB Classifying Materials
                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                    • Lab Comparing Pure Substances and Mixtures
                                                                                                                                                                                                                                                                                                                      • Section 2 Properties of Matter
                                                                                                                                                                                                                                                                                                                        • Integrate Environment
                                                                                                                                                                                                                                                                                                                        • MiniLAB Separating Ink
                                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                                        • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                        • Applying Math The Law of Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Measuring the Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Science Stats Intriguing Elements
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Study Guide
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Review
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                            • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                              • Launch Lab Inferring What You Cant Observe
                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                              • Section 1 Structure of the Atom
                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling an Aluminum Atom
                                                                                                                                                                                                                                                                                                                                • Visualizing The Atomic Model
                                                                                                                                                                                                                                                                                                                                  • Section 2 Masses of Atoms
                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                    • Applying Science How can radioactive isotopes help tell time
                                                                                                                                                                                                                                                                                                                                      • Section 3 The Periodic Table
                                                                                                                                                                                                                                                                                                                                        • MiniLAB Organizing a Personal Periodic Table
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Career
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                                                                                                                                                                        • Lab A Periodic Table of Foods
                                                                                                                                                                                                                                                                                                                                        • Lab Use the Internet Whats in a name
                                                                                                                                                                                                                                                                                                                                        • Science and History A Chilling Story
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Study Guide
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Review
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                            • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                              • Launch Lab Earth Materials at Home and School
                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                              • Section 1 Minerals
                                                                                                                                                                                                                                                                                                                                                • MiniLAB Identifying Salts Crystal System
                                                                                                                                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                • Lab Be a Mineral Detective
                                                                                                                                                                                                                                                                                                                                                  • Section 2 Igneous Rocks
                                                                                                                                                                                                                                                                                                                                                    • Applying Math Extrusive Igneous Rock Classification
                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                      • Section 3 Sedimentary Rocks
                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Evaporites
                                                                                                                                                                                                                                                                                                                                                          • Section 4 Metamorphic Rocks and the Rock Cycle
                                                                                                                                                                                                                                                                                                                                                            • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                            • Visualizing Shock Metamorphic Rock
                                                                                                                                                                                                                                                                                                                                                            • Lab Identifying Rocks
                                                                                                                                                                                                                                                                                                                                                            • Science and Society Earth Materials at Work
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Study Guide
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Review
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                  • Launch Lab Have you got the time
                                                                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                                                                  • Section 1 Weathering and Soil
                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing a Disappearing Seasoning
                                                                                                                                                                                                                                                                                                                                                                    • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                    • Lab Graphing Soil Textures
                                                                                                                                                                                                                                                                                                                                                                      • Section 2 Shaping the Landscape
                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Runoff
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                          • Section 3 Groundwater
                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Porosity Volume
                                                                                                                                                                                                                                                                                                                                                                            • Visualizing The Role of Groundwater in Shaping Earths Surface
                                                                                                                                                                                                                                                                                                                                                                            • Integrate Environment
                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                              • Section 4 Geologic Time
                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                                                                                                • Lab Its about time - relative that is
                                                                                                                                                                                                                                                                                                                                                                                • Science and Society Tapping into the Underground
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Review
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                      • Unit 6 Interactions of Matter
                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                          • Lab Chemical Bonds and Mixing
                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Stability in Bonding
                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                            • Lab Atomic Trading Cards
                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Types of Bonds
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Observing a Bond Type
                                                                                                                                                                                                                                                                                                                                                                                                • Visualizing Polar Molecules
                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Writing Formulas and Naming Compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math Determining a Formula
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Science Can you name binary ionic compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Making a Hydrate
                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Model and Invent - Modeling Chemical Bonding
                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Sticky Subject
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Review
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab RustingmdashA Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Chemical Changes
                                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Designing a Team Equation
                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Chemical Equations
                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math Barium Sulfate Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Classifying Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 4 Reaction Rates and Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing Chemical Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Creating a Colorful Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab To Glow or Not to Glow
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Investigating Reaction Conditions
                                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Clumsy Move Pays Off
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Review
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab Magic Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 How Solutions Form
                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                                                                                                                                                                                                                                                            • Visualizing Metal Alloys
                                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Observing the Effect of Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Solubility and Concentration
                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Acids Bases and Salts
                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing Acid Relief
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Strength of Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Determining Acidity
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Saturated Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and Society Acid Rain
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab The Size of a Nucleus
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Strong Force
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Nuclear Decay
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Detecting Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math The Age of Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Social Studies
                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Nuclear Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling a Nuclear Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
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                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Chain Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Model and Invent Modeling Transmutations
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and History The Nuclear Alchemist
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                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 26 Stars and Galaxies
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                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Observing the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling a Telescope
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 3 Galaxies and the Milky Way
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Science and Language Arts Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Standardized Test Practice
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 4 The Laws of Motion
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 5 Energy
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 6 Work and Machines
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 8 The Solar System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 9 Heat and States of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 10 Waves
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 11 Sound and Light
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 14 Magnetism
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 18 Classification of Matter
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Page 15: 706 S1 318-326 GPS09 - Light-and-Sound - home · PDF fileWhat sound does a ruler make? ... sound waves cannot travel in empty space where there are no particles. ... sound travels

332 CHAPTER 11 Sound and Light

Virtual and Real Images The forma-tion of an image by a plane mirror isshown in Figure 15 Your brain assumesthat light rays travel in a straight line As aresult rays that enter your eyes seem tocome from behind the mirror This makesthe image seem to be behind the mirrorHowever no light rays actually passthrough the place where the image seemsto be located This type of image is called avirtual image Plane mirrors always formvirtual images If light rays from an objectpass through the location of the image theimage is called a real image Curved mir-rors can form both real and virtual images

Concave Mirrors If the surface of a mirror is curved inwardit is called a concave mirror as shown in Figure 16 The opticalaxis is an imaginary straight line drawn perpendicular to thesurface of the mirror at its center Every light ray traveling par-allel to the optical axis is reflected through a point on the opti-cal axis called the focal point The distance from the center ofthe mirror to the focal point is called the focal length

The image formed by a concave mirror depends on the loca-tion of the object relative to the focal point Figure 16 shows acandle located more than twice the focal length from the mirrorAlthough many light rays come from each point on the candleonly two rays from the same point are shown Ray A passesthrough the focal point and then reflects off the mirror movingparallel to the optical axis Ray B travels parallel to the opticalaxis before reflecting off the mirror and passing through thefocal point The point where the two rays meet is the location ofthe image of the original point on the candle The image formedis a real image because light rays from the candle pass throughthe place where the image is located

Figure 16 Rays A and B start from the same

place on the candle travel in different directions

and meet again on the reflected image

Diagram how two other points on the image ofthe candle are formed

Figure 15 Your brain interprets

the light rays reflected by the

mirror as coming from a point

behind the mirror

Infer how the size of your imagein a plane mirror depends on yourdistance from the mirror

Focalpoint

Optical axis

Ray B

Ray A

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SECTION 3 Mirrors Lenses and the Eye 333

Images Produced by a ConcaveMirror When an object is between oneand two focal lengths from a concavemirror the image is real inverted andlarger than the object An object closerthan one focal length from a concavemirror produces a virtual image that isupright and larger than the object Noimage is produced if the object islocated at the focal point

Convex Mirrors When you are in astore look up toward one of the backcorners or at the end of an aisle to see ifa large rounded mirror is mountedthere You can see a large area of the store in such a mirror Amirror that curves outward like the back of a spoon is called aconvex mirror Light rays that hit a convex mirror diverge orspread apart after they are reflected Figure 17 shows how therays from an object are reflected by a convex mirror to form animage The reflected rays diverge and never meet so a convexmirror forms only a virtual image The image also is upright andsmaller than the actual object is

Describe the image formed by a convex mirror

LensesWhat do your eyes have in common with cameras eyeglasses

and microscopes Each of these contains at least one lens A lens is atransparent object with at least one curved surface that causes lightrays to refract The image that a lens forms depends on the shape ofthe lens Like curved mirrors lenses can be convex or concave

Convex Lenses A convex lens is thicker in the middle than atthe edges Its optical axis is an imaginary straight line that is per-pendicular to the surface of the lens at its thickest point When lightrays approach a convex lens traveling parallel to its opticalaxis the rays are refracted toward the center of the lens asin Figure 18 Light rays traveling along the optical axis arenot bent at all All light rays traveling parallel to the opti-cal axis are refracted so they pass through a single pointwhich is the focal point of the lens The less curved thesides of the lens the less light rays are bent As a resultlenses with flatter sides have longer focal lengths Figure 19

on the next page shows that convex lenses can form eitherreal or virtual images

Figure 18 Convex lenses are

thicker in the middle than at the

edges Light rays that are parallel

to the optical axis are refracted so

that they pass through the focal

point A light ray that passes

through the center of the lens is

not refracted

Figure 17 A convex mirror

forms a reduced upright virtual

image

Optical axis

Ray A

Ray B

Focallength

Focalpoint

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Figure 19

VISUALIZING IMAGES FORMED BY A CONVEX LENS

334 CHAPTER 11 Sound and Light

Aconvex lens can form images that are real or virtual enlarged or reduced and upright orinverted Just as for a concave mirror the type of image formed by a convex lens depends on thelocation of the object relative to the focal point of the lens

Optical axis

One

focal

length

Two

focal

lengthsRay B

Image

Ray A

Object

Focal

point

Optical axis

One

focal

length

Two

focal

lengths

Ray B

Ray AObject

Image

Focal

point

Optical axis

Ray B

ObjectRay A

One

focal

length

Focal

pointImage

If the object is more than two focal lengths from the lens the image formed is real inverted andsmaller than the object As the object moves farther from the lens the image becomes smaller

If the object is between one and two focal lengths from the lens the image formed is real invertedand larger than the object As the object moves closer to the focal point the image becomes larger

If the object is less than one focal length from the lens the image is virtual upright and larger thanthe object The image is virtual because the light rays from the object diverge after they pass throughthe lens The image becomes smaller as the object moves closer to the lens

SECTION 3 Mirrors Lenses and the Eye 335

Concave Lenses A concave lens is thinnerin the middle and thicker at the edges Asshown in Figure 20 light rays that passthrough a concave lens bend away from theoptical axis The rays spread out and nevermeet so a real image is never formed Theimage is always virtual upright and smallerthan the object is Concave lenses are used insome types of eyeglasses and some telescopesConcave lenses usually are used in combinationwith other lenses

What type of image is formed by a concave lens

The Human EyeWhat determines how well you can see the words on this

page If you donrsquot need eyeglasses the structure of your eye givesyou the ability to focus on these words and other objects aroundyou Look at Figure 21 Light enters your eye through a trans-parent covering on your eyeball called the cornea The corneacauses light rays to bend so that they converge The light thenpasses through an opening called the pupil Behind the pupil isa flexible convex lens Muscles attached to the lens change itsshape to help focus light forming a sharp image on your retina

The retina is the inner lining of your eye The retina con-tains light-sensitive cells that convert an image into electricalsignals These signals then are carried along the optic nerve toyour brain to be interpreted With this complex structurethe human eye is capable of seeing clearly in bright and dimconditions focusing on both near and far objects and alsodetecting colors

Figure 20 A concave lens

refracts light rays so they spread

out away from the optical axis

Classify Is a concave lens mostlike a concave mirror or a convexmirror

Optical axis

Retina

Focalpoint

Pupil

Cornea

Lens

Optic nerve

Figure 21 The cornea and lens in your eye

bend light rays so that a sharp image is

formed on the retina

Eye Doctors Optometristsand ophthalmologists treatmany different eye prob-lems They often useadvanced technology todiagnose and correct mal-functioning parts of theeye Research an eye prob-lem and how it is treatedWrite a paragraph describ-ing what parts of the eyeare affected by the problemand how doctors correct it

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336 CHAPTER 11 Sound and Light

Brightness and Intensity The human eye can adjust to thebrightness of the light that strikes it If you step outside on asunny day you may have to shade your eyes against the intensityof the sunlight Light intensity is the amount of light energy thatstrikes a certain area each second Brightness is the human per-ception of light intensity Sunlight seems bright because a largeamount of light energy strikes your retina each second Youreyes respond to bright light by decreasing the size of your pupilThis reduces the amount of light that enters your eye and strikesthe retina

Intensity depends on your distance from a light source Ifyou move away from a bare lightbulb you can see how theintensity of the light rapidly decreases Because light rays spreadout from the source less light energy strikes your retina thefarther away you are from the bulb

Correcting Vision ProblemsIf you have good vision you should be able to see objects

clearly when they are 25 cm or farther away from your eyes Asharp image of an object should be formed on your retinaHowever for many people the image is blurry or formed in thewrong place causing vision problems

Farsightedness If you can see distant objects clearly butcanrsquot bring nearby objects into focus then you are farsighted Inthis case the eyeball might be too short or the lens isnrsquot curvedenough to form a sharp image of nearby objects on the retinaas shown in Figure 22 To correct the problem convex lensescan be used to bend incoming light rays so they converge beforethey enter the eye

Experimenting withFocal LengthsProcedure1 Complete the safety form

2 Fill a glass test tube with

water and seal it with a

lid or stopper3 Type or print SULFUR

DIOXIDE in capital letters

on a piece of paper4 Set the test tube horizon-

tally over the words

Record your observations

5 Hold the tube at several

heights above the words

Record your observations

Analysis1 Describe how the words

changed as the height of

the test tube increased

2 Classify the image at each

height as real or virtual

Focal

point

Correctedfarsighted eye

Light fromnearby object

Focalpoint

Light fromnearby object

Farsighted eye

The focal length of a farsighted eye is too long to form

a sharp image of nearby objects on the retina

A convex lens in front of a farsighted eye enables a sharp

image of nearby objects to be formed on the retina

Figure 22 Farsightedness can

be corrected by convex lenses

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SECTION 3 Mirrors Lenses and the Eye 337

Self Check

1 Diagram how light rays from an object are reflected by

a convex mirror to form an image

2 Infer how the size of the image changes if an object

that is less than one focal length from a concave mirror

moves closer to the mirror

3 Explain how the focal length of a convex lens changes

as the sides of the lens become less curved

4 Compare the image of an object less than one focal

length from a convex lens with the image of an object

more than two focal lengths from the lens

5 Think Critically Describe the image formed by a light

source placed at the focal point of a convex lens

Summary

Mirrors

bull A plane mirror forms upright virtual images

bull The image formed by a concave mirror

depends on the location of the object relative

to the focal point

bull Convex mirrors always produce virtual upright

images that are smaller than the object

Lenses

bull The image formed by a convex lens depends

on the distance of the object from the lens

bull Concave lenses always form virtual upright

images that are smaller than the object

The Eye and Vision

bull The eye contains a lens that changes shape to

produce sharp images on the retina

bull Farsightedness occurs when the eye cannot

form a sharp image of nearby objects

Nearsightedness occurs when the eye cannot

form sharp images of distant objects

6 Calculate Object Distance If you looked through a

convex lens with a focal length of 15 cm and saw a

real inverted enlarged image what is the maximum

distance between the lens and the object

Nearsightedness If you have nearsighted friends you knowthat they can see only nearby objects clearly Their eyes cannotform a sharp image on the retina of an object that is far awayInstead the image is formed in front of the retina as shown inFigure 23 To correct this problem a nearsighted person canwear concave lenses Figure 23 shows how a concave lens causesincoming light rays from distant objects to diverge before theyreach the eye Then the rays can be focused by the eye to form asharp image on the retina

Figure 23 Nearsightedness can

be corrected with concave lenses

Focalpoint

Light fromdistant object

Nearsighted eye

Focalpoint

Light fromdistant object

Correctednearsighted eye

When a nearsighted person looks at distant objects a

sharp image is formed in front of the retina

A concave lens in front of a nearsighted eye makes light

rays diverge so a sharp image is formed on the retina

More Section Review gpesciencecom

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How can you see the back of your head You

can use two mirrors to view a reflection of a

reflection of the back of your head

Real-World ProblemHow many images are seen in two mirrors

Goal Infer how the number of images depends

on the angle between two mirrors

Materialsplane mirrors (2) protractor

masking tape paper clip

Safety Precautions

Handle glass mirrors and paper clips carefully

Procedure1 Complete the safety form

2 Lay one mirror on top of the other with the

mirror surfaces together Tape together one

side so they can open and close Use tape to

label them L and R for left and right

3 Open the mirrors and stand them on a sheet

of paper at an angle of 72deg

4 Bend one leg of a paper clip up 90deg and

place it close to the front of the R mirror

5 Count the number of images of the paper

clip you see in the R and L mirrors Record

these numbers in your data table

6 The mirrors create an image of a circle

divided into wedges Record the number

of wedges

7 Hold the R mirror still and slowly move the Lmirror to 90deg Record the numbers of images

of the clip and wedges in the circle Repeat

this time opening the mirrors to 120deg

Conclude and Apply1 Infer the relationship between the number

of wedges and paper clip images

2 Determine the angle that would divide a

circle into six wedges Hypothesize how

many images would be produced Test your

hypothesis

Reflections of Reflections

Demonstrate for younger students the

relationship between the angle of the

mirrors and the number of reflections

338 CHAPTER 11 Sound and Light

Angle

Number of Number

of Mirrors Paper Clip Images

of Wedges R L

72ordm

90ordm

120ordm

Images and Wedges Seen in the Mirrors

Do not write in this book

SECTION 4 Light and Color 339

Why Objects Have ColorWhy do some apples appear red while others look green or

yellow An objectrsquos color depends on the wavelengths of light itreflects Recall that white light is a blend of all colors of visiblelight When a red apple is struck by white light it reflects redlight back to your eyes and absorbs all of the other colorsFigure 24 shows white light striking a green leaf Only the wave-lengths corresponding to green light are reflected to your eyes

Although some objects appear to be black black isnrsquot acolor Black is the absence of visible light Objects that appearblack absorb all colors of light and reflect little or no light backto your eyes White objects appear to be white because theyreflect all colors of visible light

Why does a white object appear white

Colored Filters Wearing tinted glasses changesthe color of almost everything you see If the lensesare yellow the world takes on a golden glow If theyare rose colored everything looks rosy Somethingsimilar would occur if you placed a colored clearplastic sheet over this white page The paper wouldappear to be the same color as the plastic The plasticsheet and the tinted lenses are filters A filter is atransparent material that transmits one or more col-ors of light but absorbs all others The color of a fil-ter is the color of the light that it transmits

Light and Color

Reading Guide

Explain how you see color Describe the difference between

light color and pigment color Predict what happens when dif-

ferent colors are mixed

From traffic lights to great works of

art color is an important part of your

world

Review Vocabulary

retina inner layer of the eye con-

taining cells that convert light

images into electrical signals

New Vocabulary

bull pigment

Figure 24 This leaf absorbs all

wavelengths of visible light except

the wavelengths you see as green

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340 CHAPTER 11 Sound and Light

Looking Through Colored Filters Figure 25 shows howthe color of an object can change when you look at it throughvarious colored filters The cooler looks blue under white lightbecause it reflects only the wavelengths of blue light that strikeit If you look at the cooler through a blue filter the cooler stilllooks blue because the blue filter transmits the reflected bluelight However if you look at the cooler through a red filter thecooler seems black because the red filter blocks the blue lightreflected by the cooler

Why does a blue object appear black whenviewed through a red filter

Seeing ColorAs you approach a busy intersection the color of the traffic

light changes from green to yellow to red On the cross street thecolor changes from red to green At a busy intersection trafficsafety depends on your ability to detect color changes rapidlyHow do you see colors

Light and the Eye In a healthy eye light enters the eyethrough the cornea is focused by the lens and finally forms animage on the retina The retina is made up of two types of cellsthat absorb light as shown in Figure 26 When these cellsabsorb light energy chemical reactions convert light energy intonerve impulses that are transmitted to the brain One type ofcell in the retina called a cone enables you to distinguish colorsand detailed shapes of objects Cones need bright light to gener-ate nerve impulses so they do not operate in dim light As aresult even brightly colored objects might look gray or black indim light

Figure 25 The color of this

cooler changes when viewed

through different color filters

Topic Color BlindnessVisit for Web

links to information about the

causes of color blindness

Activity Research the causes

and types of color blindness Find

out how cones are related to the

ability to distinguish colors

gpesciencecom

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SECTION 4 Light and Color 341

Cones and Rods Your eyes have three types of cones each ofwhich responds to a different range of wavelengths Red conesrespond to mostly red and yellow light Green cones respond tomostly yellow and green light Blue cones respond to mostlyblue and violet light The second type of cell in the retina calleda rod is sensitive to dim light and enables you to see at nightHowever rod cells do not enable you to see colors

Interpreting Color Why does a bananalook yellow The light reflected by the

banana causes the cone cells that are sensitive to red and greenlight to send signals to your brain Your brain could get the samesignal if a mixture of red light and green light reached your eyesThis mixture also would cause your red and green cones torespond and you would see the color yellow As a result lightwith wavelengths corresponding to yellow light and light that isa mixture of red and green light both cause the color yellow tobe seen What happens when you look at a white shirt You seewhite when all wavelengths of visible light enters your eyes Thenall three sets of cones cells send signals to the brain The com-bination of these signals cause you to see the shirt as white

Color Blindness If one or more of your sets of cone cellsdo not function properly you might not be able to distinguishcertain colors This condition is called color blindness orcolor deficiency About eight percent of men and one-halfpercent of women have some form of color blindness Themost common form of color blindness makes it difficult todistinguish between red and green Figure 27 shows an imagethat is used in a test for redndashgreen color blindness Becausered and green are used in traffic signals drivers and pedestri-ans must be able to identify them

Retina

Rod

Cone

Lens

Figure 27 Color blindness is an

inherited sex-linked condition in

which certain sets of cones in the

retina do not function properly

Identify the number that you seein the dots

Figure 26 Light enters the eye

and focuses on the retina The two

types of light-detecting cells

that make up the retina

are called rods and cones

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342 CHAPTER 11 Sound and Light

Mixing ColorsIf you have ever browsed through a paint store you have

probably seen displays where customers can select paint samplesof almost every imaginable color The colors are a result of mix-tures of pigments For example you might have mixed blue andyellow paint to produce green paint A pigment is a coloredmaterial that is used to change the color of other substancesThe color of a pigment results from the different wavelengths oflight that the pigment reflects

Mixing Colored Lights From the glowing orange of a sun-set to the deep blue of a mountain lake all the colors you see canbe made by mixing three colors of light These three colorsmdashred green and bluemdashare the primary colors of light They cor-respond to the three different types of cones in the retina ofyour eye When mixed together in equal amounts they producewhite light as Figure 28 shows Mixing the primary colors indifferent proportions can produce the colors you see

What are the primary colors of light

Paint Pigments If you were to mix equal amounts of redgreen and blue paint would you get white paint If mixing col-ors of paint were like mixing colors of light you would but mix-ing paint is different Paints are made with pigments Pigmentsproduce color as a result of the wavelengths of light they reflectPaint pigments usually are made of chemical compounds suchas titanium oxide a bright white pigment and lead chromatewhich is used for painting yellow lines on highways

Figure 28 White light is pro-

duced when the three primary col-

ors of light are mixed in equal

amounts

Color for PhotosynthesisPlant pigments determinethe wavelengths oflight for photosynthesisLeaves usually look greenbecause of the pigmentchlorophyll Chlorophyllabsorbs most wave-lengths of visible lightexcept green which itreflects However not allplants are green Researchdifferent plant pigmentsto find out how they allowplant species to survive indiverse habitats

GPS+_342

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89129135

eng - iTunNORM 0000026F 00000000 000023FD 00000000 0000C8EB 00000000 00006149 00000000 000059CB 00000000

SECTION 4 Light and Color 343

Self Check

1 Identity what colors are reflected and what colors are

absorbed if a white light shines on a red shirt

2 Discuss how the primary colors of light differ from the

primary pigment colors

3 Explain why a red apple would appear black if you

looked at it through a blue filter

4 Determine why a white fence appears to be white instead

of multicolored if all colors are present in white light

5 Think Critically Light reflected from an object passes

through a green filter then a red filter and finally a

blue filter What color will the object seem to be

Summary

Why Objects Have Color

bull The color of an object is determined by the

wavelengths of light it reflects

bull The color of a filter is the color of the light the

filter transmits

Seeing Color

bull Rod and cone cells are light-sensitive cells

found in the retina of the human eye

bull Rod cells are sensitive to dim light Cone cells

enable colors to be seen

bull There are three types of cone cells One type

responds to red light another to green light

and another to blue light

Mixing Colors

bull Red green and blue are the primary light

colors Any color of light can be created by

mixing these primary light colors

bull Any pigment color can be formed by mixing

the primary pigment colorsmdashmagenta cyan

and yellow

6 Use Percentages In the human eye there are about

120000000 rods If 90000000 rods trigger at once

what percentage of the total number of rods triggered

7 Convert Units The wavelengths of light are measured

in nanometers (nm) which equals 0000001 mm

Find the wavelength in mm of a light wave that has a

wavelength of 690 nm

Mixing Pigments You can make any pigment color by mixingdifferent amounts of the three primary pigmentsmdashmagenta(bluish red) cyan (greenish blue) and yellow In fact color print-ers use these pigments as well as black ink to make full-colorprints like the pages in this book A primary pigmentrsquos colordepends on the wavelengths of the light that it reflects Actuallypigments both absorb and reflect a range of colors in sending asingle color message to your eye For example in white lightyellow pigment appears yellow because it reflects red and greenlight but absorbs the other wavelengths of visible light The colorof a mixture of two primary pigments is determined by theprimary colors of light that both pigments reflect

Look at Figure 29 The area in the center where the colors alloverlap appears to be black because the three blended primarypigments absorb all the primary colors of light Recall that theprimary colors of light combine to produce white light They arecalled additive colors However when the primary pigment col-ors are combined they absorb all wavelengths of visible light andproduce black Because black results from the absence ofreflected light the primary pigments are called subtractive colors

Figure 29 The three primary

pigment colors appear to be black

when they are mixed

Describe how the primary pigmentcolors are similar to the primary col-ors of light

More Section Review gpesciencecom

GPS+_343

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7230715

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Design Your OwnDesign Your Own

344

Real-World ProblemWhat loud noises do you enjoy and which ones do you find annoying

Most people enjoy a music concert performed by their favorite artist or

the booming displays of fireworks on the Fourth of July Most people

enjoy these loud sounds for short periods of time However certain

other loud noises such as traffic sirens and loud talking can be

annoying Constant annoying noises are called noise pollution What

can be done to reduce noise pollution What types of barriers will best

block out noise pollution

Form a HypothesisBased on your experiences with loud noises form a hypothesis that

predicts the effectiveness of different types of barriers at blocking out

noise pollution

Test Your HypothesisMake a Plan

1 Complete the safety form

2 Decide what type of barriers or materials you will test

3 Describe exactly how you will use these materials

Goals Design an experiment

that tests the effective-

ness of various types of

barriers and materials

for blocking out noise

pollution

Test different types of

materials and barriers

to determine the best

noise blocks

Possible Materialsradio CD player horn

drum or other loud

noise source

shrubs trees concrete

walls brick walls stone

walls wooden fences

parked cars or hanging

laundry

sound meter

meterstick or metric tape

measure

Blocking NfisePollution

4 Identify the controls and variables you will use in your

experiment

5 List the steps you will use and describe each step precisely

6 Prepare a data table in your Science Journal to record your

measurements

7 Organize the steps of your experiment in logical order

Follow Your Plan

1 Ask your teacher to approve your plan and data table before

you start

2 Conduct your experiment as planned

3 Test each barrier two or three times

4 Record the results from each test in your data table in your Science Journal

Analyze Your Data1 Identify the barriers that most effectively reduced noise pollution

2 Identify the barriers that least effectively reduced noise pollution

3 Compare the effective barriers and identify common characteristics that might

explain why they reduced noise pollution

4 Compare the natural barriers you tested with the artificial barriers Which type

of barrier best reduced noise pollution

5 Compare the different types of materials the barriers were made of Which

type of material best reduced noise pollution

Conclude and Apply1 Evaluate whether your results support your hypothesis

2 Predict how your results would differ if you used a louder source of noise such

as a siren

3 Infer from your results how people living near a

busy street could reduce noise pollution

4 Identify major sources of noise pollution in or

near your home How could they be reduced

5 Research how noise pollution can be

unhealthy

LAB 345

Draw a poster illustrating how builders and

landscapers could use certain materials to

better insulate a home or office from excess

noise pollution

346 CHAPTER 11 Sound and Light

A Haiku GardenThe Four Seasons in Poems and Prints

by Stephen Addiss with Fumiko and Akira Yamamoto

Respond to the Reading1 How do the illustrations help the reader

better understand the poems2 What do you think is meant by the

word lingering in the Haiku about springsunlight

3 Linking Science and Writing Writeone haiku about summer and anotherabout fall In one poem use color tohelp you describe the season In theother use light or some property oflight to help describe the season

Research has deter-mined that there is a

connection between color and mood Warmcolors have longer wavelengths and can bemore stimulating Cool colors which haveshorter wavelengths tend to have a calmingor soothing effect on people Light and colorhave long been used as literary symbols Doesthe use of color change what you imaginewhen you read the haiku

UnderstandingLiteratureJapanese Haiku A haiku is a verse thatconsists of three lines and 17 syllables inthe Japanese language The first and thirdlines have five syllables each and themiddle line has seven syllables Why isimagination important in reading haiku

Lingering

in every pool of watermdash

spring sunlightIssa

Withered by winter

the sound of the windmdash

one-color worldBasho

Sound

1 Sound waves are compressional waves thattravel only in matter

2 The speed of sound in a material dependson the type of material as well as itstemperature

3 Loudness depends on a sound waversquos inten-sity Pitch depends on a sound waversquosfrequency

4 Sound waves are used in echolocationsonar and medical imaging

Reflection and Refractionof Light

1 Light can be absorbed reflected or trans-mitted by a material

2 When light waves are reflected theyobey the law of reflectionmdashthe angle ofincidence equals the angle of reflection

3 A light wave is refracted or bent whenit changes speed as it travels at an anglefrom one material to another

Mirrors Lenses andthe Eye

1 Plane mirrors form upright virtual images

2 Images formed by concave mirrors andconvex lenses depend on the location ofthe object relative to the focal point

3 Convex mirrors and concave lenses formvirtual upright images that are smallerthan the object

4 The lens in the human eye changes shape toproduce a sharp image on the retina

Light and Color

1 You see color when light is reflected offobjects and into your eyes

2 Cone cells in the retina are light-sensitivecells that enable you to distinguish colors

3 Red blue and green are the three primarycolors of light and can be mixed to form allother colors

4 The primary pigment colors are magentacyan and yellow

CHAPTER STUDY GUIDE 347

Use the Foldable you made at the beginningof the chapter to help you review sound and light

Interactive Tutor gpesciencecom

Complete each statement with the correctvocabulary word or phrase

1 A change in frequency due to a movingsound source is due to the

2 A flat smooth surface that reflects light andforms an image is a(n)

3 An object is if you can seethrough it clearly

4 The of a material indicates howmuch the speed of light in the materialchanges as light passes through

5 You can change the color of white paint byadding a(n) to it

6 A(n) is a reflecting surface thatcurves outward like the back of a spoon

7 The human perception of the intensity of asound wave is

Choose the word or phrase that best answerseach question

8 Which of the following best describes imageformation by a plane mirrorA) A real image is formed in front of the mirrorB) A real image is formed behind the mirrorC) A virtual image is formed in front of the

mirrorD) A virtual image is formed behind the mirror

9 For a sound with low pitch what else isalso always lowA) amplitude C) wavelengthB) frequency D) wave velocity

10 Which of the following occurs when asound source moves away from youA) The soundrsquos velocity decreasesB) The soundrsquos loudness increasesC) The soundrsquos frequency decreasesD) The soundrsquos frequency increases

Use the table below to answer question 11

11 Based on the data in the table abovewhich of the following would be the speedof sound in air at 30degCA) 3404 ms C) 3494 msB) 3464 ms D) 3534 ms

12 What happens to a light ray travelingparallel to the optical axis of a convexlens that passes through the lensA) It travels parallel to the optical axisB) It passes through the focal pointC) It is bent away from the optical axisD) It forms a virtual image

13 Light waves of which color are bent mostwhen passing through a prismA) blue C) violetB) red D) yellow

14 Which way does a concave lens bend lightA) toward its optical axisB) toward its centerC) toward its edgesD) toward its focal point

Speed of Sound in Air

Temp peed( s)

4

4

4

348 CHAPTER REVIEW

concave lens p 335concave mirror p 332convex lens p 333convex mirror p 333decibel p 322Doppler effect p 323index of refraction p 329intensity p 322

loudness p 322opaque p 327pigment p 342pitch p 323plane mirror p 331translucent p 327transparent p 327

Vocabulary PuzzleMaker gpesciencecom

Use the illustration below to answer question 15

15 Describe how the position of the candlechanged if the image of the candle movedaway from the focal point

16 Apply Acoustic scientists sometimes doresearch in rooms that absorb all soundwaves How could such a room be used tostudy how bats find their food

17 Compare White light passes through atranslucent pane of glass and shines on ashirt Both the translucent glass and theshirt appear green Compare the colors oflight that are absorbed and transmitted bythe glass and the shirt

18 Infer Most mammals including dogs andcats canrsquot see colors Infer how the retinaof a catrsquos eye might be different from theretina of a human eye

19 Determine whether a convex lens could forman image that is enlarged real and upright

20 Infer A car comes to a railroad crossingThe driver hears a trainrsquos whistle and itspitch becomes lower What can beassumed about how the train is moving

21 Compare and contrast the reflection of lightfrom a white wall with a rough surfacewith the reflection of light from a mirror

Optical axis

One

focal

length

Two

focal

lengths

Image

Ray A

Object

Focal

point

Interpreting Graphics 22 Infer why a convex mirror and a concavelens can never produce a real image

23 Predict what color a white shirt wouldappear to be if the light reflected from theshirt passed through a red filter and thenthrough a green filter

24 Explain why windows might begin to rattlewhen an airplane flies overhead

25 Communicate Some people enjoy usingsnowmobiles Others object to the noisethat they make Write a proposal for a pol-icy that seems fair to both groups for theuse of snowmobiles in a state park

CHAPTER REVIEW 349

Use the wave speed equation ν ƒλ to answer

questions 26 and 27

26 Calculate Frequency A sonar pulse has awavelength of 30 cm and a speed inwater of 1500 ms Find its frequency

27 Calculate Wavelength What is the wave-length of a sound wave with a fre-quency of 440 Hz if the speed of soundin air is 340 ms

28 Calculate Angle of Incidence A light ray isreflected from a mirror If the anglebetween the incident ray and thereflected ray is 136deg what is the angleof incidence

29 Determine Object Distance You hold anobject in front of a concave mirror witha focal length of 30 cm If you do notsee a reflected image how far from themirror is the object

30 Calculate Speed The speed of light in avacuum is 300000 kms If the index ofrefraction of water is 133 what is thespeed of light in water

More Chapter Review gpesciencecom

1 Which of the following describes the imageformed by a convex mirror

A enlarged

B inverted

C real

D virtual

Use the figure below to answer question 2

2 Which of the following describes a light raythat passes through the focal point andthen is reflected by the mirror

A It travels parallel to the optical axis

B It forms a real image

C It is reflected back through the focal point

D It forms a virtual image

3 Why does an apple look red

A It reflects red light

B It absorbs red light

C It reflects green and blue light

D It reflects all colors of light except red

Use the figure below to answer questions 4 and 5

4 When the primary colors of light are addedtogether what color appears in area H

A cyan

B magenta

C white

D yellow

5 When the primary colors of light are addedtogether what color appears in area G

A cyan

B magenta

C white

D yellow

6 Which of the following increases as the fre-quency of a sound increases

A amplitude

B intensity

C loudness

D pitch

Red Blue

Green

F

H

G K

Focal pointOptical axis

350 STANDARDIZED TEST PRACTICE

Record your answers on the answer sheet provided by your teacher or on a sheet of paper

STANDARDIZED TEST PRACTICE 351

7 Which of the following parts of the eyeenable you to see colors in bright light

A cone cells

B cornea

C lens

D rod cells

Use the graph below to answer questions 8 and 9

8 Determine how far in centimeters theimage is from the lens when the object is15 centimeters from the lens

9 How far in centimeters is the object fromthe lens when the image distance andobject distance are equal

10 A shirt has stripes that are black and whitein white light If green light shines on thisshirt what colors will the black and whitestripes be

11 If you are on a moving train what hap-pens to the pitch of a crossing bell as youapproach the crossing and then moveaway from the crossing

Use the figure below to answer question 12

12 Describe the vision problem show by thefigure and explain how this vision prob-lem can be corrected

13 Explain why the human eye can see colorsbetter in bright light than in dim light

Image Distance fora Convex Lens

Ima

ge

dis

tan

ce (

cm)

30

25

20

15

10

5 10 15 20 25 30

Object distance (cm)

Standardized Test Practice gpesciencecom

Note Units Read carefully and make note of the units used in

any measurement

  • Glencoe Physical Science with Earth Science
    • Student Edition Table of Contents
      • Unit 1 Science and Technology
        • Chapter 1 The Nature of Science
          • Launch Lab Understanding Measurements
          • Foldables
          • Section 1 The Methods of Science
            • Science Online
            • Integrate History
            • Integrate Earth Science
            • Science Online
              • Section 2 Standards of Measurement
                • Applying Math Centimeters
                • Integrate Earth Science
                • Science Online
                • MiniLAB Determining the Density of a Pencil
                • Visualizing SI Dimensions
                  • Section 3 Communicating with Graphs
                    • Applying Math Temperature
                    • MiniLAB Graphing Temperature Change
                    • Lab Whats my graph
                    • Lab Design Your Own - Developing a Measurement System
                    • Science and Language Arts Thinking in Pictures and Other Reports from My Life with Autism
                      • Chapter 1 Study Guide
                      • Chapter 1 Review
                      • Chapter 1 Standardized Test Practice
                        • Chapter 2 Science Technology and Society
                          • Lab Technology in Your Life
                          • Foldables
                          • Section 1 Science and Technology
                            • MiniLAB Researching the Past
                            • Visualizing Technology Supplying Basic Needs
                            • Science Online
                              • Section 2 Forces that Shape Technology
                                • MiniLAB Evaluating the Benefits and Consequences of Technology
                                • Integrate Environment
                                • Integrate History
                                • Applying Science What impact does the accident at Chernobyl have on the future of nuclear power
                                • Science Online
                                • Lab Who contributes CO2
                                  • Section 3 Developing Technology
                                    • Integrate Life Science
                                    • Integrate Career
                                    • Lab Model and Invent - Care Package
                                    • Oops Accidents in Science A Slippery Situation
                                      • Chapter 2 Study Guide
                                      • Chapter 2 Review
                                      • Chapter 2 Standardized Test Practice
                                          • Unit 2 Motion Forces and Energy
                                            • Chapter 3 Motion Acceleration and Forces
                                              • Launch Lab Compare Speeds
                                              • Foldables
                                              • Section 1 Describing Motion
                                                • MiniLAB Measuring Average Speed
                                                • Science Online
                                                • Applying Math Average Speed
                                                • Integrate Astronomy
                                                • Science Online
                                                  • Section 2 Acceleration
                                                    • Integrate History
                                                    • Visualizing Acceleration
                                                      • Section 3 Motion and Forces
                                                        • Science Online
                                                        • MiniLAB Comparing Friction
                                                        • Lab Force and Acceleration
                                                        • Lab Design Your Own - Comparing Motion from Different Forces
                                                        • Science and Language Arts A Brave and Startling Truth
                                                          • Chapter 3 Study Guide
                                                          • Chapter 3 Review
                                                          • Chapter 3 Standardized Test Practice
                                                            • Chapter 4 The Laws of Motion
                                                              • Launch Lab The Force of Gravity
                                                              • Foldables
                                                              • Section 1 The First Two Laws of Motion
                                                                • MiniLAB Observing Inertia
                                                                • Science Online
                                                                • Applying Math The Acceleration of a Sled Solve a Simple Equation
                                                                  • Section 2 Gravity
                                                                    • Science Online
                                                                    • Integrate Earth Science
                                                                    • MiniLAB Observing Centripetal Force
                                                                    • Lab Gravity and Air Resistance
                                                                      • Section 3 The Third Law of Motion
                                                                        • Integrate Career
                                                                        • Visualizing Rocket Motion
                                                                        • Applying Math The Momentum of a Sprinter
                                                                        • Lab The Momentum of Colliding Objects
                                                                        • Science and History Newton and the Plague
                                                                          • Chapter 4 Study Guide
                                                                          • Chapter 4 Review
                                                                          • Chapter 4 Standardized Test Practice
                                                                            • Chapter 5 Energy
                                                                              • Launch Lab Energy Conversions
                                                                              • Foldables
                                                                              • Section 1 The Nature of Energy
                                                                                • Science Online
                                                                                • Applying Math Kinetic Energy
                                                                                • MiniLAB Interpreting Data from a Slingshot
                                                                                • Integrate Language Arts
                                                                                • Applying Math Gravitational Potential Energy
                                                                                • Lab Bouncing Balls
                                                                                  • Section 2 Conservation of Energy
                                                                                    • Visualizing Energy Transformations
                                                                                    • Integrate Environment
                                                                                    • MiniLAB Transforming Energy in a Paper Clip
                                                                                    • Science Online
                                                                                    • Integrate Health
                                                                                    • Lab Design Your Own - Swinging Energy
                                                                                    • Science and History The Impossible Dream
                                                                                      • Chapter 5 Study Guide
                                                                                      • Chapter 5 Review
                                                                                      • Chapter 5 Standardized Test Practice
                                                                                        • Chapter 6 Work and Machines
                                                                                          • Launch Lab Doing Work with a Simple Machine
                                                                                          • Foldables
                                                                                          • Section 1 Work
                                                                                            • Integrate Language Arts
                                                                                            • Applying Math Work
                                                                                            • MiniLAB Calculating Your Work and Power
                                                                                            • Applying Math Power
                                                                                              • Section 2 Using Machines
                                                                                                • MiniLAB Machines Multiplying Force
                                                                                                • Science Online
                                                                                                • Integrate Chemistry
                                                                                                  • Section 3 Simple Machines
                                                                                                    • Integrate History
                                                                                                    • Visualizing Levers in the Human Body
                                                                                                    • Science Online
                                                                                                    • Lab Levers
                                                                                                    • Lab Model and Invent - Using Simple Machines
                                                                                                    • Science and Society The Science of Very Very Small
                                                                                                      • Chapter 6 Study Guide
                                                                                                      • Chapter 6 Review
                                                                                                      • Chapter 6 Standardized Test Practice
                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                          • Launch Lab Relative Sizes of Earth the Moon and the Sun
                                                                                                          • Foldables
                                                                                                          • Section 1 Earth in Space
                                                                                                            • Science Online
                                                                                                            • Integrate Physics
                                                                                                              • Section 2 Time and Seasons
                                                                                                                • MiniLAB Modeling the Suns Rays at Solstice
                                                                                                                • Lab Comparing the Angle of Sunlight to Intensity
                                                                                                                  • Section 3 Earths Moon
                                                                                                                    • Applying Math Tides
                                                                                                                    • MiniLAB Modeling Phases and Eclipses
                                                                                                                    • Integrate History
                                                                                                                    • Integrate History
                                                                                                                    • Science Online
                                                                                                                    • Visualizing Water on the Moon
                                                                                                                    • Lab Identifying the Moons Surface Features and Apollo Landing Sites
                                                                                                                    • Oops Accidents in Science Even Great Scientists Make Mistakes
                                                                                                                      • Chapter 7 Study Guide
                                                                                                                      • Chapter 7 Review
                                                                                                                      • Chapter 7 Standardized Test Practice
                                                                                                                        • Chapter 8 The Solar System
                                                                                                                          • Launch Lab The Size of the Solar System
                                                                                                                          • Foldables
                                                                                                                          • Section 1 Planet Motion
                                                                                                                            • Integrate History
                                                                                                                            • MiniLAB Plotting Retrograde Motion
                                                                                                                            • Integrate Physics
                                                                                                                            • Applying Math Heliocentric Longitude (HL)
                                                                                                                              • Section 2 The Inner Planets
                                                                                                                                • Science Online
                                                                                                                                • Integrate Chemistry
                                                                                                                                • Lab Interpreting Features of Marss Surface
                                                                                                                                  • Section 3 The Outer Planets
                                                                                                                                    • Integrate Language Arts
                                                                                                                                    • Visualizing What Galileo Saw
                                                                                                                                    • Science Online
                                                                                                                                    • MiniLAB Comparing Sizes of Outer and Inner Planets
                                                                                                                                      • Section 4 Life in the Solar System
                                                                                                                                        • Lab Design Your Own - Testing Unknown Soil Samples for Life
                                                                                                                                        • Science Stats Night Sky Wonders
                                                                                                                                          • Chapter 8 Study Guide
                                                                                                                                          • Chapter 8 Review
                                                                                                                                          • Chapter 8 Standardized Test Practice
                                                                                                                                              • Unit 3 Energy in Motion
                                                                                                                                                • Chapter 9 Heat and States of Matter
                                                                                                                                                  • Launch Lab Expansion of a Gas
                                                                                                                                                  • Foldables
                                                                                                                                                  • Section 1 Temperature and Thermal Energy
                                                                                                                                                    • Applying Math Converting to Celsius
                                                                                                                                                    • Science Online
                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                    • Applying Math Change in Thermal Energy
                                                                                                                                                      • Section 2 States of Matter
                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                        • Science Online
                                                                                                                                                        • MiniLAB Comparing States of Water
                                                                                                                                                          • Section 3 Transferring Thermal Energy
                                                                                                                                                            • MiniLAB Comparing Thermal Conductors
                                                                                                                                                            • Visualizing Convection Currents
                                                                                                                                                            • Lab Convection in Gases and Liquids
                                                                                                                                                              • Section 4 Using Thermal Energy
                                                                                                                                                                • Integrate History
                                                                                                                                                                • Science Online
                                                                                                                                                                • Lab Conduction in Gases
                                                                                                                                                                • Science Stats Surprising Thermal Energy
                                                                                                                                                                  • Chapter 9 Study Guide
                                                                                                                                                                  • Chapter 9 Review
                                                                                                                                                                  • Chapter 9 Standardized Test Practice
                                                                                                                                                                    • Chapter 10 Waves
                                                                                                                                                                      • Launch Lab How do waves transfer energy
                                                                                                                                                                      • Foldables
                                                                                                                                                                      • Section 1 The Nature of Waves
                                                                                                                                                                        • Visualizing Formation of Ocean Waves
                                                                                                                                                                        • Science Online
                                                                                                                                                                          • Section 2 Wave Properties
                                                                                                                                                                            • MiniLAB Observing Wavelength
                                                                                                                                                                            • Integrate Social Studies
                                                                                                                                                                            • Applying Math The Speed of Sound
                                                                                                                                                                            • Lab Wave Speed and Tension
                                                                                                                                                                              • Section 3 The Behavior of Waves
                                                                                                                                                                                • Science Online
                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                • MiniLAB Experimenting with Resonance
                                                                                                                                                                                • Lab Measuring Wave Properties
                                                                                                                                                                                • Science and History Making Waves
                                                                                                                                                                                  • Chapter 10 Study Guide
                                                                                                                                                                                  • Chapter 10 Review
                                                                                                                                                                                  • Chapter 10 Standardized Test Practice
                                                                                                                                                                                    • Chapter 11 Sound and Light
                                                                                                                                                                                      • Launch Lab What sound does a ruler make
                                                                                                                                                                                      • Foldables
                                                                                                                                                                                      • Section 1 Sound
                                                                                                                                                                                        • MiniLAB Comparing Intensity
                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                        • Science Online
                                                                                                                                                                                        • Applying Math Using Sonar
                                                                                                                                                                                          • Section 2 Reflection and Refraction of Light
                                                                                                                                                                                          • Section 3 Mirrors Lenses and the Eye
                                                                                                                                                                                            • Visualizing Images Formed by a Convex Lens
                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                            • MiniLAB Experimenting with Focal Lengths
                                                                                                                                                                                            • Lab Reflections of Reflections
                                                                                                                                                                                              • Section 4 Light and Color
                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Lab Design Your Own - Blocking Noise Pollution
                                                                                                                                                                                                • Science and Language Arts A Haiku Garden The Four Seasons in Poems and Print
                                                                                                                                                                                                  • Chapter 11 Study Guide
                                                                                                                                                                                                  • Chapter 11 Review
                                                                                                                                                                                                  • Chapter 11 Standardized Test Practice
                                                                                                                                                                                                    • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                      • Launch Lab Global Jigsaw Puzzle
                                                                                                                                                                                                      • Foldables
                                                                                                                                                                                                      • Section 1 Evolution of Earths Crust
                                                                                                                                                                                                        • Applying Math Spreading Distances
                                                                                                                                                                                                        • Integrate Physics
                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                          • Section 2 Earthquakes
                                                                                                                                                                                                            • MiniLAB Demonstrating Four Types of Stress
                                                                                                                                                                                                            • Visualizing Earthquake-Proof Buildings
                                                                                                                                                                                                              • Section 3 Earths Interior
                                                                                                                                                                                                              • Section 4 Volcanoes
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • MiniLAB Modeling Lava Viscosity
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                • Lab A Case for Pacific Plate Motion
                                                                                                                                                                                                                • Lab Earthquake Earthquake Wheres the earthquake
                                                                                                                                                                                                                • Science and History Volcano Weather
                                                                                                                                                                                                                  • Chapter 12 Study Guide
                                                                                                                                                                                                                  • Chapter 12 Review
                                                                                                                                                                                                                  • Chapter 12 Standardized Test Practice
                                                                                                                                                                                                                      • Unit 4 Forms of Energy
                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                          • Launch Lab Electric Circuits
                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                          • Section 1 Electric Charge
                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                            • Visualizing Lightning
                                                                                                                                                                                                                            • MiniLAB Investigate Charged Objects
                                                                                                                                                                                                                              • Section 2 Electric Current
                                                                                                                                                                                                                                • MiniLAB Investigating Battery Addition
                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                • Lab Identifying Conductors and Insulators
                                                                                                                                                                                                                                  • Section 3 Electrical Energy
                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                    • Applying Math Power Used by a Clothes Dryer
                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                    • Applying Math Electrical Energy Used by a Microwave Oven
                                                                                                                                                                                                                                    • Lab Design Your Own - Comparing Series and Parallel Circuits
                                                                                                                                                                                                                                    • Science and Language Arts Invisible Man
                                                                                                                                                                                                                                      • Chapter 13 Study Guide
                                                                                                                                                                                                                                      • Chapter 13 Review
                                                                                                                                                                                                                                      • Chapter 13 Standardized Test Practice
                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                          • Launch Lab The Strength of Magnets
                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                          • Section 1 Magnetism
                                                                                                                                                                                                                                            • MiniLAB Observing Magnetic Interference
                                                                                                                                                                                                                                            • Integrate Earth Science
                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                            • Applying Science How can magnetic parts of a junk car be salvaged
                                                                                                                                                                                                                                            • MiniLAB Making Your Own Compass
                                                                                                                                                                                                                                              • Section 2 Electricity and Magnetism
                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                  • Section 3 Producing Electric Current
                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                    • Visualizing Motors and Generators
                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                    • Lab Electricity and Magnetism
                                                                                                                                                                                                                                                    • Lab Design Your Own - Controlling Electromagnets
                                                                                                                                                                                                                                                    • Science and History Body Art
                                                                                                                                                                                                                                                      • Chapter 14 Study Guide
                                                                                                                                                                                                                                                      • Chapter 14 Review
                                                                                                                                                                                                                                                      • Chapter 14 Standardized Test Practice
                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                          • Launch Lab Can electromagnetic waves change materials
                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                          • Section 1 What are electromagnetic waves
                                                                                                                                                                                                                                                            • MiniLAB Investigating Electromagnetic Waves
                                                                                                                                                                                                                                                            • Applying Math The Speed of Light in Water
                                                                                                                                                                                                                                                              • Section 2 The Electromagnetic Spectrum
                                                                                                                                                                                                                                                                • MiniLAB Heating with Microwaves
                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                • Lab The Shape of Satellite Dishes
                                                                                                                                                                                                                                                                  • Section 3 Radio Communication
                                                                                                                                                                                                                                                                    • Visualizing Radio Broadcasts
                                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Lab Use the Internet - Radio Frequencies
                                                                                                                                                                                                                                                                    • Science and History Riding a Beam of Light
                                                                                                                                                                                                                                                                      • Chapter 15 Study Guide
                                                                                                                                                                                                                                                                      • Chapter 15 Review
                                                                                                                                                                                                                                                                      • Chapter 15 Standardized Test Practice
                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                          • Launch Lab Heating with Solar Energy
                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                          • Section 1 Fossil Fuels
                                                                                                                                                                                                                                                                            • Visualizing The Formation of Fossil Fuels
                                                                                                                                                                                                                                                                            • MiniLAB Designing an Efficient Water Heater
                                                                                                                                                                                                                                                                              • Section 2 Nuclear Energy
                                                                                                                                                                                                                                                                                • Integrate Earth Science
                                                                                                                                                                                                                                                                                • Integrate Social Science
                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                • Applying Science Can a contaminated radioactive site be reclaimed
                                                                                                                                                                                                                                                                                  • Section 3 Renewable Energy Sources
                                                                                                                                                                                                                                                                                    • MiniLAB Using Solar Power at Home
                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                    • Lab Solar Heating
                                                                                                                                                                                                                                                                                    • Lab Use the Internet How much does energy really cost
                                                                                                                                                                                                                                                                                    • Science and Society Reacting to Nuclear Energy
                                                                                                                                                                                                                                                                                      • Chapter 16 Study Guide
                                                                                                                                                                                                                                                                                      • Chapter 16 Review
                                                                                                                                                                                                                                                                                      • Chapter 16 Standardized Test Practice
                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                          • Lab Atmospheric Pressure
                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                          • Section 1 Earths Atmosphere
                                                                                                                                                                                                                                                                                            • MiniLAB Visualizing Convection
                                                                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                                                                            • Lab Visualizing a Temperature Inversion
                                                                                                                                                                                                                                                                                              • Section 2 Weather
                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Coriolis Effect
                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                  • Section 3 Climate
                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                    • Visualizing Earths Biogeophysical System
                                                                                                                                                                                                                                                                                                      • Section 4 Earths Changing Climates
                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                        • Applying Math Carbon Dioxide (CO2) Concentration
                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Investigating Microclimate
                                                                                                                                                                                                                                                                                                        • Science and Language Arts The Grapes of Wrath
                                                                                                                                                                                                                                                                                                          • Chapter 17 Study Guide
                                                                                                                                                                                                                                                                                                          • Chapter 17 Review
                                                                                                                                                                                                                                                                                                          • Chapter 17 Standardized Test Practice
                                                                                                                                                                                                                                                                                                              • Unit 5 Matter and Earth Materials
                                                                                                                                                                                                                                                                                                                • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                  • Launch Lab Demonstrate the Distillation of Water
                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                  • Section 1 Composition of Matter
                                                                                                                                                                                                                                                                                                                    • Visualizing Elements
                                                                                                                                                                                                                                                                                                                    • MiniLAB Classifying Materials
                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                    • Lab Comparing Pure Substances and Mixtures
                                                                                                                                                                                                                                                                                                                      • Section 2 Properties of Matter
                                                                                                                                                                                                                                                                                                                        • Integrate Environment
                                                                                                                                                                                                                                                                                                                        • MiniLAB Separating Ink
                                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                                        • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                        • Applying Math The Law of Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Measuring the Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Science Stats Intriguing Elements
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Study Guide
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Review
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                            • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                              • Launch Lab Inferring What You Cant Observe
                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                              • Section 1 Structure of the Atom
                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling an Aluminum Atom
                                                                                                                                                                                                                                                                                                                                • Visualizing The Atomic Model
                                                                                                                                                                                                                                                                                                                                  • Section 2 Masses of Atoms
                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                    • Applying Science How can radioactive isotopes help tell time
                                                                                                                                                                                                                                                                                                                                      • Section 3 The Periodic Table
                                                                                                                                                                                                                                                                                                                                        • MiniLAB Organizing a Personal Periodic Table
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Career
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                                                                                                                                                                        • Lab A Periodic Table of Foods
                                                                                                                                                                                                                                                                                                                                        • Lab Use the Internet Whats in a name
                                                                                                                                                                                                                                                                                                                                        • Science and History A Chilling Story
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Study Guide
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Review
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                            • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                              • Launch Lab Earth Materials at Home and School
                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                              • Section 1 Minerals
                                                                                                                                                                                                                                                                                                                                                • MiniLAB Identifying Salts Crystal System
                                                                                                                                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                • Lab Be a Mineral Detective
                                                                                                                                                                                                                                                                                                                                                  • Section 2 Igneous Rocks
                                                                                                                                                                                                                                                                                                                                                    • Applying Math Extrusive Igneous Rock Classification
                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                      • Section 3 Sedimentary Rocks
                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Evaporites
                                                                                                                                                                                                                                                                                                                                                          • Section 4 Metamorphic Rocks and the Rock Cycle
                                                                                                                                                                                                                                                                                                                                                            • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                            • Visualizing Shock Metamorphic Rock
                                                                                                                                                                                                                                                                                                                                                            • Lab Identifying Rocks
                                                                                                                                                                                                                                                                                                                                                            • Science and Society Earth Materials at Work
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Study Guide
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Review
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                  • Launch Lab Have you got the time
                                                                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                                                                  • Section 1 Weathering and Soil
                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing a Disappearing Seasoning
                                                                                                                                                                                                                                                                                                                                                                    • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                    • Lab Graphing Soil Textures
                                                                                                                                                                                                                                                                                                                                                                      • Section 2 Shaping the Landscape
                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Runoff
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                          • Section 3 Groundwater
                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Porosity Volume
                                                                                                                                                                                                                                                                                                                                                                            • Visualizing The Role of Groundwater in Shaping Earths Surface
                                                                                                                                                                                                                                                                                                                                                                            • Integrate Environment
                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                              • Section 4 Geologic Time
                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                                                                                                • Lab Its about time - relative that is
                                                                                                                                                                                                                                                                                                                                                                                • Science and Society Tapping into the Underground
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Review
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                      • Unit 6 Interactions of Matter
                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                          • Lab Chemical Bonds and Mixing
                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Stability in Bonding
                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                            • Lab Atomic Trading Cards
                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Types of Bonds
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Observing a Bond Type
                                                                                                                                                                                                                                                                                                                                                                                                • Visualizing Polar Molecules
                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Writing Formulas and Naming Compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math Determining a Formula
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Science Can you name binary ionic compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Making a Hydrate
                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Model and Invent - Modeling Chemical Bonding
                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Sticky Subject
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Review
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab RustingmdashA Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Chemical Changes
                                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Designing a Team Equation
                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Chemical Equations
                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math Barium Sulfate Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Classifying Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 4 Reaction Rates and Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing Chemical Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Creating a Colorful Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab To Glow or Not to Glow
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Investigating Reaction Conditions
                                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Clumsy Move Pays Off
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Review
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab Magic Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 How Solutions Form
                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                                                                                                                                                                                                                                                            • Visualizing Metal Alloys
                                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Observing the Effect of Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Solubility and Concentration
                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Acids Bases and Salts
                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing Acid Relief
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Strength of Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Determining Acidity
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Saturated Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and Society Acid Rain
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab The Size of a Nucleus
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Strong Force
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Nuclear Decay
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Detecting Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math The Age of Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Social Studies
                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Nuclear Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling a Nuclear Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Visualizing PET Scans
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Chain Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Model and Invent Modeling Transmutations
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and History The Nuclear Alchemist
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 26 Stars and Galaxies
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab Stars in the Sky
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Observing the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling a Telescope
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math The Magnifying Power of Telescopes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Evolution of Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Counting Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing H-R Diagrams of Star Clusters
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Star Cluster Age
                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 3 Galaxies and the Milky Way
                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 4 Cosmology
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Lab Model and Invent - Expansion of the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Science and Language Arts Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Student Resources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Skill Handbook
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Scientific Methods
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Safety Symbols
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Safety in the Science Laboratory
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Math Skill Handbook
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Math Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Science Applications
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Formulas
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Extra Math Problems
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Reference Handbook
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Minerals
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Physical Science Reference Tables
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Periodic Table of the Elements
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Weather Map Symbols
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                • EnglishSpanish Glossary
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Index
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Credits
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Students Workbooks
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter Resources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 1 The Nature of Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 2 Science Technology and Society
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 3 Motion Acceleration and Forces
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 4 The Laws of Motion
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 5 Energy
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 6 Work and Machines
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 8 The Solar System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 9 Heat and States of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 10 Waves
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 11 Sound and Light
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 26 Stars and Galaxies
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Additional Resources
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Page 16: 706 S1 318-326 GPS09 - Light-and-Sound - home · PDF fileWhat sound does a ruler make? ... sound waves cannot travel in empty space where there are no particles. ... sound travels

SECTION 3 Mirrors Lenses and the Eye 333

Images Produced by a ConcaveMirror When an object is between oneand two focal lengths from a concavemirror the image is real inverted andlarger than the object An object closerthan one focal length from a concavemirror produces a virtual image that isupright and larger than the object Noimage is produced if the object islocated at the focal point

Convex Mirrors When you are in astore look up toward one of the backcorners or at the end of an aisle to see ifa large rounded mirror is mountedthere You can see a large area of the store in such a mirror Amirror that curves outward like the back of a spoon is called aconvex mirror Light rays that hit a convex mirror diverge orspread apart after they are reflected Figure 17 shows how therays from an object are reflected by a convex mirror to form animage The reflected rays diverge and never meet so a convexmirror forms only a virtual image The image also is upright andsmaller than the actual object is

Describe the image formed by a convex mirror

LensesWhat do your eyes have in common with cameras eyeglasses

and microscopes Each of these contains at least one lens A lens is atransparent object with at least one curved surface that causes lightrays to refract The image that a lens forms depends on the shape ofthe lens Like curved mirrors lenses can be convex or concave

Convex Lenses A convex lens is thicker in the middle than atthe edges Its optical axis is an imaginary straight line that is per-pendicular to the surface of the lens at its thickest point When lightrays approach a convex lens traveling parallel to its opticalaxis the rays are refracted toward the center of the lens asin Figure 18 Light rays traveling along the optical axis arenot bent at all All light rays traveling parallel to the opti-cal axis are refracted so they pass through a single pointwhich is the focal point of the lens The less curved thesides of the lens the less light rays are bent As a resultlenses with flatter sides have longer focal lengths Figure 19

on the next page shows that convex lenses can form eitherreal or virtual images

Figure 18 Convex lenses are

thicker in the middle than at the

edges Light rays that are parallel

to the optical axis are refracted so

that they pass through the focal

point A light ray that passes

through the center of the lens is

not refracted

Figure 17 A convex mirror

forms a reduced upright virtual

image

Optical axis

Ray A

Ray B

Focallength

Focalpoint

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Figure 19

VISUALIZING IMAGES FORMED BY A CONVEX LENS

334 CHAPTER 11 Sound and Light

Aconvex lens can form images that are real or virtual enlarged or reduced and upright orinverted Just as for a concave mirror the type of image formed by a convex lens depends on thelocation of the object relative to the focal point of the lens

Optical axis

One

focal

length

Two

focal

lengthsRay B

Image

Ray A

Object

Focal

point

Optical axis

One

focal

length

Two

focal

lengths

Ray B

Ray AObject

Image

Focal

point

Optical axis

Ray B

ObjectRay A

One

focal

length

Focal

pointImage

If the object is more than two focal lengths from the lens the image formed is real inverted andsmaller than the object As the object moves farther from the lens the image becomes smaller

If the object is between one and two focal lengths from the lens the image formed is real invertedand larger than the object As the object moves closer to the focal point the image becomes larger

If the object is less than one focal length from the lens the image is virtual upright and larger thanthe object The image is virtual because the light rays from the object diverge after they pass throughthe lens The image becomes smaller as the object moves closer to the lens

SECTION 3 Mirrors Lenses and the Eye 335

Concave Lenses A concave lens is thinnerin the middle and thicker at the edges Asshown in Figure 20 light rays that passthrough a concave lens bend away from theoptical axis The rays spread out and nevermeet so a real image is never formed Theimage is always virtual upright and smallerthan the object is Concave lenses are used insome types of eyeglasses and some telescopesConcave lenses usually are used in combinationwith other lenses

What type of image is formed by a concave lens

The Human EyeWhat determines how well you can see the words on this

page If you donrsquot need eyeglasses the structure of your eye givesyou the ability to focus on these words and other objects aroundyou Look at Figure 21 Light enters your eye through a trans-parent covering on your eyeball called the cornea The corneacauses light rays to bend so that they converge The light thenpasses through an opening called the pupil Behind the pupil isa flexible convex lens Muscles attached to the lens change itsshape to help focus light forming a sharp image on your retina

The retina is the inner lining of your eye The retina con-tains light-sensitive cells that convert an image into electricalsignals These signals then are carried along the optic nerve toyour brain to be interpreted With this complex structurethe human eye is capable of seeing clearly in bright and dimconditions focusing on both near and far objects and alsodetecting colors

Figure 20 A concave lens

refracts light rays so they spread

out away from the optical axis

Classify Is a concave lens mostlike a concave mirror or a convexmirror

Optical axis

Retina

Focalpoint

Pupil

Cornea

Lens

Optic nerve

Figure 21 The cornea and lens in your eye

bend light rays so that a sharp image is

formed on the retina

Eye Doctors Optometristsand ophthalmologists treatmany different eye prob-lems They often useadvanced technology todiagnose and correct mal-functioning parts of theeye Research an eye prob-lem and how it is treatedWrite a paragraph describ-ing what parts of the eyeare affected by the problemand how doctors correct it

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336 CHAPTER 11 Sound and Light

Brightness and Intensity The human eye can adjust to thebrightness of the light that strikes it If you step outside on asunny day you may have to shade your eyes against the intensityof the sunlight Light intensity is the amount of light energy thatstrikes a certain area each second Brightness is the human per-ception of light intensity Sunlight seems bright because a largeamount of light energy strikes your retina each second Youreyes respond to bright light by decreasing the size of your pupilThis reduces the amount of light that enters your eye and strikesthe retina

Intensity depends on your distance from a light source Ifyou move away from a bare lightbulb you can see how theintensity of the light rapidly decreases Because light rays spreadout from the source less light energy strikes your retina thefarther away you are from the bulb

Correcting Vision ProblemsIf you have good vision you should be able to see objects

clearly when they are 25 cm or farther away from your eyes Asharp image of an object should be formed on your retinaHowever for many people the image is blurry or formed in thewrong place causing vision problems

Farsightedness If you can see distant objects clearly butcanrsquot bring nearby objects into focus then you are farsighted Inthis case the eyeball might be too short or the lens isnrsquot curvedenough to form a sharp image of nearby objects on the retinaas shown in Figure 22 To correct the problem convex lensescan be used to bend incoming light rays so they converge beforethey enter the eye

Experimenting withFocal LengthsProcedure1 Complete the safety form

2 Fill a glass test tube with

water and seal it with a

lid or stopper3 Type or print SULFUR

DIOXIDE in capital letters

on a piece of paper4 Set the test tube horizon-

tally over the words

Record your observations

5 Hold the tube at several

heights above the words

Record your observations

Analysis1 Describe how the words

changed as the height of

the test tube increased

2 Classify the image at each

height as real or virtual

Focal

point

Correctedfarsighted eye

Light fromnearby object

Focalpoint

Light fromnearby object

Farsighted eye

The focal length of a farsighted eye is too long to form

a sharp image of nearby objects on the retina

A convex lens in front of a farsighted eye enables a sharp

image of nearby objects to be formed on the retina

Figure 22 Farsightedness can

be corrected by convex lenses

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SECTION 3 Mirrors Lenses and the Eye 337

Self Check

1 Diagram how light rays from an object are reflected by

a convex mirror to form an image

2 Infer how the size of the image changes if an object

that is less than one focal length from a concave mirror

moves closer to the mirror

3 Explain how the focal length of a convex lens changes

as the sides of the lens become less curved

4 Compare the image of an object less than one focal

length from a convex lens with the image of an object

more than two focal lengths from the lens

5 Think Critically Describe the image formed by a light

source placed at the focal point of a convex lens

Summary

Mirrors

bull A plane mirror forms upright virtual images

bull The image formed by a concave mirror

depends on the location of the object relative

to the focal point

bull Convex mirrors always produce virtual upright

images that are smaller than the object

Lenses

bull The image formed by a convex lens depends

on the distance of the object from the lens

bull Concave lenses always form virtual upright

images that are smaller than the object

The Eye and Vision

bull The eye contains a lens that changes shape to

produce sharp images on the retina

bull Farsightedness occurs when the eye cannot

form a sharp image of nearby objects

Nearsightedness occurs when the eye cannot

form sharp images of distant objects

6 Calculate Object Distance If you looked through a

convex lens with a focal length of 15 cm and saw a

real inverted enlarged image what is the maximum

distance between the lens and the object

Nearsightedness If you have nearsighted friends you knowthat they can see only nearby objects clearly Their eyes cannotform a sharp image on the retina of an object that is far awayInstead the image is formed in front of the retina as shown inFigure 23 To correct this problem a nearsighted person canwear concave lenses Figure 23 shows how a concave lens causesincoming light rays from distant objects to diverge before theyreach the eye Then the rays can be focused by the eye to form asharp image on the retina

Figure 23 Nearsightedness can

be corrected with concave lenses

Focalpoint

Light fromdistant object

Nearsighted eye

Focalpoint

Light fromdistant object

Correctednearsighted eye

When a nearsighted person looks at distant objects a

sharp image is formed in front of the retina

A concave lens in front of a nearsighted eye makes light

rays diverge so a sharp image is formed on the retina

More Section Review gpesciencecom

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How can you see the back of your head You

can use two mirrors to view a reflection of a

reflection of the back of your head

Real-World ProblemHow many images are seen in two mirrors

Goal Infer how the number of images depends

on the angle between two mirrors

Materialsplane mirrors (2) protractor

masking tape paper clip

Safety Precautions

Handle glass mirrors and paper clips carefully

Procedure1 Complete the safety form

2 Lay one mirror on top of the other with the

mirror surfaces together Tape together one

side so they can open and close Use tape to

label them L and R for left and right

3 Open the mirrors and stand them on a sheet

of paper at an angle of 72deg

4 Bend one leg of a paper clip up 90deg and

place it close to the front of the R mirror

5 Count the number of images of the paper

clip you see in the R and L mirrors Record

these numbers in your data table

6 The mirrors create an image of a circle

divided into wedges Record the number

of wedges

7 Hold the R mirror still and slowly move the Lmirror to 90deg Record the numbers of images

of the clip and wedges in the circle Repeat

this time opening the mirrors to 120deg

Conclude and Apply1 Infer the relationship between the number

of wedges and paper clip images

2 Determine the angle that would divide a

circle into six wedges Hypothesize how

many images would be produced Test your

hypothesis

Reflections of Reflections

Demonstrate for younger students the

relationship between the angle of the

mirrors and the number of reflections

338 CHAPTER 11 Sound and Light

Angle

Number of Number

of Mirrors Paper Clip Images

of Wedges R L

72ordm

90ordm

120ordm

Images and Wedges Seen in the Mirrors

Do not write in this book

SECTION 4 Light and Color 339

Why Objects Have ColorWhy do some apples appear red while others look green or

yellow An objectrsquos color depends on the wavelengths of light itreflects Recall that white light is a blend of all colors of visiblelight When a red apple is struck by white light it reflects redlight back to your eyes and absorbs all of the other colorsFigure 24 shows white light striking a green leaf Only the wave-lengths corresponding to green light are reflected to your eyes

Although some objects appear to be black black isnrsquot acolor Black is the absence of visible light Objects that appearblack absorb all colors of light and reflect little or no light backto your eyes White objects appear to be white because theyreflect all colors of visible light

Why does a white object appear white

Colored Filters Wearing tinted glasses changesthe color of almost everything you see If the lensesare yellow the world takes on a golden glow If theyare rose colored everything looks rosy Somethingsimilar would occur if you placed a colored clearplastic sheet over this white page The paper wouldappear to be the same color as the plastic The plasticsheet and the tinted lenses are filters A filter is atransparent material that transmits one or more col-ors of light but absorbs all others The color of a fil-ter is the color of the light that it transmits

Light and Color

Reading Guide

Explain how you see color Describe the difference between

light color and pigment color Predict what happens when dif-

ferent colors are mixed

From traffic lights to great works of

art color is an important part of your

world

Review Vocabulary

retina inner layer of the eye con-

taining cells that convert light

images into electrical signals

New Vocabulary

bull pigment

Figure 24 This leaf absorbs all

wavelengths of visible light except

the wavelengths you see as green

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340 CHAPTER 11 Sound and Light

Looking Through Colored Filters Figure 25 shows howthe color of an object can change when you look at it throughvarious colored filters The cooler looks blue under white lightbecause it reflects only the wavelengths of blue light that strikeit If you look at the cooler through a blue filter the cooler stilllooks blue because the blue filter transmits the reflected bluelight However if you look at the cooler through a red filter thecooler seems black because the red filter blocks the blue lightreflected by the cooler

Why does a blue object appear black whenviewed through a red filter

Seeing ColorAs you approach a busy intersection the color of the traffic

light changes from green to yellow to red On the cross street thecolor changes from red to green At a busy intersection trafficsafety depends on your ability to detect color changes rapidlyHow do you see colors

Light and the Eye In a healthy eye light enters the eyethrough the cornea is focused by the lens and finally forms animage on the retina The retina is made up of two types of cellsthat absorb light as shown in Figure 26 When these cellsabsorb light energy chemical reactions convert light energy intonerve impulses that are transmitted to the brain One type ofcell in the retina called a cone enables you to distinguish colorsand detailed shapes of objects Cones need bright light to gener-ate nerve impulses so they do not operate in dim light As aresult even brightly colored objects might look gray or black indim light

Figure 25 The color of this

cooler changes when viewed

through different color filters

Topic Color BlindnessVisit for Web

links to information about the

causes of color blindness

Activity Research the causes

and types of color blindness Find

out how cones are related to the

ability to distinguish colors

gpesciencecom

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SECTION 4 Light and Color 341

Cones and Rods Your eyes have three types of cones each ofwhich responds to a different range of wavelengths Red conesrespond to mostly red and yellow light Green cones respond tomostly yellow and green light Blue cones respond to mostlyblue and violet light The second type of cell in the retina calleda rod is sensitive to dim light and enables you to see at nightHowever rod cells do not enable you to see colors

Interpreting Color Why does a bananalook yellow The light reflected by the

banana causes the cone cells that are sensitive to red and greenlight to send signals to your brain Your brain could get the samesignal if a mixture of red light and green light reached your eyesThis mixture also would cause your red and green cones torespond and you would see the color yellow As a result lightwith wavelengths corresponding to yellow light and light that isa mixture of red and green light both cause the color yellow tobe seen What happens when you look at a white shirt You seewhite when all wavelengths of visible light enters your eyes Thenall three sets of cones cells send signals to the brain The com-bination of these signals cause you to see the shirt as white

Color Blindness If one or more of your sets of cone cellsdo not function properly you might not be able to distinguishcertain colors This condition is called color blindness orcolor deficiency About eight percent of men and one-halfpercent of women have some form of color blindness Themost common form of color blindness makes it difficult todistinguish between red and green Figure 27 shows an imagethat is used in a test for redndashgreen color blindness Becausered and green are used in traffic signals drivers and pedestri-ans must be able to identify them

Retina

Rod

Cone

Lens

Figure 27 Color blindness is an

inherited sex-linked condition in

which certain sets of cones in the

retina do not function properly

Identify the number that you seein the dots

Figure 26 Light enters the eye

and focuses on the retina The two

types of light-detecting cells

that make up the retina

are called rods and cones

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342 CHAPTER 11 Sound and Light

Mixing ColorsIf you have ever browsed through a paint store you have

probably seen displays where customers can select paint samplesof almost every imaginable color The colors are a result of mix-tures of pigments For example you might have mixed blue andyellow paint to produce green paint A pigment is a coloredmaterial that is used to change the color of other substancesThe color of a pigment results from the different wavelengths oflight that the pigment reflects

Mixing Colored Lights From the glowing orange of a sun-set to the deep blue of a mountain lake all the colors you see canbe made by mixing three colors of light These three colorsmdashred green and bluemdashare the primary colors of light They cor-respond to the three different types of cones in the retina ofyour eye When mixed together in equal amounts they producewhite light as Figure 28 shows Mixing the primary colors indifferent proportions can produce the colors you see

What are the primary colors of light

Paint Pigments If you were to mix equal amounts of redgreen and blue paint would you get white paint If mixing col-ors of paint were like mixing colors of light you would but mix-ing paint is different Paints are made with pigments Pigmentsproduce color as a result of the wavelengths of light they reflectPaint pigments usually are made of chemical compounds suchas titanium oxide a bright white pigment and lead chromatewhich is used for painting yellow lines on highways

Figure 28 White light is pro-

duced when the three primary col-

ors of light are mixed in equal

amounts

Color for PhotosynthesisPlant pigments determinethe wavelengths oflight for photosynthesisLeaves usually look greenbecause of the pigmentchlorophyll Chlorophyllabsorbs most wave-lengths of visible lightexcept green which itreflects However not allplants are green Researchdifferent plant pigmentsto find out how they allowplant species to survive indiverse habitats

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SECTION 4 Light and Color 343

Self Check

1 Identity what colors are reflected and what colors are

absorbed if a white light shines on a red shirt

2 Discuss how the primary colors of light differ from the

primary pigment colors

3 Explain why a red apple would appear black if you

looked at it through a blue filter

4 Determine why a white fence appears to be white instead

of multicolored if all colors are present in white light

5 Think Critically Light reflected from an object passes

through a green filter then a red filter and finally a

blue filter What color will the object seem to be

Summary

Why Objects Have Color

bull The color of an object is determined by the

wavelengths of light it reflects

bull The color of a filter is the color of the light the

filter transmits

Seeing Color

bull Rod and cone cells are light-sensitive cells

found in the retina of the human eye

bull Rod cells are sensitive to dim light Cone cells

enable colors to be seen

bull There are three types of cone cells One type

responds to red light another to green light

and another to blue light

Mixing Colors

bull Red green and blue are the primary light

colors Any color of light can be created by

mixing these primary light colors

bull Any pigment color can be formed by mixing

the primary pigment colorsmdashmagenta cyan

and yellow

6 Use Percentages In the human eye there are about

120000000 rods If 90000000 rods trigger at once

what percentage of the total number of rods triggered

7 Convert Units The wavelengths of light are measured

in nanometers (nm) which equals 0000001 mm

Find the wavelength in mm of a light wave that has a

wavelength of 690 nm

Mixing Pigments You can make any pigment color by mixingdifferent amounts of the three primary pigmentsmdashmagenta(bluish red) cyan (greenish blue) and yellow In fact color print-ers use these pigments as well as black ink to make full-colorprints like the pages in this book A primary pigmentrsquos colordepends on the wavelengths of the light that it reflects Actuallypigments both absorb and reflect a range of colors in sending asingle color message to your eye For example in white lightyellow pigment appears yellow because it reflects red and greenlight but absorbs the other wavelengths of visible light The colorof a mixture of two primary pigments is determined by theprimary colors of light that both pigments reflect

Look at Figure 29 The area in the center where the colors alloverlap appears to be black because the three blended primarypigments absorb all the primary colors of light Recall that theprimary colors of light combine to produce white light They arecalled additive colors However when the primary pigment col-ors are combined they absorb all wavelengths of visible light andproduce black Because black results from the absence ofreflected light the primary pigments are called subtractive colors

Figure 29 The three primary

pigment colors appear to be black

when they are mixed

Describe how the primary pigmentcolors are similar to the primary col-ors of light

More Section Review gpesciencecom

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Design Your OwnDesign Your Own

344

Real-World ProblemWhat loud noises do you enjoy and which ones do you find annoying

Most people enjoy a music concert performed by their favorite artist or

the booming displays of fireworks on the Fourth of July Most people

enjoy these loud sounds for short periods of time However certain

other loud noises such as traffic sirens and loud talking can be

annoying Constant annoying noises are called noise pollution What

can be done to reduce noise pollution What types of barriers will best

block out noise pollution

Form a HypothesisBased on your experiences with loud noises form a hypothesis that

predicts the effectiveness of different types of barriers at blocking out

noise pollution

Test Your HypothesisMake a Plan

1 Complete the safety form

2 Decide what type of barriers or materials you will test

3 Describe exactly how you will use these materials

Goals Design an experiment

that tests the effective-

ness of various types of

barriers and materials

for blocking out noise

pollution

Test different types of

materials and barriers

to determine the best

noise blocks

Possible Materialsradio CD player horn

drum or other loud

noise source

shrubs trees concrete

walls brick walls stone

walls wooden fences

parked cars or hanging

laundry

sound meter

meterstick or metric tape

measure

Blocking NfisePollution

4 Identify the controls and variables you will use in your

experiment

5 List the steps you will use and describe each step precisely

6 Prepare a data table in your Science Journal to record your

measurements

7 Organize the steps of your experiment in logical order

Follow Your Plan

1 Ask your teacher to approve your plan and data table before

you start

2 Conduct your experiment as planned

3 Test each barrier two or three times

4 Record the results from each test in your data table in your Science Journal

Analyze Your Data1 Identify the barriers that most effectively reduced noise pollution

2 Identify the barriers that least effectively reduced noise pollution

3 Compare the effective barriers and identify common characteristics that might

explain why they reduced noise pollution

4 Compare the natural barriers you tested with the artificial barriers Which type

of barrier best reduced noise pollution

5 Compare the different types of materials the barriers were made of Which

type of material best reduced noise pollution

Conclude and Apply1 Evaluate whether your results support your hypothesis

2 Predict how your results would differ if you used a louder source of noise such

as a siren

3 Infer from your results how people living near a

busy street could reduce noise pollution

4 Identify major sources of noise pollution in or

near your home How could they be reduced

5 Research how noise pollution can be

unhealthy

LAB 345

Draw a poster illustrating how builders and

landscapers could use certain materials to

better insulate a home or office from excess

noise pollution

346 CHAPTER 11 Sound and Light

A Haiku GardenThe Four Seasons in Poems and Prints

by Stephen Addiss with Fumiko and Akira Yamamoto

Respond to the Reading1 How do the illustrations help the reader

better understand the poems2 What do you think is meant by the

word lingering in the Haiku about springsunlight

3 Linking Science and Writing Writeone haiku about summer and anotherabout fall In one poem use color tohelp you describe the season In theother use light or some property oflight to help describe the season

Research has deter-mined that there is a

connection between color and mood Warmcolors have longer wavelengths and can bemore stimulating Cool colors which haveshorter wavelengths tend to have a calmingor soothing effect on people Light and colorhave long been used as literary symbols Doesthe use of color change what you imaginewhen you read the haiku

UnderstandingLiteratureJapanese Haiku A haiku is a verse thatconsists of three lines and 17 syllables inthe Japanese language The first and thirdlines have five syllables each and themiddle line has seven syllables Why isimagination important in reading haiku

Lingering

in every pool of watermdash

spring sunlightIssa

Withered by winter

the sound of the windmdash

one-color worldBasho

Sound

1 Sound waves are compressional waves thattravel only in matter

2 The speed of sound in a material dependson the type of material as well as itstemperature

3 Loudness depends on a sound waversquos inten-sity Pitch depends on a sound waversquosfrequency

4 Sound waves are used in echolocationsonar and medical imaging

Reflection and Refractionof Light

1 Light can be absorbed reflected or trans-mitted by a material

2 When light waves are reflected theyobey the law of reflectionmdashthe angle ofincidence equals the angle of reflection

3 A light wave is refracted or bent whenit changes speed as it travels at an anglefrom one material to another

Mirrors Lenses andthe Eye

1 Plane mirrors form upright virtual images

2 Images formed by concave mirrors andconvex lenses depend on the location ofthe object relative to the focal point

3 Convex mirrors and concave lenses formvirtual upright images that are smallerthan the object

4 The lens in the human eye changes shape toproduce a sharp image on the retina

Light and Color

1 You see color when light is reflected offobjects and into your eyes

2 Cone cells in the retina are light-sensitivecells that enable you to distinguish colors

3 Red blue and green are the three primarycolors of light and can be mixed to form allother colors

4 The primary pigment colors are magentacyan and yellow

CHAPTER STUDY GUIDE 347

Use the Foldable you made at the beginningof the chapter to help you review sound and light

Interactive Tutor gpesciencecom

Complete each statement with the correctvocabulary word or phrase

1 A change in frequency due to a movingsound source is due to the

2 A flat smooth surface that reflects light andforms an image is a(n)

3 An object is if you can seethrough it clearly

4 The of a material indicates howmuch the speed of light in the materialchanges as light passes through

5 You can change the color of white paint byadding a(n) to it

6 A(n) is a reflecting surface thatcurves outward like the back of a spoon

7 The human perception of the intensity of asound wave is

Choose the word or phrase that best answerseach question

8 Which of the following best describes imageformation by a plane mirrorA) A real image is formed in front of the mirrorB) A real image is formed behind the mirrorC) A virtual image is formed in front of the

mirrorD) A virtual image is formed behind the mirror

9 For a sound with low pitch what else isalso always lowA) amplitude C) wavelengthB) frequency D) wave velocity

10 Which of the following occurs when asound source moves away from youA) The soundrsquos velocity decreasesB) The soundrsquos loudness increasesC) The soundrsquos frequency decreasesD) The soundrsquos frequency increases

Use the table below to answer question 11

11 Based on the data in the table abovewhich of the following would be the speedof sound in air at 30degCA) 3404 ms C) 3494 msB) 3464 ms D) 3534 ms

12 What happens to a light ray travelingparallel to the optical axis of a convexlens that passes through the lensA) It travels parallel to the optical axisB) It passes through the focal pointC) It is bent away from the optical axisD) It forms a virtual image

13 Light waves of which color are bent mostwhen passing through a prismA) blue C) violetB) red D) yellow

14 Which way does a concave lens bend lightA) toward its optical axisB) toward its centerC) toward its edgesD) toward its focal point

Speed of Sound in Air

Temp peed( s)

4

4

4

348 CHAPTER REVIEW

concave lens p 335concave mirror p 332convex lens p 333convex mirror p 333decibel p 322Doppler effect p 323index of refraction p 329intensity p 322

loudness p 322opaque p 327pigment p 342pitch p 323plane mirror p 331translucent p 327transparent p 327

Vocabulary PuzzleMaker gpesciencecom

Use the illustration below to answer question 15

15 Describe how the position of the candlechanged if the image of the candle movedaway from the focal point

16 Apply Acoustic scientists sometimes doresearch in rooms that absorb all soundwaves How could such a room be used tostudy how bats find their food

17 Compare White light passes through atranslucent pane of glass and shines on ashirt Both the translucent glass and theshirt appear green Compare the colors oflight that are absorbed and transmitted bythe glass and the shirt

18 Infer Most mammals including dogs andcats canrsquot see colors Infer how the retinaof a catrsquos eye might be different from theretina of a human eye

19 Determine whether a convex lens could forman image that is enlarged real and upright

20 Infer A car comes to a railroad crossingThe driver hears a trainrsquos whistle and itspitch becomes lower What can beassumed about how the train is moving

21 Compare and contrast the reflection of lightfrom a white wall with a rough surfacewith the reflection of light from a mirror

Optical axis

One

focal

length

Two

focal

lengths

Image

Ray A

Object

Focal

point

Interpreting Graphics 22 Infer why a convex mirror and a concavelens can never produce a real image

23 Predict what color a white shirt wouldappear to be if the light reflected from theshirt passed through a red filter and thenthrough a green filter

24 Explain why windows might begin to rattlewhen an airplane flies overhead

25 Communicate Some people enjoy usingsnowmobiles Others object to the noisethat they make Write a proposal for a pol-icy that seems fair to both groups for theuse of snowmobiles in a state park

CHAPTER REVIEW 349

Use the wave speed equation ν ƒλ to answer

questions 26 and 27

26 Calculate Frequency A sonar pulse has awavelength of 30 cm and a speed inwater of 1500 ms Find its frequency

27 Calculate Wavelength What is the wave-length of a sound wave with a fre-quency of 440 Hz if the speed of soundin air is 340 ms

28 Calculate Angle of Incidence A light ray isreflected from a mirror If the anglebetween the incident ray and thereflected ray is 136deg what is the angleof incidence

29 Determine Object Distance You hold anobject in front of a concave mirror witha focal length of 30 cm If you do notsee a reflected image how far from themirror is the object

30 Calculate Speed The speed of light in avacuum is 300000 kms If the index ofrefraction of water is 133 what is thespeed of light in water

More Chapter Review gpesciencecom

1 Which of the following describes the imageformed by a convex mirror

A enlarged

B inverted

C real

D virtual

Use the figure below to answer question 2

2 Which of the following describes a light raythat passes through the focal point andthen is reflected by the mirror

A It travels parallel to the optical axis

B It forms a real image

C It is reflected back through the focal point

D It forms a virtual image

3 Why does an apple look red

A It reflects red light

B It absorbs red light

C It reflects green and blue light

D It reflects all colors of light except red

Use the figure below to answer questions 4 and 5

4 When the primary colors of light are addedtogether what color appears in area H

A cyan

B magenta

C white

D yellow

5 When the primary colors of light are addedtogether what color appears in area G

A cyan

B magenta

C white

D yellow

6 Which of the following increases as the fre-quency of a sound increases

A amplitude

B intensity

C loudness

D pitch

Red Blue

Green

F

H

G K

Focal pointOptical axis

350 STANDARDIZED TEST PRACTICE

Record your answers on the answer sheet provided by your teacher or on a sheet of paper

STANDARDIZED TEST PRACTICE 351

7 Which of the following parts of the eyeenable you to see colors in bright light

A cone cells

B cornea

C lens

D rod cells

Use the graph below to answer questions 8 and 9

8 Determine how far in centimeters theimage is from the lens when the object is15 centimeters from the lens

9 How far in centimeters is the object fromthe lens when the image distance andobject distance are equal

10 A shirt has stripes that are black and whitein white light If green light shines on thisshirt what colors will the black and whitestripes be

11 If you are on a moving train what hap-pens to the pitch of a crossing bell as youapproach the crossing and then moveaway from the crossing

Use the figure below to answer question 12

12 Describe the vision problem show by thefigure and explain how this vision prob-lem can be corrected

13 Explain why the human eye can see colorsbetter in bright light than in dim light

Image Distance fora Convex Lens

Ima

ge

dis

tan

ce (

cm)

30

25

20

15

10

5 10 15 20 25 30

Object distance (cm)

Standardized Test Practice gpesciencecom

Note Units Read carefully and make note of the units used in

any measurement

  • Glencoe Physical Science with Earth Science
    • Student Edition Table of Contents
      • Unit 1 Science and Technology
        • Chapter 1 The Nature of Science
          • Launch Lab Understanding Measurements
          • Foldables
          • Section 1 The Methods of Science
            • Science Online
            • Integrate History
            • Integrate Earth Science
            • Science Online
              • Section 2 Standards of Measurement
                • Applying Math Centimeters
                • Integrate Earth Science
                • Science Online
                • MiniLAB Determining the Density of a Pencil
                • Visualizing SI Dimensions
                  • Section 3 Communicating with Graphs
                    • Applying Math Temperature
                    • MiniLAB Graphing Temperature Change
                    • Lab Whats my graph
                    • Lab Design Your Own - Developing a Measurement System
                    • Science and Language Arts Thinking in Pictures and Other Reports from My Life with Autism
                      • Chapter 1 Study Guide
                      • Chapter 1 Review
                      • Chapter 1 Standardized Test Practice
                        • Chapter 2 Science Technology and Society
                          • Lab Technology in Your Life
                          • Foldables
                          • Section 1 Science and Technology
                            • MiniLAB Researching the Past
                            • Visualizing Technology Supplying Basic Needs
                            • Science Online
                              • Section 2 Forces that Shape Technology
                                • MiniLAB Evaluating the Benefits and Consequences of Technology
                                • Integrate Environment
                                • Integrate History
                                • Applying Science What impact does the accident at Chernobyl have on the future of nuclear power
                                • Science Online
                                • Lab Who contributes CO2
                                  • Section 3 Developing Technology
                                    • Integrate Life Science
                                    • Integrate Career
                                    • Lab Model and Invent - Care Package
                                    • Oops Accidents in Science A Slippery Situation
                                      • Chapter 2 Study Guide
                                      • Chapter 2 Review
                                      • Chapter 2 Standardized Test Practice
                                          • Unit 2 Motion Forces and Energy
                                            • Chapter 3 Motion Acceleration and Forces
                                              • Launch Lab Compare Speeds
                                              • Foldables
                                              • Section 1 Describing Motion
                                                • MiniLAB Measuring Average Speed
                                                • Science Online
                                                • Applying Math Average Speed
                                                • Integrate Astronomy
                                                • Science Online
                                                  • Section 2 Acceleration
                                                    • Integrate History
                                                    • Visualizing Acceleration
                                                      • Section 3 Motion and Forces
                                                        • Science Online
                                                        • MiniLAB Comparing Friction
                                                        • Lab Force and Acceleration
                                                        • Lab Design Your Own - Comparing Motion from Different Forces
                                                        • Science and Language Arts A Brave and Startling Truth
                                                          • Chapter 3 Study Guide
                                                          • Chapter 3 Review
                                                          • Chapter 3 Standardized Test Practice
                                                            • Chapter 4 The Laws of Motion
                                                              • Launch Lab The Force of Gravity
                                                              • Foldables
                                                              • Section 1 The First Two Laws of Motion
                                                                • MiniLAB Observing Inertia
                                                                • Science Online
                                                                • Applying Math The Acceleration of a Sled Solve a Simple Equation
                                                                  • Section 2 Gravity
                                                                    • Science Online
                                                                    • Integrate Earth Science
                                                                    • MiniLAB Observing Centripetal Force
                                                                    • Lab Gravity and Air Resistance
                                                                      • Section 3 The Third Law of Motion
                                                                        • Integrate Career
                                                                        • Visualizing Rocket Motion
                                                                        • Applying Math The Momentum of a Sprinter
                                                                        • Lab The Momentum of Colliding Objects
                                                                        • Science and History Newton and the Plague
                                                                          • Chapter 4 Study Guide
                                                                          • Chapter 4 Review
                                                                          • Chapter 4 Standardized Test Practice
                                                                            • Chapter 5 Energy
                                                                              • Launch Lab Energy Conversions
                                                                              • Foldables
                                                                              • Section 1 The Nature of Energy
                                                                                • Science Online
                                                                                • Applying Math Kinetic Energy
                                                                                • MiniLAB Interpreting Data from a Slingshot
                                                                                • Integrate Language Arts
                                                                                • Applying Math Gravitational Potential Energy
                                                                                • Lab Bouncing Balls
                                                                                  • Section 2 Conservation of Energy
                                                                                    • Visualizing Energy Transformations
                                                                                    • Integrate Environment
                                                                                    • MiniLAB Transforming Energy in a Paper Clip
                                                                                    • Science Online
                                                                                    • Integrate Health
                                                                                    • Lab Design Your Own - Swinging Energy
                                                                                    • Science and History The Impossible Dream
                                                                                      • Chapter 5 Study Guide
                                                                                      • Chapter 5 Review
                                                                                      • Chapter 5 Standardized Test Practice
                                                                                        • Chapter 6 Work and Machines
                                                                                          • Launch Lab Doing Work with a Simple Machine
                                                                                          • Foldables
                                                                                          • Section 1 Work
                                                                                            • Integrate Language Arts
                                                                                            • Applying Math Work
                                                                                            • MiniLAB Calculating Your Work and Power
                                                                                            • Applying Math Power
                                                                                              • Section 2 Using Machines
                                                                                                • MiniLAB Machines Multiplying Force
                                                                                                • Science Online
                                                                                                • Integrate Chemistry
                                                                                                  • Section 3 Simple Machines
                                                                                                    • Integrate History
                                                                                                    • Visualizing Levers in the Human Body
                                                                                                    • Science Online
                                                                                                    • Lab Levers
                                                                                                    • Lab Model and Invent - Using Simple Machines
                                                                                                    • Science and Society The Science of Very Very Small
                                                                                                      • Chapter 6 Study Guide
                                                                                                      • Chapter 6 Review
                                                                                                      • Chapter 6 Standardized Test Practice
                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                          • Launch Lab Relative Sizes of Earth the Moon and the Sun
                                                                                                          • Foldables
                                                                                                          • Section 1 Earth in Space
                                                                                                            • Science Online
                                                                                                            • Integrate Physics
                                                                                                              • Section 2 Time and Seasons
                                                                                                                • MiniLAB Modeling the Suns Rays at Solstice
                                                                                                                • Lab Comparing the Angle of Sunlight to Intensity
                                                                                                                  • Section 3 Earths Moon
                                                                                                                    • Applying Math Tides
                                                                                                                    • MiniLAB Modeling Phases and Eclipses
                                                                                                                    • Integrate History
                                                                                                                    • Integrate History
                                                                                                                    • Science Online
                                                                                                                    • Visualizing Water on the Moon
                                                                                                                    • Lab Identifying the Moons Surface Features and Apollo Landing Sites
                                                                                                                    • Oops Accidents in Science Even Great Scientists Make Mistakes
                                                                                                                      • Chapter 7 Study Guide
                                                                                                                      • Chapter 7 Review
                                                                                                                      • Chapter 7 Standardized Test Practice
                                                                                                                        • Chapter 8 The Solar System
                                                                                                                          • Launch Lab The Size of the Solar System
                                                                                                                          • Foldables
                                                                                                                          • Section 1 Planet Motion
                                                                                                                            • Integrate History
                                                                                                                            • MiniLAB Plotting Retrograde Motion
                                                                                                                            • Integrate Physics
                                                                                                                            • Applying Math Heliocentric Longitude (HL)
                                                                                                                              • Section 2 The Inner Planets
                                                                                                                                • Science Online
                                                                                                                                • Integrate Chemistry
                                                                                                                                • Lab Interpreting Features of Marss Surface
                                                                                                                                  • Section 3 The Outer Planets
                                                                                                                                    • Integrate Language Arts
                                                                                                                                    • Visualizing What Galileo Saw
                                                                                                                                    • Science Online
                                                                                                                                    • MiniLAB Comparing Sizes of Outer and Inner Planets
                                                                                                                                      • Section 4 Life in the Solar System
                                                                                                                                        • Lab Design Your Own - Testing Unknown Soil Samples for Life
                                                                                                                                        • Science Stats Night Sky Wonders
                                                                                                                                          • Chapter 8 Study Guide
                                                                                                                                          • Chapter 8 Review
                                                                                                                                          • Chapter 8 Standardized Test Practice
                                                                                                                                              • Unit 3 Energy in Motion
                                                                                                                                                • Chapter 9 Heat and States of Matter
                                                                                                                                                  • Launch Lab Expansion of a Gas
                                                                                                                                                  • Foldables
                                                                                                                                                  • Section 1 Temperature and Thermal Energy
                                                                                                                                                    • Applying Math Converting to Celsius
                                                                                                                                                    • Science Online
                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                    • Applying Math Change in Thermal Energy
                                                                                                                                                      • Section 2 States of Matter
                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                        • Science Online
                                                                                                                                                        • MiniLAB Comparing States of Water
                                                                                                                                                          • Section 3 Transferring Thermal Energy
                                                                                                                                                            • MiniLAB Comparing Thermal Conductors
                                                                                                                                                            • Visualizing Convection Currents
                                                                                                                                                            • Lab Convection in Gases and Liquids
                                                                                                                                                              • Section 4 Using Thermal Energy
                                                                                                                                                                • Integrate History
                                                                                                                                                                • Science Online
                                                                                                                                                                • Lab Conduction in Gases
                                                                                                                                                                • Science Stats Surprising Thermal Energy
                                                                                                                                                                  • Chapter 9 Study Guide
                                                                                                                                                                  • Chapter 9 Review
                                                                                                                                                                  • Chapter 9 Standardized Test Practice
                                                                                                                                                                    • Chapter 10 Waves
                                                                                                                                                                      • Launch Lab How do waves transfer energy
                                                                                                                                                                      • Foldables
                                                                                                                                                                      • Section 1 The Nature of Waves
                                                                                                                                                                        • Visualizing Formation of Ocean Waves
                                                                                                                                                                        • Science Online
                                                                                                                                                                          • Section 2 Wave Properties
                                                                                                                                                                            • MiniLAB Observing Wavelength
                                                                                                                                                                            • Integrate Social Studies
                                                                                                                                                                            • Applying Math The Speed of Sound
                                                                                                                                                                            • Lab Wave Speed and Tension
                                                                                                                                                                              • Section 3 The Behavior of Waves
                                                                                                                                                                                • Science Online
                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                • MiniLAB Experimenting with Resonance
                                                                                                                                                                                • Lab Measuring Wave Properties
                                                                                                                                                                                • Science and History Making Waves
                                                                                                                                                                                  • Chapter 10 Study Guide
                                                                                                                                                                                  • Chapter 10 Review
                                                                                                                                                                                  • Chapter 10 Standardized Test Practice
                                                                                                                                                                                    • Chapter 11 Sound and Light
                                                                                                                                                                                      • Launch Lab What sound does a ruler make
                                                                                                                                                                                      • Foldables
                                                                                                                                                                                      • Section 1 Sound
                                                                                                                                                                                        • MiniLAB Comparing Intensity
                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                        • Science Online
                                                                                                                                                                                        • Applying Math Using Sonar
                                                                                                                                                                                          • Section 2 Reflection and Refraction of Light
                                                                                                                                                                                          • Section 3 Mirrors Lenses and the Eye
                                                                                                                                                                                            • Visualizing Images Formed by a Convex Lens
                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                            • MiniLAB Experimenting with Focal Lengths
                                                                                                                                                                                            • Lab Reflections of Reflections
                                                                                                                                                                                              • Section 4 Light and Color
                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Lab Design Your Own - Blocking Noise Pollution
                                                                                                                                                                                                • Science and Language Arts A Haiku Garden The Four Seasons in Poems and Print
                                                                                                                                                                                                  • Chapter 11 Study Guide
                                                                                                                                                                                                  • Chapter 11 Review
                                                                                                                                                                                                  • Chapter 11 Standardized Test Practice
                                                                                                                                                                                                    • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                      • Launch Lab Global Jigsaw Puzzle
                                                                                                                                                                                                      • Foldables
                                                                                                                                                                                                      • Section 1 Evolution of Earths Crust
                                                                                                                                                                                                        • Applying Math Spreading Distances
                                                                                                                                                                                                        • Integrate Physics
                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                          • Section 2 Earthquakes
                                                                                                                                                                                                            • MiniLAB Demonstrating Four Types of Stress
                                                                                                                                                                                                            • Visualizing Earthquake-Proof Buildings
                                                                                                                                                                                                              • Section 3 Earths Interior
                                                                                                                                                                                                              • Section 4 Volcanoes
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • MiniLAB Modeling Lava Viscosity
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                • Lab A Case for Pacific Plate Motion
                                                                                                                                                                                                                • Lab Earthquake Earthquake Wheres the earthquake
                                                                                                                                                                                                                • Science and History Volcano Weather
                                                                                                                                                                                                                  • Chapter 12 Study Guide
                                                                                                                                                                                                                  • Chapter 12 Review
                                                                                                                                                                                                                  • Chapter 12 Standardized Test Practice
                                                                                                                                                                                                                      • Unit 4 Forms of Energy
                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                          • Launch Lab Electric Circuits
                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                          • Section 1 Electric Charge
                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                            • Visualizing Lightning
                                                                                                                                                                                                                            • MiniLAB Investigate Charged Objects
                                                                                                                                                                                                                              • Section 2 Electric Current
                                                                                                                                                                                                                                • MiniLAB Investigating Battery Addition
                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                • Lab Identifying Conductors and Insulators
                                                                                                                                                                                                                                  • Section 3 Electrical Energy
                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                    • Applying Math Power Used by a Clothes Dryer
                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                    • Applying Math Electrical Energy Used by a Microwave Oven
                                                                                                                                                                                                                                    • Lab Design Your Own - Comparing Series and Parallel Circuits
                                                                                                                                                                                                                                    • Science and Language Arts Invisible Man
                                                                                                                                                                                                                                      • Chapter 13 Study Guide
                                                                                                                                                                                                                                      • Chapter 13 Review
                                                                                                                                                                                                                                      • Chapter 13 Standardized Test Practice
                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                          • Launch Lab The Strength of Magnets
                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                          • Section 1 Magnetism
                                                                                                                                                                                                                                            • MiniLAB Observing Magnetic Interference
                                                                                                                                                                                                                                            • Integrate Earth Science
                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                            • Applying Science How can magnetic parts of a junk car be salvaged
                                                                                                                                                                                                                                            • MiniLAB Making Your Own Compass
                                                                                                                                                                                                                                              • Section 2 Electricity and Magnetism
                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                  • Section 3 Producing Electric Current
                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                    • Visualizing Motors and Generators
                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                    • Lab Electricity and Magnetism
                                                                                                                                                                                                                                                    • Lab Design Your Own - Controlling Electromagnets
                                                                                                                                                                                                                                                    • Science and History Body Art
                                                                                                                                                                                                                                                      • Chapter 14 Study Guide
                                                                                                                                                                                                                                                      • Chapter 14 Review
                                                                                                                                                                                                                                                      • Chapter 14 Standardized Test Practice
                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                          • Launch Lab Can electromagnetic waves change materials
                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                          • Section 1 What are electromagnetic waves
                                                                                                                                                                                                                                                            • MiniLAB Investigating Electromagnetic Waves
                                                                                                                                                                                                                                                            • Applying Math The Speed of Light in Water
                                                                                                                                                                                                                                                              • Section 2 The Electromagnetic Spectrum
                                                                                                                                                                                                                                                                • MiniLAB Heating with Microwaves
                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                • Lab The Shape of Satellite Dishes
                                                                                                                                                                                                                                                                  • Section 3 Radio Communication
                                                                                                                                                                                                                                                                    • Visualizing Radio Broadcasts
                                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Lab Use the Internet - Radio Frequencies
                                                                                                                                                                                                                                                                    • Science and History Riding a Beam of Light
                                                                                                                                                                                                                                                                      • Chapter 15 Study Guide
                                                                                                                                                                                                                                                                      • Chapter 15 Review
                                                                                                                                                                                                                                                                      • Chapter 15 Standardized Test Practice
                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                          • Launch Lab Heating with Solar Energy
                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                          • Section 1 Fossil Fuels
                                                                                                                                                                                                                                                                            • Visualizing The Formation of Fossil Fuels
                                                                                                                                                                                                                                                                            • MiniLAB Designing an Efficient Water Heater
                                                                                                                                                                                                                                                                              • Section 2 Nuclear Energy
                                                                                                                                                                                                                                                                                • Integrate Earth Science
                                                                                                                                                                                                                                                                                • Integrate Social Science
                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                • Applying Science Can a contaminated radioactive site be reclaimed
                                                                                                                                                                                                                                                                                  • Section 3 Renewable Energy Sources
                                                                                                                                                                                                                                                                                    • MiniLAB Using Solar Power at Home
                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                    • Lab Solar Heating
                                                                                                                                                                                                                                                                                    • Lab Use the Internet How much does energy really cost
                                                                                                                                                                                                                                                                                    • Science and Society Reacting to Nuclear Energy
                                                                                                                                                                                                                                                                                      • Chapter 16 Study Guide
                                                                                                                                                                                                                                                                                      • Chapter 16 Review
                                                                                                                                                                                                                                                                                      • Chapter 16 Standardized Test Practice
                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                          • Lab Atmospheric Pressure
                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                          • Section 1 Earths Atmosphere
                                                                                                                                                                                                                                                                                            • MiniLAB Visualizing Convection
                                                                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                                                                            • Lab Visualizing a Temperature Inversion
                                                                                                                                                                                                                                                                                              • Section 2 Weather
                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Coriolis Effect
                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                  • Section 3 Climate
                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                    • Visualizing Earths Biogeophysical System
                                                                                                                                                                                                                                                                                                      • Section 4 Earths Changing Climates
                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                        • Applying Math Carbon Dioxide (CO2) Concentration
                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Investigating Microclimate
                                                                                                                                                                                                                                                                                                        • Science and Language Arts The Grapes of Wrath
                                                                                                                                                                                                                                                                                                          • Chapter 17 Study Guide
                                                                                                                                                                                                                                                                                                          • Chapter 17 Review
                                                                                                                                                                                                                                                                                                          • Chapter 17 Standardized Test Practice
                                                                                                                                                                                                                                                                                                              • Unit 5 Matter and Earth Materials
                                                                                                                                                                                                                                                                                                                • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                  • Launch Lab Demonstrate the Distillation of Water
                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                  • Section 1 Composition of Matter
                                                                                                                                                                                                                                                                                                                    • Visualizing Elements
                                                                                                                                                                                                                                                                                                                    • MiniLAB Classifying Materials
                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                    • Lab Comparing Pure Substances and Mixtures
                                                                                                                                                                                                                                                                                                                      • Section 2 Properties of Matter
                                                                                                                                                                                                                                                                                                                        • Integrate Environment
                                                                                                                                                                                                                                                                                                                        • MiniLAB Separating Ink
                                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                                        • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                        • Applying Math The Law of Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Measuring the Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Science Stats Intriguing Elements
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Study Guide
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Review
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                            • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                              • Launch Lab Inferring What You Cant Observe
                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                              • Section 1 Structure of the Atom
                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling an Aluminum Atom
                                                                                                                                                                                                                                                                                                                                • Visualizing The Atomic Model
                                                                                                                                                                                                                                                                                                                                  • Section 2 Masses of Atoms
                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                    • Applying Science How can radioactive isotopes help tell time
                                                                                                                                                                                                                                                                                                                                      • Section 3 The Periodic Table
                                                                                                                                                                                                                                                                                                                                        • MiniLAB Organizing a Personal Periodic Table
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Career
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                                                                                                                                                                        • Lab A Periodic Table of Foods
                                                                                                                                                                                                                                                                                                                                        • Lab Use the Internet Whats in a name
                                                                                                                                                                                                                                                                                                                                        • Science and History A Chilling Story
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Study Guide
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Review
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                            • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                              • Launch Lab Earth Materials at Home and School
                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                              • Section 1 Minerals
                                                                                                                                                                                                                                                                                                                                                • MiniLAB Identifying Salts Crystal System
                                                                                                                                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                • Lab Be a Mineral Detective
                                                                                                                                                                                                                                                                                                                                                  • Section 2 Igneous Rocks
                                                                                                                                                                                                                                                                                                                                                    • Applying Math Extrusive Igneous Rock Classification
                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                      • Section 3 Sedimentary Rocks
                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Evaporites
                                                                                                                                                                                                                                                                                                                                                          • Section 4 Metamorphic Rocks and the Rock Cycle
                                                                                                                                                                                                                                                                                                                                                            • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                            • Visualizing Shock Metamorphic Rock
                                                                                                                                                                                                                                                                                                                                                            • Lab Identifying Rocks
                                                                                                                                                                                                                                                                                                                                                            • Science and Society Earth Materials at Work
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Study Guide
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Review
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                  • Launch Lab Have you got the time
                                                                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                                                                  • Section 1 Weathering and Soil
                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing a Disappearing Seasoning
                                                                                                                                                                                                                                                                                                                                                                    • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                    • Lab Graphing Soil Textures
                                                                                                                                                                                                                                                                                                                                                                      • Section 2 Shaping the Landscape
                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Runoff
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                          • Section 3 Groundwater
                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Porosity Volume
                                                                                                                                                                                                                                                                                                                                                                            • Visualizing The Role of Groundwater in Shaping Earths Surface
                                                                                                                                                                                                                                                                                                                                                                            • Integrate Environment
                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                              • Section 4 Geologic Time
                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                                                                                                • Lab Its about time - relative that is
                                                                                                                                                                                                                                                                                                                                                                                • Science and Society Tapping into the Underground
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Review
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                      • Unit 6 Interactions of Matter
                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                          • Lab Chemical Bonds and Mixing
                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Stability in Bonding
                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                            • Lab Atomic Trading Cards
                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Types of Bonds
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Observing a Bond Type
                                                                                                                                                                                                                                                                                                                                                                                                • Visualizing Polar Molecules
                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Writing Formulas and Naming Compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math Determining a Formula
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Science Can you name binary ionic compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Making a Hydrate
                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Model and Invent - Modeling Chemical Bonding
                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Sticky Subject
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Review
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab RustingmdashA Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Chemical Changes
                                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Designing a Team Equation
                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Chemical Equations
                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math Barium Sulfate Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Classifying Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 4 Reaction Rates and Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing Chemical Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Creating a Colorful Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab To Glow or Not to Glow
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Investigating Reaction Conditions
                                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Clumsy Move Pays Off
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Study Guide
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                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab Magic Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 How Solutions Form
                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                                                                                                                                                                                                                                                            • Visualizing Metal Alloys
                                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Observing the Effect of Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Solubility and Concentration
                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Acids Bases and Salts
                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing Acid Relief
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Strength of Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Determining Acidity
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Saturated Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and Society Acid Rain
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Study Guide
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                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab The Size of a Nucleus
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Strong Force
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Nuclear Decay
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Detecting Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math The Age of Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Social Studies
                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Nuclear Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling a Nuclear Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Visualizing PET Scans
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Chain Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Model and Invent Modeling Transmutations
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and History The Nuclear Alchemist
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Study Guide
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                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 26 Stars and Galaxies
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab Stars in the Sky
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                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Observing the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling a Telescope
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math The Magnifying Power of Telescopes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Evolution of Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Counting Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing H-R Diagrams of Star Clusters
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Star Cluster Age
                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 3 Galaxies and the Milky Way
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Science and Language Arts Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Study Guide
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 12 Earths Internal Processes
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Page 17: 706 S1 318-326 GPS09 - Light-and-Sound - home · PDF fileWhat sound does a ruler make? ... sound waves cannot travel in empty space where there are no particles. ... sound travels

Figure 19

VISUALIZING IMAGES FORMED BY A CONVEX LENS

334 CHAPTER 11 Sound and Light

Aconvex lens can form images that are real or virtual enlarged or reduced and upright orinverted Just as for a concave mirror the type of image formed by a convex lens depends on thelocation of the object relative to the focal point of the lens

Optical axis

One

focal

length

Two

focal

lengthsRay B

Image

Ray A

Object

Focal

point

Optical axis

One

focal

length

Two

focal

lengths

Ray B

Ray AObject

Image

Focal

point

Optical axis

Ray B

ObjectRay A

One

focal

length

Focal

pointImage

If the object is more than two focal lengths from the lens the image formed is real inverted andsmaller than the object As the object moves farther from the lens the image becomes smaller

If the object is between one and two focal lengths from the lens the image formed is real invertedand larger than the object As the object moves closer to the focal point the image becomes larger

If the object is less than one focal length from the lens the image is virtual upright and larger thanthe object The image is virtual because the light rays from the object diverge after they pass throughthe lens The image becomes smaller as the object moves closer to the lens

SECTION 3 Mirrors Lenses and the Eye 335

Concave Lenses A concave lens is thinnerin the middle and thicker at the edges Asshown in Figure 20 light rays that passthrough a concave lens bend away from theoptical axis The rays spread out and nevermeet so a real image is never formed Theimage is always virtual upright and smallerthan the object is Concave lenses are used insome types of eyeglasses and some telescopesConcave lenses usually are used in combinationwith other lenses

What type of image is formed by a concave lens

The Human EyeWhat determines how well you can see the words on this

page If you donrsquot need eyeglasses the structure of your eye givesyou the ability to focus on these words and other objects aroundyou Look at Figure 21 Light enters your eye through a trans-parent covering on your eyeball called the cornea The corneacauses light rays to bend so that they converge The light thenpasses through an opening called the pupil Behind the pupil isa flexible convex lens Muscles attached to the lens change itsshape to help focus light forming a sharp image on your retina

The retina is the inner lining of your eye The retina con-tains light-sensitive cells that convert an image into electricalsignals These signals then are carried along the optic nerve toyour brain to be interpreted With this complex structurethe human eye is capable of seeing clearly in bright and dimconditions focusing on both near and far objects and alsodetecting colors

Figure 20 A concave lens

refracts light rays so they spread

out away from the optical axis

Classify Is a concave lens mostlike a concave mirror or a convexmirror

Optical axis

Retina

Focalpoint

Pupil

Cornea

Lens

Optic nerve

Figure 21 The cornea and lens in your eye

bend light rays so that a sharp image is

formed on the retina

Eye Doctors Optometristsand ophthalmologists treatmany different eye prob-lems They often useadvanced technology todiagnose and correct mal-functioning parts of theeye Research an eye prob-lem and how it is treatedWrite a paragraph describ-ing what parts of the eyeare affected by the problemand how doctors correct it

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336 CHAPTER 11 Sound and Light

Brightness and Intensity The human eye can adjust to thebrightness of the light that strikes it If you step outside on asunny day you may have to shade your eyes against the intensityof the sunlight Light intensity is the amount of light energy thatstrikes a certain area each second Brightness is the human per-ception of light intensity Sunlight seems bright because a largeamount of light energy strikes your retina each second Youreyes respond to bright light by decreasing the size of your pupilThis reduces the amount of light that enters your eye and strikesthe retina

Intensity depends on your distance from a light source Ifyou move away from a bare lightbulb you can see how theintensity of the light rapidly decreases Because light rays spreadout from the source less light energy strikes your retina thefarther away you are from the bulb

Correcting Vision ProblemsIf you have good vision you should be able to see objects

clearly when they are 25 cm or farther away from your eyes Asharp image of an object should be formed on your retinaHowever for many people the image is blurry or formed in thewrong place causing vision problems

Farsightedness If you can see distant objects clearly butcanrsquot bring nearby objects into focus then you are farsighted Inthis case the eyeball might be too short or the lens isnrsquot curvedenough to form a sharp image of nearby objects on the retinaas shown in Figure 22 To correct the problem convex lensescan be used to bend incoming light rays so they converge beforethey enter the eye

Experimenting withFocal LengthsProcedure1 Complete the safety form

2 Fill a glass test tube with

water and seal it with a

lid or stopper3 Type or print SULFUR

DIOXIDE in capital letters

on a piece of paper4 Set the test tube horizon-

tally over the words

Record your observations

5 Hold the tube at several

heights above the words

Record your observations

Analysis1 Describe how the words

changed as the height of

the test tube increased

2 Classify the image at each

height as real or virtual

Focal

point

Correctedfarsighted eye

Light fromnearby object

Focalpoint

Light fromnearby object

Farsighted eye

The focal length of a farsighted eye is too long to form

a sharp image of nearby objects on the retina

A convex lens in front of a farsighted eye enables a sharp

image of nearby objects to be formed on the retina

Figure 22 Farsightedness can

be corrected by convex lenses

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SECTION 3 Mirrors Lenses and the Eye 337

Self Check

1 Diagram how light rays from an object are reflected by

a convex mirror to form an image

2 Infer how the size of the image changes if an object

that is less than one focal length from a concave mirror

moves closer to the mirror

3 Explain how the focal length of a convex lens changes

as the sides of the lens become less curved

4 Compare the image of an object less than one focal

length from a convex lens with the image of an object

more than two focal lengths from the lens

5 Think Critically Describe the image formed by a light

source placed at the focal point of a convex lens

Summary

Mirrors

bull A plane mirror forms upright virtual images

bull The image formed by a concave mirror

depends on the location of the object relative

to the focal point

bull Convex mirrors always produce virtual upright

images that are smaller than the object

Lenses

bull The image formed by a convex lens depends

on the distance of the object from the lens

bull Concave lenses always form virtual upright

images that are smaller than the object

The Eye and Vision

bull The eye contains a lens that changes shape to

produce sharp images on the retina

bull Farsightedness occurs when the eye cannot

form a sharp image of nearby objects

Nearsightedness occurs when the eye cannot

form sharp images of distant objects

6 Calculate Object Distance If you looked through a

convex lens with a focal length of 15 cm and saw a

real inverted enlarged image what is the maximum

distance between the lens and the object

Nearsightedness If you have nearsighted friends you knowthat they can see only nearby objects clearly Their eyes cannotform a sharp image on the retina of an object that is far awayInstead the image is formed in front of the retina as shown inFigure 23 To correct this problem a nearsighted person canwear concave lenses Figure 23 shows how a concave lens causesincoming light rays from distant objects to diverge before theyreach the eye Then the rays can be focused by the eye to form asharp image on the retina

Figure 23 Nearsightedness can

be corrected with concave lenses

Focalpoint

Light fromdistant object

Nearsighted eye

Focalpoint

Light fromdistant object

Correctednearsighted eye

When a nearsighted person looks at distant objects a

sharp image is formed in front of the retina

A concave lens in front of a nearsighted eye makes light

rays diverge so a sharp image is formed on the retina

More Section Review gpesciencecom

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How can you see the back of your head You

can use two mirrors to view a reflection of a

reflection of the back of your head

Real-World ProblemHow many images are seen in two mirrors

Goal Infer how the number of images depends

on the angle between two mirrors

Materialsplane mirrors (2) protractor

masking tape paper clip

Safety Precautions

Handle glass mirrors and paper clips carefully

Procedure1 Complete the safety form

2 Lay one mirror on top of the other with the

mirror surfaces together Tape together one

side so they can open and close Use tape to

label them L and R for left and right

3 Open the mirrors and stand them on a sheet

of paper at an angle of 72deg

4 Bend one leg of a paper clip up 90deg and

place it close to the front of the R mirror

5 Count the number of images of the paper

clip you see in the R and L mirrors Record

these numbers in your data table

6 The mirrors create an image of a circle

divided into wedges Record the number

of wedges

7 Hold the R mirror still and slowly move the Lmirror to 90deg Record the numbers of images

of the clip and wedges in the circle Repeat

this time opening the mirrors to 120deg

Conclude and Apply1 Infer the relationship between the number

of wedges and paper clip images

2 Determine the angle that would divide a

circle into six wedges Hypothesize how

many images would be produced Test your

hypothesis

Reflections of Reflections

Demonstrate for younger students the

relationship between the angle of the

mirrors and the number of reflections

338 CHAPTER 11 Sound and Light

Angle

Number of Number

of Mirrors Paper Clip Images

of Wedges R L

72ordm

90ordm

120ordm

Images and Wedges Seen in the Mirrors

Do not write in this book

SECTION 4 Light and Color 339

Why Objects Have ColorWhy do some apples appear red while others look green or

yellow An objectrsquos color depends on the wavelengths of light itreflects Recall that white light is a blend of all colors of visiblelight When a red apple is struck by white light it reflects redlight back to your eyes and absorbs all of the other colorsFigure 24 shows white light striking a green leaf Only the wave-lengths corresponding to green light are reflected to your eyes

Although some objects appear to be black black isnrsquot acolor Black is the absence of visible light Objects that appearblack absorb all colors of light and reflect little or no light backto your eyes White objects appear to be white because theyreflect all colors of visible light

Why does a white object appear white

Colored Filters Wearing tinted glasses changesthe color of almost everything you see If the lensesare yellow the world takes on a golden glow If theyare rose colored everything looks rosy Somethingsimilar would occur if you placed a colored clearplastic sheet over this white page The paper wouldappear to be the same color as the plastic The plasticsheet and the tinted lenses are filters A filter is atransparent material that transmits one or more col-ors of light but absorbs all others The color of a fil-ter is the color of the light that it transmits

Light and Color

Reading Guide

Explain how you see color Describe the difference between

light color and pigment color Predict what happens when dif-

ferent colors are mixed

From traffic lights to great works of

art color is an important part of your

world

Review Vocabulary

retina inner layer of the eye con-

taining cells that convert light

images into electrical signals

New Vocabulary

bull pigment

Figure 24 This leaf absorbs all

wavelengths of visible light except

the wavelengths you see as green

GPS+_339

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340 CHAPTER 11 Sound and Light

Looking Through Colored Filters Figure 25 shows howthe color of an object can change when you look at it throughvarious colored filters The cooler looks blue under white lightbecause it reflects only the wavelengths of blue light that strikeit If you look at the cooler through a blue filter the cooler stilllooks blue because the blue filter transmits the reflected bluelight However if you look at the cooler through a red filter thecooler seems black because the red filter blocks the blue lightreflected by the cooler

Why does a blue object appear black whenviewed through a red filter

Seeing ColorAs you approach a busy intersection the color of the traffic

light changes from green to yellow to red On the cross street thecolor changes from red to green At a busy intersection trafficsafety depends on your ability to detect color changes rapidlyHow do you see colors

Light and the Eye In a healthy eye light enters the eyethrough the cornea is focused by the lens and finally forms animage on the retina The retina is made up of two types of cellsthat absorb light as shown in Figure 26 When these cellsabsorb light energy chemical reactions convert light energy intonerve impulses that are transmitted to the brain One type ofcell in the retina called a cone enables you to distinguish colorsand detailed shapes of objects Cones need bright light to gener-ate nerve impulses so they do not operate in dim light As aresult even brightly colored objects might look gray or black indim light

Figure 25 The color of this

cooler changes when viewed

through different color filters

Topic Color BlindnessVisit for Web

links to information about the

causes of color blindness

Activity Research the causes

and types of color blindness Find

out how cones are related to the

ability to distinguish colors

gpesciencecom

GPS+_340

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SECTION 4 Light and Color 341

Cones and Rods Your eyes have three types of cones each ofwhich responds to a different range of wavelengths Red conesrespond to mostly red and yellow light Green cones respond tomostly yellow and green light Blue cones respond to mostlyblue and violet light The second type of cell in the retina calleda rod is sensitive to dim light and enables you to see at nightHowever rod cells do not enable you to see colors

Interpreting Color Why does a bananalook yellow The light reflected by the

banana causes the cone cells that are sensitive to red and greenlight to send signals to your brain Your brain could get the samesignal if a mixture of red light and green light reached your eyesThis mixture also would cause your red and green cones torespond and you would see the color yellow As a result lightwith wavelengths corresponding to yellow light and light that isa mixture of red and green light both cause the color yellow tobe seen What happens when you look at a white shirt You seewhite when all wavelengths of visible light enters your eyes Thenall three sets of cones cells send signals to the brain The com-bination of these signals cause you to see the shirt as white

Color Blindness If one or more of your sets of cone cellsdo not function properly you might not be able to distinguishcertain colors This condition is called color blindness orcolor deficiency About eight percent of men and one-halfpercent of women have some form of color blindness Themost common form of color blindness makes it difficult todistinguish between red and green Figure 27 shows an imagethat is used in a test for redndashgreen color blindness Becausered and green are used in traffic signals drivers and pedestri-ans must be able to identify them

Retina

Rod

Cone

Lens

Figure 27 Color blindness is an

inherited sex-linked condition in

which certain sets of cones in the

retina do not function properly

Identify the number that you seein the dots

Figure 26 Light enters the eye

and focuses on the retina The two

types of light-detecting cells

that make up the retina

are called rods and cones

GPS+_341

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342 CHAPTER 11 Sound and Light

Mixing ColorsIf you have ever browsed through a paint store you have

probably seen displays where customers can select paint samplesof almost every imaginable color The colors are a result of mix-tures of pigments For example you might have mixed blue andyellow paint to produce green paint A pigment is a coloredmaterial that is used to change the color of other substancesThe color of a pigment results from the different wavelengths oflight that the pigment reflects

Mixing Colored Lights From the glowing orange of a sun-set to the deep blue of a mountain lake all the colors you see canbe made by mixing three colors of light These three colorsmdashred green and bluemdashare the primary colors of light They cor-respond to the three different types of cones in the retina ofyour eye When mixed together in equal amounts they producewhite light as Figure 28 shows Mixing the primary colors indifferent proportions can produce the colors you see

What are the primary colors of light

Paint Pigments If you were to mix equal amounts of redgreen and blue paint would you get white paint If mixing col-ors of paint were like mixing colors of light you would but mix-ing paint is different Paints are made with pigments Pigmentsproduce color as a result of the wavelengths of light they reflectPaint pigments usually are made of chemical compounds suchas titanium oxide a bright white pigment and lead chromatewhich is used for painting yellow lines on highways

Figure 28 White light is pro-

duced when the three primary col-

ors of light are mixed in equal

amounts

Color for PhotosynthesisPlant pigments determinethe wavelengths oflight for photosynthesisLeaves usually look greenbecause of the pigmentchlorophyll Chlorophyllabsorbs most wave-lengths of visible lightexcept green which itreflects However not allplants are green Researchdifferent plant pigmentsto find out how they allowplant species to survive indiverse habitats

GPS+_342

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SECTION 4 Light and Color 343

Self Check

1 Identity what colors are reflected and what colors are

absorbed if a white light shines on a red shirt

2 Discuss how the primary colors of light differ from the

primary pigment colors

3 Explain why a red apple would appear black if you

looked at it through a blue filter

4 Determine why a white fence appears to be white instead

of multicolored if all colors are present in white light

5 Think Critically Light reflected from an object passes

through a green filter then a red filter and finally a

blue filter What color will the object seem to be

Summary

Why Objects Have Color

bull The color of an object is determined by the

wavelengths of light it reflects

bull The color of a filter is the color of the light the

filter transmits

Seeing Color

bull Rod and cone cells are light-sensitive cells

found in the retina of the human eye

bull Rod cells are sensitive to dim light Cone cells

enable colors to be seen

bull There are three types of cone cells One type

responds to red light another to green light

and another to blue light

Mixing Colors

bull Red green and blue are the primary light

colors Any color of light can be created by

mixing these primary light colors

bull Any pigment color can be formed by mixing

the primary pigment colorsmdashmagenta cyan

and yellow

6 Use Percentages In the human eye there are about

120000000 rods If 90000000 rods trigger at once

what percentage of the total number of rods triggered

7 Convert Units The wavelengths of light are measured

in nanometers (nm) which equals 0000001 mm

Find the wavelength in mm of a light wave that has a

wavelength of 690 nm

Mixing Pigments You can make any pigment color by mixingdifferent amounts of the three primary pigmentsmdashmagenta(bluish red) cyan (greenish blue) and yellow In fact color print-ers use these pigments as well as black ink to make full-colorprints like the pages in this book A primary pigmentrsquos colordepends on the wavelengths of the light that it reflects Actuallypigments both absorb and reflect a range of colors in sending asingle color message to your eye For example in white lightyellow pigment appears yellow because it reflects red and greenlight but absorbs the other wavelengths of visible light The colorof a mixture of two primary pigments is determined by theprimary colors of light that both pigments reflect

Look at Figure 29 The area in the center where the colors alloverlap appears to be black because the three blended primarypigments absorb all the primary colors of light Recall that theprimary colors of light combine to produce white light They arecalled additive colors However when the primary pigment col-ors are combined they absorb all wavelengths of visible light andproduce black Because black results from the absence ofreflected light the primary pigments are called subtractive colors

Figure 29 The three primary

pigment colors appear to be black

when they are mixed

Describe how the primary pigmentcolors are similar to the primary col-ors of light

More Section Review gpesciencecom

GPS+_343

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7230715

eng - iTunNORM 000002A9 00000000 00001B2C 00000000 0000E3C1 00000000 00006099 00000000 00004705 00000000

Design Your OwnDesign Your Own

344

Real-World ProblemWhat loud noises do you enjoy and which ones do you find annoying

Most people enjoy a music concert performed by their favorite artist or

the booming displays of fireworks on the Fourth of July Most people

enjoy these loud sounds for short periods of time However certain

other loud noises such as traffic sirens and loud talking can be

annoying Constant annoying noises are called noise pollution What

can be done to reduce noise pollution What types of barriers will best

block out noise pollution

Form a HypothesisBased on your experiences with loud noises form a hypothesis that

predicts the effectiveness of different types of barriers at blocking out

noise pollution

Test Your HypothesisMake a Plan

1 Complete the safety form

2 Decide what type of barriers or materials you will test

3 Describe exactly how you will use these materials

Goals Design an experiment

that tests the effective-

ness of various types of

barriers and materials

for blocking out noise

pollution

Test different types of

materials and barriers

to determine the best

noise blocks

Possible Materialsradio CD player horn

drum or other loud

noise source

shrubs trees concrete

walls brick walls stone

walls wooden fences

parked cars or hanging

laundry

sound meter

meterstick or metric tape

measure

Blocking NfisePollution

4 Identify the controls and variables you will use in your

experiment

5 List the steps you will use and describe each step precisely

6 Prepare a data table in your Science Journal to record your

measurements

7 Organize the steps of your experiment in logical order

Follow Your Plan

1 Ask your teacher to approve your plan and data table before

you start

2 Conduct your experiment as planned

3 Test each barrier two or three times

4 Record the results from each test in your data table in your Science Journal

Analyze Your Data1 Identify the barriers that most effectively reduced noise pollution

2 Identify the barriers that least effectively reduced noise pollution

3 Compare the effective barriers and identify common characteristics that might

explain why they reduced noise pollution

4 Compare the natural barriers you tested with the artificial barriers Which type

of barrier best reduced noise pollution

5 Compare the different types of materials the barriers were made of Which

type of material best reduced noise pollution

Conclude and Apply1 Evaluate whether your results support your hypothesis

2 Predict how your results would differ if you used a louder source of noise such

as a siren

3 Infer from your results how people living near a

busy street could reduce noise pollution

4 Identify major sources of noise pollution in or

near your home How could they be reduced

5 Research how noise pollution can be

unhealthy

LAB 345

Draw a poster illustrating how builders and

landscapers could use certain materials to

better insulate a home or office from excess

noise pollution

346 CHAPTER 11 Sound and Light

A Haiku GardenThe Four Seasons in Poems and Prints

by Stephen Addiss with Fumiko and Akira Yamamoto

Respond to the Reading1 How do the illustrations help the reader

better understand the poems2 What do you think is meant by the

word lingering in the Haiku about springsunlight

3 Linking Science and Writing Writeone haiku about summer and anotherabout fall In one poem use color tohelp you describe the season In theother use light or some property oflight to help describe the season

Research has deter-mined that there is a

connection between color and mood Warmcolors have longer wavelengths and can bemore stimulating Cool colors which haveshorter wavelengths tend to have a calmingor soothing effect on people Light and colorhave long been used as literary symbols Doesthe use of color change what you imaginewhen you read the haiku

UnderstandingLiteratureJapanese Haiku A haiku is a verse thatconsists of three lines and 17 syllables inthe Japanese language The first and thirdlines have five syllables each and themiddle line has seven syllables Why isimagination important in reading haiku

Lingering

in every pool of watermdash

spring sunlightIssa

Withered by winter

the sound of the windmdash

one-color worldBasho

Sound

1 Sound waves are compressional waves thattravel only in matter

2 The speed of sound in a material dependson the type of material as well as itstemperature

3 Loudness depends on a sound waversquos inten-sity Pitch depends on a sound waversquosfrequency

4 Sound waves are used in echolocationsonar and medical imaging

Reflection and Refractionof Light

1 Light can be absorbed reflected or trans-mitted by a material

2 When light waves are reflected theyobey the law of reflectionmdashthe angle ofincidence equals the angle of reflection

3 A light wave is refracted or bent whenit changes speed as it travels at an anglefrom one material to another

Mirrors Lenses andthe Eye

1 Plane mirrors form upright virtual images

2 Images formed by concave mirrors andconvex lenses depend on the location ofthe object relative to the focal point

3 Convex mirrors and concave lenses formvirtual upright images that are smallerthan the object

4 The lens in the human eye changes shape toproduce a sharp image on the retina

Light and Color

1 You see color when light is reflected offobjects and into your eyes

2 Cone cells in the retina are light-sensitivecells that enable you to distinguish colors

3 Red blue and green are the three primarycolors of light and can be mixed to form allother colors

4 The primary pigment colors are magentacyan and yellow

CHAPTER STUDY GUIDE 347

Use the Foldable you made at the beginningof the chapter to help you review sound and light

Interactive Tutor gpesciencecom

Complete each statement with the correctvocabulary word or phrase

1 A change in frequency due to a movingsound source is due to the

2 A flat smooth surface that reflects light andforms an image is a(n)

3 An object is if you can seethrough it clearly

4 The of a material indicates howmuch the speed of light in the materialchanges as light passes through

5 You can change the color of white paint byadding a(n) to it

6 A(n) is a reflecting surface thatcurves outward like the back of a spoon

7 The human perception of the intensity of asound wave is

Choose the word or phrase that best answerseach question

8 Which of the following best describes imageformation by a plane mirrorA) A real image is formed in front of the mirrorB) A real image is formed behind the mirrorC) A virtual image is formed in front of the

mirrorD) A virtual image is formed behind the mirror

9 For a sound with low pitch what else isalso always lowA) amplitude C) wavelengthB) frequency D) wave velocity

10 Which of the following occurs when asound source moves away from youA) The soundrsquos velocity decreasesB) The soundrsquos loudness increasesC) The soundrsquos frequency decreasesD) The soundrsquos frequency increases

Use the table below to answer question 11

11 Based on the data in the table abovewhich of the following would be the speedof sound in air at 30degCA) 3404 ms C) 3494 msB) 3464 ms D) 3534 ms

12 What happens to a light ray travelingparallel to the optical axis of a convexlens that passes through the lensA) It travels parallel to the optical axisB) It passes through the focal pointC) It is bent away from the optical axisD) It forms a virtual image

13 Light waves of which color are bent mostwhen passing through a prismA) blue C) violetB) red D) yellow

14 Which way does a concave lens bend lightA) toward its optical axisB) toward its centerC) toward its edgesD) toward its focal point

Speed of Sound in Air

Temp peed( s)

4

4

4

348 CHAPTER REVIEW

concave lens p 335concave mirror p 332convex lens p 333convex mirror p 333decibel p 322Doppler effect p 323index of refraction p 329intensity p 322

loudness p 322opaque p 327pigment p 342pitch p 323plane mirror p 331translucent p 327transparent p 327

Vocabulary PuzzleMaker gpesciencecom

Use the illustration below to answer question 15

15 Describe how the position of the candlechanged if the image of the candle movedaway from the focal point

16 Apply Acoustic scientists sometimes doresearch in rooms that absorb all soundwaves How could such a room be used tostudy how bats find their food

17 Compare White light passes through atranslucent pane of glass and shines on ashirt Both the translucent glass and theshirt appear green Compare the colors oflight that are absorbed and transmitted bythe glass and the shirt

18 Infer Most mammals including dogs andcats canrsquot see colors Infer how the retinaof a catrsquos eye might be different from theretina of a human eye

19 Determine whether a convex lens could forman image that is enlarged real and upright

20 Infer A car comes to a railroad crossingThe driver hears a trainrsquos whistle and itspitch becomes lower What can beassumed about how the train is moving

21 Compare and contrast the reflection of lightfrom a white wall with a rough surfacewith the reflection of light from a mirror

Optical axis

One

focal

length

Two

focal

lengths

Image

Ray A

Object

Focal

point

Interpreting Graphics 22 Infer why a convex mirror and a concavelens can never produce a real image

23 Predict what color a white shirt wouldappear to be if the light reflected from theshirt passed through a red filter and thenthrough a green filter

24 Explain why windows might begin to rattlewhen an airplane flies overhead

25 Communicate Some people enjoy usingsnowmobiles Others object to the noisethat they make Write a proposal for a pol-icy that seems fair to both groups for theuse of snowmobiles in a state park

CHAPTER REVIEW 349

Use the wave speed equation ν ƒλ to answer

questions 26 and 27

26 Calculate Frequency A sonar pulse has awavelength of 30 cm and a speed inwater of 1500 ms Find its frequency

27 Calculate Wavelength What is the wave-length of a sound wave with a fre-quency of 440 Hz if the speed of soundin air is 340 ms

28 Calculate Angle of Incidence A light ray isreflected from a mirror If the anglebetween the incident ray and thereflected ray is 136deg what is the angleof incidence

29 Determine Object Distance You hold anobject in front of a concave mirror witha focal length of 30 cm If you do notsee a reflected image how far from themirror is the object

30 Calculate Speed The speed of light in avacuum is 300000 kms If the index ofrefraction of water is 133 what is thespeed of light in water

More Chapter Review gpesciencecom

1 Which of the following describes the imageformed by a convex mirror

A enlarged

B inverted

C real

D virtual

Use the figure below to answer question 2

2 Which of the following describes a light raythat passes through the focal point andthen is reflected by the mirror

A It travels parallel to the optical axis

B It forms a real image

C It is reflected back through the focal point

D It forms a virtual image

3 Why does an apple look red

A It reflects red light

B It absorbs red light

C It reflects green and blue light

D It reflects all colors of light except red

Use the figure below to answer questions 4 and 5

4 When the primary colors of light are addedtogether what color appears in area H

A cyan

B magenta

C white

D yellow

5 When the primary colors of light are addedtogether what color appears in area G

A cyan

B magenta

C white

D yellow

6 Which of the following increases as the fre-quency of a sound increases

A amplitude

B intensity

C loudness

D pitch

Red Blue

Green

F

H

G K

Focal pointOptical axis

350 STANDARDIZED TEST PRACTICE

Record your answers on the answer sheet provided by your teacher or on a sheet of paper

STANDARDIZED TEST PRACTICE 351

7 Which of the following parts of the eyeenable you to see colors in bright light

A cone cells

B cornea

C lens

D rod cells

Use the graph below to answer questions 8 and 9

8 Determine how far in centimeters theimage is from the lens when the object is15 centimeters from the lens

9 How far in centimeters is the object fromthe lens when the image distance andobject distance are equal

10 A shirt has stripes that are black and whitein white light If green light shines on thisshirt what colors will the black and whitestripes be

11 If you are on a moving train what hap-pens to the pitch of a crossing bell as youapproach the crossing and then moveaway from the crossing

Use the figure below to answer question 12

12 Describe the vision problem show by thefigure and explain how this vision prob-lem can be corrected

13 Explain why the human eye can see colorsbetter in bright light than in dim light

Image Distance fora Convex Lens

Ima

ge

dis

tan

ce (

cm)

30

25

20

15

10

5 10 15 20 25 30

Object distance (cm)

Standardized Test Practice gpesciencecom

Note Units Read carefully and make note of the units used in

any measurement

  • Glencoe Physical Science with Earth Science
    • Student Edition Table of Contents
      • Unit 1 Science and Technology
        • Chapter 1 The Nature of Science
          • Launch Lab Understanding Measurements
          • Foldables
          • Section 1 The Methods of Science
            • Science Online
            • Integrate History
            • Integrate Earth Science
            • Science Online
              • Section 2 Standards of Measurement
                • Applying Math Centimeters
                • Integrate Earth Science
                • Science Online
                • MiniLAB Determining the Density of a Pencil
                • Visualizing SI Dimensions
                  • Section 3 Communicating with Graphs
                    • Applying Math Temperature
                    • MiniLAB Graphing Temperature Change
                    • Lab Whats my graph
                    • Lab Design Your Own - Developing a Measurement System
                    • Science and Language Arts Thinking in Pictures and Other Reports from My Life with Autism
                      • Chapter 1 Study Guide
                      • Chapter 1 Review
                      • Chapter 1 Standardized Test Practice
                        • Chapter 2 Science Technology and Society
                          • Lab Technology in Your Life
                          • Foldables
                          • Section 1 Science and Technology
                            • MiniLAB Researching the Past
                            • Visualizing Technology Supplying Basic Needs
                            • Science Online
                              • Section 2 Forces that Shape Technology
                                • MiniLAB Evaluating the Benefits and Consequences of Technology
                                • Integrate Environment
                                • Integrate History
                                • Applying Science What impact does the accident at Chernobyl have on the future of nuclear power
                                • Science Online
                                • Lab Who contributes CO2
                                  • Section 3 Developing Technology
                                    • Integrate Life Science
                                    • Integrate Career
                                    • Lab Model and Invent - Care Package
                                    • Oops Accidents in Science A Slippery Situation
                                      • Chapter 2 Study Guide
                                      • Chapter 2 Review
                                      • Chapter 2 Standardized Test Practice
                                          • Unit 2 Motion Forces and Energy
                                            • Chapter 3 Motion Acceleration and Forces
                                              • Launch Lab Compare Speeds
                                              • Foldables
                                              • Section 1 Describing Motion
                                                • MiniLAB Measuring Average Speed
                                                • Science Online
                                                • Applying Math Average Speed
                                                • Integrate Astronomy
                                                • Science Online
                                                  • Section 2 Acceleration
                                                    • Integrate History
                                                    • Visualizing Acceleration
                                                      • Section 3 Motion and Forces
                                                        • Science Online
                                                        • MiniLAB Comparing Friction
                                                        • Lab Force and Acceleration
                                                        • Lab Design Your Own - Comparing Motion from Different Forces
                                                        • Science and Language Arts A Brave and Startling Truth
                                                          • Chapter 3 Study Guide
                                                          • Chapter 3 Review
                                                          • Chapter 3 Standardized Test Practice
                                                            • Chapter 4 The Laws of Motion
                                                              • Launch Lab The Force of Gravity
                                                              • Foldables
                                                              • Section 1 The First Two Laws of Motion
                                                                • MiniLAB Observing Inertia
                                                                • Science Online
                                                                • Applying Math The Acceleration of a Sled Solve a Simple Equation
                                                                  • Section 2 Gravity
                                                                    • Science Online
                                                                    • Integrate Earth Science
                                                                    • MiniLAB Observing Centripetal Force
                                                                    • Lab Gravity and Air Resistance
                                                                      • Section 3 The Third Law of Motion
                                                                        • Integrate Career
                                                                        • Visualizing Rocket Motion
                                                                        • Applying Math The Momentum of a Sprinter
                                                                        • Lab The Momentum of Colliding Objects
                                                                        • Science and History Newton and the Plague
                                                                          • Chapter 4 Study Guide
                                                                          • Chapter 4 Review
                                                                          • Chapter 4 Standardized Test Practice
                                                                            • Chapter 5 Energy
                                                                              • Launch Lab Energy Conversions
                                                                              • Foldables
                                                                              • Section 1 The Nature of Energy
                                                                                • Science Online
                                                                                • Applying Math Kinetic Energy
                                                                                • MiniLAB Interpreting Data from a Slingshot
                                                                                • Integrate Language Arts
                                                                                • Applying Math Gravitational Potential Energy
                                                                                • Lab Bouncing Balls
                                                                                  • Section 2 Conservation of Energy
                                                                                    • Visualizing Energy Transformations
                                                                                    • Integrate Environment
                                                                                    • MiniLAB Transforming Energy in a Paper Clip
                                                                                    • Science Online
                                                                                    • Integrate Health
                                                                                    • Lab Design Your Own - Swinging Energy
                                                                                    • Science and History The Impossible Dream
                                                                                      • Chapter 5 Study Guide
                                                                                      • Chapter 5 Review
                                                                                      • Chapter 5 Standardized Test Practice
                                                                                        • Chapter 6 Work and Machines
                                                                                          • Launch Lab Doing Work with a Simple Machine
                                                                                          • Foldables
                                                                                          • Section 1 Work
                                                                                            • Integrate Language Arts
                                                                                            • Applying Math Work
                                                                                            • MiniLAB Calculating Your Work and Power
                                                                                            • Applying Math Power
                                                                                              • Section 2 Using Machines
                                                                                                • MiniLAB Machines Multiplying Force
                                                                                                • Science Online
                                                                                                • Integrate Chemistry
                                                                                                  • Section 3 Simple Machines
                                                                                                    • Integrate History
                                                                                                    • Visualizing Levers in the Human Body
                                                                                                    • Science Online
                                                                                                    • Lab Levers
                                                                                                    • Lab Model and Invent - Using Simple Machines
                                                                                                    • Science and Society The Science of Very Very Small
                                                                                                      • Chapter 6 Study Guide
                                                                                                      • Chapter 6 Review
                                                                                                      • Chapter 6 Standardized Test Practice
                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                          • Launch Lab Relative Sizes of Earth the Moon and the Sun
                                                                                                          • Foldables
                                                                                                          • Section 1 Earth in Space
                                                                                                            • Science Online
                                                                                                            • Integrate Physics
                                                                                                              • Section 2 Time and Seasons
                                                                                                                • MiniLAB Modeling the Suns Rays at Solstice
                                                                                                                • Lab Comparing the Angle of Sunlight to Intensity
                                                                                                                  • Section 3 Earths Moon
                                                                                                                    • Applying Math Tides
                                                                                                                    • MiniLAB Modeling Phases and Eclipses
                                                                                                                    • Integrate History
                                                                                                                    • Integrate History
                                                                                                                    • Science Online
                                                                                                                    • Visualizing Water on the Moon
                                                                                                                    • Lab Identifying the Moons Surface Features and Apollo Landing Sites
                                                                                                                    • Oops Accidents in Science Even Great Scientists Make Mistakes
                                                                                                                      • Chapter 7 Study Guide
                                                                                                                      • Chapter 7 Review
                                                                                                                      • Chapter 7 Standardized Test Practice
                                                                                                                        • Chapter 8 The Solar System
                                                                                                                          • Launch Lab The Size of the Solar System
                                                                                                                          • Foldables
                                                                                                                          • Section 1 Planet Motion
                                                                                                                            • Integrate History
                                                                                                                            • MiniLAB Plotting Retrograde Motion
                                                                                                                            • Integrate Physics
                                                                                                                            • Applying Math Heliocentric Longitude (HL)
                                                                                                                              • Section 2 The Inner Planets
                                                                                                                                • Science Online
                                                                                                                                • Integrate Chemistry
                                                                                                                                • Lab Interpreting Features of Marss Surface
                                                                                                                                  • Section 3 The Outer Planets
                                                                                                                                    • Integrate Language Arts
                                                                                                                                    • Visualizing What Galileo Saw
                                                                                                                                    • Science Online
                                                                                                                                    • MiniLAB Comparing Sizes of Outer and Inner Planets
                                                                                                                                      • Section 4 Life in the Solar System
                                                                                                                                        • Lab Design Your Own - Testing Unknown Soil Samples for Life
                                                                                                                                        • Science Stats Night Sky Wonders
                                                                                                                                          • Chapter 8 Study Guide
                                                                                                                                          • Chapter 8 Review
                                                                                                                                          • Chapter 8 Standardized Test Practice
                                                                                                                                              • Unit 3 Energy in Motion
                                                                                                                                                • Chapter 9 Heat and States of Matter
                                                                                                                                                  • Launch Lab Expansion of a Gas
                                                                                                                                                  • Foldables
                                                                                                                                                  • Section 1 Temperature and Thermal Energy
                                                                                                                                                    • Applying Math Converting to Celsius
                                                                                                                                                    • Science Online
                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                    • Applying Math Change in Thermal Energy
                                                                                                                                                      • Section 2 States of Matter
                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                        • Science Online
                                                                                                                                                        • MiniLAB Comparing States of Water
                                                                                                                                                          • Section 3 Transferring Thermal Energy
                                                                                                                                                            • MiniLAB Comparing Thermal Conductors
                                                                                                                                                            • Visualizing Convection Currents
                                                                                                                                                            • Lab Convection in Gases and Liquids
                                                                                                                                                              • Section 4 Using Thermal Energy
                                                                                                                                                                • Integrate History
                                                                                                                                                                • Science Online
                                                                                                                                                                • Lab Conduction in Gases
                                                                                                                                                                • Science Stats Surprising Thermal Energy
                                                                                                                                                                  • Chapter 9 Study Guide
                                                                                                                                                                  • Chapter 9 Review
                                                                                                                                                                  • Chapter 9 Standardized Test Practice
                                                                                                                                                                    • Chapter 10 Waves
                                                                                                                                                                      • Launch Lab How do waves transfer energy
                                                                                                                                                                      • Foldables
                                                                                                                                                                      • Section 1 The Nature of Waves
                                                                                                                                                                        • Visualizing Formation of Ocean Waves
                                                                                                                                                                        • Science Online
                                                                                                                                                                          • Section 2 Wave Properties
                                                                                                                                                                            • MiniLAB Observing Wavelength
                                                                                                                                                                            • Integrate Social Studies
                                                                                                                                                                            • Applying Math The Speed of Sound
                                                                                                                                                                            • Lab Wave Speed and Tension
                                                                                                                                                                              • Section 3 The Behavior of Waves
                                                                                                                                                                                • Science Online
                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                • MiniLAB Experimenting with Resonance
                                                                                                                                                                                • Lab Measuring Wave Properties
                                                                                                                                                                                • Science and History Making Waves
                                                                                                                                                                                  • Chapter 10 Study Guide
                                                                                                                                                                                  • Chapter 10 Review
                                                                                                                                                                                  • Chapter 10 Standardized Test Practice
                                                                                                                                                                                    • Chapter 11 Sound and Light
                                                                                                                                                                                      • Launch Lab What sound does a ruler make
                                                                                                                                                                                      • Foldables
                                                                                                                                                                                      • Section 1 Sound
                                                                                                                                                                                        • MiniLAB Comparing Intensity
                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                        • Science Online
                                                                                                                                                                                        • Applying Math Using Sonar
                                                                                                                                                                                          • Section 2 Reflection and Refraction of Light
                                                                                                                                                                                          • Section 3 Mirrors Lenses and the Eye
                                                                                                                                                                                            • Visualizing Images Formed by a Convex Lens
                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                            • MiniLAB Experimenting with Focal Lengths
                                                                                                                                                                                            • Lab Reflections of Reflections
                                                                                                                                                                                              • Section 4 Light and Color
                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Lab Design Your Own - Blocking Noise Pollution
                                                                                                                                                                                                • Science and Language Arts A Haiku Garden The Four Seasons in Poems and Print
                                                                                                                                                                                                  • Chapter 11 Study Guide
                                                                                                                                                                                                  • Chapter 11 Review
                                                                                                                                                                                                  • Chapter 11 Standardized Test Practice
                                                                                                                                                                                                    • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                      • Launch Lab Global Jigsaw Puzzle
                                                                                                                                                                                                      • Foldables
                                                                                                                                                                                                      • Section 1 Evolution of Earths Crust
                                                                                                                                                                                                        • Applying Math Spreading Distances
                                                                                                                                                                                                        • Integrate Physics
                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                          • Section 2 Earthquakes
                                                                                                                                                                                                            • MiniLAB Demonstrating Four Types of Stress
                                                                                                                                                                                                            • Visualizing Earthquake-Proof Buildings
                                                                                                                                                                                                              • Section 3 Earths Interior
                                                                                                                                                                                                              • Section 4 Volcanoes
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • MiniLAB Modeling Lava Viscosity
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                • Lab A Case for Pacific Plate Motion
                                                                                                                                                                                                                • Lab Earthquake Earthquake Wheres the earthquake
                                                                                                                                                                                                                • Science and History Volcano Weather
                                                                                                                                                                                                                  • Chapter 12 Study Guide
                                                                                                                                                                                                                  • Chapter 12 Review
                                                                                                                                                                                                                  • Chapter 12 Standardized Test Practice
                                                                                                                                                                                                                      • Unit 4 Forms of Energy
                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                          • Launch Lab Electric Circuits
                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                          • Section 1 Electric Charge
                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                            • Visualizing Lightning
                                                                                                                                                                                                                            • MiniLAB Investigate Charged Objects
                                                                                                                                                                                                                              • Section 2 Electric Current
                                                                                                                                                                                                                                • MiniLAB Investigating Battery Addition
                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                • Lab Identifying Conductors and Insulators
                                                                                                                                                                                                                                  • Section 3 Electrical Energy
                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                    • Applying Math Power Used by a Clothes Dryer
                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                    • Applying Math Electrical Energy Used by a Microwave Oven
                                                                                                                                                                                                                                    • Lab Design Your Own - Comparing Series and Parallel Circuits
                                                                                                                                                                                                                                    • Science and Language Arts Invisible Man
                                                                                                                                                                                                                                      • Chapter 13 Study Guide
                                                                                                                                                                                                                                      • Chapter 13 Review
                                                                                                                                                                                                                                      • Chapter 13 Standardized Test Practice
                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                          • Launch Lab The Strength of Magnets
                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                          • Section 1 Magnetism
                                                                                                                                                                                                                                            • MiniLAB Observing Magnetic Interference
                                                                                                                                                                                                                                            • Integrate Earth Science
                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                            • Applying Science How can magnetic parts of a junk car be salvaged
                                                                                                                                                                                                                                            • MiniLAB Making Your Own Compass
                                                                                                                                                                                                                                              • Section 2 Electricity and Magnetism
                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                  • Section 3 Producing Electric Current
                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                    • Visualizing Motors and Generators
                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                    • Lab Electricity and Magnetism
                                                                                                                                                                                                                                                    • Lab Design Your Own - Controlling Electromagnets
                                                                                                                                                                                                                                                    • Science and History Body Art
                                                                                                                                                                                                                                                      • Chapter 14 Study Guide
                                                                                                                                                                                                                                                      • Chapter 14 Review
                                                                                                                                                                                                                                                      • Chapter 14 Standardized Test Practice
                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                          • Launch Lab Can electromagnetic waves change materials
                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                          • Section 1 What are electromagnetic waves
                                                                                                                                                                                                                                                            • MiniLAB Investigating Electromagnetic Waves
                                                                                                                                                                                                                                                            • Applying Math The Speed of Light in Water
                                                                                                                                                                                                                                                              • Section 2 The Electromagnetic Spectrum
                                                                                                                                                                                                                                                                • MiniLAB Heating with Microwaves
                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                • Lab The Shape of Satellite Dishes
                                                                                                                                                                                                                                                                  • Section 3 Radio Communication
                                                                                                                                                                                                                                                                    • Visualizing Radio Broadcasts
                                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Lab Use the Internet - Radio Frequencies
                                                                                                                                                                                                                                                                    • Science and History Riding a Beam of Light
                                                                                                                                                                                                                                                                      • Chapter 15 Study Guide
                                                                                                                                                                                                                                                                      • Chapter 15 Review
                                                                                                                                                                                                                                                                      • Chapter 15 Standardized Test Practice
                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                          • Launch Lab Heating with Solar Energy
                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                          • Section 1 Fossil Fuels
                                                                                                                                                                                                                                                                            • Visualizing The Formation of Fossil Fuels
                                                                                                                                                                                                                                                                            • MiniLAB Designing an Efficient Water Heater
                                                                                                                                                                                                                                                                              • Section 2 Nuclear Energy
                                                                                                                                                                                                                                                                                • Integrate Earth Science
                                                                                                                                                                                                                                                                                • Integrate Social Science
                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                • Applying Science Can a contaminated radioactive site be reclaimed
                                                                                                                                                                                                                                                                                  • Section 3 Renewable Energy Sources
                                                                                                                                                                                                                                                                                    • MiniLAB Using Solar Power at Home
                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                    • Lab Solar Heating
                                                                                                                                                                                                                                                                                    • Lab Use the Internet How much does energy really cost
                                                                                                                                                                                                                                                                                    • Science and Society Reacting to Nuclear Energy
                                                                                                                                                                                                                                                                                      • Chapter 16 Study Guide
                                                                                                                                                                                                                                                                                      • Chapter 16 Review
                                                                                                                                                                                                                                                                                      • Chapter 16 Standardized Test Practice
                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                          • Lab Atmospheric Pressure
                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                          • Section 1 Earths Atmosphere
                                                                                                                                                                                                                                                                                            • MiniLAB Visualizing Convection
                                                                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                                                                            • Lab Visualizing a Temperature Inversion
                                                                                                                                                                                                                                                                                              • Section 2 Weather
                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Coriolis Effect
                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                  • Section 3 Climate
                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                    • Visualizing Earths Biogeophysical System
                                                                                                                                                                                                                                                                                                      • Section 4 Earths Changing Climates
                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                        • Applying Math Carbon Dioxide (CO2) Concentration
                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Investigating Microclimate
                                                                                                                                                                                                                                                                                                        • Science and Language Arts The Grapes of Wrath
                                                                                                                                                                                                                                                                                                          • Chapter 17 Study Guide
                                                                                                                                                                                                                                                                                                          • Chapter 17 Review
                                                                                                                                                                                                                                                                                                          • Chapter 17 Standardized Test Practice
                                                                                                                                                                                                                                                                                                              • Unit 5 Matter and Earth Materials
                                                                                                                                                                                                                                                                                                                • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                  • Launch Lab Demonstrate the Distillation of Water
                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                  • Section 1 Composition of Matter
                                                                                                                                                                                                                                                                                                                    • Visualizing Elements
                                                                                                                                                                                                                                                                                                                    • MiniLAB Classifying Materials
                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                    • Lab Comparing Pure Substances and Mixtures
                                                                                                                                                                                                                                                                                                                      • Section 2 Properties of Matter
                                                                                                                                                                                                                                                                                                                        • Integrate Environment
                                                                                                                                                                                                                                                                                                                        • MiniLAB Separating Ink
                                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                                        • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                        • Applying Math The Law of Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Measuring the Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Science Stats Intriguing Elements
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Study Guide
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Review
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                            • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                              • Launch Lab Inferring What You Cant Observe
                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                              • Section 1 Structure of the Atom
                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling an Aluminum Atom
                                                                                                                                                                                                                                                                                                                                • Visualizing The Atomic Model
                                                                                                                                                                                                                                                                                                                                  • Section 2 Masses of Atoms
                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                    • Applying Science How can radioactive isotopes help tell time
                                                                                                                                                                                                                                                                                                                                      • Section 3 The Periodic Table
                                                                                                                                                                                                                                                                                                                                        • MiniLAB Organizing a Personal Periodic Table
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Career
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                                                                                                                                                                        • Lab A Periodic Table of Foods
                                                                                                                                                                                                                                                                                                                                        • Lab Use the Internet Whats in a name
                                                                                                                                                                                                                                                                                                                                        • Science and History A Chilling Story
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Study Guide
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Review
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                            • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                              • Launch Lab Earth Materials at Home and School
                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                              • Section 1 Minerals
                                                                                                                                                                                                                                                                                                                                                • MiniLAB Identifying Salts Crystal System
                                                                                                                                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                • Lab Be a Mineral Detective
                                                                                                                                                                                                                                                                                                                                                  • Section 2 Igneous Rocks
                                                                                                                                                                                                                                                                                                                                                    • Applying Math Extrusive Igneous Rock Classification
                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                      • Section 3 Sedimentary Rocks
                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Evaporites
                                                                                                                                                                                                                                                                                                                                                          • Section 4 Metamorphic Rocks and the Rock Cycle
                                                                                                                                                                                                                                                                                                                                                            • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                            • Visualizing Shock Metamorphic Rock
                                                                                                                                                                                                                                                                                                                                                            • Lab Identifying Rocks
                                                                                                                                                                                                                                                                                                                                                            • Science and Society Earth Materials at Work
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Study Guide
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Review
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                  • Launch Lab Have you got the time
                                                                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                                                                  • Section 1 Weathering and Soil
                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing a Disappearing Seasoning
                                                                                                                                                                                                                                                                                                                                                                    • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                    • Lab Graphing Soil Textures
                                                                                                                                                                                                                                                                                                                                                                      • Section 2 Shaping the Landscape
                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Runoff
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                          • Section 3 Groundwater
                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Porosity Volume
                                                                                                                                                                                                                                                                                                                                                                            • Visualizing The Role of Groundwater in Shaping Earths Surface
                                                                                                                                                                                                                                                                                                                                                                            • Integrate Environment
                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                              • Section 4 Geologic Time
                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                                                                                                • Lab Its about time - relative that is
                                                                                                                                                                                                                                                                                                                                                                                • Science and Society Tapping into the Underground
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Review
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                      • Unit 6 Interactions of Matter
                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                          • Lab Chemical Bonds and Mixing
                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Stability in Bonding
                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                            • Lab Atomic Trading Cards
                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Types of Bonds
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Observing a Bond Type
                                                                                                                                                                                                                                                                                                                                                                                                • Visualizing Polar Molecules
                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Writing Formulas and Naming Compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math Determining a Formula
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Science Can you name binary ionic compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Making a Hydrate
                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Model and Invent - Modeling Chemical Bonding
                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Sticky Subject
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Review
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab RustingmdashA Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Chemical Changes
                                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Designing a Team Equation
                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Chemical Equations
                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math Barium Sulfate Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Classifying Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 4 Reaction Rates and Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing Chemical Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Creating a Colorful Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab To Glow or Not to Glow
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Investigating Reaction Conditions
                                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Clumsy Move Pays Off
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Review
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab Magic Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 How Solutions Form
                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                                                                                                                                                                                                                                                            • Visualizing Metal Alloys
                                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Observing the Effect of Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Solubility and Concentration
                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Acids Bases and Salts
                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing Acid Relief
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Strength of Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Determining Acidity
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Saturated Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and Society Acid Rain
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab The Size of a Nucleus
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Strong Force
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Nuclear Decay
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Detecting Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math The Age of Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Social Studies
                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Nuclear Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling a Nuclear Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Visualizing PET Scans
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Chain Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Model and Invent Modeling Transmutations
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and History The Nuclear Alchemist
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 26 Stars and Galaxies
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab Stars in the Sky
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Observing the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling a Telescope
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math The Magnifying Power of Telescopes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Evolution of Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Counting Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing H-R Diagrams of Star Clusters
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Star Cluster Age
                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 3 Galaxies and the Milky Way
                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 4 Cosmology
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Lab Model and Invent - Expansion of the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Science and Language Arts Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Student Resources
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Scientific Methods
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Safety Symbols
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Safety in the Science Laboratory
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Math Skill Handbook
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Extra Math Problems
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Reference Handbook
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Minerals
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Physical Science Reference Tables
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 1 The Nature of Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 2 Science Technology and Society
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 3 Motion Acceleration and Forces
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 4 The Laws of Motion
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 5 Energy
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 6 Work and Machines
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 8 The Solar System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 9 Heat and States of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 10 Waves
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 11 Sound and Light
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 25 Nuclear Changes
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Page 18: 706 S1 318-326 GPS09 - Light-and-Sound - home · PDF fileWhat sound does a ruler make? ... sound waves cannot travel in empty space where there are no particles. ... sound travels

SECTION 3 Mirrors Lenses and the Eye 335

Concave Lenses A concave lens is thinnerin the middle and thicker at the edges Asshown in Figure 20 light rays that passthrough a concave lens bend away from theoptical axis The rays spread out and nevermeet so a real image is never formed Theimage is always virtual upright and smallerthan the object is Concave lenses are used insome types of eyeglasses and some telescopesConcave lenses usually are used in combinationwith other lenses

What type of image is formed by a concave lens

The Human EyeWhat determines how well you can see the words on this

page If you donrsquot need eyeglasses the structure of your eye givesyou the ability to focus on these words and other objects aroundyou Look at Figure 21 Light enters your eye through a trans-parent covering on your eyeball called the cornea The corneacauses light rays to bend so that they converge The light thenpasses through an opening called the pupil Behind the pupil isa flexible convex lens Muscles attached to the lens change itsshape to help focus light forming a sharp image on your retina

The retina is the inner lining of your eye The retina con-tains light-sensitive cells that convert an image into electricalsignals These signals then are carried along the optic nerve toyour brain to be interpreted With this complex structurethe human eye is capable of seeing clearly in bright and dimconditions focusing on both near and far objects and alsodetecting colors

Figure 20 A concave lens

refracts light rays so they spread

out away from the optical axis

Classify Is a concave lens mostlike a concave mirror or a convexmirror

Optical axis

Retina

Focalpoint

Pupil

Cornea

Lens

Optic nerve

Figure 21 The cornea and lens in your eye

bend light rays so that a sharp image is

formed on the retina

Eye Doctors Optometristsand ophthalmologists treatmany different eye prob-lems They often useadvanced technology todiagnose and correct mal-functioning parts of theeye Research an eye prob-lem and how it is treatedWrite a paragraph describ-ing what parts of the eyeare affected by the problemand how doctors correct it

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336 CHAPTER 11 Sound and Light

Brightness and Intensity The human eye can adjust to thebrightness of the light that strikes it If you step outside on asunny day you may have to shade your eyes against the intensityof the sunlight Light intensity is the amount of light energy thatstrikes a certain area each second Brightness is the human per-ception of light intensity Sunlight seems bright because a largeamount of light energy strikes your retina each second Youreyes respond to bright light by decreasing the size of your pupilThis reduces the amount of light that enters your eye and strikesthe retina

Intensity depends on your distance from a light source Ifyou move away from a bare lightbulb you can see how theintensity of the light rapidly decreases Because light rays spreadout from the source less light energy strikes your retina thefarther away you are from the bulb

Correcting Vision ProblemsIf you have good vision you should be able to see objects

clearly when they are 25 cm or farther away from your eyes Asharp image of an object should be formed on your retinaHowever for many people the image is blurry or formed in thewrong place causing vision problems

Farsightedness If you can see distant objects clearly butcanrsquot bring nearby objects into focus then you are farsighted Inthis case the eyeball might be too short or the lens isnrsquot curvedenough to form a sharp image of nearby objects on the retinaas shown in Figure 22 To correct the problem convex lensescan be used to bend incoming light rays so they converge beforethey enter the eye

Experimenting withFocal LengthsProcedure1 Complete the safety form

2 Fill a glass test tube with

water and seal it with a

lid or stopper3 Type or print SULFUR

DIOXIDE in capital letters

on a piece of paper4 Set the test tube horizon-

tally over the words

Record your observations

5 Hold the tube at several

heights above the words

Record your observations

Analysis1 Describe how the words

changed as the height of

the test tube increased

2 Classify the image at each

height as real or virtual

Focal

point

Correctedfarsighted eye

Light fromnearby object

Focalpoint

Light fromnearby object

Farsighted eye

The focal length of a farsighted eye is too long to form

a sharp image of nearby objects on the retina

A convex lens in front of a farsighted eye enables a sharp

image of nearby objects to be formed on the retina

Figure 22 Farsightedness can

be corrected by convex lenses

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SECTION 3 Mirrors Lenses and the Eye 337

Self Check

1 Diagram how light rays from an object are reflected by

a convex mirror to form an image

2 Infer how the size of the image changes if an object

that is less than one focal length from a concave mirror

moves closer to the mirror

3 Explain how the focal length of a convex lens changes

as the sides of the lens become less curved

4 Compare the image of an object less than one focal

length from a convex lens with the image of an object

more than two focal lengths from the lens

5 Think Critically Describe the image formed by a light

source placed at the focal point of a convex lens

Summary

Mirrors

bull A plane mirror forms upright virtual images

bull The image formed by a concave mirror

depends on the location of the object relative

to the focal point

bull Convex mirrors always produce virtual upright

images that are smaller than the object

Lenses

bull The image formed by a convex lens depends

on the distance of the object from the lens

bull Concave lenses always form virtual upright

images that are smaller than the object

The Eye and Vision

bull The eye contains a lens that changes shape to

produce sharp images on the retina

bull Farsightedness occurs when the eye cannot

form a sharp image of nearby objects

Nearsightedness occurs when the eye cannot

form sharp images of distant objects

6 Calculate Object Distance If you looked through a

convex lens with a focal length of 15 cm and saw a

real inverted enlarged image what is the maximum

distance between the lens and the object

Nearsightedness If you have nearsighted friends you knowthat they can see only nearby objects clearly Their eyes cannotform a sharp image on the retina of an object that is far awayInstead the image is formed in front of the retina as shown inFigure 23 To correct this problem a nearsighted person canwear concave lenses Figure 23 shows how a concave lens causesincoming light rays from distant objects to diverge before theyreach the eye Then the rays can be focused by the eye to form asharp image on the retina

Figure 23 Nearsightedness can

be corrected with concave lenses

Focalpoint

Light fromdistant object

Nearsighted eye

Focalpoint

Light fromdistant object

Correctednearsighted eye

When a nearsighted person looks at distant objects a

sharp image is formed in front of the retina

A concave lens in front of a nearsighted eye makes light

rays diverge so a sharp image is formed on the retina

More Section Review gpesciencecom

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How can you see the back of your head You

can use two mirrors to view a reflection of a

reflection of the back of your head

Real-World ProblemHow many images are seen in two mirrors

Goal Infer how the number of images depends

on the angle between two mirrors

Materialsplane mirrors (2) protractor

masking tape paper clip

Safety Precautions

Handle glass mirrors and paper clips carefully

Procedure1 Complete the safety form

2 Lay one mirror on top of the other with the

mirror surfaces together Tape together one

side so they can open and close Use tape to

label them L and R for left and right

3 Open the mirrors and stand them on a sheet

of paper at an angle of 72deg

4 Bend one leg of a paper clip up 90deg and

place it close to the front of the R mirror

5 Count the number of images of the paper

clip you see in the R and L mirrors Record

these numbers in your data table

6 The mirrors create an image of a circle

divided into wedges Record the number

of wedges

7 Hold the R mirror still and slowly move the Lmirror to 90deg Record the numbers of images

of the clip and wedges in the circle Repeat

this time opening the mirrors to 120deg

Conclude and Apply1 Infer the relationship between the number

of wedges and paper clip images

2 Determine the angle that would divide a

circle into six wedges Hypothesize how

many images would be produced Test your

hypothesis

Reflections of Reflections

Demonstrate for younger students the

relationship between the angle of the

mirrors and the number of reflections

338 CHAPTER 11 Sound and Light

Angle

Number of Number

of Mirrors Paper Clip Images

of Wedges R L

72ordm

90ordm

120ordm

Images and Wedges Seen in the Mirrors

Do not write in this book

SECTION 4 Light and Color 339

Why Objects Have ColorWhy do some apples appear red while others look green or

yellow An objectrsquos color depends on the wavelengths of light itreflects Recall that white light is a blend of all colors of visiblelight When a red apple is struck by white light it reflects redlight back to your eyes and absorbs all of the other colorsFigure 24 shows white light striking a green leaf Only the wave-lengths corresponding to green light are reflected to your eyes

Although some objects appear to be black black isnrsquot acolor Black is the absence of visible light Objects that appearblack absorb all colors of light and reflect little or no light backto your eyes White objects appear to be white because theyreflect all colors of visible light

Why does a white object appear white

Colored Filters Wearing tinted glasses changesthe color of almost everything you see If the lensesare yellow the world takes on a golden glow If theyare rose colored everything looks rosy Somethingsimilar would occur if you placed a colored clearplastic sheet over this white page The paper wouldappear to be the same color as the plastic The plasticsheet and the tinted lenses are filters A filter is atransparent material that transmits one or more col-ors of light but absorbs all others The color of a fil-ter is the color of the light that it transmits

Light and Color

Reading Guide

Explain how you see color Describe the difference between

light color and pigment color Predict what happens when dif-

ferent colors are mixed

From traffic lights to great works of

art color is an important part of your

world

Review Vocabulary

retina inner layer of the eye con-

taining cells that convert light

images into electrical signals

New Vocabulary

bull pigment

Figure 24 This leaf absorbs all

wavelengths of visible light except

the wavelengths you see as green

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340 CHAPTER 11 Sound and Light

Looking Through Colored Filters Figure 25 shows howthe color of an object can change when you look at it throughvarious colored filters The cooler looks blue under white lightbecause it reflects only the wavelengths of blue light that strikeit If you look at the cooler through a blue filter the cooler stilllooks blue because the blue filter transmits the reflected bluelight However if you look at the cooler through a red filter thecooler seems black because the red filter blocks the blue lightreflected by the cooler

Why does a blue object appear black whenviewed through a red filter

Seeing ColorAs you approach a busy intersection the color of the traffic

light changes from green to yellow to red On the cross street thecolor changes from red to green At a busy intersection trafficsafety depends on your ability to detect color changes rapidlyHow do you see colors

Light and the Eye In a healthy eye light enters the eyethrough the cornea is focused by the lens and finally forms animage on the retina The retina is made up of two types of cellsthat absorb light as shown in Figure 26 When these cellsabsorb light energy chemical reactions convert light energy intonerve impulses that are transmitted to the brain One type ofcell in the retina called a cone enables you to distinguish colorsand detailed shapes of objects Cones need bright light to gener-ate nerve impulses so they do not operate in dim light As aresult even brightly colored objects might look gray or black indim light

Figure 25 The color of this

cooler changes when viewed

through different color filters

Topic Color BlindnessVisit for Web

links to information about the

causes of color blindness

Activity Research the causes

and types of color blindness Find

out how cones are related to the

ability to distinguish colors

gpesciencecom

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SECTION 4 Light and Color 341

Cones and Rods Your eyes have three types of cones each ofwhich responds to a different range of wavelengths Red conesrespond to mostly red and yellow light Green cones respond tomostly yellow and green light Blue cones respond to mostlyblue and violet light The second type of cell in the retina calleda rod is sensitive to dim light and enables you to see at nightHowever rod cells do not enable you to see colors

Interpreting Color Why does a bananalook yellow The light reflected by the

banana causes the cone cells that are sensitive to red and greenlight to send signals to your brain Your brain could get the samesignal if a mixture of red light and green light reached your eyesThis mixture also would cause your red and green cones torespond and you would see the color yellow As a result lightwith wavelengths corresponding to yellow light and light that isa mixture of red and green light both cause the color yellow tobe seen What happens when you look at a white shirt You seewhite when all wavelengths of visible light enters your eyes Thenall three sets of cones cells send signals to the brain The com-bination of these signals cause you to see the shirt as white

Color Blindness If one or more of your sets of cone cellsdo not function properly you might not be able to distinguishcertain colors This condition is called color blindness orcolor deficiency About eight percent of men and one-halfpercent of women have some form of color blindness Themost common form of color blindness makes it difficult todistinguish between red and green Figure 27 shows an imagethat is used in a test for redndashgreen color blindness Becausered and green are used in traffic signals drivers and pedestri-ans must be able to identify them

Retina

Rod

Cone

Lens

Figure 27 Color blindness is an

inherited sex-linked condition in

which certain sets of cones in the

retina do not function properly

Identify the number that you seein the dots

Figure 26 Light enters the eye

and focuses on the retina The two

types of light-detecting cells

that make up the retina

are called rods and cones

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342 CHAPTER 11 Sound and Light

Mixing ColorsIf you have ever browsed through a paint store you have

probably seen displays where customers can select paint samplesof almost every imaginable color The colors are a result of mix-tures of pigments For example you might have mixed blue andyellow paint to produce green paint A pigment is a coloredmaterial that is used to change the color of other substancesThe color of a pigment results from the different wavelengths oflight that the pigment reflects

Mixing Colored Lights From the glowing orange of a sun-set to the deep blue of a mountain lake all the colors you see canbe made by mixing three colors of light These three colorsmdashred green and bluemdashare the primary colors of light They cor-respond to the three different types of cones in the retina ofyour eye When mixed together in equal amounts they producewhite light as Figure 28 shows Mixing the primary colors indifferent proportions can produce the colors you see

What are the primary colors of light

Paint Pigments If you were to mix equal amounts of redgreen and blue paint would you get white paint If mixing col-ors of paint were like mixing colors of light you would but mix-ing paint is different Paints are made with pigments Pigmentsproduce color as a result of the wavelengths of light they reflectPaint pigments usually are made of chemical compounds suchas titanium oxide a bright white pigment and lead chromatewhich is used for painting yellow lines on highways

Figure 28 White light is pro-

duced when the three primary col-

ors of light are mixed in equal

amounts

Color for PhotosynthesisPlant pigments determinethe wavelengths oflight for photosynthesisLeaves usually look greenbecause of the pigmentchlorophyll Chlorophyllabsorbs most wave-lengths of visible lightexcept green which itreflects However not allplants are green Researchdifferent plant pigmentsto find out how they allowplant species to survive indiverse habitats

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SECTION 4 Light and Color 343

Self Check

1 Identity what colors are reflected and what colors are

absorbed if a white light shines on a red shirt

2 Discuss how the primary colors of light differ from the

primary pigment colors

3 Explain why a red apple would appear black if you

looked at it through a blue filter

4 Determine why a white fence appears to be white instead

of multicolored if all colors are present in white light

5 Think Critically Light reflected from an object passes

through a green filter then a red filter and finally a

blue filter What color will the object seem to be

Summary

Why Objects Have Color

bull The color of an object is determined by the

wavelengths of light it reflects

bull The color of a filter is the color of the light the

filter transmits

Seeing Color

bull Rod and cone cells are light-sensitive cells

found in the retina of the human eye

bull Rod cells are sensitive to dim light Cone cells

enable colors to be seen

bull There are three types of cone cells One type

responds to red light another to green light

and another to blue light

Mixing Colors

bull Red green and blue are the primary light

colors Any color of light can be created by

mixing these primary light colors

bull Any pigment color can be formed by mixing

the primary pigment colorsmdashmagenta cyan

and yellow

6 Use Percentages In the human eye there are about

120000000 rods If 90000000 rods trigger at once

what percentage of the total number of rods triggered

7 Convert Units The wavelengths of light are measured

in nanometers (nm) which equals 0000001 mm

Find the wavelength in mm of a light wave that has a

wavelength of 690 nm

Mixing Pigments You can make any pigment color by mixingdifferent amounts of the three primary pigmentsmdashmagenta(bluish red) cyan (greenish blue) and yellow In fact color print-ers use these pigments as well as black ink to make full-colorprints like the pages in this book A primary pigmentrsquos colordepends on the wavelengths of the light that it reflects Actuallypigments both absorb and reflect a range of colors in sending asingle color message to your eye For example in white lightyellow pigment appears yellow because it reflects red and greenlight but absorbs the other wavelengths of visible light The colorof a mixture of two primary pigments is determined by theprimary colors of light that both pigments reflect

Look at Figure 29 The area in the center where the colors alloverlap appears to be black because the three blended primarypigments absorb all the primary colors of light Recall that theprimary colors of light combine to produce white light They arecalled additive colors However when the primary pigment col-ors are combined they absorb all wavelengths of visible light andproduce black Because black results from the absence ofreflected light the primary pigments are called subtractive colors

Figure 29 The three primary

pigment colors appear to be black

when they are mixed

Describe how the primary pigmentcolors are similar to the primary col-ors of light

More Section Review gpesciencecom

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Design Your OwnDesign Your Own

344

Real-World ProblemWhat loud noises do you enjoy and which ones do you find annoying

Most people enjoy a music concert performed by their favorite artist or

the booming displays of fireworks on the Fourth of July Most people

enjoy these loud sounds for short periods of time However certain

other loud noises such as traffic sirens and loud talking can be

annoying Constant annoying noises are called noise pollution What

can be done to reduce noise pollution What types of barriers will best

block out noise pollution

Form a HypothesisBased on your experiences with loud noises form a hypothesis that

predicts the effectiveness of different types of barriers at blocking out

noise pollution

Test Your HypothesisMake a Plan

1 Complete the safety form

2 Decide what type of barriers or materials you will test

3 Describe exactly how you will use these materials

Goals Design an experiment

that tests the effective-

ness of various types of

barriers and materials

for blocking out noise

pollution

Test different types of

materials and barriers

to determine the best

noise blocks

Possible Materialsradio CD player horn

drum or other loud

noise source

shrubs trees concrete

walls brick walls stone

walls wooden fences

parked cars or hanging

laundry

sound meter

meterstick or metric tape

measure

Blocking NfisePollution

4 Identify the controls and variables you will use in your

experiment

5 List the steps you will use and describe each step precisely

6 Prepare a data table in your Science Journal to record your

measurements

7 Organize the steps of your experiment in logical order

Follow Your Plan

1 Ask your teacher to approve your plan and data table before

you start

2 Conduct your experiment as planned

3 Test each barrier two or three times

4 Record the results from each test in your data table in your Science Journal

Analyze Your Data1 Identify the barriers that most effectively reduced noise pollution

2 Identify the barriers that least effectively reduced noise pollution

3 Compare the effective barriers and identify common characteristics that might

explain why they reduced noise pollution

4 Compare the natural barriers you tested with the artificial barriers Which type

of barrier best reduced noise pollution

5 Compare the different types of materials the barriers were made of Which

type of material best reduced noise pollution

Conclude and Apply1 Evaluate whether your results support your hypothesis

2 Predict how your results would differ if you used a louder source of noise such

as a siren

3 Infer from your results how people living near a

busy street could reduce noise pollution

4 Identify major sources of noise pollution in or

near your home How could they be reduced

5 Research how noise pollution can be

unhealthy

LAB 345

Draw a poster illustrating how builders and

landscapers could use certain materials to

better insulate a home or office from excess

noise pollution

346 CHAPTER 11 Sound and Light

A Haiku GardenThe Four Seasons in Poems and Prints

by Stephen Addiss with Fumiko and Akira Yamamoto

Respond to the Reading1 How do the illustrations help the reader

better understand the poems2 What do you think is meant by the

word lingering in the Haiku about springsunlight

3 Linking Science and Writing Writeone haiku about summer and anotherabout fall In one poem use color tohelp you describe the season In theother use light or some property oflight to help describe the season

Research has deter-mined that there is a

connection between color and mood Warmcolors have longer wavelengths and can bemore stimulating Cool colors which haveshorter wavelengths tend to have a calmingor soothing effect on people Light and colorhave long been used as literary symbols Doesthe use of color change what you imaginewhen you read the haiku

UnderstandingLiteratureJapanese Haiku A haiku is a verse thatconsists of three lines and 17 syllables inthe Japanese language The first and thirdlines have five syllables each and themiddle line has seven syllables Why isimagination important in reading haiku

Lingering

in every pool of watermdash

spring sunlightIssa

Withered by winter

the sound of the windmdash

one-color worldBasho

Sound

1 Sound waves are compressional waves thattravel only in matter

2 The speed of sound in a material dependson the type of material as well as itstemperature

3 Loudness depends on a sound waversquos inten-sity Pitch depends on a sound waversquosfrequency

4 Sound waves are used in echolocationsonar and medical imaging

Reflection and Refractionof Light

1 Light can be absorbed reflected or trans-mitted by a material

2 When light waves are reflected theyobey the law of reflectionmdashthe angle ofincidence equals the angle of reflection

3 A light wave is refracted or bent whenit changes speed as it travels at an anglefrom one material to another

Mirrors Lenses andthe Eye

1 Plane mirrors form upright virtual images

2 Images formed by concave mirrors andconvex lenses depend on the location ofthe object relative to the focal point

3 Convex mirrors and concave lenses formvirtual upright images that are smallerthan the object

4 The lens in the human eye changes shape toproduce a sharp image on the retina

Light and Color

1 You see color when light is reflected offobjects and into your eyes

2 Cone cells in the retina are light-sensitivecells that enable you to distinguish colors

3 Red blue and green are the three primarycolors of light and can be mixed to form allother colors

4 The primary pigment colors are magentacyan and yellow

CHAPTER STUDY GUIDE 347

Use the Foldable you made at the beginningof the chapter to help you review sound and light

Interactive Tutor gpesciencecom

Complete each statement with the correctvocabulary word or phrase

1 A change in frequency due to a movingsound source is due to the

2 A flat smooth surface that reflects light andforms an image is a(n)

3 An object is if you can seethrough it clearly

4 The of a material indicates howmuch the speed of light in the materialchanges as light passes through

5 You can change the color of white paint byadding a(n) to it

6 A(n) is a reflecting surface thatcurves outward like the back of a spoon

7 The human perception of the intensity of asound wave is

Choose the word or phrase that best answerseach question

8 Which of the following best describes imageformation by a plane mirrorA) A real image is formed in front of the mirrorB) A real image is formed behind the mirrorC) A virtual image is formed in front of the

mirrorD) A virtual image is formed behind the mirror

9 For a sound with low pitch what else isalso always lowA) amplitude C) wavelengthB) frequency D) wave velocity

10 Which of the following occurs when asound source moves away from youA) The soundrsquos velocity decreasesB) The soundrsquos loudness increasesC) The soundrsquos frequency decreasesD) The soundrsquos frequency increases

Use the table below to answer question 11

11 Based on the data in the table abovewhich of the following would be the speedof sound in air at 30degCA) 3404 ms C) 3494 msB) 3464 ms D) 3534 ms

12 What happens to a light ray travelingparallel to the optical axis of a convexlens that passes through the lensA) It travels parallel to the optical axisB) It passes through the focal pointC) It is bent away from the optical axisD) It forms a virtual image

13 Light waves of which color are bent mostwhen passing through a prismA) blue C) violetB) red D) yellow

14 Which way does a concave lens bend lightA) toward its optical axisB) toward its centerC) toward its edgesD) toward its focal point

Speed of Sound in Air

Temp peed( s)

4

4

4

348 CHAPTER REVIEW

concave lens p 335concave mirror p 332convex lens p 333convex mirror p 333decibel p 322Doppler effect p 323index of refraction p 329intensity p 322

loudness p 322opaque p 327pigment p 342pitch p 323plane mirror p 331translucent p 327transparent p 327

Vocabulary PuzzleMaker gpesciencecom

Use the illustration below to answer question 15

15 Describe how the position of the candlechanged if the image of the candle movedaway from the focal point

16 Apply Acoustic scientists sometimes doresearch in rooms that absorb all soundwaves How could such a room be used tostudy how bats find their food

17 Compare White light passes through atranslucent pane of glass and shines on ashirt Both the translucent glass and theshirt appear green Compare the colors oflight that are absorbed and transmitted bythe glass and the shirt

18 Infer Most mammals including dogs andcats canrsquot see colors Infer how the retinaof a catrsquos eye might be different from theretina of a human eye

19 Determine whether a convex lens could forman image that is enlarged real and upright

20 Infer A car comes to a railroad crossingThe driver hears a trainrsquos whistle and itspitch becomes lower What can beassumed about how the train is moving

21 Compare and contrast the reflection of lightfrom a white wall with a rough surfacewith the reflection of light from a mirror

Optical axis

One

focal

length

Two

focal

lengths

Image

Ray A

Object

Focal

point

Interpreting Graphics 22 Infer why a convex mirror and a concavelens can never produce a real image

23 Predict what color a white shirt wouldappear to be if the light reflected from theshirt passed through a red filter and thenthrough a green filter

24 Explain why windows might begin to rattlewhen an airplane flies overhead

25 Communicate Some people enjoy usingsnowmobiles Others object to the noisethat they make Write a proposal for a pol-icy that seems fair to both groups for theuse of snowmobiles in a state park

CHAPTER REVIEW 349

Use the wave speed equation ν ƒλ to answer

questions 26 and 27

26 Calculate Frequency A sonar pulse has awavelength of 30 cm and a speed inwater of 1500 ms Find its frequency

27 Calculate Wavelength What is the wave-length of a sound wave with a fre-quency of 440 Hz if the speed of soundin air is 340 ms

28 Calculate Angle of Incidence A light ray isreflected from a mirror If the anglebetween the incident ray and thereflected ray is 136deg what is the angleof incidence

29 Determine Object Distance You hold anobject in front of a concave mirror witha focal length of 30 cm If you do notsee a reflected image how far from themirror is the object

30 Calculate Speed The speed of light in avacuum is 300000 kms If the index ofrefraction of water is 133 what is thespeed of light in water

More Chapter Review gpesciencecom

1 Which of the following describes the imageformed by a convex mirror

A enlarged

B inverted

C real

D virtual

Use the figure below to answer question 2

2 Which of the following describes a light raythat passes through the focal point andthen is reflected by the mirror

A It travels parallel to the optical axis

B It forms a real image

C It is reflected back through the focal point

D It forms a virtual image

3 Why does an apple look red

A It reflects red light

B It absorbs red light

C It reflects green and blue light

D It reflects all colors of light except red

Use the figure below to answer questions 4 and 5

4 When the primary colors of light are addedtogether what color appears in area H

A cyan

B magenta

C white

D yellow

5 When the primary colors of light are addedtogether what color appears in area G

A cyan

B magenta

C white

D yellow

6 Which of the following increases as the fre-quency of a sound increases

A amplitude

B intensity

C loudness

D pitch

Red Blue

Green

F

H

G K

Focal pointOptical axis

350 STANDARDIZED TEST PRACTICE

Record your answers on the answer sheet provided by your teacher or on a sheet of paper

STANDARDIZED TEST PRACTICE 351

7 Which of the following parts of the eyeenable you to see colors in bright light

A cone cells

B cornea

C lens

D rod cells

Use the graph below to answer questions 8 and 9

8 Determine how far in centimeters theimage is from the lens when the object is15 centimeters from the lens

9 How far in centimeters is the object fromthe lens when the image distance andobject distance are equal

10 A shirt has stripes that are black and whitein white light If green light shines on thisshirt what colors will the black and whitestripes be

11 If you are on a moving train what hap-pens to the pitch of a crossing bell as youapproach the crossing and then moveaway from the crossing

Use the figure below to answer question 12

12 Describe the vision problem show by thefigure and explain how this vision prob-lem can be corrected

13 Explain why the human eye can see colorsbetter in bright light than in dim light

Image Distance fora Convex Lens

Ima

ge

dis

tan

ce (

cm)

30

25

20

15

10

5 10 15 20 25 30

Object distance (cm)

Standardized Test Practice gpesciencecom

Note Units Read carefully and make note of the units used in

any measurement

  • Glencoe Physical Science with Earth Science
    • Student Edition Table of Contents
      • Unit 1 Science and Technology
        • Chapter 1 The Nature of Science
          • Launch Lab Understanding Measurements
          • Foldables
          • Section 1 The Methods of Science
            • Science Online
            • Integrate History
            • Integrate Earth Science
            • Science Online
              • Section 2 Standards of Measurement
                • Applying Math Centimeters
                • Integrate Earth Science
                • Science Online
                • MiniLAB Determining the Density of a Pencil
                • Visualizing SI Dimensions
                  • Section 3 Communicating with Graphs
                    • Applying Math Temperature
                    • MiniLAB Graphing Temperature Change
                    • Lab Whats my graph
                    • Lab Design Your Own - Developing a Measurement System
                    • Science and Language Arts Thinking in Pictures and Other Reports from My Life with Autism
                      • Chapter 1 Study Guide
                      • Chapter 1 Review
                      • Chapter 1 Standardized Test Practice
                        • Chapter 2 Science Technology and Society
                          • Lab Technology in Your Life
                          • Foldables
                          • Section 1 Science and Technology
                            • MiniLAB Researching the Past
                            • Visualizing Technology Supplying Basic Needs
                            • Science Online
                              • Section 2 Forces that Shape Technology
                                • MiniLAB Evaluating the Benefits and Consequences of Technology
                                • Integrate Environment
                                • Integrate History
                                • Applying Science What impact does the accident at Chernobyl have on the future of nuclear power
                                • Science Online
                                • Lab Who contributes CO2
                                  • Section 3 Developing Technology
                                    • Integrate Life Science
                                    • Integrate Career
                                    • Lab Model and Invent - Care Package
                                    • Oops Accidents in Science A Slippery Situation
                                      • Chapter 2 Study Guide
                                      • Chapter 2 Review
                                      • Chapter 2 Standardized Test Practice
                                          • Unit 2 Motion Forces and Energy
                                            • Chapter 3 Motion Acceleration and Forces
                                              • Launch Lab Compare Speeds
                                              • Foldables
                                              • Section 1 Describing Motion
                                                • MiniLAB Measuring Average Speed
                                                • Science Online
                                                • Applying Math Average Speed
                                                • Integrate Astronomy
                                                • Science Online
                                                  • Section 2 Acceleration
                                                    • Integrate History
                                                    • Visualizing Acceleration
                                                      • Section 3 Motion and Forces
                                                        • Science Online
                                                        • MiniLAB Comparing Friction
                                                        • Lab Force and Acceleration
                                                        • Lab Design Your Own - Comparing Motion from Different Forces
                                                        • Science and Language Arts A Brave and Startling Truth
                                                          • Chapter 3 Study Guide
                                                          • Chapter 3 Review
                                                          • Chapter 3 Standardized Test Practice
                                                            • Chapter 4 The Laws of Motion
                                                              • Launch Lab The Force of Gravity
                                                              • Foldables
                                                              • Section 1 The First Two Laws of Motion
                                                                • MiniLAB Observing Inertia
                                                                • Science Online
                                                                • Applying Math The Acceleration of a Sled Solve a Simple Equation
                                                                  • Section 2 Gravity
                                                                    • Science Online
                                                                    • Integrate Earth Science
                                                                    • MiniLAB Observing Centripetal Force
                                                                    • Lab Gravity and Air Resistance
                                                                      • Section 3 The Third Law of Motion
                                                                        • Integrate Career
                                                                        • Visualizing Rocket Motion
                                                                        • Applying Math The Momentum of a Sprinter
                                                                        • Lab The Momentum of Colliding Objects
                                                                        • Science and History Newton and the Plague
                                                                          • Chapter 4 Study Guide
                                                                          • Chapter 4 Review
                                                                          • Chapter 4 Standardized Test Practice
                                                                            • Chapter 5 Energy
                                                                              • Launch Lab Energy Conversions
                                                                              • Foldables
                                                                              • Section 1 The Nature of Energy
                                                                                • Science Online
                                                                                • Applying Math Kinetic Energy
                                                                                • MiniLAB Interpreting Data from a Slingshot
                                                                                • Integrate Language Arts
                                                                                • Applying Math Gravitational Potential Energy
                                                                                • Lab Bouncing Balls
                                                                                  • Section 2 Conservation of Energy
                                                                                    • Visualizing Energy Transformations
                                                                                    • Integrate Environment
                                                                                    • MiniLAB Transforming Energy in a Paper Clip
                                                                                    • Science Online
                                                                                    • Integrate Health
                                                                                    • Lab Design Your Own - Swinging Energy
                                                                                    • Science and History The Impossible Dream
                                                                                      • Chapter 5 Study Guide
                                                                                      • Chapter 5 Review
                                                                                      • Chapter 5 Standardized Test Practice
                                                                                        • Chapter 6 Work and Machines
                                                                                          • Launch Lab Doing Work with a Simple Machine
                                                                                          • Foldables
                                                                                          • Section 1 Work
                                                                                            • Integrate Language Arts
                                                                                            • Applying Math Work
                                                                                            • MiniLAB Calculating Your Work and Power
                                                                                            • Applying Math Power
                                                                                              • Section 2 Using Machines
                                                                                                • MiniLAB Machines Multiplying Force
                                                                                                • Science Online
                                                                                                • Integrate Chemistry
                                                                                                  • Section 3 Simple Machines
                                                                                                    • Integrate History
                                                                                                    • Visualizing Levers in the Human Body
                                                                                                    • Science Online
                                                                                                    • Lab Levers
                                                                                                    • Lab Model and Invent - Using Simple Machines
                                                                                                    • Science and Society The Science of Very Very Small
                                                                                                      • Chapter 6 Study Guide
                                                                                                      • Chapter 6 Review
                                                                                                      • Chapter 6 Standardized Test Practice
                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                          • Launch Lab Relative Sizes of Earth the Moon and the Sun
                                                                                                          • Foldables
                                                                                                          • Section 1 Earth in Space
                                                                                                            • Science Online
                                                                                                            • Integrate Physics
                                                                                                              • Section 2 Time and Seasons
                                                                                                                • MiniLAB Modeling the Suns Rays at Solstice
                                                                                                                • Lab Comparing the Angle of Sunlight to Intensity
                                                                                                                  • Section 3 Earths Moon
                                                                                                                    • Applying Math Tides
                                                                                                                    • MiniLAB Modeling Phases and Eclipses
                                                                                                                    • Integrate History
                                                                                                                    • Integrate History
                                                                                                                    • Science Online
                                                                                                                    • Visualizing Water on the Moon
                                                                                                                    • Lab Identifying the Moons Surface Features and Apollo Landing Sites
                                                                                                                    • Oops Accidents in Science Even Great Scientists Make Mistakes
                                                                                                                      • Chapter 7 Study Guide
                                                                                                                      • Chapter 7 Review
                                                                                                                      • Chapter 7 Standardized Test Practice
                                                                                                                        • Chapter 8 The Solar System
                                                                                                                          • Launch Lab The Size of the Solar System
                                                                                                                          • Foldables
                                                                                                                          • Section 1 Planet Motion
                                                                                                                            • Integrate History
                                                                                                                            • MiniLAB Plotting Retrograde Motion
                                                                                                                            • Integrate Physics
                                                                                                                            • Applying Math Heliocentric Longitude (HL)
                                                                                                                              • Section 2 The Inner Planets
                                                                                                                                • Science Online
                                                                                                                                • Integrate Chemistry
                                                                                                                                • Lab Interpreting Features of Marss Surface
                                                                                                                                  • Section 3 The Outer Planets
                                                                                                                                    • Integrate Language Arts
                                                                                                                                    • Visualizing What Galileo Saw
                                                                                                                                    • Science Online
                                                                                                                                    • MiniLAB Comparing Sizes of Outer and Inner Planets
                                                                                                                                      • Section 4 Life in the Solar System
                                                                                                                                        • Lab Design Your Own - Testing Unknown Soil Samples for Life
                                                                                                                                        • Science Stats Night Sky Wonders
                                                                                                                                          • Chapter 8 Study Guide
                                                                                                                                          • Chapter 8 Review
                                                                                                                                          • Chapter 8 Standardized Test Practice
                                                                                                                                              • Unit 3 Energy in Motion
                                                                                                                                                • Chapter 9 Heat and States of Matter
                                                                                                                                                  • Launch Lab Expansion of a Gas
                                                                                                                                                  • Foldables
                                                                                                                                                  • Section 1 Temperature and Thermal Energy
                                                                                                                                                    • Applying Math Converting to Celsius
                                                                                                                                                    • Science Online
                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                    • Applying Math Change in Thermal Energy
                                                                                                                                                      • Section 2 States of Matter
                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                        • Science Online
                                                                                                                                                        • MiniLAB Comparing States of Water
                                                                                                                                                          • Section 3 Transferring Thermal Energy
                                                                                                                                                            • MiniLAB Comparing Thermal Conductors
                                                                                                                                                            • Visualizing Convection Currents
                                                                                                                                                            • Lab Convection in Gases and Liquids
                                                                                                                                                              • Section 4 Using Thermal Energy
                                                                                                                                                                • Integrate History
                                                                                                                                                                • Science Online
                                                                                                                                                                • Lab Conduction in Gases
                                                                                                                                                                • Science Stats Surprising Thermal Energy
                                                                                                                                                                  • Chapter 9 Study Guide
                                                                                                                                                                  • Chapter 9 Review
                                                                                                                                                                  • Chapter 9 Standardized Test Practice
                                                                                                                                                                    • Chapter 10 Waves
                                                                                                                                                                      • Launch Lab How do waves transfer energy
                                                                                                                                                                      • Foldables
                                                                                                                                                                      • Section 1 The Nature of Waves
                                                                                                                                                                        • Visualizing Formation of Ocean Waves
                                                                                                                                                                        • Science Online
                                                                                                                                                                          • Section 2 Wave Properties
                                                                                                                                                                            • MiniLAB Observing Wavelength
                                                                                                                                                                            • Integrate Social Studies
                                                                                                                                                                            • Applying Math The Speed of Sound
                                                                                                                                                                            • Lab Wave Speed and Tension
                                                                                                                                                                              • Section 3 The Behavior of Waves
                                                                                                                                                                                • Science Online
                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                • MiniLAB Experimenting with Resonance
                                                                                                                                                                                • Lab Measuring Wave Properties
                                                                                                                                                                                • Science and History Making Waves
                                                                                                                                                                                  • Chapter 10 Study Guide
                                                                                                                                                                                  • Chapter 10 Review
                                                                                                                                                                                  • Chapter 10 Standardized Test Practice
                                                                                                                                                                                    • Chapter 11 Sound and Light
                                                                                                                                                                                      • Launch Lab What sound does a ruler make
                                                                                                                                                                                      • Foldables
                                                                                                                                                                                      • Section 1 Sound
                                                                                                                                                                                        • MiniLAB Comparing Intensity
                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                        • Science Online
                                                                                                                                                                                        • Applying Math Using Sonar
                                                                                                                                                                                          • Section 2 Reflection and Refraction of Light
                                                                                                                                                                                          • Section 3 Mirrors Lenses and the Eye
                                                                                                                                                                                            • Visualizing Images Formed by a Convex Lens
                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                            • MiniLAB Experimenting with Focal Lengths
                                                                                                                                                                                            • Lab Reflections of Reflections
                                                                                                                                                                                              • Section 4 Light and Color
                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Lab Design Your Own - Blocking Noise Pollution
                                                                                                                                                                                                • Science and Language Arts A Haiku Garden The Four Seasons in Poems and Print
                                                                                                                                                                                                  • Chapter 11 Study Guide
                                                                                                                                                                                                  • Chapter 11 Review
                                                                                                                                                                                                  • Chapter 11 Standardized Test Practice
                                                                                                                                                                                                    • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                      • Launch Lab Global Jigsaw Puzzle
                                                                                                                                                                                                      • Foldables
                                                                                                                                                                                                      • Section 1 Evolution of Earths Crust
                                                                                                                                                                                                        • Applying Math Spreading Distances
                                                                                                                                                                                                        • Integrate Physics
                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                          • Section 2 Earthquakes
                                                                                                                                                                                                            • MiniLAB Demonstrating Four Types of Stress
                                                                                                                                                                                                            • Visualizing Earthquake-Proof Buildings
                                                                                                                                                                                                              • Section 3 Earths Interior
                                                                                                                                                                                                              • Section 4 Volcanoes
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • MiniLAB Modeling Lava Viscosity
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                • Lab A Case for Pacific Plate Motion
                                                                                                                                                                                                                • Lab Earthquake Earthquake Wheres the earthquake
                                                                                                                                                                                                                • Science and History Volcano Weather
                                                                                                                                                                                                                  • Chapter 12 Study Guide
                                                                                                                                                                                                                  • Chapter 12 Review
                                                                                                                                                                                                                  • Chapter 12 Standardized Test Practice
                                                                                                                                                                                                                      • Unit 4 Forms of Energy
                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                          • Launch Lab Electric Circuits
                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                          • Section 1 Electric Charge
                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                            • Visualizing Lightning
                                                                                                                                                                                                                            • MiniLAB Investigate Charged Objects
                                                                                                                                                                                                                              • Section 2 Electric Current
                                                                                                                                                                                                                                • MiniLAB Investigating Battery Addition
                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                • Lab Identifying Conductors and Insulators
                                                                                                                                                                                                                                  • Section 3 Electrical Energy
                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                    • Applying Math Power Used by a Clothes Dryer
                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                    • Applying Math Electrical Energy Used by a Microwave Oven
                                                                                                                                                                                                                                    • Lab Design Your Own - Comparing Series and Parallel Circuits
                                                                                                                                                                                                                                    • Science and Language Arts Invisible Man
                                                                                                                                                                                                                                      • Chapter 13 Study Guide
                                                                                                                                                                                                                                      • Chapter 13 Review
                                                                                                                                                                                                                                      • Chapter 13 Standardized Test Practice
                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                          • Launch Lab The Strength of Magnets
                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                          • Section 1 Magnetism
                                                                                                                                                                                                                                            • MiniLAB Observing Magnetic Interference
                                                                                                                                                                                                                                            • Integrate Earth Science
                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                            • Applying Science How can magnetic parts of a junk car be salvaged
                                                                                                                                                                                                                                            • MiniLAB Making Your Own Compass
                                                                                                                                                                                                                                              • Section 2 Electricity and Magnetism
                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                  • Section 3 Producing Electric Current
                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                    • Visualizing Motors and Generators
                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                    • Lab Electricity and Magnetism
                                                                                                                                                                                                                                                    • Lab Design Your Own - Controlling Electromagnets
                                                                                                                                                                                                                                                    • Science and History Body Art
                                                                                                                                                                                                                                                      • Chapter 14 Study Guide
                                                                                                                                                                                                                                                      • Chapter 14 Review
                                                                                                                                                                                                                                                      • Chapter 14 Standardized Test Practice
                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                          • Launch Lab Can electromagnetic waves change materials
                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                          • Section 1 What are electromagnetic waves
                                                                                                                                                                                                                                                            • MiniLAB Investigating Electromagnetic Waves
                                                                                                                                                                                                                                                            • Applying Math The Speed of Light in Water
                                                                                                                                                                                                                                                              • Section 2 The Electromagnetic Spectrum
                                                                                                                                                                                                                                                                • MiniLAB Heating with Microwaves
                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                • Lab The Shape of Satellite Dishes
                                                                                                                                                                                                                                                                  • Section 3 Radio Communication
                                                                                                                                                                                                                                                                    • Visualizing Radio Broadcasts
                                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Lab Use the Internet - Radio Frequencies
                                                                                                                                                                                                                                                                    • Science and History Riding a Beam of Light
                                                                                                                                                                                                                                                                      • Chapter 15 Study Guide
                                                                                                                                                                                                                                                                      • Chapter 15 Review
                                                                                                                                                                                                                                                                      • Chapter 15 Standardized Test Practice
                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                          • Launch Lab Heating with Solar Energy
                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                          • Section 1 Fossil Fuels
                                                                                                                                                                                                                                                                            • Visualizing The Formation of Fossil Fuels
                                                                                                                                                                                                                                                                            • MiniLAB Designing an Efficient Water Heater
                                                                                                                                                                                                                                                                              • Section 2 Nuclear Energy
                                                                                                                                                                                                                                                                                • Integrate Earth Science
                                                                                                                                                                                                                                                                                • Integrate Social Science
                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                • Applying Science Can a contaminated radioactive site be reclaimed
                                                                                                                                                                                                                                                                                  • Section 3 Renewable Energy Sources
                                                                                                                                                                                                                                                                                    • MiniLAB Using Solar Power at Home
                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                    • Lab Solar Heating
                                                                                                                                                                                                                                                                                    • Lab Use the Internet How much does energy really cost
                                                                                                                                                                                                                                                                                    • Science and Society Reacting to Nuclear Energy
                                                                                                                                                                                                                                                                                      • Chapter 16 Study Guide
                                                                                                                                                                                                                                                                                      • Chapter 16 Review
                                                                                                                                                                                                                                                                                      • Chapter 16 Standardized Test Practice
                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                          • Lab Atmospheric Pressure
                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                          • Section 1 Earths Atmosphere
                                                                                                                                                                                                                                                                                            • MiniLAB Visualizing Convection
                                                                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                                                                            • Lab Visualizing a Temperature Inversion
                                                                                                                                                                                                                                                                                              • Section 2 Weather
                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Coriolis Effect
                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                  • Section 3 Climate
                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                    • Visualizing Earths Biogeophysical System
                                                                                                                                                                                                                                                                                                      • Section 4 Earths Changing Climates
                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                        • Applying Math Carbon Dioxide (CO2) Concentration
                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Investigating Microclimate
                                                                                                                                                                                                                                                                                                        • Science and Language Arts The Grapes of Wrath
                                                                                                                                                                                                                                                                                                          • Chapter 17 Study Guide
                                                                                                                                                                                                                                                                                                          • Chapter 17 Review
                                                                                                                                                                                                                                                                                                          • Chapter 17 Standardized Test Practice
                                                                                                                                                                                                                                                                                                              • Unit 5 Matter and Earth Materials
                                                                                                                                                                                                                                                                                                                • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                  • Launch Lab Demonstrate the Distillation of Water
                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                  • Section 1 Composition of Matter
                                                                                                                                                                                                                                                                                                                    • Visualizing Elements
                                                                                                                                                                                                                                                                                                                    • MiniLAB Classifying Materials
                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                    • Lab Comparing Pure Substances and Mixtures
                                                                                                                                                                                                                                                                                                                      • Section 2 Properties of Matter
                                                                                                                                                                                                                                                                                                                        • Integrate Environment
                                                                                                                                                                                                                                                                                                                        • MiniLAB Separating Ink
                                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                                        • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                        • Applying Math The Law of Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Measuring the Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Science Stats Intriguing Elements
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Study Guide
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Review
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                            • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                              • Launch Lab Inferring What You Cant Observe
                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                              • Section 1 Structure of the Atom
                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling an Aluminum Atom
                                                                                                                                                                                                                                                                                                                                • Visualizing The Atomic Model
                                                                                                                                                                                                                                                                                                                                  • Section 2 Masses of Atoms
                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                    • Applying Science How can radioactive isotopes help tell time
                                                                                                                                                                                                                                                                                                                                      • Section 3 The Periodic Table
                                                                                                                                                                                                                                                                                                                                        • MiniLAB Organizing a Personal Periodic Table
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Career
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                                                                                                                                                                        • Lab A Periodic Table of Foods
                                                                                                                                                                                                                                                                                                                                        • Lab Use the Internet Whats in a name
                                                                                                                                                                                                                                                                                                                                        • Science and History A Chilling Story
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Study Guide
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Review
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                            • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                              • Launch Lab Earth Materials at Home and School
                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                              • Section 1 Minerals
                                                                                                                                                                                                                                                                                                                                                • MiniLAB Identifying Salts Crystal System
                                                                                                                                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                • Lab Be a Mineral Detective
                                                                                                                                                                                                                                                                                                                                                  • Section 2 Igneous Rocks
                                                                                                                                                                                                                                                                                                                                                    • Applying Math Extrusive Igneous Rock Classification
                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                      • Section 3 Sedimentary Rocks
                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Evaporites
                                                                                                                                                                                                                                                                                                                                                          • Section 4 Metamorphic Rocks and the Rock Cycle
                                                                                                                                                                                                                                                                                                                                                            • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                            • Visualizing Shock Metamorphic Rock
                                                                                                                                                                                                                                                                                                                                                            • Lab Identifying Rocks
                                                                                                                                                                                                                                                                                                                                                            • Science and Society Earth Materials at Work
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Study Guide
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Review
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                  • Launch Lab Have you got the time
                                                                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                                                                  • Section 1 Weathering and Soil
                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing a Disappearing Seasoning
                                                                                                                                                                                                                                                                                                                                                                    • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                    • Lab Graphing Soil Textures
                                                                                                                                                                                                                                                                                                                                                                      • Section 2 Shaping the Landscape
                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Runoff
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                          • Section 3 Groundwater
                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Porosity Volume
                                                                                                                                                                                                                                                                                                                                                                            • Visualizing The Role of Groundwater in Shaping Earths Surface
                                                                                                                                                                                                                                                                                                                                                                            • Integrate Environment
                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                              • Section 4 Geologic Time
                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                                                                                                • Lab Its about time - relative that is
                                                                                                                                                                                                                                                                                                                                                                                • Science and Society Tapping into the Underground
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Review
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                      • Unit 6 Interactions of Matter
                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                          • Lab Chemical Bonds and Mixing
                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Stability in Bonding
                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                            • Lab Atomic Trading Cards
                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Types of Bonds
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Observing a Bond Type
                                                                                                                                                                                                                                                                                                                                                                                                • Visualizing Polar Molecules
                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Writing Formulas and Naming Compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math Determining a Formula
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Science Can you name binary ionic compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Making a Hydrate
                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Model and Invent - Modeling Chemical Bonding
                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Sticky Subject
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Review
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab RustingmdashA Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Chemical Changes
                                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Designing a Team Equation
                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Chemical Equations
                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math Barium Sulfate Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Classifying Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 4 Reaction Rates and Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing Chemical Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Creating a Colorful Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab To Glow or Not to Glow
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Investigating Reaction Conditions
                                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Clumsy Move Pays Off
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Review
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab Magic Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 How Solutions Form
                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                                                                                                                                                                                                                                                            • Visualizing Metal Alloys
                                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Observing the Effect of Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Solubility and Concentration
                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Acids Bases and Salts
                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing Acid Relief
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Strength of Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Determining Acidity
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Saturated Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and Society Acid Rain
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Study Guide
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                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab The Size of a Nucleus
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Strong Force
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Nuclear Decay
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Detecting Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math The Age of Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Social Studies
                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Nuclear Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling a Nuclear Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Visualizing PET Scans
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Chain Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Model and Invent Modeling Transmutations
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and History The Nuclear Alchemist
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Study Guide
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                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 26 Stars and Galaxies
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab Stars in the Sky
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Observing the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling a Telescope
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math The Magnifying Power of Telescopes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Evolution of Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Counting Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing H-R Diagrams of Star Clusters
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Star Cluster Age
                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 3 Galaxies and the Milky Way
                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Study Guide
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 12 Earths Internal Processes
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Page 19: 706 S1 318-326 GPS09 - Light-and-Sound - home · PDF fileWhat sound does a ruler make? ... sound waves cannot travel in empty space where there are no particles. ... sound travels

336 CHAPTER 11 Sound and Light

Brightness and Intensity The human eye can adjust to thebrightness of the light that strikes it If you step outside on asunny day you may have to shade your eyes against the intensityof the sunlight Light intensity is the amount of light energy thatstrikes a certain area each second Brightness is the human per-ception of light intensity Sunlight seems bright because a largeamount of light energy strikes your retina each second Youreyes respond to bright light by decreasing the size of your pupilThis reduces the amount of light that enters your eye and strikesthe retina

Intensity depends on your distance from a light source Ifyou move away from a bare lightbulb you can see how theintensity of the light rapidly decreases Because light rays spreadout from the source less light energy strikes your retina thefarther away you are from the bulb

Correcting Vision ProblemsIf you have good vision you should be able to see objects

clearly when they are 25 cm or farther away from your eyes Asharp image of an object should be formed on your retinaHowever for many people the image is blurry or formed in thewrong place causing vision problems

Farsightedness If you can see distant objects clearly butcanrsquot bring nearby objects into focus then you are farsighted Inthis case the eyeball might be too short or the lens isnrsquot curvedenough to form a sharp image of nearby objects on the retinaas shown in Figure 22 To correct the problem convex lensescan be used to bend incoming light rays so they converge beforethey enter the eye

Experimenting withFocal LengthsProcedure1 Complete the safety form

2 Fill a glass test tube with

water and seal it with a

lid or stopper3 Type or print SULFUR

DIOXIDE in capital letters

on a piece of paper4 Set the test tube horizon-

tally over the words

Record your observations

5 Hold the tube at several

heights above the words

Record your observations

Analysis1 Describe how the words

changed as the height of

the test tube increased

2 Classify the image at each

height as real or virtual

Focal

point

Correctedfarsighted eye

Light fromnearby object

Focalpoint

Light fromnearby object

Farsighted eye

The focal length of a farsighted eye is too long to form

a sharp image of nearby objects on the retina

A convex lens in front of a farsighted eye enables a sharp

image of nearby objects to be formed on the retina

Figure 22 Farsightedness can

be corrected by convex lenses

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SECTION 3 Mirrors Lenses and the Eye 337

Self Check

1 Diagram how light rays from an object are reflected by

a convex mirror to form an image

2 Infer how the size of the image changes if an object

that is less than one focal length from a concave mirror

moves closer to the mirror

3 Explain how the focal length of a convex lens changes

as the sides of the lens become less curved

4 Compare the image of an object less than one focal

length from a convex lens with the image of an object

more than two focal lengths from the lens

5 Think Critically Describe the image formed by a light

source placed at the focal point of a convex lens

Summary

Mirrors

bull A plane mirror forms upright virtual images

bull The image formed by a concave mirror

depends on the location of the object relative

to the focal point

bull Convex mirrors always produce virtual upright

images that are smaller than the object

Lenses

bull The image formed by a convex lens depends

on the distance of the object from the lens

bull Concave lenses always form virtual upright

images that are smaller than the object

The Eye and Vision

bull The eye contains a lens that changes shape to

produce sharp images on the retina

bull Farsightedness occurs when the eye cannot

form a sharp image of nearby objects

Nearsightedness occurs when the eye cannot

form sharp images of distant objects

6 Calculate Object Distance If you looked through a

convex lens with a focal length of 15 cm and saw a

real inverted enlarged image what is the maximum

distance between the lens and the object

Nearsightedness If you have nearsighted friends you knowthat they can see only nearby objects clearly Their eyes cannotform a sharp image on the retina of an object that is far awayInstead the image is formed in front of the retina as shown inFigure 23 To correct this problem a nearsighted person canwear concave lenses Figure 23 shows how a concave lens causesincoming light rays from distant objects to diverge before theyreach the eye Then the rays can be focused by the eye to form asharp image on the retina

Figure 23 Nearsightedness can

be corrected with concave lenses

Focalpoint

Light fromdistant object

Nearsighted eye

Focalpoint

Light fromdistant object

Correctednearsighted eye

When a nearsighted person looks at distant objects a

sharp image is formed in front of the retina

A concave lens in front of a nearsighted eye makes light

rays diverge so a sharp image is formed on the retina

More Section Review gpesciencecom

GPS+_337

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How can you see the back of your head You

can use two mirrors to view a reflection of a

reflection of the back of your head

Real-World ProblemHow many images are seen in two mirrors

Goal Infer how the number of images depends

on the angle between two mirrors

Materialsplane mirrors (2) protractor

masking tape paper clip

Safety Precautions

Handle glass mirrors and paper clips carefully

Procedure1 Complete the safety form

2 Lay one mirror on top of the other with the

mirror surfaces together Tape together one

side so they can open and close Use tape to

label them L and R for left and right

3 Open the mirrors and stand them on a sheet

of paper at an angle of 72deg

4 Bend one leg of a paper clip up 90deg and

place it close to the front of the R mirror

5 Count the number of images of the paper

clip you see in the R and L mirrors Record

these numbers in your data table

6 The mirrors create an image of a circle

divided into wedges Record the number

of wedges

7 Hold the R mirror still and slowly move the Lmirror to 90deg Record the numbers of images

of the clip and wedges in the circle Repeat

this time opening the mirrors to 120deg

Conclude and Apply1 Infer the relationship between the number

of wedges and paper clip images

2 Determine the angle that would divide a

circle into six wedges Hypothesize how

many images would be produced Test your

hypothesis

Reflections of Reflections

Demonstrate for younger students the

relationship between the angle of the

mirrors and the number of reflections

338 CHAPTER 11 Sound and Light

Angle

Number of Number

of Mirrors Paper Clip Images

of Wedges R L

72ordm

90ordm

120ordm

Images and Wedges Seen in the Mirrors

Do not write in this book

SECTION 4 Light and Color 339

Why Objects Have ColorWhy do some apples appear red while others look green or

yellow An objectrsquos color depends on the wavelengths of light itreflects Recall that white light is a blend of all colors of visiblelight When a red apple is struck by white light it reflects redlight back to your eyes and absorbs all of the other colorsFigure 24 shows white light striking a green leaf Only the wave-lengths corresponding to green light are reflected to your eyes

Although some objects appear to be black black isnrsquot acolor Black is the absence of visible light Objects that appearblack absorb all colors of light and reflect little or no light backto your eyes White objects appear to be white because theyreflect all colors of visible light

Why does a white object appear white

Colored Filters Wearing tinted glasses changesthe color of almost everything you see If the lensesare yellow the world takes on a golden glow If theyare rose colored everything looks rosy Somethingsimilar would occur if you placed a colored clearplastic sheet over this white page The paper wouldappear to be the same color as the plastic The plasticsheet and the tinted lenses are filters A filter is atransparent material that transmits one or more col-ors of light but absorbs all others The color of a fil-ter is the color of the light that it transmits

Light and Color

Reading Guide

Explain how you see color Describe the difference between

light color and pigment color Predict what happens when dif-

ferent colors are mixed

From traffic lights to great works of

art color is an important part of your

world

Review Vocabulary

retina inner layer of the eye con-

taining cells that convert light

images into electrical signals

New Vocabulary

bull pigment

Figure 24 This leaf absorbs all

wavelengths of visible light except

the wavelengths you see as green

GPS+_339

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340 CHAPTER 11 Sound and Light

Looking Through Colored Filters Figure 25 shows howthe color of an object can change when you look at it throughvarious colored filters The cooler looks blue under white lightbecause it reflects only the wavelengths of blue light that strikeit If you look at the cooler through a blue filter the cooler stilllooks blue because the blue filter transmits the reflected bluelight However if you look at the cooler through a red filter thecooler seems black because the red filter blocks the blue lightreflected by the cooler

Why does a blue object appear black whenviewed through a red filter

Seeing ColorAs you approach a busy intersection the color of the traffic

light changes from green to yellow to red On the cross street thecolor changes from red to green At a busy intersection trafficsafety depends on your ability to detect color changes rapidlyHow do you see colors

Light and the Eye In a healthy eye light enters the eyethrough the cornea is focused by the lens and finally forms animage on the retina The retina is made up of two types of cellsthat absorb light as shown in Figure 26 When these cellsabsorb light energy chemical reactions convert light energy intonerve impulses that are transmitted to the brain One type ofcell in the retina called a cone enables you to distinguish colorsand detailed shapes of objects Cones need bright light to gener-ate nerve impulses so they do not operate in dim light As aresult even brightly colored objects might look gray or black indim light

Figure 25 The color of this

cooler changes when viewed

through different color filters

Topic Color BlindnessVisit for Web

links to information about the

causes of color blindness

Activity Research the causes

and types of color blindness Find

out how cones are related to the

ability to distinguish colors

gpesciencecom

GPS+_340

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SECTION 4 Light and Color 341

Cones and Rods Your eyes have three types of cones each ofwhich responds to a different range of wavelengths Red conesrespond to mostly red and yellow light Green cones respond tomostly yellow and green light Blue cones respond to mostlyblue and violet light The second type of cell in the retina calleda rod is sensitive to dim light and enables you to see at nightHowever rod cells do not enable you to see colors

Interpreting Color Why does a bananalook yellow The light reflected by the

banana causes the cone cells that are sensitive to red and greenlight to send signals to your brain Your brain could get the samesignal if a mixture of red light and green light reached your eyesThis mixture also would cause your red and green cones torespond and you would see the color yellow As a result lightwith wavelengths corresponding to yellow light and light that isa mixture of red and green light both cause the color yellow tobe seen What happens when you look at a white shirt You seewhite when all wavelengths of visible light enters your eyes Thenall three sets of cones cells send signals to the brain The com-bination of these signals cause you to see the shirt as white

Color Blindness If one or more of your sets of cone cellsdo not function properly you might not be able to distinguishcertain colors This condition is called color blindness orcolor deficiency About eight percent of men and one-halfpercent of women have some form of color blindness Themost common form of color blindness makes it difficult todistinguish between red and green Figure 27 shows an imagethat is used in a test for redndashgreen color blindness Becausered and green are used in traffic signals drivers and pedestri-ans must be able to identify them

Retina

Rod

Cone

Lens

Figure 27 Color blindness is an

inherited sex-linked condition in

which certain sets of cones in the

retina do not function properly

Identify the number that you seein the dots

Figure 26 Light enters the eye

and focuses on the retina The two

types of light-detecting cells

that make up the retina

are called rods and cones

GPS+_341

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342 CHAPTER 11 Sound and Light

Mixing ColorsIf you have ever browsed through a paint store you have

probably seen displays where customers can select paint samplesof almost every imaginable color The colors are a result of mix-tures of pigments For example you might have mixed blue andyellow paint to produce green paint A pigment is a coloredmaterial that is used to change the color of other substancesThe color of a pigment results from the different wavelengths oflight that the pigment reflects

Mixing Colored Lights From the glowing orange of a sun-set to the deep blue of a mountain lake all the colors you see canbe made by mixing three colors of light These three colorsmdashred green and bluemdashare the primary colors of light They cor-respond to the three different types of cones in the retina ofyour eye When mixed together in equal amounts they producewhite light as Figure 28 shows Mixing the primary colors indifferent proportions can produce the colors you see

What are the primary colors of light

Paint Pigments If you were to mix equal amounts of redgreen and blue paint would you get white paint If mixing col-ors of paint were like mixing colors of light you would but mix-ing paint is different Paints are made with pigments Pigmentsproduce color as a result of the wavelengths of light they reflectPaint pigments usually are made of chemical compounds suchas titanium oxide a bright white pigment and lead chromatewhich is used for painting yellow lines on highways

Figure 28 White light is pro-

duced when the three primary col-

ors of light are mixed in equal

amounts

Color for PhotosynthesisPlant pigments determinethe wavelengths oflight for photosynthesisLeaves usually look greenbecause of the pigmentchlorophyll Chlorophyllabsorbs most wave-lengths of visible lightexcept green which itreflects However not allplants are green Researchdifferent plant pigmentsto find out how they allowplant species to survive indiverse habitats

GPS+_342

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SECTION 4 Light and Color 343

Self Check

1 Identity what colors are reflected and what colors are

absorbed if a white light shines on a red shirt

2 Discuss how the primary colors of light differ from the

primary pigment colors

3 Explain why a red apple would appear black if you

looked at it through a blue filter

4 Determine why a white fence appears to be white instead

of multicolored if all colors are present in white light

5 Think Critically Light reflected from an object passes

through a green filter then a red filter and finally a

blue filter What color will the object seem to be

Summary

Why Objects Have Color

bull The color of an object is determined by the

wavelengths of light it reflects

bull The color of a filter is the color of the light the

filter transmits

Seeing Color

bull Rod and cone cells are light-sensitive cells

found in the retina of the human eye

bull Rod cells are sensitive to dim light Cone cells

enable colors to be seen

bull There are three types of cone cells One type

responds to red light another to green light

and another to blue light

Mixing Colors

bull Red green and blue are the primary light

colors Any color of light can be created by

mixing these primary light colors

bull Any pigment color can be formed by mixing

the primary pigment colorsmdashmagenta cyan

and yellow

6 Use Percentages In the human eye there are about

120000000 rods If 90000000 rods trigger at once

what percentage of the total number of rods triggered

7 Convert Units The wavelengths of light are measured

in nanometers (nm) which equals 0000001 mm

Find the wavelength in mm of a light wave that has a

wavelength of 690 nm

Mixing Pigments You can make any pigment color by mixingdifferent amounts of the three primary pigmentsmdashmagenta(bluish red) cyan (greenish blue) and yellow In fact color print-ers use these pigments as well as black ink to make full-colorprints like the pages in this book A primary pigmentrsquos colordepends on the wavelengths of the light that it reflects Actuallypigments both absorb and reflect a range of colors in sending asingle color message to your eye For example in white lightyellow pigment appears yellow because it reflects red and greenlight but absorbs the other wavelengths of visible light The colorof a mixture of two primary pigments is determined by theprimary colors of light that both pigments reflect

Look at Figure 29 The area in the center where the colors alloverlap appears to be black because the three blended primarypigments absorb all the primary colors of light Recall that theprimary colors of light combine to produce white light They arecalled additive colors However when the primary pigment col-ors are combined they absorb all wavelengths of visible light andproduce black Because black results from the absence ofreflected light the primary pigments are called subtractive colors

Figure 29 The three primary

pigment colors appear to be black

when they are mixed

Describe how the primary pigmentcolors are similar to the primary col-ors of light

More Section Review gpesciencecom

GPS+_343

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7230715

eng - iTunNORM 000002A9 00000000 00001B2C 00000000 0000E3C1 00000000 00006099 00000000 00004705 00000000

Design Your OwnDesign Your Own

344

Real-World ProblemWhat loud noises do you enjoy and which ones do you find annoying

Most people enjoy a music concert performed by their favorite artist or

the booming displays of fireworks on the Fourth of July Most people

enjoy these loud sounds for short periods of time However certain

other loud noises such as traffic sirens and loud talking can be

annoying Constant annoying noises are called noise pollution What

can be done to reduce noise pollution What types of barriers will best

block out noise pollution

Form a HypothesisBased on your experiences with loud noises form a hypothesis that

predicts the effectiveness of different types of barriers at blocking out

noise pollution

Test Your HypothesisMake a Plan

1 Complete the safety form

2 Decide what type of barriers or materials you will test

3 Describe exactly how you will use these materials

Goals Design an experiment

that tests the effective-

ness of various types of

barriers and materials

for blocking out noise

pollution

Test different types of

materials and barriers

to determine the best

noise blocks

Possible Materialsradio CD player horn

drum or other loud

noise source

shrubs trees concrete

walls brick walls stone

walls wooden fences

parked cars or hanging

laundry

sound meter

meterstick or metric tape

measure

Blocking NfisePollution

4 Identify the controls and variables you will use in your

experiment

5 List the steps you will use and describe each step precisely

6 Prepare a data table in your Science Journal to record your

measurements

7 Organize the steps of your experiment in logical order

Follow Your Plan

1 Ask your teacher to approve your plan and data table before

you start

2 Conduct your experiment as planned

3 Test each barrier two or three times

4 Record the results from each test in your data table in your Science Journal

Analyze Your Data1 Identify the barriers that most effectively reduced noise pollution

2 Identify the barriers that least effectively reduced noise pollution

3 Compare the effective barriers and identify common characteristics that might

explain why they reduced noise pollution

4 Compare the natural barriers you tested with the artificial barriers Which type

of barrier best reduced noise pollution

5 Compare the different types of materials the barriers were made of Which

type of material best reduced noise pollution

Conclude and Apply1 Evaluate whether your results support your hypothesis

2 Predict how your results would differ if you used a louder source of noise such

as a siren

3 Infer from your results how people living near a

busy street could reduce noise pollution

4 Identify major sources of noise pollution in or

near your home How could they be reduced

5 Research how noise pollution can be

unhealthy

LAB 345

Draw a poster illustrating how builders and

landscapers could use certain materials to

better insulate a home or office from excess

noise pollution

346 CHAPTER 11 Sound and Light

A Haiku GardenThe Four Seasons in Poems and Prints

by Stephen Addiss with Fumiko and Akira Yamamoto

Respond to the Reading1 How do the illustrations help the reader

better understand the poems2 What do you think is meant by the

word lingering in the Haiku about springsunlight

3 Linking Science and Writing Writeone haiku about summer and anotherabout fall In one poem use color tohelp you describe the season In theother use light or some property oflight to help describe the season

Research has deter-mined that there is a

connection between color and mood Warmcolors have longer wavelengths and can bemore stimulating Cool colors which haveshorter wavelengths tend to have a calmingor soothing effect on people Light and colorhave long been used as literary symbols Doesthe use of color change what you imaginewhen you read the haiku

UnderstandingLiteratureJapanese Haiku A haiku is a verse thatconsists of three lines and 17 syllables inthe Japanese language The first and thirdlines have five syllables each and themiddle line has seven syllables Why isimagination important in reading haiku

Lingering

in every pool of watermdash

spring sunlightIssa

Withered by winter

the sound of the windmdash

one-color worldBasho

Sound

1 Sound waves are compressional waves thattravel only in matter

2 The speed of sound in a material dependson the type of material as well as itstemperature

3 Loudness depends on a sound waversquos inten-sity Pitch depends on a sound waversquosfrequency

4 Sound waves are used in echolocationsonar and medical imaging

Reflection and Refractionof Light

1 Light can be absorbed reflected or trans-mitted by a material

2 When light waves are reflected theyobey the law of reflectionmdashthe angle ofincidence equals the angle of reflection

3 A light wave is refracted or bent whenit changes speed as it travels at an anglefrom one material to another

Mirrors Lenses andthe Eye

1 Plane mirrors form upright virtual images

2 Images formed by concave mirrors andconvex lenses depend on the location ofthe object relative to the focal point

3 Convex mirrors and concave lenses formvirtual upright images that are smallerthan the object

4 The lens in the human eye changes shape toproduce a sharp image on the retina

Light and Color

1 You see color when light is reflected offobjects and into your eyes

2 Cone cells in the retina are light-sensitivecells that enable you to distinguish colors

3 Red blue and green are the three primarycolors of light and can be mixed to form allother colors

4 The primary pigment colors are magentacyan and yellow

CHAPTER STUDY GUIDE 347

Use the Foldable you made at the beginningof the chapter to help you review sound and light

Interactive Tutor gpesciencecom

Complete each statement with the correctvocabulary word or phrase

1 A change in frequency due to a movingsound source is due to the

2 A flat smooth surface that reflects light andforms an image is a(n)

3 An object is if you can seethrough it clearly

4 The of a material indicates howmuch the speed of light in the materialchanges as light passes through

5 You can change the color of white paint byadding a(n) to it

6 A(n) is a reflecting surface thatcurves outward like the back of a spoon

7 The human perception of the intensity of asound wave is

Choose the word or phrase that best answerseach question

8 Which of the following best describes imageformation by a plane mirrorA) A real image is formed in front of the mirrorB) A real image is formed behind the mirrorC) A virtual image is formed in front of the

mirrorD) A virtual image is formed behind the mirror

9 For a sound with low pitch what else isalso always lowA) amplitude C) wavelengthB) frequency D) wave velocity

10 Which of the following occurs when asound source moves away from youA) The soundrsquos velocity decreasesB) The soundrsquos loudness increasesC) The soundrsquos frequency decreasesD) The soundrsquos frequency increases

Use the table below to answer question 11

11 Based on the data in the table abovewhich of the following would be the speedof sound in air at 30degCA) 3404 ms C) 3494 msB) 3464 ms D) 3534 ms

12 What happens to a light ray travelingparallel to the optical axis of a convexlens that passes through the lensA) It travels parallel to the optical axisB) It passes through the focal pointC) It is bent away from the optical axisD) It forms a virtual image

13 Light waves of which color are bent mostwhen passing through a prismA) blue C) violetB) red D) yellow

14 Which way does a concave lens bend lightA) toward its optical axisB) toward its centerC) toward its edgesD) toward its focal point

Speed of Sound in Air

Temp peed( s)

4

4

4

348 CHAPTER REVIEW

concave lens p 335concave mirror p 332convex lens p 333convex mirror p 333decibel p 322Doppler effect p 323index of refraction p 329intensity p 322

loudness p 322opaque p 327pigment p 342pitch p 323plane mirror p 331translucent p 327transparent p 327

Vocabulary PuzzleMaker gpesciencecom

Use the illustration below to answer question 15

15 Describe how the position of the candlechanged if the image of the candle movedaway from the focal point

16 Apply Acoustic scientists sometimes doresearch in rooms that absorb all soundwaves How could such a room be used tostudy how bats find their food

17 Compare White light passes through atranslucent pane of glass and shines on ashirt Both the translucent glass and theshirt appear green Compare the colors oflight that are absorbed and transmitted bythe glass and the shirt

18 Infer Most mammals including dogs andcats canrsquot see colors Infer how the retinaof a catrsquos eye might be different from theretina of a human eye

19 Determine whether a convex lens could forman image that is enlarged real and upright

20 Infer A car comes to a railroad crossingThe driver hears a trainrsquos whistle and itspitch becomes lower What can beassumed about how the train is moving

21 Compare and contrast the reflection of lightfrom a white wall with a rough surfacewith the reflection of light from a mirror

Optical axis

One

focal

length

Two

focal

lengths

Image

Ray A

Object

Focal

point

Interpreting Graphics 22 Infer why a convex mirror and a concavelens can never produce a real image

23 Predict what color a white shirt wouldappear to be if the light reflected from theshirt passed through a red filter and thenthrough a green filter

24 Explain why windows might begin to rattlewhen an airplane flies overhead

25 Communicate Some people enjoy usingsnowmobiles Others object to the noisethat they make Write a proposal for a pol-icy that seems fair to both groups for theuse of snowmobiles in a state park

CHAPTER REVIEW 349

Use the wave speed equation ν ƒλ to answer

questions 26 and 27

26 Calculate Frequency A sonar pulse has awavelength of 30 cm and a speed inwater of 1500 ms Find its frequency

27 Calculate Wavelength What is the wave-length of a sound wave with a fre-quency of 440 Hz if the speed of soundin air is 340 ms

28 Calculate Angle of Incidence A light ray isreflected from a mirror If the anglebetween the incident ray and thereflected ray is 136deg what is the angleof incidence

29 Determine Object Distance You hold anobject in front of a concave mirror witha focal length of 30 cm If you do notsee a reflected image how far from themirror is the object

30 Calculate Speed The speed of light in avacuum is 300000 kms If the index ofrefraction of water is 133 what is thespeed of light in water

More Chapter Review gpesciencecom

1 Which of the following describes the imageformed by a convex mirror

A enlarged

B inverted

C real

D virtual

Use the figure below to answer question 2

2 Which of the following describes a light raythat passes through the focal point andthen is reflected by the mirror

A It travels parallel to the optical axis

B It forms a real image

C It is reflected back through the focal point

D It forms a virtual image

3 Why does an apple look red

A It reflects red light

B It absorbs red light

C It reflects green and blue light

D It reflects all colors of light except red

Use the figure below to answer questions 4 and 5

4 When the primary colors of light are addedtogether what color appears in area H

A cyan

B magenta

C white

D yellow

5 When the primary colors of light are addedtogether what color appears in area G

A cyan

B magenta

C white

D yellow

6 Which of the following increases as the fre-quency of a sound increases

A amplitude

B intensity

C loudness

D pitch

Red Blue

Green

F

H

G K

Focal pointOptical axis

350 STANDARDIZED TEST PRACTICE

Record your answers on the answer sheet provided by your teacher or on a sheet of paper

STANDARDIZED TEST PRACTICE 351

7 Which of the following parts of the eyeenable you to see colors in bright light

A cone cells

B cornea

C lens

D rod cells

Use the graph below to answer questions 8 and 9

8 Determine how far in centimeters theimage is from the lens when the object is15 centimeters from the lens

9 How far in centimeters is the object fromthe lens when the image distance andobject distance are equal

10 A shirt has stripes that are black and whitein white light If green light shines on thisshirt what colors will the black and whitestripes be

11 If you are on a moving train what hap-pens to the pitch of a crossing bell as youapproach the crossing and then moveaway from the crossing

Use the figure below to answer question 12

12 Describe the vision problem show by thefigure and explain how this vision prob-lem can be corrected

13 Explain why the human eye can see colorsbetter in bright light than in dim light

Image Distance fora Convex Lens

Ima

ge

dis

tan

ce (

cm)

30

25

20

15

10

5 10 15 20 25 30

Object distance (cm)

Standardized Test Practice gpesciencecom

Note Units Read carefully and make note of the units used in

any measurement

  • Glencoe Physical Science with Earth Science
    • Student Edition Table of Contents
      • Unit 1 Science and Technology
        • Chapter 1 The Nature of Science
          • Launch Lab Understanding Measurements
          • Foldables
          • Section 1 The Methods of Science
            • Science Online
            • Integrate History
            • Integrate Earth Science
            • Science Online
              • Section 2 Standards of Measurement
                • Applying Math Centimeters
                • Integrate Earth Science
                • Science Online
                • MiniLAB Determining the Density of a Pencil
                • Visualizing SI Dimensions
                  • Section 3 Communicating with Graphs
                    • Applying Math Temperature
                    • MiniLAB Graphing Temperature Change
                    • Lab Whats my graph
                    • Lab Design Your Own - Developing a Measurement System
                    • Science and Language Arts Thinking in Pictures and Other Reports from My Life with Autism
                      • Chapter 1 Study Guide
                      • Chapter 1 Review
                      • Chapter 1 Standardized Test Practice
                        • Chapter 2 Science Technology and Society
                          • Lab Technology in Your Life
                          • Foldables
                          • Section 1 Science and Technology
                            • MiniLAB Researching the Past
                            • Visualizing Technology Supplying Basic Needs
                            • Science Online
                              • Section 2 Forces that Shape Technology
                                • MiniLAB Evaluating the Benefits and Consequences of Technology
                                • Integrate Environment
                                • Integrate History
                                • Applying Science What impact does the accident at Chernobyl have on the future of nuclear power
                                • Science Online
                                • Lab Who contributes CO2
                                  • Section 3 Developing Technology
                                    • Integrate Life Science
                                    • Integrate Career
                                    • Lab Model and Invent - Care Package
                                    • Oops Accidents in Science A Slippery Situation
                                      • Chapter 2 Study Guide
                                      • Chapter 2 Review
                                      • Chapter 2 Standardized Test Practice
                                          • Unit 2 Motion Forces and Energy
                                            • Chapter 3 Motion Acceleration and Forces
                                              • Launch Lab Compare Speeds
                                              • Foldables
                                              • Section 1 Describing Motion
                                                • MiniLAB Measuring Average Speed
                                                • Science Online
                                                • Applying Math Average Speed
                                                • Integrate Astronomy
                                                • Science Online
                                                  • Section 2 Acceleration
                                                    • Integrate History
                                                    • Visualizing Acceleration
                                                      • Section 3 Motion and Forces
                                                        • Science Online
                                                        • MiniLAB Comparing Friction
                                                        • Lab Force and Acceleration
                                                        • Lab Design Your Own - Comparing Motion from Different Forces
                                                        • Science and Language Arts A Brave and Startling Truth
                                                          • Chapter 3 Study Guide
                                                          • Chapter 3 Review
                                                          • Chapter 3 Standardized Test Practice
                                                            • Chapter 4 The Laws of Motion
                                                              • Launch Lab The Force of Gravity
                                                              • Foldables
                                                              • Section 1 The First Two Laws of Motion
                                                                • MiniLAB Observing Inertia
                                                                • Science Online
                                                                • Applying Math The Acceleration of a Sled Solve a Simple Equation
                                                                  • Section 2 Gravity
                                                                    • Science Online
                                                                    • Integrate Earth Science
                                                                    • MiniLAB Observing Centripetal Force
                                                                    • Lab Gravity and Air Resistance
                                                                      • Section 3 The Third Law of Motion
                                                                        • Integrate Career
                                                                        • Visualizing Rocket Motion
                                                                        • Applying Math The Momentum of a Sprinter
                                                                        • Lab The Momentum of Colliding Objects
                                                                        • Science and History Newton and the Plague
                                                                          • Chapter 4 Study Guide
                                                                          • Chapter 4 Review
                                                                          • Chapter 4 Standardized Test Practice
                                                                            • Chapter 5 Energy
                                                                              • Launch Lab Energy Conversions
                                                                              • Foldables
                                                                              • Section 1 The Nature of Energy
                                                                                • Science Online
                                                                                • Applying Math Kinetic Energy
                                                                                • MiniLAB Interpreting Data from a Slingshot
                                                                                • Integrate Language Arts
                                                                                • Applying Math Gravitational Potential Energy
                                                                                • Lab Bouncing Balls
                                                                                  • Section 2 Conservation of Energy
                                                                                    • Visualizing Energy Transformations
                                                                                    • Integrate Environment
                                                                                    • MiniLAB Transforming Energy in a Paper Clip
                                                                                    • Science Online
                                                                                    • Integrate Health
                                                                                    • Lab Design Your Own - Swinging Energy
                                                                                    • Science and History The Impossible Dream
                                                                                      • Chapter 5 Study Guide
                                                                                      • Chapter 5 Review
                                                                                      • Chapter 5 Standardized Test Practice
                                                                                        • Chapter 6 Work and Machines
                                                                                          • Launch Lab Doing Work with a Simple Machine
                                                                                          • Foldables
                                                                                          • Section 1 Work
                                                                                            • Integrate Language Arts
                                                                                            • Applying Math Work
                                                                                            • MiniLAB Calculating Your Work and Power
                                                                                            • Applying Math Power
                                                                                              • Section 2 Using Machines
                                                                                                • MiniLAB Machines Multiplying Force
                                                                                                • Science Online
                                                                                                • Integrate Chemistry
                                                                                                  • Section 3 Simple Machines
                                                                                                    • Integrate History
                                                                                                    • Visualizing Levers in the Human Body
                                                                                                    • Science Online
                                                                                                    • Lab Levers
                                                                                                    • Lab Model and Invent - Using Simple Machines
                                                                                                    • Science and Society The Science of Very Very Small
                                                                                                      • Chapter 6 Study Guide
                                                                                                      • Chapter 6 Review
                                                                                                      • Chapter 6 Standardized Test Practice
                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                          • Launch Lab Relative Sizes of Earth the Moon and the Sun
                                                                                                          • Foldables
                                                                                                          • Section 1 Earth in Space
                                                                                                            • Science Online
                                                                                                            • Integrate Physics
                                                                                                              • Section 2 Time and Seasons
                                                                                                                • MiniLAB Modeling the Suns Rays at Solstice
                                                                                                                • Lab Comparing the Angle of Sunlight to Intensity
                                                                                                                  • Section 3 Earths Moon
                                                                                                                    • Applying Math Tides
                                                                                                                    • MiniLAB Modeling Phases and Eclipses
                                                                                                                    • Integrate History
                                                                                                                    • Integrate History
                                                                                                                    • Science Online
                                                                                                                    • Visualizing Water on the Moon
                                                                                                                    • Lab Identifying the Moons Surface Features and Apollo Landing Sites
                                                                                                                    • Oops Accidents in Science Even Great Scientists Make Mistakes
                                                                                                                      • Chapter 7 Study Guide
                                                                                                                      • Chapter 7 Review
                                                                                                                      • Chapter 7 Standardized Test Practice
                                                                                                                        • Chapter 8 The Solar System
                                                                                                                          • Launch Lab The Size of the Solar System
                                                                                                                          • Foldables
                                                                                                                          • Section 1 Planet Motion
                                                                                                                            • Integrate History
                                                                                                                            • MiniLAB Plotting Retrograde Motion
                                                                                                                            • Integrate Physics
                                                                                                                            • Applying Math Heliocentric Longitude (HL)
                                                                                                                              • Section 2 The Inner Planets
                                                                                                                                • Science Online
                                                                                                                                • Integrate Chemistry
                                                                                                                                • Lab Interpreting Features of Marss Surface
                                                                                                                                  • Section 3 The Outer Planets
                                                                                                                                    • Integrate Language Arts
                                                                                                                                    • Visualizing What Galileo Saw
                                                                                                                                    • Science Online
                                                                                                                                    • MiniLAB Comparing Sizes of Outer and Inner Planets
                                                                                                                                      • Section 4 Life in the Solar System
                                                                                                                                        • Lab Design Your Own - Testing Unknown Soil Samples for Life
                                                                                                                                        • Science Stats Night Sky Wonders
                                                                                                                                          • Chapter 8 Study Guide
                                                                                                                                          • Chapter 8 Review
                                                                                                                                          • Chapter 8 Standardized Test Practice
                                                                                                                                              • Unit 3 Energy in Motion
                                                                                                                                                • Chapter 9 Heat and States of Matter
                                                                                                                                                  • Launch Lab Expansion of a Gas
                                                                                                                                                  • Foldables
                                                                                                                                                  • Section 1 Temperature and Thermal Energy
                                                                                                                                                    • Applying Math Converting to Celsius
                                                                                                                                                    • Science Online
                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                    • Applying Math Change in Thermal Energy
                                                                                                                                                      • Section 2 States of Matter
                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                        • Science Online
                                                                                                                                                        • MiniLAB Comparing States of Water
                                                                                                                                                          • Section 3 Transferring Thermal Energy
                                                                                                                                                            • MiniLAB Comparing Thermal Conductors
                                                                                                                                                            • Visualizing Convection Currents
                                                                                                                                                            • Lab Convection in Gases and Liquids
                                                                                                                                                              • Section 4 Using Thermal Energy
                                                                                                                                                                • Integrate History
                                                                                                                                                                • Science Online
                                                                                                                                                                • Lab Conduction in Gases
                                                                                                                                                                • Science Stats Surprising Thermal Energy
                                                                                                                                                                  • Chapter 9 Study Guide
                                                                                                                                                                  • Chapter 9 Review
                                                                                                                                                                  • Chapter 9 Standardized Test Practice
                                                                                                                                                                    • Chapter 10 Waves
                                                                                                                                                                      • Launch Lab How do waves transfer energy
                                                                                                                                                                      • Foldables
                                                                                                                                                                      • Section 1 The Nature of Waves
                                                                                                                                                                        • Visualizing Formation of Ocean Waves
                                                                                                                                                                        • Science Online
                                                                                                                                                                          • Section 2 Wave Properties
                                                                                                                                                                            • MiniLAB Observing Wavelength
                                                                                                                                                                            • Integrate Social Studies
                                                                                                                                                                            • Applying Math The Speed of Sound
                                                                                                                                                                            • Lab Wave Speed and Tension
                                                                                                                                                                              • Section 3 The Behavior of Waves
                                                                                                                                                                                • Science Online
                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                • MiniLAB Experimenting with Resonance
                                                                                                                                                                                • Lab Measuring Wave Properties
                                                                                                                                                                                • Science and History Making Waves
                                                                                                                                                                                  • Chapter 10 Study Guide
                                                                                                                                                                                  • Chapter 10 Review
                                                                                                                                                                                  • Chapter 10 Standardized Test Practice
                                                                                                                                                                                    • Chapter 11 Sound and Light
                                                                                                                                                                                      • Launch Lab What sound does a ruler make
                                                                                                                                                                                      • Foldables
                                                                                                                                                                                      • Section 1 Sound
                                                                                                                                                                                        • MiniLAB Comparing Intensity
                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                        • Science Online
                                                                                                                                                                                        • Applying Math Using Sonar
                                                                                                                                                                                          • Section 2 Reflection and Refraction of Light
                                                                                                                                                                                          • Section 3 Mirrors Lenses and the Eye
                                                                                                                                                                                            • Visualizing Images Formed by a Convex Lens
                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                            • MiniLAB Experimenting with Focal Lengths
                                                                                                                                                                                            • Lab Reflections of Reflections
                                                                                                                                                                                              • Section 4 Light and Color
                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Lab Design Your Own - Blocking Noise Pollution
                                                                                                                                                                                                • Science and Language Arts A Haiku Garden The Four Seasons in Poems and Print
                                                                                                                                                                                                  • Chapter 11 Study Guide
                                                                                                                                                                                                  • Chapter 11 Review
                                                                                                                                                                                                  • Chapter 11 Standardized Test Practice
                                                                                                                                                                                                    • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                      • Launch Lab Global Jigsaw Puzzle
                                                                                                                                                                                                      • Foldables
                                                                                                                                                                                                      • Section 1 Evolution of Earths Crust
                                                                                                                                                                                                        • Applying Math Spreading Distances
                                                                                                                                                                                                        • Integrate Physics
                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                          • Section 2 Earthquakes
                                                                                                                                                                                                            • MiniLAB Demonstrating Four Types of Stress
                                                                                                                                                                                                            • Visualizing Earthquake-Proof Buildings
                                                                                                                                                                                                              • Section 3 Earths Interior
                                                                                                                                                                                                              • Section 4 Volcanoes
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • MiniLAB Modeling Lava Viscosity
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                • Lab A Case for Pacific Plate Motion
                                                                                                                                                                                                                • Lab Earthquake Earthquake Wheres the earthquake
                                                                                                                                                                                                                • Science and History Volcano Weather
                                                                                                                                                                                                                  • Chapter 12 Study Guide
                                                                                                                                                                                                                  • Chapter 12 Review
                                                                                                                                                                                                                  • Chapter 12 Standardized Test Practice
                                                                                                                                                                                                                      • Unit 4 Forms of Energy
                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                          • Launch Lab Electric Circuits
                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                          • Section 1 Electric Charge
                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                            • Visualizing Lightning
                                                                                                                                                                                                                            • MiniLAB Investigate Charged Objects
                                                                                                                                                                                                                              • Section 2 Electric Current
                                                                                                                                                                                                                                • MiniLAB Investigating Battery Addition
                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                • Lab Identifying Conductors and Insulators
                                                                                                                                                                                                                                  • Section 3 Electrical Energy
                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                    • Applying Math Power Used by a Clothes Dryer
                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                    • Applying Math Electrical Energy Used by a Microwave Oven
                                                                                                                                                                                                                                    • Lab Design Your Own - Comparing Series and Parallel Circuits
                                                                                                                                                                                                                                    • Science and Language Arts Invisible Man
                                                                                                                                                                                                                                      • Chapter 13 Study Guide
                                                                                                                                                                                                                                      • Chapter 13 Review
                                                                                                                                                                                                                                      • Chapter 13 Standardized Test Practice
                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                          • Launch Lab The Strength of Magnets
                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                          • Section 1 Magnetism
                                                                                                                                                                                                                                            • MiniLAB Observing Magnetic Interference
                                                                                                                                                                                                                                            • Integrate Earth Science
                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                            • Applying Science How can magnetic parts of a junk car be salvaged
                                                                                                                                                                                                                                            • MiniLAB Making Your Own Compass
                                                                                                                                                                                                                                              • Section 2 Electricity and Magnetism
                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                  • Section 3 Producing Electric Current
                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                    • Visualizing Motors and Generators
                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                    • Lab Electricity and Magnetism
                                                                                                                                                                                                                                                    • Lab Design Your Own - Controlling Electromagnets
                                                                                                                                                                                                                                                    • Science and History Body Art
                                                                                                                                                                                                                                                      • Chapter 14 Study Guide
                                                                                                                                                                                                                                                      • Chapter 14 Review
                                                                                                                                                                                                                                                      • Chapter 14 Standardized Test Practice
                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                          • Launch Lab Can electromagnetic waves change materials
                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                          • Section 1 What are electromagnetic waves
                                                                                                                                                                                                                                                            • MiniLAB Investigating Electromagnetic Waves
                                                                                                                                                                                                                                                            • Applying Math The Speed of Light in Water
                                                                                                                                                                                                                                                              • Section 2 The Electromagnetic Spectrum
                                                                                                                                                                                                                                                                • MiniLAB Heating with Microwaves
                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                • Lab The Shape of Satellite Dishes
                                                                                                                                                                                                                                                                  • Section 3 Radio Communication
                                                                                                                                                                                                                                                                    • Visualizing Radio Broadcasts
                                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Lab Use the Internet - Radio Frequencies
                                                                                                                                                                                                                                                                    • Science and History Riding a Beam of Light
                                                                                                                                                                                                                                                                      • Chapter 15 Study Guide
                                                                                                                                                                                                                                                                      • Chapter 15 Review
                                                                                                                                                                                                                                                                      • Chapter 15 Standardized Test Practice
                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                          • Launch Lab Heating with Solar Energy
                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                          • Section 1 Fossil Fuels
                                                                                                                                                                                                                                                                            • Visualizing The Formation of Fossil Fuels
                                                                                                                                                                                                                                                                            • MiniLAB Designing an Efficient Water Heater
                                                                                                                                                                                                                                                                              • Section 2 Nuclear Energy
                                                                                                                                                                                                                                                                                • Integrate Earth Science
                                                                                                                                                                                                                                                                                • Integrate Social Science
                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                • Applying Science Can a contaminated radioactive site be reclaimed
                                                                                                                                                                                                                                                                                  • Section 3 Renewable Energy Sources
                                                                                                                                                                                                                                                                                    • MiniLAB Using Solar Power at Home
                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                    • Lab Solar Heating
                                                                                                                                                                                                                                                                                    • Lab Use the Internet How much does energy really cost
                                                                                                                                                                                                                                                                                    • Science and Society Reacting to Nuclear Energy
                                                                                                                                                                                                                                                                                      • Chapter 16 Study Guide
                                                                                                                                                                                                                                                                                      • Chapter 16 Review
                                                                                                                                                                                                                                                                                      • Chapter 16 Standardized Test Practice
                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                          • Lab Atmospheric Pressure
                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                          • Section 1 Earths Atmosphere
                                                                                                                                                                                                                                                                                            • MiniLAB Visualizing Convection
                                                                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                                                                            • Lab Visualizing a Temperature Inversion
                                                                                                                                                                                                                                                                                              • Section 2 Weather
                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Coriolis Effect
                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                  • Section 3 Climate
                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                    • Visualizing Earths Biogeophysical System
                                                                                                                                                                                                                                                                                                      • Section 4 Earths Changing Climates
                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                        • Applying Math Carbon Dioxide (CO2) Concentration
                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Investigating Microclimate
                                                                                                                                                                                                                                                                                                        • Science and Language Arts The Grapes of Wrath
                                                                                                                                                                                                                                                                                                          • Chapter 17 Study Guide
                                                                                                                                                                                                                                                                                                          • Chapter 17 Review
                                                                                                                                                                                                                                                                                                          • Chapter 17 Standardized Test Practice
                                                                                                                                                                                                                                                                                                              • Unit 5 Matter and Earth Materials
                                                                                                                                                                                                                                                                                                                • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                  • Launch Lab Demonstrate the Distillation of Water
                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                  • Section 1 Composition of Matter
                                                                                                                                                                                                                                                                                                                    • Visualizing Elements
                                                                                                                                                                                                                                                                                                                    • MiniLAB Classifying Materials
                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                    • Lab Comparing Pure Substances and Mixtures
                                                                                                                                                                                                                                                                                                                      • Section 2 Properties of Matter
                                                                                                                                                                                                                                                                                                                        • Integrate Environment
                                                                                                                                                                                                                                                                                                                        • MiniLAB Separating Ink
                                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                                        • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                        • Applying Math The Law of Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Measuring the Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Science Stats Intriguing Elements
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Study Guide
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Review
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                            • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                              • Launch Lab Inferring What You Cant Observe
                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                              • Section 1 Structure of the Atom
                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling an Aluminum Atom
                                                                                                                                                                                                                                                                                                                                • Visualizing The Atomic Model
                                                                                                                                                                                                                                                                                                                                  • Section 2 Masses of Atoms
                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                    • Applying Science How can radioactive isotopes help tell time
                                                                                                                                                                                                                                                                                                                                      • Section 3 The Periodic Table
                                                                                                                                                                                                                                                                                                                                        • MiniLAB Organizing a Personal Periodic Table
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Career
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                                                                                                                                                                        • Lab A Periodic Table of Foods
                                                                                                                                                                                                                                                                                                                                        • Lab Use the Internet Whats in a name
                                                                                                                                                                                                                                                                                                                                        • Science and History A Chilling Story
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Study Guide
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Review
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                            • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                              • Launch Lab Earth Materials at Home and School
                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                              • Section 1 Minerals
                                                                                                                                                                                                                                                                                                                                                • MiniLAB Identifying Salts Crystal System
                                                                                                                                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                • Lab Be a Mineral Detective
                                                                                                                                                                                                                                                                                                                                                  • Section 2 Igneous Rocks
                                                                                                                                                                                                                                                                                                                                                    • Applying Math Extrusive Igneous Rock Classification
                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                      • Section 3 Sedimentary Rocks
                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Evaporites
                                                                                                                                                                                                                                                                                                                                                          • Section 4 Metamorphic Rocks and the Rock Cycle
                                                                                                                                                                                                                                                                                                                                                            • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                            • Visualizing Shock Metamorphic Rock
                                                                                                                                                                                                                                                                                                                                                            • Lab Identifying Rocks
                                                                                                                                                                                                                                                                                                                                                            • Science and Society Earth Materials at Work
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Study Guide
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Review
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                  • Launch Lab Have you got the time
                                                                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                                                                  • Section 1 Weathering and Soil
                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing a Disappearing Seasoning
                                                                                                                                                                                                                                                                                                                                                                    • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                    • Lab Graphing Soil Textures
                                                                                                                                                                                                                                                                                                                                                                      • Section 2 Shaping the Landscape
                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Runoff
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                          • Section 3 Groundwater
                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Porosity Volume
                                                                                                                                                                                                                                                                                                                                                                            • Visualizing The Role of Groundwater in Shaping Earths Surface
                                                                                                                                                                                                                                                                                                                                                                            • Integrate Environment
                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                              • Section 4 Geologic Time
                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                                                                                                • Lab Its about time - relative that is
                                                                                                                                                                                                                                                                                                                                                                                • Science and Society Tapping into the Underground
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Review
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                      • Unit 6 Interactions of Matter
                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                          • Lab Chemical Bonds and Mixing
                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Stability in Bonding
                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                            • Lab Atomic Trading Cards
                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Types of Bonds
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Observing a Bond Type
                                                                                                                                                                                                                                                                                                                                                                                                • Visualizing Polar Molecules
                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Writing Formulas and Naming Compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math Determining a Formula
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Science Can you name binary ionic compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Making a Hydrate
                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Model and Invent - Modeling Chemical Bonding
                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Sticky Subject
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Review
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab RustingmdashA Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Chemical Changes
                                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Designing a Team Equation
                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Chemical Equations
                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math Barium Sulfate Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Classifying Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 4 Reaction Rates and Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing Chemical Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Creating a Colorful Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab To Glow or Not to Glow
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Investigating Reaction Conditions
                                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Clumsy Move Pays Off
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Review
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab Magic Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 How Solutions Form
                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                                                                                                                                                                                                                                                            • Visualizing Metal Alloys
                                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Observing the Effect of Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Solubility and Concentration
                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Acids Bases and Salts
                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing Acid Relief
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Strength of Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Determining Acidity
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Saturated Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and Society Acid Rain
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab The Size of a Nucleus
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Strong Force
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Nuclear Decay
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Detecting Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math The Age of Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Social Studies
                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Nuclear Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling a Nuclear Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Visualizing PET Scans
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Chain Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Model and Invent Modeling Transmutations
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and History The Nuclear Alchemist
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 26 Stars and Galaxies
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab Stars in the Sky
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Observing the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling a Telescope
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math The Magnifying Power of Telescopes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Evolution of Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Counting Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing H-R Diagrams of Star Clusters
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Star Cluster Age
                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 3 Galaxies and the Milky Way
                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 4 Cosmology
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Lab Model and Invent - Expansion of the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Science and Language Arts Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Standardized Test Practice
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Extra Math Problems
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 1 The Nature of Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 2 Science Technology and Society
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 3 Motion Acceleration and Forces
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 4 The Laws of Motion
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 5 Energy
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 6 Work and Machines
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 8 The Solar System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 9 Heat and States of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 10 Waves
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 11 Sound and Light
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 25 Nuclear Changes
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Page 20: 706 S1 318-326 GPS09 - Light-and-Sound - home · PDF fileWhat sound does a ruler make? ... sound waves cannot travel in empty space where there are no particles. ... sound travels

SECTION 3 Mirrors Lenses and the Eye 337

Self Check

1 Diagram how light rays from an object are reflected by

a convex mirror to form an image

2 Infer how the size of the image changes if an object

that is less than one focal length from a concave mirror

moves closer to the mirror

3 Explain how the focal length of a convex lens changes

as the sides of the lens become less curved

4 Compare the image of an object less than one focal

length from a convex lens with the image of an object

more than two focal lengths from the lens

5 Think Critically Describe the image formed by a light

source placed at the focal point of a convex lens

Summary

Mirrors

bull A plane mirror forms upright virtual images

bull The image formed by a concave mirror

depends on the location of the object relative

to the focal point

bull Convex mirrors always produce virtual upright

images that are smaller than the object

Lenses

bull The image formed by a convex lens depends

on the distance of the object from the lens

bull Concave lenses always form virtual upright

images that are smaller than the object

The Eye and Vision

bull The eye contains a lens that changes shape to

produce sharp images on the retina

bull Farsightedness occurs when the eye cannot

form a sharp image of nearby objects

Nearsightedness occurs when the eye cannot

form sharp images of distant objects

6 Calculate Object Distance If you looked through a

convex lens with a focal length of 15 cm and saw a

real inverted enlarged image what is the maximum

distance between the lens and the object

Nearsightedness If you have nearsighted friends you knowthat they can see only nearby objects clearly Their eyes cannotform a sharp image on the retina of an object that is far awayInstead the image is formed in front of the retina as shown inFigure 23 To correct this problem a nearsighted person canwear concave lenses Figure 23 shows how a concave lens causesincoming light rays from distant objects to diverge before theyreach the eye Then the rays can be focused by the eye to form asharp image on the retina

Figure 23 Nearsightedness can

be corrected with concave lenses

Focalpoint

Light fromdistant object

Nearsighted eye

Focalpoint

Light fromdistant object

Correctednearsighted eye

When a nearsighted person looks at distant objects a

sharp image is formed in front of the retina

A concave lens in front of a nearsighted eye makes light

rays diverge so a sharp image is formed on the retina

More Section Review gpesciencecom

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How can you see the back of your head You

can use two mirrors to view a reflection of a

reflection of the back of your head

Real-World ProblemHow many images are seen in two mirrors

Goal Infer how the number of images depends

on the angle between two mirrors

Materialsplane mirrors (2) protractor

masking tape paper clip

Safety Precautions

Handle glass mirrors and paper clips carefully

Procedure1 Complete the safety form

2 Lay one mirror on top of the other with the

mirror surfaces together Tape together one

side so they can open and close Use tape to

label them L and R for left and right

3 Open the mirrors and stand them on a sheet

of paper at an angle of 72deg

4 Bend one leg of a paper clip up 90deg and

place it close to the front of the R mirror

5 Count the number of images of the paper

clip you see in the R and L mirrors Record

these numbers in your data table

6 The mirrors create an image of a circle

divided into wedges Record the number

of wedges

7 Hold the R mirror still and slowly move the Lmirror to 90deg Record the numbers of images

of the clip and wedges in the circle Repeat

this time opening the mirrors to 120deg

Conclude and Apply1 Infer the relationship between the number

of wedges and paper clip images

2 Determine the angle that would divide a

circle into six wedges Hypothesize how

many images would be produced Test your

hypothesis

Reflections of Reflections

Demonstrate for younger students the

relationship between the angle of the

mirrors and the number of reflections

338 CHAPTER 11 Sound and Light

Angle

Number of Number

of Mirrors Paper Clip Images

of Wedges R L

72ordm

90ordm

120ordm

Images and Wedges Seen in the Mirrors

Do not write in this book

SECTION 4 Light and Color 339

Why Objects Have ColorWhy do some apples appear red while others look green or

yellow An objectrsquos color depends on the wavelengths of light itreflects Recall that white light is a blend of all colors of visiblelight When a red apple is struck by white light it reflects redlight back to your eyes and absorbs all of the other colorsFigure 24 shows white light striking a green leaf Only the wave-lengths corresponding to green light are reflected to your eyes

Although some objects appear to be black black isnrsquot acolor Black is the absence of visible light Objects that appearblack absorb all colors of light and reflect little or no light backto your eyes White objects appear to be white because theyreflect all colors of visible light

Why does a white object appear white

Colored Filters Wearing tinted glasses changesthe color of almost everything you see If the lensesare yellow the world takes on a golden glow If theyare rose colored everything looks rosy Somethingsimilar would occur if you placed a colored clearplastic sheet over this white page The paper wouldappear to be the same color as the plastic The plasticsheet and the tinted lenses are filters A filter is atransparent material that transmits one or more col-ors of light but absorbs all others The color of a fil-ter is the color of the light that it transmits

Light and Color

Reading Guide

Explain how you see color Describe the difference between

light color and pigment color Predict what happens when dif-

ferent colors are mixed

From traffic lights to great works of

art color is an important part of your

world

Review Vocabulary

retina inner layer of the eye con-

taining cells that convert light

images into electrical signals

New Vocabulary

bull pigment

Figure 24 This leaf absorbs all

wavelengths of visible light except

the wavelengths you see as green

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340 CHAPTER 11 Sound and Light

Looking Through Colored Filters Figure 25 shows howthe color of an object can change when you look at it throughvarious colored filters The cooler looks blue under white lightbecause it reflects only the wavelengths of blue light that strikeit If you look at the cooler through a blue filter the cooler stilllooks blue because the blue filter transmits the reflected bluelight However if you look at the cooler through a red filter thecooler seems black because the red filter blocks the blue lightreflected by the cooler

Why does a blue object appear black whenviewed through a red filter

Seeing ColorAs you approach a busy intersection the color of the traffic

light changes from green to yellow to red On the cross street thecolor changes from red to green At a busy intersection trafficsafety depends on your ability to detect color changes rapidlyHow do you see colors

Light and the Eye In a healthy eye light enters the eyethrough the cornea is focused by the lens and finally forms animage on the retina The retina is made up of two types of cellsthat absorb light as shown in Figure 26 When these cellsabsorb light energy chemical reactions convert light energy intonerve impulses that are transmitted to the brain One type ofcell in the retina called a cone enables you to distinguish colorsand detailed shapes of objects Cones need bright light to gener-ate nerve impulses so they do not operate in dim light As aresult even brightly colored objects might look gray or black indim light

Figure 25 The color of this

cooler changes when viewed

through different color filters

Topic Color BlindnessVisit for Web

links to information about the

causes of color blindness

Activity Research the causes

and types of color blindness Find

out how cones are related to the

ability to distinguish colors

gpesciencecom

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SECTION 4 Light and Color 341

Cones and Rods Your eyes have three types of cones each ofwhich responds to a different range of wavelengths Red conesrespond to mostly red and yellow light Green cones respond tomostly yellow and green light Blue cones respond to mostlyblue and violet light The second type of cell in the retina calleda rod is sensitive to dim light and enables you to see at nightHowever rod cells do not enable you to see colors

Interpreting Color Why does a bananalook yellow The light reflected by the

banana causes the cone cells that are sensitive to red and greenlight to send signals to your brain Your brain could get the samesignal if a mixture of red light and green light reached your eyesThis mixture also would cause your red and green cones torespond and you would see the color yellow As a result lightwith wavelengths corresponding to yellow light and light that isa mixture of red and green light both cause the color yellow tobe seen What happens when you look at a white shirt You seewhite when all wavelengths of visible light enters your eyes Thenall three sets of cones cells send signals to the brain The com-bination of these signals cause you to see the shirt as white

Color Blindness If one or more of your sets of cone cellsdo not function properly you might not be able to distinguishcertain colors This condition is called color blindness orcolor deficiency About eight percent of men and one-halfpercent of women have some form of color blindness Themost common form of color blindness makes it difficult todistinguish between red and green Figure 27 shows an imagethat is used in a test for redndashgreen color blindness Becausered and green are used in traffic signals drivers and pedestri-ans must be able to identify them

Retina

Rod

Cone

Lens

Figure 27 Color blindness is an

inherited sex-linked condition in

which certain sets of cones in the

retina do not function properly

Identify the number that you seein the dots

Figure 26 Light enters the eye

and focuses on the retina The two

types of light-detecting cells

that make up the retina

are called rods and cones

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342 CHAPTER 11 Sound and Light

Mixing ColorsIf you have ever browsed through a paint store you have

probably seen displays where customers can select paint samplesof almost every imaginable color The colors are a result of mix-tures of pigments For example you might have mixed blue andyellow paint to produce green paint A pigment is a coloredmaterial that is used to change the color of other substancesThe color of a pigment results from the different wavelengths oflight that the pigment reflects

Mixing Colored Lights From the glowing orange of a sun-set to the deep blue of a mountain lake all the colors you see canbe made by mixing three colors of light These three colorsmdashred green and bluemdashare the primary colors of light They cor-respond to the three different types of cones in the retina ofyour eye When mixed together in equal amounts they producewhite light as Figure 28 shows Mixing the primary colors indifferent proportions can produce the colors you see

What are the primary colors of light

Paint Pigments If you were to mix equal amounts of redgreen and blue paint would you get white paint If mixing col-ors of paint were like mixing colors of light you would but mix-ing paint is different Paints are made with pigments Pigmentsproduce color as a result of the wavelengths of light they reflectPaint pigments usually are made of chemical compounds suchas titanium oxide a bright white pigment and lead chromatewhich is used for painting yellow lines on highways

Figure 28 White light is pro-

duced when the three primary col-

ors of light are mixed in equal

amounts

Color for PhotosynthesisPlant pigments determinethe wavelengths oflight for photosynthesisLeaves usually look greenbecause of the pigmentchlorophyll Chlorophyllabsorbs most wave-lengths of visible lightexcept green which itreflects However not allplants are green Researchdifferent plant pigmentsto find out how they allowplant species to survive indiverse habitats

GPS+_342

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SECTION 4 Light and Color 343

Self Check

1 Identity what colors are reflected and what colors are

absorbed if a white light shines on a red shirt

2 Discuss how the primary colors of light differ from the

primary pigment colors

3 Explain why a red apple would appear black if you

looked at it through a blue filter

4 Determine why a white fence appears to be white instead

of multicolored if all colors are present in white light

5 Think Critically Light reflected from an object passes

through a green filter then a red filter and finally a

blue filter What color will the object seem to be

Summary

Why Objects Have Color

bull The color of an object is determined by the

wavelengths of light it reflects

bull The color of a filter is the color of the light the

filter transmits

Seeing Color

bull Rod and cone cells are light-sensitive cells

found in the retina of the human eye

bull Rod cells are sensitive to dim light Cone cells

enable colors to be seen

bull There are three types of cone cells One type

responds to red light another to green light

and another to blue light

Mixing Colors

bull Red green and blue are the primary light

colors Any color of light can be created by

mixing these primary light colors

bull Any pigment color can be formed by mixing

the primary pigment colorsmdashmagenta cyan

and yellow

6 Use Percentages In the human eye there are about

120000000 rods If 90000000 rods trigger at once

what percentage of the total number of rods triggered

7 Convert Units The wavelengths of light are measured

in nanometers (nm) which equals 0000001 mm

Find the wavelength in mm of a light wave that has a

wavelength of 690 nm

Mixing Pigments You can make any pigment color by mixingdifferent amounts of the three primary pigmentsmdashmagenta(bluish red) cyan (greenish blue) and yellow In fact color print-ers use these pigments as well as black ink to make full-colorprints like the pages in this book A primary pigmentrsquos colordepends on the wavelengths of the light that it reflects Actuallypigments both absorb and reflect a range of colors in sending asingle color message to your eye For example in white lightyellow pigment appears yellow because it reflects red and greenlight but absorbs the other wavelengths of visible light The colorof a mixture of two primary pigments is determined by theprimary colors of light that both pigments reflect

Look at Figure 29 The area in the center where the colors alloverlap appears to be black because the three blended primarypigments absorb all the primary colors of light Recall that theprimary colors of light combine to produce white light They arecalled additive colors However when the primary pigment col-ors are combined they absorb all wavelengths of visible light andproduce black Because black results from the absence ofreflected light the primary pigments are called subtractive colors

Figure 29 The three primary

pigment colors appear to be black

when they are mixed

Describe how the primary pigmentcolors are similar to the primary col-ors of light

More Section Review gpesciencecom

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Design Your OwnDesign Your Own

344

Real-World ProblemWhat loud noises do you enjoy and which ones do you find annoying

Most people enjoy a music concert performed by their favorite artist or

the booming displays of fireworks on the Fourth of July Most people

enjoy these loud sounds for short periods of time However certain

other loud noises such as traffic sirens and loud talking can be

annoying Constant annoying noises are called noise pollution What

can be done to reduce noise pollution What types of barriers will best

block out noise pollution

Form a HypothesisBased on your experiences with loud noises form a hypothesis that

predicts the effectiveness of different types of barriers at blocking out

noise pollution

Test Your HypothesisMake a Plan

1 Complete the safety form

2 Decide what type of barriers or materials you will test

3 Describe exactly how you will use these materials

Goals Design an experiment

that tests the effective-

ness of various types of

barriers and materials

for blocking out noise

pollution

Test different types of

materials and barriers

to determine the best

noise blocks

Possible Materialsradio CD player horn

drum or other loud

noise source

shrubs trees concrete

walls brick walls stone

walls wooden fences

parked cars or hanging

laundry

sound meter

meterstick or metric tape

measure

Blocking NfisePollution

4 Identify the controls and variables you will use in your

experiment

5 List the steps you will use and describe each step precisely

6 Prepare a data table in your Science Journal to record your

measurements

7 Organize the steps of your experiment in logical order

Follow Your Plan

1 Ask your teacher to approve your plan and data table before

you start

2 Conduct your experiment as planned

3 Test each barrier two or three times

4 Record the results from each test in your data table in your Science Journal

Analyze Your Data1 Identify the barriers that most effectively reduced noise pollution

2 Identify the barriers that least effectively reduced noise pollution

3 Compare the effective barriers and identify common characteristics that might

explain why they reduced noise pollution

4 Compare the natural barriers you tested with the artificial barriers Which type

of barrier best reduced noise pollution

5 Compare the different types of materials the barriers were made of Which

type of material best reduced noise pollution

Conclude and Apply1 Evaluate whether your results support your hypothesis

2 Predict how your results would differ if you used a louder source of noise such

as a siren

3 Infer from your results how people living near a

busy street could reduce noise pollution

4 Identify major sources of noise pollution in or

near your home How could they be reduced

5 Research how noise pollution can be

unhealthy

LAB 345

Draw a poster illustrating how builders and

landscapers could use certain materials to

better insulate a home or office from excess

noise pollution

346 CHAPTER 11 Sound and Light

A Haiku GardenThe Four Seasons in Poems and Prints

by Stephen Addiss with Fumiko and Akira Yamamoto

Respond to the Reading1 How do the illustrations help the reader

better understand the poems2 What do you think is meant by the

word lingering in the Haiku about springsunlight

3 Linking Science and Writing Writeone haiku about summer and anotherabout fall In one poem use color tohelp you describe the season In theother use light or some property oflight to help describe the season

Research has deter-mined that there is a

connection between color and mood Warmcolors have longer wavelengths and can bemore stimulating Cool colors which haveshorter wavelengths tend to have a calmingor soothing effect on people Light and colorhave long been used as literary symbols Doesthe use of color change what you imaginewhen you read the haiku

UnderstandingLiteratureJapanese Haiku A haiku is a verse thatconsists of three lines and 17 syllables inthe Japanese language The first and thirdlines have five syllables each and themiddle line has seven syllables Why isimagination important in reading haiku

Lingering

in every pool of watermdash

spring sunlightIssa

Withered by winter

the sound of the windmdash

one-color worldBasho

Sound

1 Sound waves are compressional waves thattravel only in matter

2 The speed of sound in a material dependson the type of material as well as itstemperature

3 Loudness depends on a sound waversquos inten-sity Pitch depends on a sound waversquosfrequency

4 Sound waves are used in echolocationsonar and medical imaging

Reflection and Refractionof Light

1 Light can be absorbed reflected or trans-mitted by a material

2 When light waves are reflected theyobey the law of reflectionmdashthe angle ofincidence equals the angle of reflection

3 A light wave is refracted or bent whenit changes speed as it travels at an anglefrom one material to another

Mirrors Lenses andthe Eye

1 Plane mirrors form upright virtual images

2 Images formed by concave mirrors andconvex lenses depend on the location ofthe object relative to the focal point

3 Convex mirrors and concave lenses formvirtual upright images that are smallerthan the object

4 The lens in the human eye changes shape toproduce a sharp image on the retina

Light and Color

1 You see color when light is reflected offobjects and into your eyes

2 Cone cells in the retina are light-sensitivecells that enable you to distinguish colors

3 Red blue and green are the three primarycolors of light and can be mixed to form allother colors

4 The primary pigment colors are magentacyan and yellow

CHAPTER STUDY GUIDE 347

Use the Foldable you made at the beginningof the chapter to help you review sound and light

Interactive Tutor gpesciencecom

Complete each statement with the correctvocabulary word or phrase

1 A change in frequency due to a movingsound source is due to the

2 A flat smooth surface that reflects light andforms an image is a(n)

3 An object is if you can seethrough it clearly

4 The of a material indicates howmuch the speed of light in the materialchanges as light passes through

5 You can change the color of white paint byadding a(n) to it

6 A(n) is a reflecting surface thatcurves outward like the back of a spoon

7 The human perception of the intensity of asound wave is

Choose the word or phrase that best answerseach question

8 Which of the following best describes imageformation by a plane mirrorA) A real image is formed in front of the mirrorB) A real image is formed behind the mirrorC) A virtual image is formed in front of the

mirrorD) A virtual image is formed behind the mirror

9 For a sound with low pitch what else isalso always lowA) amplitude C) wavelengthB) frequency D) wave velocity

10 Which of the following occurs when asound source moves away from youA) The soundrsquos velocity decreasesB) The soundrsquos loudness increasesC) The soundrsquos frequency decreasesD) The soundrsquos frequency increases

Use the table below to answer question 11

11 Based on the data in the table abovewhich of the following would be the speedof sound in air at 30degCA) 3404 ms C) 3494 msB) 3464 ms D) 3534 ms

12 What happens to a light ray travelingparallel to the optical axis of a convexlens that passes through the lensA) It travels parallel to the optical axisB) It passes through the focal pointC) It is bent away from the optical axisD) It forms a virtual image

13 Light waves of which color are bent mostwhen passing through a prismA) blue C) violetB) red D) yellow

14 Which way does a concave lens bend lightA) toward its optical axisB) toward its centerC) toward its edgesD) toward its focal point

Speed of Sound in Air

Temp peed( s)

4

4

4

348 CHAPTER REVIEW

concave lens p 335concave mirror p 332convex lens p 333convex mirror p 333decibel p 322Doppler effect p 323index of refraction p 329intensity p 322

loudness p 322opaque p 327pigment p 342pitch p 323plane mirror p 331translucent p 327transparent p 327

Vocabulary PuzzleMaker gpesciencecom

Use the illustration below to answer question 15

15 Describe how the position of the candlechanged if the image of the candle movedaway from the focal point

16 Apply Acoustic scientists sometimes doresearch in rooms that absorb all soundwaves How could such a room be used tostudy how bats find their food

17 Compare White light passes through atranslucent pane of glass and shines on ashirt Both the translucent glass and theshirt appear green Compare the colors oflight that are absorbed and transmitted bythe glass and the shirt

18 Infer Most mammals including dogs andcats canrsquot see colors Infer how the retinaof a catrsquos eye might be different from theretina of a human eye

19 Determine whether a convex lens could forman image that is enlarged real and upright

20 Infer A car comes to a railroad crossingThe driver hears a trainrsquos whistle and itspitch becomes lower What can beassumed about how the train is moving

21 Compare and contrast the reflection of lightfrom a white wall with a rough surfacewith the reflection of light from a mirror

Optical axis

One

focal

length

Two

focal

lengths

Image

Ray A

Object

Focal

point

Interpreting Graphics 22 Infer why a convex mirror and a concavelens can never produce a real image

23 Predict what color a white shirt wouldappear to be if the light reflected from theshirt passed through a red filter and thenthrough a green filter

24 Explain why windows might begin to rattlewhen an airplane flies overhead

25 Communicate Some people enjoy usingsnowmobiles Others object to the noisethat they make Write a proposal for a pol-icy that seems fair to both groups for theuse of snowmobiles in a state park

CHAPTER REVIEW 349

Use the wave speed equation ν ƒλ to answer

questions 26 and 27

26 Calculate Frequency A sonar pulse has awavelength of 30 cm and a speed inwater of 1500 ms Find its frequency

27 Calculate Wavelength What is the wave-length of a sound wave with a fre-quency of 440 Hz if the speed of soundin air is 340 ms

28 Calculate Angle of Incidence A light ray isreflected from a mirror If the anglebetween the incident ray and thereflected ray is 136deg what is the angleof incidence

29 Determine Object Distance You hold anobject in front of a concave mirror witha focal length of 30 cm If you do notsee a reflected image how far from themirror is the object

30 Calculate Speed The speed of light in avacuum is 300000 kms If the index ofrefraction of water is 133 what is thespeed of light in water

More Chapter Review gpesciencecom

1 Which of the following describes the imageformed by a convex mirror

A enlarged

B inverted

C real

D virtual

Use the figure below to answer question 2

2 Which of the following describes a light raythat passes through the focal point andthen is reflected by the mirror

A It travels parallel to the optical axis

B It forms a real image

C It is reflected back through the focal point

D It forms a virtual image

3 Why does an apple look red

A It reflects red light

B It absorbs red light

C It reflects green and blue light

D It reflects all colors of light except red

Use the figure below to answer questions 4 and 5

4 When the primary colors of light are addedtogether what color appears in area H

A cyan

B magenta

C white

D yellow

5 When the primary colors of light are addedtogether what color appears in area G

A cyan

B magenta

C white

D yellow

6 Which of the following increases as the fre-quency of a sound increases

A amplitude

B intensity

C loudness

D pitch

Red Blue

Green

F

H

G K

Focal pointOptical axis

350 STANDARDIZED TEST PRACTICE

Record your answers on the answer sheet provided by your teacher or on a sheet of paper

STANDARDIZED TEST PRACTICE 351

7 Which of the following parts of the eyeenable you to see colors in bright light

A cone cells

B cornea

C lens

D rod cells

Use the graph below to answer questions 8 and 9

8 Determine how far in centimeters theimage is from the lens when the object is15 centimeters from the lens

9 How far in centimeters is the object fromthe lens when the image distance andobject distance are equal

10 A shirt has stripes that are black and whitein white light If green light shines on thisshirt what colors will the black and whitestripes be

11 If you are on a moving train what hap-pens to the pitch of a crossing bell as youapproach the crossing and then moveaway from the crossing

Use the figure below to answer question 12

12 Describe the vision problem show by thefigure and explain how this vision prob-lem can be corrected

13 Explain why the human eye can see colorsbetter in bright light than in dim light

Image Distance fora Convex Lens

Ima

ge

dis

tan

ce (

cm)

30

25

20

15

10

5 10 15 20 25 30

Object distance (cm)

Standardized Test Practice gpesciencecom

Note Units Read carefully and make note of the units used in

any measurement

  • Glencoe Physical Science with Earth Science
    • Student Edition Table of Contents
      • Unit 1 Science and Technology
        • Chapter 1 The Nature of Science
          • Launch Lab Understanding Measurements
          • Foldables
          • Section 1 The Methods of Science
            • Science Online
            • Integrate History
            • Integrate Earth Science
            • Science Online
              • Section 2 Standards of Measurement
                • Applying Math Centimeters
                • Integrate Earth Science
                • Science Online
                • MiniLAB Determining the Density of a Pencil
                • Visualizing SI Dimensions
                  • Section 3 Communicating with Graphs
                    • Applying Math Temperature
                    • MiniLAB Graphing Temperature Change
                    • Lab Whats my graph
                    • Lab Design Your Own - Developing a Measurement System
                    • Science and Language Arts Thinking in Pictures and Other Reports from My Life with Autism
                      • Chapter 1 Study Guide
                      • Chapter 1 Review
                      • Chapter 1 Standardized Test Practice
                        • Chapter 2 Science Technology and Society
                          • Lab Technology in Your Life
                          • Foldables
                          • Section 1 Science and Technology
                            • MiniLAB Researching the Past
                            • Visualizing Technology Supplying Basic Needs
                            • Science Online
                              • Section 2 Forces that Shape Technology
                                • MiniLAB Evaluating the Benefits and Consequences of Technology
                                • Integrate Environment
                                • Integrate History
                                • Applying Science What impact does the accident at Chernobyl have on the future of nuclear power
                                • Science Online
                                • Lab Who contributes CO2
                                  • Section 3 Developing Technology
                                    • Integrate Life Science
                                    • Integrate Career
                                    • Lab Model and Invent - Care Package
                                    • Oops Accidents in Science A Slippery Situation
                                      • Chapter 2 Study Guide
                                      • Chapter 2 Review
                                      • Chapter 2 Standardized Test Practice
                                          • Unit 2 Motion Forces and Energy
                                            • Chapter 3 Motion Acceleration and Forces
                                              • Launch Lab Compare Speeds
                                              • Foldables
                                              • Section 1 Describing Motion
                                                • MiniLAB Measuring Average Speed
                                                • Science Online
                                                • Applying Math Average Speed
                                                • Integrate Astronomy
                                                • Science Online
                                                  • Section 2 Acceleration
                                                    • Integrate History
                                                    • Visualizing Acceleration
                                                      • Section 3 Motion and Forces
                                                        • Science Online
                                                        • MiniLAB Comparing Friction
                                                        • Lab Force and Acceleration
                                                        • Lab Design Your Own - Comparing Motion from Different Forces
                                                        • Science and Language Arts A Brave and Startling Truth
                                                          • Chapter 3 Study Guide
                                                          • Chapter 3 Review
                                                          • Chapter 3 Standardized Test Practice
                                                            • Chapter 4 The Laws of Motion
                                                              • Launch Lab The Force of Gravity
                                                              • Foldables
                                                              • Section 1 The First Two Laws of Motion
                                                                • MiniLAB Observing Inertia
                                                                • Science Online
                                                                • Applying Math The Acceleration of a Sled Solve a Simple Equation
                                                                  • Section 2 Gravity
                                                                    • Science Online
                                                                    • Integrate Earth Science
                                                                    • MiniLAB Observing Centripetal Force
                                                                    • Lab Gravity and Air Resistance
                                                                      • Section 3 The Third Law of Motion
                                                                        • Integrate Career
                                                                        • Visualizing Rocket Motion
                                                                        • Applying Math The Momentum of a Sprinter
                                                                        • Lab The Momentum of Colliding Objects
                                                                        • Science and History Newton and the Plague
                                                                          • Chapter 4 Study Guide
                                                                          • Chapter 4 Review
                                                                          • Chapter 4 Standardized Test Practice
                                                                            • Chapter 5 Energy
                                                                              • Launch Lab Energy Conversions
                                                                              • Foldables
                                                                              • Section 1 The Nature of Energy
                                                                                • Science Online
                                                                                • Applying Math Kinetic Energy
                                                                                • MiniLAB Interpreting Data from a Slingshot
                                                                                • Integrate Language Arts
                                                                                • Applying Math Gravitational Potential Energy
                                                                                • Lab Bouncing Balls
                                                                                  • Section 2 Conservation of Energy
                                                                                    • Visualizing Energy Transformations
                                                                                    • Integrate Environment
                                                                                    • MiniLAB Transforming Energy in a Paper Clip
                                                                                    • Science Online
                                                                                    • Integrate Health
                                                                                    • Lab Design Your Own - Swinging Energy
                                                                                    • Science and History The Impossible Dream
                                                                                      • Chapter 5 Study Guide
                                                                                      • Chapter 5 Review
                                                                                      • Chapter 5 Standardized Test Practice
                                                                                        • Chapter 6 Work and Machines
                                                                                          • Launch Lab Doing Work with a Simple Machine
                                                                                          • Foldables
                                                                                          • Section 1 Work
                                                                                            • Integrate Language Arts
                                                                                            • Applying Math Work
                                                                                            • MiniLAB Calculating Your Work and Power
                                                                                            • Applying Math Power
                                                                                              • Section 2 Using Machines
                                                                                                • MiniLAB Machines Multiplying Force
                                                                                                • Science Online
                                                                                                • Integrate Chemistry
                                                                                                  • Section 3 Simple Machines
                                                                                                    • Integrate History
                                                                                                    • Visualizing Levers in the Human Body
                                                                                                    • Science Online
                                                                                                    • Lab Levers
                                                                                                    • Lab Model and Invent - Using Simple Machines
                                                                                                    • Science and Society The Science of Very Very Small
                                                                                                      • Chapter 6 Study Guide
                                                                                                      • Chapter 6 Review
                                                                                                      • Chapter 6 Standardized Test Practice
                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                          • Launch Lab Relative Sizes of Earth the Moon and the Sun
                                                                                                          • Foldables
                                                                                                          • Section 1 Earth in Space
                                                                                                            • Science Online
                                                                                                            • Integrate Physics
                                                                                                              • Section 2 Time and Seasons
                                                                                                                • MiniLAB Modeling the Suns Rays at Solstice
                                                                                                                • Lab Comparing the Angle of Sunlight to Intensity
                                                                                                                  • Section 3 Earths Moon
                                                                                                                    • Applying Math Tides
                                                                                                                    • MiniLAB Modeling Phases and Eclipses
                                                                                                                    • Integrate History
                                                                                                                    • Integrate History
                                                                                                                    • Science Online
                                                                                                                    • Visualizing Water on the Moon
                                                                                                                    • Lab Identifying the Moons Surface Features and Apollo Landing Sites
                                                                                                                    • Oops Accidents in Science Even Great Scientists Make Mistakes
                                                                                                                      • Chapter 7 Study Guide
                                                                                                                      • Chapter 7 Review
                                                                                                                      • Chapter 7 Standardized Test Practice
                                                                                                                        • Chapter 8 The Solar System
                                                                                                                          • Launch Lab The Size of the Solar System
                                                                                                                          • Foldables
                                                                                                                          • Section 1 Planet Motion
                                                                                                                            • Integrate History
                                                                                                                            • MiniLAB Plotting Retrograde Motion
                                                                                                                            • Integrate Physics
                                                                                                                            • Applying Math Heliocentric Longitude (HL)
                                                                                                                              • Section 2 The Inner Planets
                                                                                                                                • Science Online
                                                                                                                                • Integrate Chemistry
                                                                                                                                • Lab Interpreting Features of Marss Surface
                                                                                                                                  • Section 3 The Outer Planets
                                                                                                                                    • Integrate Language Arts
                                                                                                                                    • Visualizing What Galileo Saw
                                                                                                                                    • Science Online
                                                                                                                                    • MiniLAB Comparing Sizes of Outer and Inner Planets
                                                                                                                                      • Section 4 Life in the Solar System
                                                                                                                                        • Lab Design Your Own - Testing Unknown Soil Samples for Life
                                                                                                                                        • Science Stats Night Sky Wonders
                                                                                                                                          • Chapter 8 Study Guide
                                                                                                                                          • Chapter 8 Review
                                                                                                                                          • Chapter 8 Standardized Test Practice
                                                                                                                                              • Unit 3 Energy in Motion
                                                                                                                                                • Chapter 9 Heat and States of Matter
                                                                                                                                                  • Launch Lab Expansion of a Gas
                                                                                                                                                  • Foldables
                                                                                                                                                  • Section 1 Temperature and Thermal Energy
                                                                                                                                                    • Applying Math Converting to Celsius
                                                                                                                                                    • Science Online
                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                    • Applying Math Change in Thermal Energy
                                                                                                                                                      • Section 2 States of Matter
                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                        • Science Online
                                                                                                                                                        • MiniLAB Comparing States of Water
                                                                                                                                                          • Section 3 Transferring Thermal Energy
                                                                                                                                                            • MiniLAB Comparing Thermal Conductors
                                                                                                                                                            • Visualizing Convection Currents
                                                                                                                                                            • Lab Convection in Gases and Liquids
                                                                                                                                                              • Section 4 Using Thermal Energy
                                                                                                                                                                • Integrate History
                                                                                                                                                                • Science Online
                                                                                                                                                                • Lab Conduction in Gases
                                                                                                                                                                • Science Stats Surprising Thermal Energy
                                                                                                                                                                  • Chapter 9 Study Guide
                                                                                                                                                                  • Chapter 9 Review
                                                                                                                                                                  • Chapter 9 Standardized Test Practice
                                                                                                                                                                    • Chapter 10 Waves
                                                                                                                                                                      • Launch Lab How do waves transfer energy
                                                                                                                                                                      • Foldables
                                                                                                                                                                      • Section 1 The Nature of Waves
                                                                                                                                                                        • Visualizing Formation of Ocean Waves
                                                                                                                                                                        • Science Online
                                                                                                                                                                          • Section 2 Wave Properties
                                                                                                                                                                            • MiniLAB Observing Wavelength
                                                                                                                                                                            • Integrate Social Studies
                                                                                                                                                                            • Applying Math The Speed of Sound
                                                                                                                                                                            • Lab Wave Speed and Tension
                                                                                                                                                                              • Section 3 The Behavior of Waves
                                                                                                                                                                                • Science Online
                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                • MiniLAB Experimenting with Resonance
                                                                                                                                                                                • Lab Measuring Wave Properties
                                                                                                                                                                                • Science and History Making Waves
                                                                                                                                                                                  • Chapter 10 Study Guide
                                                                                                                                                                                  • Chapter 10 Review
                                                                                                                                                                                  • Chapter 10 Standardized Test Practice
                                                                                                                                                                                    • Chapter 11 Sound and Light
                                                                                                                                                                                      • Launch Lab What sound does a ruler make
                                                                                                                                                                                      • Foldables
                                                                                                                                                                                      • Section 1 Sound
                                                                                                                                                                                        • MiniLAB Comparing Intensity
                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                        • Science Online
                                                                                                                                                                                        • Applying Math Using Sonar
                                                                                                                                                                                          • Section 2 Reflection and Refraction of Light
                                                                                                                                                                                          • Section 3 Mirrors Lenses and the Eye
                                                                                                                                                                                            • Visualizing Images Formed by a Convex Lens
                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                            • MiniLAB Experimenting with Focal Lengths
                                                                                                                                                                                            • Lab Reflections of Reflections
                                                                                                                                                                                              • Section 4 Light and Color
                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Lab Design Your Own - Blocking Noise Pollution
                                                                                                                                                                                                • Science and Language Arts A Haiku Garden The Four Seasons in Poems and Print
                                                                                                                                                                                                  • Chapter 11 Study Guide
                                                                                                                                                                                                  • Chapter 11 Review
                                                                                                                                                                                                  • Chapter 11 Standardized Test Practice
                                                                                                                                                                                                    • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                      • Launch Lab Global Jigsaw Puzzle
                                                                                                                                                                                                      • Foldables
                                                                                                                                                                                                      • Section 1 Evolution of Earths Crust
                                                                                                                                                                                                        • Applying Math Spreading Distances
                                                                                                                                                                                                        • Integrate Physics
                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                          • Section 2 Earthquakes
                                                                                                                                                                                                            • MiniLAB Demonstrating Four Types of Stress
                                                                                                                                                                                                            • Visualizing Earthquake-Proof Buildings
                                                                                                                                                                                                              • Section 3 Earths Interior
                                                                                                                                                                                                              • Section 4 Volcanoes
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • MiniLAB Modeling Lava Viscosity
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                • Lab A Case for Pacific Plate Motion
                                                                                                                                                                                                                • Lab Earthquake Earthquake Wheres the earthquake
                                                                                                                                                                                                                • Science and History Volcano Weather
                                                                                                                                                                                                                  • Chapter 12 Study Guide
                                                                                                                                                                                                                  • Chapter 12 Review
                                                                                                                                                                                                                  • Chapter 12 Standardized Test Practice
                                                                                                                                                                                                                      • Unit 4 Forms of Energy
                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                          • Launch Lab Electric Circuits
                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                          • Section 1 Electric Charge
                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                            • Visualizing Lightning
                                                                                                                                                                                                                            • MiniLAB Investigate Charged Objects
                                                                                                                                                                                                                              • Section 2 Electric Current
                                                                                                                                                                                                                                • MiniLAB Investigating Battery Addition
                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                • Lab Identifying Conductors and Insulators
                                                                                                                                                                                                                                  • Section 3 Electrical Energy
                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                    • Applying Math Power Used by a Clothes Dryer
                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                    • Applying Math Electrical Energy Used by a Microwave Oven
                                                                                                                                                                                                                                    • Lab Design Your Own - Comparing Series and Parallel Circuits
                                                                                                                                                                                                                                    • Science and Language Arts Invisible Man
                                                                                                                                                                                                                                      • Chapter 13 Study Guide
                                                                                                                                                                                                                                      • Chapter 13 Review
                                                                                                                                                                                                                                      • Chapter 13 Standardized Test Practice
                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                          • Launch Lab The Strength of Magnets
                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                          • Section 1 Magnetism
                                                                                                                                                                                                                                            • MiniLAB Observing Magnetic Interference
                                                                                                                                                                                                                                            • Integrate Earth Science
                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                            • Applying Science How can magnetic parts of a junk car be salvaged
                                                                                                                                                                                                                                            • MiniLAB Making Your Own Compass
                                                                                                                                                                                                                                              • Section 2 Electricity and Magnetism
                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                  • Section 3 Producing Electric Current
                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                    • Visualizing Motors and Generators
                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                    • Lab Electricity and Magnetism
                                                                                                                                                                                                                                                    • Lab Design Your Own - Controlling Electromagnets
                                                                                                                                                                                                                                                    • Science and History Body Art
                                                                                                                                                                                                                                                      • Chapter 14 Study Guide
                                                                                                                                                                                                                                                      • Chapter 14 Review
                                                                                                                                                                                                                                                      • Chapter 14 Standardized Test Practice
                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                          • Launch Lab Can electromagnetic waves change materials
                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                          • Section 1 What are electromagnetic waves
                                                                                                                                                                                                                                                            • MiniLAB Investigating Electromagnetic Waves
                                                                                                                                                                                                                                                            • Applying Math The Speed of Light in Water
                                                                                                                                                                                                                                                              • Section 2 The Electromagnetic Spectrum
                                                                                                                                                                                                                                                                • MiniLAB Heating with Microwaves
                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                • Lab The Shape of Satellite Dishes
                                                                                                                                                                                                                                                                  • Section 3 Radio Communication
                                                                                                                                                                                                                                                                    • Visualizing Radio Broadcasts
                                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Lab Use the Internet - Radio Frequencies
                                                                                                                                                                                                                                                                    • Science and History Riding a Beam of Light
                                                                                                                                                                                                                                                                      • Chapter 15 Study Guide
                                                                                                                                                                                                                                                                      • Chapter 15 Review
                                                                                                                                                                                                                                                                      • Chapter 15 Standardized Test Practice
                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                          • Launch Lab Heating with Solar Energy
                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                          • Section 1 Fossil Fuels
                                                                                                                                                                                                                                                                            • Visualizing The Formation of Fossil Fuels
                                                                                                                                                                                                                                                                            • MiniLAB Designing an Efficient Water Heater
                                                                                                                                                                                                                                                                              • Section 2 Nuclear Energy
                                                                                                                                                                                                                                                                                • Integrate Earth Science
                                                                                                                                                                                                                                                                                • Integrate Social Science
                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                • Applying Science Can a contaminated radioactive site be reclaimed
                                                                                                                                                                                                                                                                                  • Section 3 Renewable Energy Sources
                                                                                                                                                                                                                                                                                    • MiniLAB Using Solar Power at Home
                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                    • Lab Solar Heating
                                                                                                                                                                                                                                                                                    • Lab Use the Internet How much does energy really cost
                                                                                                                                                                                                                                                                                    • Science and Society Reacting to Nuclear Energy
                                                                                                                                                                                                                                                                                      • Chapter 16 Study Guide
                                                                                                                                                                                                                                                                                      • Chapter 16 Review
                                                                                                                                                                                                                                                                                      • Chapter 16 Standardized Test Practice
                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                          • Lab Atmospheric Pressure
                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                          • Section 1 Earths Atmosphere
                                                                                                                                                                                                                                                                                            • MiniLAB Visualizing Convection
                                                                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                                                                            • Lab Visualizing a Temperature Inversion
                                                                                                                                                                                                                                                                                              • Section 2 Weather
                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Coriolis Effect
                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                  • Section 3 Climate
                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                    • Visualizing Earths Biogeophysical System
                                                                                                                                                                                                                                                                                                      • Section 4 Earths Changing Climates
                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                        • Applying Math Carbon Dioxide (CO2) Concentration
                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Investigating Microclimate
                                                                                                                                                                                                                                                                                                        • Science and Language Arts The Grapes of Wrath
                                                                                                                                                                                                                                                                                                          • Chapter 17 Study Guide
                                                                                                                                                                                                                                                                                                          • Chapter 17 Review
                                                                                                                                                                                                                                                                                                          • Chapter 17 Standardized Test Practice
                                                                                                                                                                                                                                                                                                              • Unit 5 Matter and Earth Materials
                                                                                                                                                                                                                                                                                                                • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                  • Launch Lab Demonstrate the Distillation of Water
                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                  • Section 1 Composition of Matter
                                                                                                                                                                                                                                                                                                                    • Visualizing Elements
                                                                                                                                                                                                                                                                                                                    • MiniLAB Classifying Materials
                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                    • Lab Comparing Pure Substances and Mixtures
                                                                                                                                                                                                                                                                                                                      • Section 2 Properties of Matter
                                                                                                                                                                                                                                                                                                                        • Integrate Environment
                                                                                                                                                                                                                                                                                                                        • MiniLAB Separating Ink
                                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                                        • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                        • Applying Math The Law of Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Measuring the Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Science Stats Intriguing Elements
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Study Guide
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Review
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                            • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                              • Launch Lab Inferring What You Cant Observe
                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                              • Section 1 Structure of the Atom
                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling an Aluminum Atom
                                                                                                                                                                                                                                                                                                                                • Visualizing The Atomic Model
                                                                                                                                                                                                                                                                                                                                  • Section 2 Masses of Atoms
                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                    • Applying Science How can radioactive isotopes help tell time
                                                                                                                                                                                                                                                                                                                                      • Section 3 The Periodic Table
                                                                                                                                                                                                                                                                                                                                        • MiniLAB Organizing a Personal Periodic Table
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Career
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                                                                                                                                                                        • Lab A Periodic Table of Foods
                                                                                                                                                                                                                                                                                                                                        • Lab Use the Internet Whats in a name
                                                                                                                                                                                                                                                                                                                                        • Science and History A Chilling Story
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Study Guide
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Review
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                            • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                              • Launch Lab Earth Materials at Home and School
                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                              • Section 1 Minerals
                                                                                                                                                                                                                                                                                                                                                • MiniLAB Identifying Salts Crystal System
                                                                                                                                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                • Lab Be a Mineral Detective
                                                                                                                                                                                                                                                                                                                                                  • Section 2 Igneous Rocks
                                                                                                                                                                                                                                                                                                                                                    • Applying Math Extrusive Igneous Rock Classification
                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                      • Section 3 Sedimentary Rocks
                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Evaporites
                                                                                                                                                                                                                                                                                                                                                          • Section 4 Metamorphic Rocks and the Rock Cycle
                                                                                                                                                                                                                                                                                                                                                            • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                            • Visualizing Shock Metamorphic Rock
                                                                                                                                                                                                                                                                                                                                                            • Lab Identifying Rocks
                                                                                                                                                                                                                                                                                                                                                            • Science and Society Earth Materials at Work
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Study Guide
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Review
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                  • Launch Lab Have you got the time
                                                                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                                                                  • Section 1 Weathering and Soil
                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing a Disappearing Seasoning
                                                                                                                                                                                                                                                                                                                                                                    • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                    • Lab Graphing Soil Textures
                                                                                                                                                                                                                                                                                                                                                                      • Section 2 Shaping the Landscape
                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Runoff
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                          • Section 3 Groundwater
                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Porosity Volume
                                                                                                                                                                                                                                                                                                                                                                            • Visualizing The Role of Groundwater in Shaping Earths Surface
                                                                                                                                                                                                                                                                                                                                                                            • Integrate Environment
                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                              • Section 4 Geologic Time
                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                                                                                                • Lab Its about time - relative that is
                                                                                                                                                                                                                                                                                                                                                                                • Science and Society Tapping into the Underground
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Review
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                      • Unit 6 Interactions of Matter
                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                          • Lab Chemical Bonds and Mixing
                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Stability in Bonding
                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                            • Lab Atomic Trading Cards
                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Types of Bonds
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Observing a Bond Type
                                                                                                                                                                                                                                                                                                                                                                                                • Visualizing Polar Molecules
                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Writing Formulas and Naming Compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math Determining a Formula
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Science Can you name binary ionic compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Making a Hydrate
                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Model and Invent - Modeling Chemical Bonding
                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Sticky Subject
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Review
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab RustingmdashA Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Chemical Changes
                                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Designing a Team Equation
                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Chemical Equations
                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math Barium Sulfate Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Classifying Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 4 Reaction Rates and Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing Chemical Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Creating a Colorful Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab To Glow or Not to Glow
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Investigating Reaction Conditions
                                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Clumsy Move Pays Off
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Review
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab Magic Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 How Solutions Form
                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                                                                                                                                                                                                                                                            • Visualizing Metal Alloys
                                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Observing the Effect of Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Solubility and Concentration
                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Acids Bases and Salts
                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing Acid Relief
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Strength of Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Determining Acidity
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Saturated Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and Society Acid Rain
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab The Size of a Nucleus
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Strong Force
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Nuclear Decay
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Detecting Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math The Age of Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Social Studies
                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Nuclear Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling a Nuclear Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Visualizing PET Scans
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Chain Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Model and Invent Modeling Transmutations
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and History The Nuclear Alchemist
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 26 Stars and Galaxies
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab Stars in the Sky
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Observing the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling a Telescope
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math The Magnifying Power of Telescopes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Evolution of Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Counting Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing H-R Diagrams of Star Clusters
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Star Cluster Age
                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 3 Galaxies and the Milky Way
                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 4 Cosmology
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Lab Model and Invent - Expansion of the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Science and Language Arts Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Student Resources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Skill Handbook
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Scientific Methods
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Safety Symbols
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Safety in the Science Laboratory
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Math Skill Handbook
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Math Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Science Applications
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Formulas
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Extra Math Problems
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Reference Handbook
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Minerals
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Physical Science Reference Tables
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Periodic Table of the Elements
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Weather Map Symbols
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                • EnglishSpanish Glossary
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Index
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Credits
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Students Workbooks
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter Resources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 1 The Nature of Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 2 Science Technology and Society
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 3 Motion Acceleration and Forces
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 4 The Laws of Motion
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 5 Energy
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 6 Work and Machines
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 8 The Solar System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 9 Heat and States of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 10 Waves
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 11 Sound and Light
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 26 Stars and Galaxies
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Additional Resources
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Page 21: 706 S1 318-326 GPS09 - Light-and-Sound - home · PDF fileWhat sound does a ruler make? ... sound waves cannot travel in empty space where there are no particles. ... sound travels

How can you see the back of your head You

can use two mirrors to view a reflection of a

reflection of the back of your head

Real-World ProblemHow many images are seen in two mirrors

Goal Infer how the number of images depends

on the angle between two mirrors

Materialsplane mirrors (2) protractor

masking tape paper clip

Safety Precautions

Handle glass mirrors and paper clips carefully

Procedure1 Complete the safety form

2 Lay one mirror on top of the other with the

mirror surfaces together Tape together one

side so they can open and close Use tape to

label them L and R for left and right

3 Open the mirrors and stand them on a sheet

of paper at an angle of 72deg

4 Bend one leg of a paper clip up 90deg and

place it close to the front of the R mirror

5 Count the number of images of the paper

clip you see in the R and L mirrors Record

these numbers in your data table

6 The mirrors create an image of a circle

divided into wedges Record the number

of wedges

7 Hold the R mirror still and slowly move the Lmirror to 90deg Record the numbers of images

of the clip and wedges in the circle Repeat

this time opening the mirrors to 120deg

Conclude and Apply1 Infer the relationship between the number

of wedges and paper clip images

2 Determine the angle that would divide a

circle into six wedges Hypothesize how

many images would be produced Test your

hypothesis

Reflections of Reflections

Demonstrate for younger students the

relationship between the angle of the

mirrors and the number of reflections

338 CHAPTER 11 Sound and Light

Angle

Number of Number

of Mirrors Paper Clip Images

of Wedges R L

72ordm

90ordm

120ordm

Images and Wedges Seen in the Mirrors

Do not write in this book

SECTION 4 Light and Color 339

Why Objects Have ColorWhy do some apples appear red while others look green or

yellow An objectrsquos color depends on the wavelengths of light itreflects Recall that white light is a blend of all colors of visiblelight When a red apple is struck by white light it reflects redlight back to your eyes and absorbs all of the other colorsFigure 24 shows white light striking a green leaf Only the wave-lengths corresponding to green light are reflected to your eyes

Although some objects appear to be black black isnrsquot acolor Black is the absence of visible light Objects that appearblack absorb all colors of light and reflect little or no light backto your eyes White objects appear to be white because theyreflect all colors of visible light

Why does a white object appear white

Colored Filters Wearing tinted glasses changesthe color of almost everything you see If the lensesare yellow the world takes on a golden glow If theyare rose colored everything looks rosy Somethingsimilar would occur if you placed a colored clearplastic sheet over this white page The paper wouldappear to be the same color as the plastic The plasticsheet and the tinted lenses are filters A filter is atransparent material that transmits one or more col-ors of light but absorbs all others The color of a fil-ter is the color of the light that it transmits

Light and Color

Reading Guide

Explain how you see color Describe the difference between

light color and pigment color Predict what happens when dif-

ferent colors are mixed

From traffic lights to great works of

art color is an important part of your

world

Review Vocabulary

retina inner layer of the eye con-

taining cells that convert light

images into electrical signals

New Vocabulary

bull pigment

Figure 24 This leaf absorbs all

wavelengths of visible light except

the wavelengths you see as green

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340 CHAPTER 11 Sound and Light

Looking Through Colored Filters Figure 25 shows howthe color of an object can change when you look at it throughvarious colored filters The cooler looks blue under white lightbecause it reflects only the wavelengths of blue light that strikeit If you look at the cooler through a blue filter the cooler stilllooks blue because the blue filter transmits the reflected bluelight However if you look at the cooler through a red filter thecooler seems black because the red filter blocks the blue lightreflected by the cooler

Why does a blue object appear black whenviewed through a red filter

Seeing ColorAs you approach a busy intersection the color of the traffic

light changes from green to yellow to red On the cross street thecolor changes from red to green At a busy intersection trafficsafety depends on your ability to detect color changes rapidlyHow do you see colors

Light and the Eye In a healthy eye light enters the eyethrough the cornea is focused by the lens and finally forms animage on the retina The retina is made up of two types of cellsthat absorb light as shown in Figure 26 When these cellsabsorb light energy chemical reactions convert light energy intonerve impulses that are transmitted to the brain One type ofcell in the retina called a cone enables you to distinguish colorsand detailed shapes of objects Cones need bright light to gener-ate nerve impulses so they do not operate in dim light As aresult even brightly colored objects might look gray or black indim light

Figure 25 The color of this

cooler changes when viewed

through different color filters

Topic Color BlindnessVisit for Web

links to information about the

causes of color blindness

Activity Research the causes

and types of color blindness Find

out how cones are related to the

ability to distinguish colors

gpesciencecom

GPS+_340

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SECTION 4 Light and Color 341

Cones and Rods Your eyes have three types of cones each ofwhich responds to a different range of wavelengths Red conesrespond to mostly red and yellow light Green cones respond tomostly yellow and green light Blue cones respond to mostlyblue and violet light The second type of cell in the retina calleda rod is sensitive to dim light and enables you to see at nightHowever rod cells do not enable you to see colors

Interpreting Color Why does a bananalook yellow The light reflected by the

banana causes the cone cells that are sensitive to red and greenlight to send signals to your brain Your brain could get the samesignal if a mixture of red light and green light reached your eyesThis mixture also would cause your red and green cones torespond and you would see the color yellow As a result lightwith wavelengths corresponding to yellow light and light that isa mixture of red and green light both cause the color yellow tobe seen What happens when you look at a white shirt You seewhite when all wavelengths of visible light enters your eyes Thenall three sets of cones cells send signals to the brain The com-bination of these signals cause you to see the shirt as white

Color Blindness If one or more of your sets of cone cellsdo not function properly you might not be able to distinguishcertain colors This condition is called color blindness orcolor deficiency About eight percent of men and one-halfpercent of women have some form of color blindness Themost common form of color blindness makes it difficult todistinguish between red and green Figure 27 shows an imagethat is used in a test for redndashgreen color blindness Becausered and green are used in traffic signals drivers and pedestri-ans must be able to identify them

Retina

Rod

Cone

Lens

Figure 27 Color blindness is an

inherited sex-linked condition in

which certain sets of cones in the

retina do not function properly

Identify the number that you seein the dots

Figure 26 Light enters the eye

and focuses on the retina The two

types of light-detecting cells

that make up the retina

are called rods and cones

GPS+_341

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342 CHAPTER 11 Sound and Light

Mixing ColorsIf you have ever browsed through a paint store you have

probably seen displays where customers can select paint samplesof almost every imaginable color The colors are a result of mix-tures of pigments For example you might have mixed blue andyellow paint to produce green paint A pigment is a coloredmaterial that is used to change the color of other substancesThe color of a pigment results from the different wavelengths oflight that the pigment reflects

Mixing Colored Lights From the glowing orange of a sun-set to the deep blue of a mountain lake all the colors you see canbe made by mixing three colors of light These three colorsmdashred green and bluemdashare the primary colors of light They cor-respond to the three different types of cones in the retina ofyour eye When mixed together in equal amounts they producewhite light as Figure 28 shows Mixing the primary colors indifferent proportions can produce the colors you see

What are the primary colors of light

Paint Pigments If you were to mix equal amounts of redgreen and blue paint would you get white paint If mixing col-ors of paint were like mixing colors of light you would but mix-ing paint is different Paints are made with pigments Pigmentsproduce color as a result of the wavelengths of light they reflectPaint pigments usually are made of chemical compounds suchas titanium oxide a bright white pigment and lead chromatewhich is used for painting yellow lines on highways

Figure 28 White light is pro-

duced when the three primary col-

ors of light are mixed in equal

amounts

Color for PhotosynthesisPlant pigments determinethe wavelengths oflight for photosynthesisLeaves usually look greenbecause of the pigmentchlorophyll Chlorophyllabsorbs most wave-lengths of visible lightexcept green which itreflects However not allplants are green Researchdifferent plant pigmentsto find out how they allowplant species to survive indiverse habitats

GPS+_342

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SECTION 4 Light and Color 343

Self Check

1 Identity what colors are reflected and what colors are

absorbed if a white light shines on a red shirt

2 Discuss how the primary colors of light differ from the

primary pigment colors

3 Explain why a red apple would appear black if you

looked at it through a blue filter

4 Determine why a white fence appears to be white instead

of multicolored if all colors are present in white light

5 Think Critically Light reflected from an object passes

through a green filter then a red filter and finally a

blue filter What color will the object seem to be

Summary

Why Objects Have Color

bull The color of an object is determined by the

wavelengths of light it reflects

bull The color of a filter is the color of the light the

filter transmits

Seeing Color

bull Rod and cone cells are light-sensitive cells

found in the retina of the human eye

bull Rod cells are sensitive to dim light Cone cells

enable colors to be seen

bull There are three types of cone cells One type

responds to red light another to green light

and another to blue light

Mixing Colors

bull Red green and blue are the primary light

colors Any color of light can be created by

mixing these primary light colors

bull Any pigment color can be formed by mixing

the primary pigment colorsmdashmagenta cyan

and yellow

6 Use Percentages In the human eye there are about

120000000 rods If 90000000 rods trigger at once

what percentage of the total number of rods triggered

7 Convert Units The wavelengths of light are measured

in nanometers (nm) which equals 0000001 mm

Find the wavelength in mm of a light wave that has a

wavelength of 690 nm

Mixing Pigments You can make any pigment color by mixingdifferent amounts of the three primary pigmentsmdashmagenta(bluish red) cyan (greenish blue) and yellow In fact color print-ers use these pigments as well as black ink to make full-colorprints like the pages in this book A primary pigmentrsquos colordepends on the wavelengths of the light that it reflects Actuallypigments both absorb and reflect a range of colors in sending asingle color message to your eye For example in white lightyellow pigment appears yellow because it reflects red and greenlight but absorbs the other wavelengths of visible light The colorof a mixture of two primary pigments is determined by theprimary colors of light that both pigments reflect

Look at Figure 29 The area in the center where the colors alloverlap appears to be black because the three blended primarypigments absorb all the primary colors of light Recall that theprimary colors of light combine to produce white light They arecalled additive colors However when the primary pigment col-ors are combined they absorb all wavelengths of visible light andproduce black Because black results from the absence ofreflected light the primary pigments are called subtractive colors

Figure 29 The three primary

pigment colors appear to be black

when they are mixed

Describe how the primary pigmentcolors are similar to the primary col-ors of light

More Section Review gpesciencecom

GPS+_343

null

7230715

eng - iTunNORM 000002A9 00000000 00001B2C 00000000 0000E3C1 00000000 00006099 00000000 00004705 00000000

Design Your OwnDesign Your Own

344

Real-World ProblemWhat loud noises do you enjoy and which ones do you find annoying

Most people enjoy a music concert performed by their favorite artist or

the booming displays of fireworks on the Fourth of July Most people

enjoy these loud sounds for short periods of time However certain

other loud noises such as traffic sirens and loud talking can be

annoying Constant annoying noises are called noise pollution What

can be done to reduce noise pollution What types of barriers will best

block out noise pollution

Form a HypothesisBased on your experiences with loud noises form a hypothesis that

predicts the effectiveness of different types of barriers at blocking out

noise pollution

Test Your HypothesisMake a Plan

1 Complete the safety form

2 Decide what type of barriers or materials you will test

3 Describe exactly how you will use these materials

Goals Design an experiment

that tests the effective-

ness of various types of

barriers and materials

for blocking out noise

pollution

Test different types of

materials and barriers

to determine the best

noise blocks

Possible Materialsradio CD player horn

drum or other loud

noise source

shrubs trees concrete

walls brick walls stone

walls wooden fences

parked cars or hanging

laundry

sound meter

meterstick or metric tape

measure

Blocking NfisePollution

4 Identify the controls and variables you will use in your

experiment

5 List the steps you will use and describe each step precisely

6 Prepare a data table in your Science Journal to record your

measurements

7 Organize the steps of your experiment in logical order

Follow Your Plan

1 Ask your teacher to approve your plan and data table before

you start

2 Conduct your experiment as planned

3 Test each barrier two or three times

4 Record the results from each test in your data table in your Science Journal

Analyze Your Data1 Identify the barriers that most effectively reduced noise pollution

2 Identify the barriers that least effectively reduced noise pollution

3 Compare the effective barriers and identify common characteristics that might

explain why they reduced noise pollution

4 Compare the natural barriers you tested with the artificial barriers Which type

of barrier best reduced noise pollution

5 Compare the different types of materials the barriers were made of Which

type of material best reduced noise pollution

Conclude and Apply1 Evaluate whether your results support your hypothesis

2 Predict how your results would differ if you used a louder source of noise such

as a siren

3 Infer from your results how people living near a

busy street could reduce noise pollution

4 Identify major sources of noise pollution in or

near your home How could they be reduced

5 Research how noise pollution can be

unhealthy

LAB 345

Draw a poster illustrating how builders and

landscapers could use certain materials to

better insulate a home or office from excess

noise pollution

346 CHAPTER 11 Sound and Light

A Haiku GardenThe Four Seasons in Poems and Prints

by Stephen Addiss with Fumiko and Akira Yamamoto

Respond to the Reading1 How do the illustrations help the reader

better understand the poems2 What do you think is meant by the

word lingering in the Haiku about springsunlight

3 Linking Science and Writing Writeone haiku about summer and anotherabout fall In one poem use color tohelp you describe the season In theother use light or some property oflight to help describe the season

Research has deter-mined that there is a

connection between color and mood Warmcolors have longer wavelengths and can bemore stimulating Cool colors which haveshorter wavelengths tend to have a calmingor soothing effect on people Light and colorhave long been used as literary symbols Doesthe use of color change what you imaginewhen you read the haiku

UnderstandingLiteratureJapanese Haiku A haiku is a verse thatconsists of three lines and 17 syllables inthe Japanese language The first and thirdlines have five syllables each and themiddle line has seven syllables Why isimagination important in reading haiku

Lingering

in every pool of watermdash

spring sunlightIssa

Withered by winter

the sound of the windmdash

one-color worldBasho

Sound

1 Sound waves are compressional waves thattravel only in matter

2 The speed of sound in a material dependson the type of material as well as itstemperature

3 Loudness depends on a sound waversquos inten-sity Pitch depends on a sound waversquosfrequency

4 Sound waves are used in echolocationsonar and medical imaging

Reflection and Refractionof Light

1 Light can be absorbed reflected or trans-mitted by a material

2 When light waves are reflected theyobey the law of reflectionmdashthe angle ofincidence equals the angle of reflection

3 A light wave is refracted or bent whenit changes speed as it travels at an anglefrom one material to another

Mirrors Lenses andthe Eye

1 Plane mirrors form upright virtual images

2 Images formed by concave mirrors andconvex lenses depend on the location ofthe object relative to the focal point

3 Convex mirrors and concave lenses formvirtual upright images that are smallerthan the object

4 The lens in the human eye changes shape toproduce a sharp image on the retina

Light and Color

1 You see color when light is reflected offobjects and into your eyes

2 Cone cells in the retina are light-sensitivecells that enable you to distinguish colors

3 Red blue and green are the three primarycolors of light and can be mixed to form allother colors

4 The primary pigment colors are magentacyan and yellow

CHAPTER STUDY GUIDE 347

Use the Foldable you made at the beginningof the chapter to help you review sound and light

Interactive Tutor gpesciencecom

Complete each statement with the correctvocabulary word or phrase

1 A change in frequency due to a movingsound source is due to the

2 A flat smooth surface that reflects light andforms an image is a(n)

3 An object is if you can seethrough it clearly

4 The of a material indicates howmuch the speed of light in the materialchanges as light passes through

5 You can change the color of white paint byadding a(n) to it

6 A(n) is a reflecting surface thatcurves outward like the back of a spoon

7 The human perception of the intensity of asound wave is

Choose the word or phrase that best answerseach question

8 Which of the following best describes imageformation by a plane mirrorA) A real image is formed in front of the mirrorB) A real image is formed behind the mirrorC) A virtual image is formed in front of the

mirrorD) A virtual image is formed behind the mirror

9 For a sound with low pitch what else isalso always lowA) amplitude C) wavelengthB) frequency D) wave velocity

10 Which of the following occurs when asound source moves away from youA) The soundrsquos velocity decreasesB) The soundrsquos loudness increasesC) The soundrsquos frequency decreasesD) The soundrsquos frequency increases

Use the table below to answer question 11

11 Based on the data in the table abovewhich of the following would be the speedof sound in air at 30degCA) 3404 ms C) 3494 msB) 3464 ms D) 3534 ms

12 What happens to a light ray travelingparallel to the optical axis of a convexlens that passes through the lensA) It travels parallel to the optical axisB) It passes through the focal pointC) It is bent away from the optical axisD) It forms a virtual image

13 Light waves of which color are bent mostwhen passing through a prismA) blue C) violetB) red D) yellow

14 Which way does a concave lens bend lightA) toward its optical axisB) toward its centerC) toward its edgesD) toward its focal point

Speed of Sound in Air

Temp peed( s)

4

4

4

348 CHAPTER REVIEW

concave lens p 335concave mirror p 332convex lens p 333convex mirror p 333decibel p 322Doppler effect p 323index of refraction p 329intensity p 322

loudness p 322opaque p 327pigment p 342pitch p 323plane mirror p 331translucent p 327transparent p 327

Vocabulary PuzzleMaker gpesciencecom

Use the illustration below to answer question 15

15 Describe how the position of the candlechanged if the image of the candle movedaway from the focal point

16 Apply Acoustic scientists sometimes doresearch in rooms that absorb all soundwaves How could such a room be used tostudy how bats find their food

17 Compare White light passes through atranslucent pane of glass and shines on ashirt Both the translucent glass and theshirt appear green Compare the colors oflight that are absorbed and transmitted bythe glass and the shirt

18 Infer Most mammals including dogs andcats canrsquot see colors Infer how the retinaof a catrsquos eye might be different from theretina of a human eye

19 Determine whether a convex lens could forman image that is enlarged real and upright

20 Infer A car comes to a railroad crossingThe driver hears a trainrsquos whistle and itspitch becomes lower What can beassumed about how the train is moving

21 Compare and contrast the reflection of lightfrom a white wall with a rough surfacewith the reflection of light from a mirror

Optical axis

One

focal

length

Two

focal

lengths

Image

Ray A

Object

Focal

point

Interpreting Graphics 22 Infer why a convex mirror and a concavelens can never produce a real image

23 Predict what color a white shirt wouldappear to be if the light reflected from theshirt passed through a red filter and thenthrough a green filter

24 Explain why windows might begin to rattlewhen an airplane flies overhead

25 Communicate Some people enjoy usingsnowmobiles Others object to the noisethat they make Write a proposal for a pol-icy that seems fair to both groups for theuse of snowmobiles in a state park

CHAPTER REVIEW 349

Use the wave speed equation ν ƒλ to answer

questions 26 and 27

26 Calculate Frequency A sonar pulse has awavelength of 30 cm and a speed inwater of 1500 ms Find its frequency

27 Calculate Wavelength What is the wave-length of a sound wave with a fre-quency of 440 Hz if the speed of soundin air is 340 ms

28 Calculate Angle of Incidence A light ray isreflected from a mirror If the anglebetween the incident ray and thereflected ray is 136deg what is the angleof incidence

29 Determine Object Distance You hold anobject in front of a concave mirror witha focal length of 30 cm If you do notsee a reflected image how far from themirror is the object

30 Calculate Speed The speed of light in avacuum is 300000 kms If the index ofrefraction of water is 133 what is thespeed of light in water

More Chapter Review gpesciencecom

1 Which of the following describes the imageformed by a convex mirror

A enlarged

B inverted

C real

D virtual

Use the figure below to answer question 2

2 Which of the following describes a light raythat passes through the focal point andthen is reflected by the mirror

A It travels parallel to the optical axis

B It forms a real image

C It is reflected back through the focal point

D It forms a virtual image

3 Why does an apple look red

A It reflects red light

B It absorbs red light

C It reflects green and blue light

D It reflects all colors of light except red

Use the figure below to answer questions 4 and 5

4 When the primary colors of light are addedtogether what color appears in area H

A cyan

B magenta

C white

D yellow

5 When the primary colors of light are addedtogether what color appears in area G

A cyan

B magenta

C white

D yellow

6 Which of the following increases as the fre-quency of a sound increases

A amplitude

B intensity

C loudness

D pitch

Red Blue

Green

F

H

G K

Focal pointOptical axis

350 STANDARDIZED TEST PRACTICE

Record your answers on the answer sheet provided by your teacher or on a sheet of paper

STANDARDIZED TEST PRACTICE 351

7 Which of the following parts of the eyeenable you to see colors in bright light

A cone cells

B cornea

C lens

D rod cells

Use the graph below to answer questions 8 and 9

8 Determine how far in centimeters theimage is from the lens when the object is15 centimeters from the lens

9 How far in centimeters is the object fromthe lens when the image distance andobject distance are equal

10 A shirt has stripes that are black and whitein white light If green light shines on thisshirt what colors will the black and whitestripes be

11 If you are on a moving train what hap-pens to the pitch of a crossing bell as youapproach the crossing and then moveaway from the crossing

Use the figure below to answer question 12

12 Describe the vision problem show by thefigure and explain how this vision prob-lem can be corrected

13 Explain why the human eye can see colorsbetter in bright light than in dim light

Image Distance fora Convex Lens

Ima

ge

dis

tan

ce (

cm)

30

25

20

15

10

5 10 15 20 25 30

Object distance (cm)

Standardized Test Practice gpesciencecom

Note Units Read carefully and make note of the units used in

any measurement

  • Glencoe Physical Science with Earth Science
    • Student Edition Table of Contents
      • Unit 1 Science and Technology
        • Chapter 1 The Nature of Science
          • Launch Lab Understanding Measurements
          • Foldables
          • Section 1 The Methods of Science
            • Science Online
            • Integrate History
            • Integrate Earth Science
            • Science Online
              • Section 2 Standards of Measurement
                • Applying Math Centimeters
                • Integrate Earth Science
                • Science Online
                • MiniLAB Determining the Density of a Pencil
                • Visualizing SI Dimensions
                  • Section 3 Communicating with Graphs
                    • Applying Math Temperature
                    • MiniLAB Graphing Temperature Change
                    • Lab Whats my graph
                    • Lab Design Your Own - Developing a Measurement System
                    • Science and Language Arts Thinking in Pictures and Other Reports from My Life with Autism
                      • Chapter 1 Study Guide
                      • Chapter 1 Review
                      • Chapter 1 Standardized Test Practice
                        • Chapter 2 Science Technology and Society
                          • Lab Technology in Your Life
                          • Foldables
                          • Section 1 Science and Technology
                            • MiniLAB Researching the Past
                            • Visualizing Technology Supplying Basic Needs
                            • Science Online
                              • Section 2 Forces that Shape Technology
                                • MiniLAB Evaluating the Benefits and Consequences of Technology
                                • Integrate Environment
                                • Integrate History
                                • Applying Science What impact does the accident at Chernobyl have on the future of nuclear power
                                • Science Online
                                • Lab Who contributes CO2
                                  • Section 3 Developing Technology
                                    • Integrate Life Science
                                    • Integrate Career
                                    • Lab Model and Invent - Care Package
                                    • Oops Accidents in Science A Slippery Situation
                                      • Chapter 2 Study Guide
                                      • Chapter 2 Review
                                      • Chapter 2 Standardized Test Practice
                                          • Unit 2 Motion Forces and Energy
                                            • Chapter 3 Motion Acceleration and Forces
                                              • Launch Lab Compare Speeds
                                              • Foldables
                                              • Section 1 Describing Motion
                                                • MiniLAB Measuring Average Speed
                                                • Science Online
                                                • Applying Math Average Speed
                                                • Integrate Astronomy
                                                • Science Online
                                                  • Section 2 Acceleration
                                                    • Integrate History
                                                    • Visualizing Acceleration
                                                      • Section 3 Motion and Forces
                                                        • Science Online
                                                        • MiniLAB Comparing Friction
                                                        • Lab Force and Acceleration
                                                        • Lab Design Your Own - Comparing Motion from Different Forces
                                                        • Science and Language Arts A Brave and Startling Truth
                                                          • Chapter 3 Study Guide
                                                          • Chapter 3 Review
                                                          • Chapter 3 Standardized Test Practice
                                                            • Chapter 4 The Laws of Motion
                                                              • Launch Lab The Force of Gravity
                                                              • Foldables
                                                              • Section 1 The First Two Laws of Motion
                                                                • MiniLAB Observing Inertia
                                                                • Science Online
                                                                • Applying Math The Acceleration of a Sled Solve a Simple Equation
                                                                  • Section 2 Gravity
                                                                    • Science Online
                                                                    • Integrate Earth Science
                                                                    • MiniLAB Observing Centripetal Force
                                                                    • Lab Gravity and Air Resistance
                                                                      • Section 3 The Third Law of Motion
                                                                        • Integrate Career
                                                                        • Visualizing Rocket Motion
                                                                        • Applying Math The Momentum of a Sprinter
                                                                        • Lab The Momentum of Colliding Objects
                                                                        • Science and History Newton and the Plague
                                                                          • Chapter 4 Study Guide
                                                                          • Chapter 4 Review
                                                                          • Chapter 4 Standardized Test Practice
                                                                            • Chapter 5 Energy
                                                                              • Launch Lab Energy Conversions
                                                                              • Foldables
                                                                              • Section 1 The Nature of Energy
                                                                                • Science Online
                                                                                • Applying Math Kinetic Energy
                                                                                • MiniLAB Interpreting Data from a Slingshot
                                                                                • Integrate Language Arts
                                                                                • Applying Math Gravitational Potential Energy
                                                                                • Lab Bouncing Balls
                                                                                  • Section 2 Conservation of Energy
                                                                                    • Visualizing Energy Transformations
                                                                                    • Integrate Environment
                                                                                    • MiniLAB Transforming Energy in a Paper Clip
                                                                                    • Science Online
                                                                                    • Integrate Health
                                                                                    • Lab Design Your Own - Swinging Energy
                                                                                    • Science and History The Impossible Dream
                                                                                      • Chapter 5 Study Guide
                                                                                      • Chapter 5 Review
                                                                                      • Chapter 5 Standardized Test Practice
                                                                                        • Chapter 6 Work and Machines
                                                                                          • Launch Lab Doing Work with a Simple Machine
                                                                                          • Foldables
                                                                                          • Section 1 Work
                                                                                            • Integrate Language Arts
                                                                                            • Applying Math Work
                                                                                            • MiniLAB Calculating Your Work and Power
                                                                                            • Applying Math Power
                                                                                              • Section 2 Using Machines
                                                                                                • MiniLAB Machines Multiplying Force
                                                                                                • Science Online
                                                                                                • Integrate Chemistry
                                                                                                  • Section 3 Simple Machines
                                                                                                    • Integrate History
                                                                                                    • Visualizing Levers in the Human Body
                                                                                                    • Science Online
                                                                                                    • Lab Levers
                                                                                                    • Lab Model and Invent - Using Simple Machines
                                                                                                    • Science and Society The Science of Very Very Small
                                                                                                      • Chapter 6 Study Guide
                                                                                                      • Chapter 6 Review
                                                                                                      • Chapter 6 Standardized Test Practice
                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                          • Launch Lab Relative Sizes of Earth the Moon and the Sun
                                                                                                          • Foldables
                                                                                                          • Section 1 Earth in Space
                                                                                                            • Science Online
                                                                                                            • Integrate Physics
                                                                                                              • Section 2 Time and Seasons
                                                                                                                • MiniLAB Modeling the Suns Rays at Solstice
                                                                                                                • Lab Comparing the Angle of Sunlight to Intensity
                                                                                                                  • Section 3 Earths Moon
                                                                                                                    • Applying Math Tides
                                                                                                                    • MiniLAB Modeling Phases and Eclipses
                                                                                                                    • Integrate History
                                                                                                                    • Integrate History
                                                                                                                    • Science Online
                                                                                                                    • Visualizing Water on the Moon
                                                                                                                    • Lab Identifying the Moons Surface Features and Apollo Landing Sites
                                                                                                                    • Oops Accidents in Science Even Great Scientists Make Mistakes
                                                                                                                      • Chapter 7 Study Guide
                                                                                                                      • Chapter 7 Review
                                                                                                                      • Chapter 7 Standardized Test Practice
                                                                                                                        • Chapter 8 The Solar System
                                                                                                                          • Launch Lab The Size of the Solar System
                                                                                                                          • Foldables
                                                                                                                          • Section 1 Planet Motion
                                                                                                                            • Integrate History
                                                                                                                            • MiniLAB Plotting Retrograde Motion
                                                                                                                            • Integrate Physics
                                                                                                                            • Applying Math Heliocentric Longitude (HL)
                                                                                                                              • Section 2 The Inner Planets
                                                                                                                                • Science Online
                                                                                                                                • Integrate Chemistry
                                                                                                                                • Lab Interpreting Features of Marss Surface
                                                                                                                                  • Section 3 The Outer Planets
                                                                                                                                    • Integrate Language Arts
                                                                                                                                    • Visualizing What Galileo Saw
                                                                                                                                    • Science Online
                                                                                                                                    • MiniLAB Comparing Sizes of Outer and Inner Planets
                                                                                                                                      • Section 4 Life in the Solar System
                                                                                                                                        • Lab Design Your Own - Testing Unknown Soil Samples for Life
                                                                                                                                        • Science Stats Night Sky Wonders
                                                                                                                                          • Chapter 8 Study Guide
                                                                                                                                          • Chapter 8 Review
                                                                                                                                          • Chapter 8 Standardized Test Practice
                                                                                                                                              • Unit 3 Energy in Motion
                                                                                                                                                • Chapter 9 Heat and States of Matter
                                                                                                                                                  • Launch Lab Expansion of a Gas
                                                                                                                                                  • Foldables
                                                                                                                                                  • Section 1 Temperature and Thermal Energy
                                                                                                                                                    • Applying Math Converting to Celsius
                                                                                                                                                    • Science Online
                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                    • Applying Math Change in Thermal Energy
                                                                                                                                                      • Section 2 States of Matter
                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                        • Science Online
                                                                                                                                                        • MiniLAB Comparing States of Water
                                                                                                                                                          • Section 3 Transferring Thermal Energy
                                                                                                                                                            • MiniLAB Comparing Thermal Conductors
                                                                                                                                                            • Visualizing Convection Currents
                                                                                                                                                            • Lab Convection in Gases and Liquids
                                                                                                                                                              • Section 4 Using Thermal Energy
                                                                                                                                                                • Integrate History
                                                                                                                                                                • Science Online
                                                                                                                                                                • Lab Conduction in Gases
                                                                                                                                                                • Science Stats Surprising Thermal Energy
                                                                                                                                                                  • Chapter 9 Study Guide
                                                                                                                                                                  • Chapter 9 Review
                                                                                                                                                                  • Chapter 9 Standardized Test Practice
                                                                                                                                                                    • Chapter 10 Waves
                                                                                                                                                                      • Launch Lab How do waves transfer energy
                                                                                                                                                                      • Foldables
                                                                                                                                                                      • Section 1 The Nature of Waves
                                                                                                                                                                        • Visualizing Formation of Ocean Waves
                                                                                                                                                                        • Science Online
                                                                                                                                                                          • Section 2 Wave Properties
                                                                                                                                                                            • MiniLAB Observing Wavelength
                                                                                                                                                                            • Integrate Social Studies
                                                                                                                                                                            • Applying Math The Speed of Sound
                                                                                                                                                                            • Lab Wave Speed and Tension
                                                                                                                                                                              • Section 3 The Behavior of Waves
                                                                                                                                                                                • Science Online
                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                • MiniLAB Experimenting with Resonance
                                                                                                                                                                                • Lab Measuring Wave Properties
                                                                                                                                                                                • Science and History Making Waves
                                                                                                                                                                                  • Chapter 10 Study Guide
                                                                                                                                                                                  • Chapter 10 Review
                                                                                                                                                                                  • Chapter 10 Standardized Test Practice
                                                                                                                                                                                    • Chapter 11 Sound and Light
                                                                                                                                                                                      • Launch Lab What sound does a ruler make
                                                                                                                                                                                      • Foldables
                                                                                                                                                                                      • Section 1 Sound
                                                                                                                                                                                        • MiniLAB Comparing Intensity
                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                        • Science Online
                                                                                                                                                                                        • Applying Math Using Sonar
                                                                                                                                                                                          • Section 2 Reflection and Refraction of Light
                                                                                                                                                                                          • Section 3 Mirrors Lenses and the Eye
                                                                                                                                                                                            • Visualizing Images Formed by a Convex Lens
                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                            • MiniLAB Experimenting with Focal Lengths
                                                                                                                                                                                            • Lab Reflections of Reflections
                                                                                                                                                                                              • Section 4 Light and Color
                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Lab Design Your Own - Blocking Noise Pollution
                                                                                                                                                                                                • Science and Language Arts A Haiku Garden The Four Seasons in Poems and Print
                                                                                                                                                                                                  • Chapter 11 Study Guide
                                                                                                                                                                                                  • Chapter 11 Review
                                                                                                                                                                                                  • Chapter 11 Standardized Test Practice
                                                                                                                                                                                                    • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                      • Launch Lab Global Jigsaw Puzzle
                                                                                                                                                                                                      • Foldables
                                                                                                                                                                                                      • Section 1 Evolution of Earths Crust
                                                                                                                                                                                                        • Applying Math Spreading Distances
                                                                                                                                                                                                        • Integrate Physics
                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                          • Section 2 Earthquakes
                                                                                                                                                                                                            • MiniLAB Demonstrating Four Types of Stress
                                                                                                                                                                                                            • Visualizing Earthquake-Proof Buildings
                                                                                                                                                                                                              • Section 3 Earths Interior
                                                                                                                                                                                                              • Section 4 Volcanoes
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • MiniLAB Modeling Lava Viscosity
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                • Lab A Case for Pacific Plate Motion
                                                                                                                                                                                                                • Lab Earthquake Earthquake Wheres the earthquake
                                                                                                                                                                                                                • Science and History Volcano Weather
                                                                                                                                                                                                                  • Chapter 12 Study Guide
                                                                                                                                                                                                                  • Chapter 12 Review
                                                                                                                                                                                                                  • Chapter 12 Standardized Test Practice
                                                                                                                                                                                                                      • Unit 4 Forms of Energy
                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                          • Launch Lab Electric Circuits
                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                          • Section 1 Electric Charge
                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                            • Visualizing Lightning
                                                                                                                                                                                                                            • MiniLAB Investigate Charged Objects
                                                                                                                                                                                                                              • Section 2 Electric Current
                                                                                                                                                                                                                                • MiniLAB Investigating Battery Addition
                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                • Lab Identifying Conductors and Insulators
                                                                                                                                                                                                                                  • Section 3 Electrical Energy
                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                    • Applying Math Power Used by a Clothes Dryer
                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                    • Applying Math Electrical Energy Used by a Microwave Oven
                                                                                                                                                                                                                                    • Lab Design Your Own - Comparing Series and Parallel Circuits
                                                                                                                                                                                                                                    • Science and Language Arts Invisible Man
                                                                                                                                                                                                                                      • Chapter 13 Study Guide
                                                                                                                                                                                                                                      • Chapter 13 Review
                                                                                                                                                                                                                                      • Chapter 13 Standardized Test Practice
                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                          • Launch Lab The Strength of Magnets
                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                          • Section 1 Magnetism
                                                                                                                                                                                                                                            • MiniLAB Observing Magnetic Interference
                                                                                                                                                                                                                                            • Integrate Earth Science
                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                            • Applying Science How can magnetic parts of a junk car be salvaged
                                                                                                                                                                                                                                            • MiniLAB Making Your Own Compass
                                                                                                                                                                                                                                              • Section 2 Electricity and Magnetism
                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                  • Section 3 Producing Electric Current
                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                    • Visualizing Motors and Generators
                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                    • Lab Electricity and Magnetism
                                                                                                                                                                                                                                                    • Lab Design Your Own - Controlling Electromagnets
                                                                                                                                                                                                                                                    • Science and History Body Art
                                                                                                                                                                                                                                                      • Chapter 14 Study Guide
                                                                                                                                                                                                                                                      • Chapter 14 Review
                                                                                                                                                                                                                                                      • Chapter 14 Standardized Test Practice
                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                          • Launch Lab Can electromagnetic waves change materials
                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                          • Section 1 What are electromagnetic waves
                                                                                                                                                                                                                                                            • MiniLAB Investigating Electromagnetic Waves
                                                                                                                                                                                                                                                            • Applying Math The Speed of Light in Water
                                                                                                                                                                                                                                                              • Section 2 The Electromagnetic Spectrum
                                                                                                                                                                                                                                                                • MiniLAB Heating with Microwaves
                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                • Lab The Shape of Satellite Dishes
                                                                                                                                                                                                                                                                  • Section 3 Radio Communication
                                                                                                                                                                                                                                                                    • Visualizing Radio Broadcasts
                                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Lab Use the Internet - Radio Frequencies
                                                                                                                                                                                                                                                                    • Science and History Riding a Beam of Light
                                                                                                                                                                                                                                                                      • Chapter 15 Study Guide
                                                                                                                                                                                                                                                                      • Chapter 15 Review
                                                                                                                                                                                                                                                                      • Chapter 15 Standardized Test Practice
                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                          • Launch Lab Heating with Solar Energy
                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                          • Section 1 Fossil Fuels
                                                                                                                                                                                                                                                                            • Visualizing The Formation of Fossil Fuels
                                                                                                                                                                                                                                                                            • MiniLAB Designing an Efficient Water Heater
                                                                                                                                                                                                                                                                              • Section 2 Nuclear Energy
                                                                                                                                                                                                                                                                                • Integrate Earth Science
                                                                                                                                                                                                                                                                                • Integrate Social Science
                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                • Applying Science Can a contaminated radioactive site be reclaimed
                                                                                                                                                                                                                                                                                  • Section 3 Renewable Energy Sources
                                                                                                                                                                                                                                                                                    • MiniLAB Using Solar Power at Home
                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                    • Lab Solar Heating
                                                                                                                                                                                                                                                                                    • Lab Use the Internet How much does energy really cost
                                                                                                                                                                                                                                                                                    • Science and Society Reacting to Nuclear Energy
                                                                                                                                                                                                                                                                                      • Chapter 16 Study Guide
                                                                                                                                                                                                                                                                                      • Chapter 16 Review
                                                                                                                                                                                                                                                                                      • Chapter 16 Standardized Test Practice
                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                          • Lab Atmospheric Pressure
                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                          • Section 1 Earths Atmosphere
                                                                                                                                                                                                                                                                                            • MiniLAB Visualizing Convection
                                                                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                                                                            • Lab Visualizing a Temperature Inversion
                                                                                                                                                                                                                                                                                              • Section 2 Weather
                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Coriolis Effect
                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                  • Section 3 Climate
                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                    • Visualizing Earths Biogeophysical System
                                                                                                                                                                                                                                                                                                      • Section 4 Earths Changing Climates
                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                        • Applying Math Carbon Dioxide (CO2) Concentration
                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Investigating Microclimate
                                                                                                                                                                                                                                                                                                        • Science and Language Arts The Grapes of Wrath
                                                                                                                                                                                                                                                                                                          • Chapter 17 Study Guide
                                                                                                                                                                                                                                                                                                          • Chapter 17 Review
                                                                                                                                                                                                                                                                                                          • Chapter 17 Standardized Test Practice
                                                                                                                                                                                                                                                                                                              • Unit 5 Matter and Earth Materials
                                                                                                                                                                                                                                                                                                                • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                  • Launch Lab Demonstrate the Distillation of Water
                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                  • Section 1 Composition of Matter
                                                                                                                                                                                                                                                                                                                    • Visualizing Elements
                                                                                                                                                                                                                                                                                                                    • MiniLAB Classifying Materials
                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                    • Lab Comparing Pure Substances and Mixtures
                                                                                                                                                                                                                                                                                                                      • Section 2 Properties of Matter
                                                                                                                                                                                                                                                                                                                        • Integrate Environment
                                                                                                                                                                                                                                                                                                                        • MiniLAB Separating Ink
                                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                                        • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                        • Applying Math The Law of Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Measuring the Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Science Stats Intriguing Elements
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Study Guide
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Review
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                            • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                              • Launch Lab Inferring What You Cant Observe
                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                              • Section 1 Structure of the Atom
                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling an Aluminum Atom
                                                                                                                                                                                                                                                                                                                                • Visualizing The Atomic Model
                                                                                                                                                                                                                                                                                                                                  • Section 2 Masses of Atoms
                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                    • Applying Science How can radioactive isotopes help tell time
                                                                                                                                                                                                                                                                                                                                      • Section 3 The Periodic Table
                                                                                                                                                                                                                                                                                                                                        • MiniLAB Organizing a Personal Periodic Table
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Career
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                                                                                                                                                                        • Lab A Periodic Table of Foods
                                                                                                                                                                                                                                                                                                                                        • Lab Use the Internet Whats in a name
                                                                                                                                                                                                                                                                                                                                        • Science and History A Chilling Story
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Study Guide
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Review
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                            • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                              • Launch Lab Earth Materials at Home and School
                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                              • Section 1 Minerals
                                                                                                                                                                                                                                                                                                                                                • MiniLAB Identifying Salts Crystal System
                                                                                                                                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                • Lab Be a Mineral Detective
                                                                                                                                                                                                                                                                                                                                                  • Section 2 Igneous Rocks
                                                                                                                                                                                                                                                                                                                                                    • Applying Math Extrusive Igneous Rock Classification
                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                      • Section 3 Sedimentary Rocks
                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Evaporites
                                                                                                                                                                                                                                                                                                                                                          • Section 4 Metamorphic Rocks and the Rock Cycle
                                                                                                                                                                                                                                                                                                                                                            • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                            • Visualizing Shock Metamorphic Rock
                                                                                                                                                                                                                                                                                                                                                            • Lab Identifying Rocks
                                                                                                                                                                                                                                                                                                                                                            • Science and Society Earth Materials at Work
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Study Guide
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Review
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                  • Launch Lab Have you got the time
                                                                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                                                                  • Section 1 Weathering and Soil
                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing a Disappearing Seasoning
                                                                                                                                                                                                                                                                                                                                                                    • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                    • Lab Graphing Soil Textures
                                                                                                                                                                                                                                                                                                                                                                      • Section 2 Shaping the Landscape
                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Runoff
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                          • Section 3 Groundwater
                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Porosity Volume
                                                                                                                                                                                                                                                                                                                                                                            • Visualizing The Role of Groundwater in Shaping Earths Surface
                                                                                                                                                                                                                                                                                                                                                                            • Integrate Environment
                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                              • Section 4 Geologic Time
                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                                                                                                • Lab Its about time - relative that is
                                                                                                                                                                                                                                                                                                                                                                                • Science and Society Tapping into the Underground
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Review
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                      • Unit 6 Interactions of Matter
                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                          • Lab Chemical Bonds and Mixing
                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Stability in Bonding
                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                            • Lab Atomic Trading Cards
                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Types of Bonds
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Observing a Bond Type
                                                                                                                                                                                                                                                                                                                                                                                                • Visualizing Polar Molecules
                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Writing Formulas and Naming Compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math Determining a Formula
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Science Can you name binary ionic compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Making a Hydrate
                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Model and Invent - Modeling Chemical Bonding
                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Sticky Subject
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Review
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab RustingmdashA Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Chemical Changes
                                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Designing a Team Equation
                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Chemical Equations
                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math Barium Sulfate Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Classifying Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 4 Reaction Rates and Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing Chemical Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Creating a Colorful Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab To Glow or Not to Glow
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Investigating Reaction Conditions
                                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Clumsy Move Pays Off
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Review
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab Magic Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 How Solutions Form
                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                                                                                                                                                                                                                                                            • Visualizing Metal Alloys
                                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Observing the Effect of Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Solubility and Concentration
                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Acids Bases and Salts
                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing Acid Relief
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Strength of Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Determining Acidity
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Saturated Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and Society Acid Rain
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab The Size of a Nucleus
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Strong Force
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Nuclear Decay
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Detecting Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math The Age of Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Social Studies
                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Nuclear Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling a Nuclear Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Visualizing PET Scans
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Chain Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Model and Invent Modeling Transmutations
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and History The Nuclear Alchemist
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 26 Stars and Galaxies
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab Stars in the Sky
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Observing the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling a Telescope
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math The Magnifying Power of Telescopes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Evolution of Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Counting Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing H-R Diagrams of Star Clusters
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Star Cluster Age
                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 3 Galaxies and the Milky Way
                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 4 Cosmology
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Lab Model and Invent - Expansion of the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Science and Language Arts Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Student Resources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Skill Handbook
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Scientific Methods
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Safety Symbols
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Safety in the Science Laboratory
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Math Skill Handbook
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Math Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Science Applications
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Formulas
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Extra Math Problems
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Reference Handbook
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Minerals
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Physical Science Reference Tables
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Periodic Table of the Elements
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Weather Map Symbols
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                • EnglishSpanish Glossary
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Index
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Credits
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Students Workbooks
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter Resources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 1 The Nature of Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 2 Science Technology and Society
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 3 Motion Acceleration and Forces
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 4 The Laws of Motion
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 5 Energy
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 6 Work and Machines
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 8 The Solar System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 9 Heat and States of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 10 Waves
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 11 Sound and Light
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 26 Stars and Galaxies
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Additional Resources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Dinah Zikes Teaching Science with Foldables
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Page 22: 706 S1 318-326 GPS09 - Light-and-Sound - home · PDF fileWhat sound does a ruler make? ... sound waves cannot travel in empty space where there are no particles. ... sound travels

SECTION 4 Light and Color 339

Why Objects Have ColorWhy do some apples appear red while others look green or

yellow An objectrsquos color depends on the wavelengths of light itreflects Recall that white light is a blend of all colors of visiblelight When a red apple is struck by white light it reflects redlight back to your eyes and absorbs all of the other colorsFigure 24 shows white light striking a green leaf Only the wave-lengths corresponding to green light are reflected to your eyes

Although some objects appear to be black black isnrsquot acolor Black is the absence of visible light Objects that appearblack absorb all colors of light and reflect little or no light backto your eyes White objects appear to be white because theyreflect all colors of visible light

Why does a white object appear white

Colored Filters Wearing tinted glasses changesthe color of almost everything you see If the lensesare yellow the world takes on a golden glow If theyare rose colored everything looks rosy Somethingsimilar would occur if you placed a colored clearplastic sheet over this white page The paper wouldappear to be the same color as the plastic The plasticsheet and the tinted lenses are filters A filter is atransparent material that transmits one or more col-ors of light but absorbs all others The color of a fil-ter is the color of the light that it transmits

Light and Color

Reading Guide

Explain how you see color Describe the difference between

light color and pigment color Predict what happens when dif-

ferent colors are mixed

From traffic lights to great works of

art color is an important part of your

world

Review Vocabulary

retina inner layer of the eye con-

taining cells that convert light

images into electrical signals

New Vocabulary

bull pigment

Figure 24 This leaf absorbs all

wavelengths of visible light except

the wavelengths you see as green

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340 CHAPTER 11 Sound and Light

Looking Through Colored Filters Figure 25 shows howthe color of an object can change when you look at it throughvarious colored filters The cooler looks blue under white lightbecause it reflects only the wavelengths of blue light that strikeit If you look at the cooler through a blue filter the cooler stilllooks blue because the blue filter transmits the reflected bluelight However if you look at the cooler through a red filter thecooler seems black because the red filter blocks the blue lightreflected by the cooler

Why does a blue object appear black whenviewed through a red filter

Seeing ColorAs you approach a busy intersection the color of the traffic

light changes from green to yellow to red On the cross street thecolor changes from red to green At a busy intersection trafficsafety depends on your ability to detect color changes rapidlyHow do you see colors

Light and the Eye In a healthy eye light enters the eyethrough the cornea is focused by the lens and finally forms animage on the retina The retina is made up of two types of cellsthat absorb light as shown in Figure 26 When these cellsabsorb light energy chemical reactions convert light energy intonerve impulses that are transmitted to the brain One type ofcell in the retina called a cone enables you to distinguish colorsand detailed shapes of objects Cones need bright light to gener-ate nerve impulses so they do not operate in dim light As aresult even brightly colored objects might look gray or black indim light

Figure 25 The color of this

cooler changes when viewed

through different color filters

Topic Color BlindnessVisit for Web

links to information about the

causes of color blindness

Activity Research the causes

and types of color blindness Find

out how cones are related to the

ability to distinguish colors

gpesciencecom

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SECTION 4 Light and Color 341

Cones and Rods Your eyes have three types of cones each ofwhich responds to a different range of wavelengths Red conesrespond to mostly red and yellow light Green cones respond tomostly yellow and green light Blue cones respond to mostlyblue and violet light The second type of cell in the retina calleda rod is sensitive to dim light and enables you to see at nightHowever rod cells do not enable you to see colors

Interpreting Color Why does a bananalook yellow The light reflected by the

banana causes the cone cells that are sensitive to red and greenlight to send signals to your brain Your brain could get the samesignal if a mixture of red light and green light reached your eyesThis mixture also would cause your red and green cones torespond and you would see the color yellow As a result lightwith wavelengths corresponding to yellow light and light that isa mixture of red and green light both cause the color yellow tobe seen What happens when you look at a white shirt You seewhite when all wavelengths of visible light enters your eyes Thenall three sets of cones cells send signals to the brain The com-bination of these signals cause you to see the shirt as white

Color Blindness If one or more of your sets of cone cellsdo not function properly you might not be able to distinguishcertain colors This condition is called color blindness orcolor deficiency About eight percent of men and one-halfpercent of women have some form of color blindness Themost common form of color blindness makes it difficult todistinguish between red and green Figure 27 shows an imagethat is used in a test for redndashgreen color blindness Becausered and green are used in traffic signals drivers and pedestri-ans must be able to identify them

Retina

Rod

Cone

Lens

Figure 27 Color blindness is an

inherited sex-linked condition in

which certain sets of cones in the

retina do not function properly

Identify the number that you seein the dots

Figure 26 Light enters the eye

and focuses on the retina The two

types of light-detecting cells

that make up the retina

are called rods and cones

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342 CHAPTER 11 Sound and Light

Mixing ColorsIf you have ever browsed through a paint store you have

probably seen displays where customers can select paint samplesof almost every imaginable color The colors are a result of mix-tures of pigments For example you might have mixed blue andyellow paint to produce green paint A pigment is a coloredmaterial that is used to change the color of other substancesThe color of a pigment results from the different wavelengths oflight that the pigment reflects

Mixing Colored Lights From the glowing orange of a sun-set to the deep blue of a mountain lake all the colors you see canbe made by mixing three colors of light These three colorsmdashred green and bluemdashare the primary colors of light They cor-respond to the three different types of cones in the retina ofyour eye When mixed together in equal amounts they producewhite light as Figure 28 shows Mixing the primary colors indifferent proportions can produce the colors you see

What are the primary colors of light

Paint Pigments If you were to mix equal amounts of redgreen and blue paint would you get white paint If mixing col-ors of paint were like mixing colors of light you would but mix-ing paint is different Paints are made with pigments Pigmentsproduce color as a result of the wavelengths of light they reflectPaint pigments usually are made of chemical compounds suchas titanium oxide a bright white pigment and lead chromatewhich is used for painting yellow lines on highways

Figure 28 White light is pro-

duced when the three primary col-

ors of light are mixed in equal

amounts

Color for PhotosynthesisPlant pigments determinethe wavelengths oflight for photosynthesisLeaves usually look greenbecause of the pigmentchlorophyll Chlorophyllabsorbs most wave-lengths of visible lightexcept green which itreflects However not allplants are green Researchdifferent plant pigmentsto find out how they allowplant species to survive indiverse habitats

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SECTION 4 Light and Color 343

Self Check

1 Identity what colors are reflected and what colors are

absorbed if a white light shines on a red shirt

2 Discuss how the primary colors of light differ from the

primary pigment colors

3 Explain why a red apple would appear black if you

looked at it through a blue filter

4 Determine why a white fence appears to be white instead

of multicolored if all colors are present in white light

5 Think Critically Light reflected from an object passes

through a green filter then a red filter and finally a

blue filter What color will the object seem to be

Summary

Why Objects Have Color

bull The color of an object is determined by the

wavelengths of light it reflects

bull The color of a filter is the color of the light the

filter transmits

Seeing Color

bull Rod and cone cells are light-sensitive cells

found in the retina of the human eye

bull Rod cells are sensitive to dim light Cone cells

enable colors to be seen

bull There are three types of cone cells One type

responds to red light another to green light

and another to blue light

Mixing Colors

bull Red green and blue are the primary light

colors Any color of light can be created by

mixing these primary light colors

bull Any pigment color can be formed by mixing

the primary pigment colorsmdashmagenta cyan

and yellow

6 Use Percentages In the human eye there are about

120000000 rods If 90000000 rods trigger at once

what percentage of the total number of rods triggered

7 Convert Units The wavelengths of light are measured

in nanometers (nm) which equals 0000001 mm

Find the wavelength in mm of a light wave that has a

wavelength of 690 nm

Mixing Pigments You can make any pigment color by mixingdifferent amounts of the three primary pigmentsmdashmagenta(bluish red) cyan (greenish blue) and yellow In fact color print-ers use these pigments as well as black ink to make full-colorprints like the pages in this book A primary pigmentrsquos colordepends on the wavelengths of the light that it reflects Actuallypigments both absorb and reflect a range of colors in sending asingle color message to your eye For example in white lightyellow pigment appears yellow because it reflects red and greenlight but absorbs the other wavelengths of visible light The colorof a mixture of two primary pigments is determined by theprimary colors of light that both pigments reflect

Look at Figure 29 The area in the center where the colors alloverlap appears to be black because the three blended primarypigments absorb all the primary colors of light Recall that theprimary colors of light combine to produce white light They arecalled additive colors However when the primary pigment col-ors are combined they absorb all wavelengths of visible light andproduce black Because black results from the absence ofreflected light the primary pigments are called subtractive colors

Figure 29 The three primary

pigment colors appear to be black

when they are mixed

Describe how the primary pigmentcolors are similar to the primary col-ors of light

More Section Review gpesciencecom

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Design Your OwnDesign Your Own

344

Real-World ProblemWhat loud noises do you enjoy and which ones do you find annoying

Most people enjoy a music concert performed by their favorite artist or

the booming displays of fireworks on the Fourth of July Most people

enjoy these loud sounds for short periods of time However certain

other loud noises such as traffic sirens and loud talking can be

annoying Constant annoying noises are called noise pollution What

can be done to reduce noise pollution What types of barriers will best

block out noise pollution

Form a HypothesisBased on your experiences with loud noises form a hypothesis that

predicts the effectiveness of different types of barriers at blocking out

noise pollution

Test Your HypothesisMake a Plan

1 Complete the safety form

2 Decide what type of barriers or materials you will test

3 Describe exactly how you will use these materials

Goals Design an experiment

that tests the effective-

ness of various types of

barriers and materials

for blocking out noise

pollution

Test different types of

materials and barriers

to determine the best

noise blocks

Possible Materialsradio CD player horn

drum or other loud

noise source

shrubs trees concrete

walls brick walls stone

walls wooden fences

parked cars or hanging

laundry

sound meter

meterstick or metric tape

measure

Blocking NfisePollution

4 Identify the controls and variables you will use in your

experiment

5 List the steps you will use and describe each step precisely

6 Prepare a data table in your Science Journal to record your

measurements

7 Organize the steps of your experiment in logical order

Follow Your Plan

1 Ask your teacher to approve your plan and data table before

you start

2 Conduct your experiment as planned

3 Test each barrier two or three times

4 Record the results from each test in your data table in your Science Journal

Analyze Your Data1 Identify the barriers that most effectively reduced noise pollution

2 Identify the barriers that least effectively reduced noise pollution

3 Compare the effective barriers and identify common characteristics that might

explain why they reduced noise pollution

4 Compare the natural barriers you tested with the artificial barriers Which type

of barrier best reduced noise pollution

5 Compare the different types of materials the barriers were made of Which

type of material best reduced noise pollution

Conclude and Apply1 Evaluate whether your results support your hypothesis

2 Predict how your results would differ if you used a louder source of noise such

as a siren

3 Infer from your results how people living near a

busy street could reduce noise pollution

4 Identify major sources of noise pollution in or

near your home How could they be reduced

5 Research how noise pollution can be

unhealthy

LAB 345

Draw a poster illustrating how builders and

landscapers could use certain materials to

better insulate a home or office from excess

noise pollution

346 CHAPTER 11 Sound and Light

A Haiku GardenThe Four Seasons in Poems and Prints

by Stephen Addiss with Fumiko and Akira Yamamoto

Respond to the Reading1 How do the illustrations help the reader

better understand the poems2 What do you think is meant by the

word lingering in the Haiku about springsunlight

3 Linking Science and Writing Writeone haiku about summer and anotherabout fall In one poem use color tohelp you describe the season In theother use light or some property oflight to help describe the season

Research has deter-mined that there is a

connection between color and mood Warmcolors have longer wavelengths and can bemore stimulating Cool colors which haveshorter wavelengths tend to have a calmingor soothing effect on people Light and colorhave long been used as literary symbols Doesthe use of color change what you imaginewhen you read the haiku

UnderstandingLiteratureJapanese Haiku A haiku is a verse thatconsists of three lines and 17 syllables inthe Japanese language The first and thirdlines have five syllables each and themiddle line has seven syllables Why isimagination important in reading haiku

Lingering

in every pool of watermdash

spring sunlightIssa

Withered by winter

the sound of the windmdash

one-color worldBasho

Sound

1 Sound waves are compressional waves thattravel only in matter

2 The speed of sound in a material dependson the type of material as well as itstemperature

3 Loudness depends on a sound waversquos inten-sity Pitch depends on a sound waversquosfrequency

4 Sound waves are used in echolocationsonar and medical imaging

Reflection and Refractionof Light

1 Light can be absorbed reflected or trans-mitted by a material

2 When light waves are reflected theyobey the law of reflectionmdashthe angle ofincidence equals the angle of reflection

3 A light wave is refracted or bent whenit changes speed as it travels at an anglefrom one material to another

Mirrors Lenses andthe Eye

1 Plane mirrors form upright virtual images

2 Images formed by concave mirrors andconvex lenses depend on the location ofthe object relative to the focal point

3 Convex mirrors and concave lenses formvirtual upright images that are smallerthan the object

4 The lens in the human eye changes shape toproduce a sharp image on the retina

Light and Color

1 You see color when light is reflected offobjects and into your eyes

2 Cone cells in the retina are light-sensitivecells that enable you to distinguish colors

3 Red blue and green are the three primarycolors of light and can be mixed to form allother colors

4 The primary pigment colors are magentacyan and yellow

CHAPTER STUDY GUIDE 347

Use the Foldable you made at the beginningof the chapter to help you review sound and light

Interactive Tutor gpesciencecom

Complete each statement with the correctvocabulary word or phrase

1 A change in frequency due to a movingsound source is due to the

2 A flat smooth surface that reflects light andforms an image is a(n)

3 An object is if you can seethrough it clearly

4 The of a material indicates howmuch the speed of light in the materialchanges as light passes through

5 You can change the color of white paint byadding a(n) to it

6 A(n) is a reflecting surface thatcurves outward like the back of a spoon

7 The human perception of the intensity of asound wave is

Choose the word or phrase that best answerseach question

8 Which of the following best describes imageformation by a plane mirrorA) A real image is formed in front of the mirrorB) A real image is formed behind the mirrorC) A virtual image is formed in front of the

mirrorD) A virtual image is formed behind the mirror

9 For a sound with low pitch what else isalso always lowA) amplitude C) wavelengthB) frequency D) wave velocity

10 Which of the following occurs when asound source moves away from youA) The soundrsquos velocity decreasesB) The soundrsquos loudness increasesC) The soundrsquos frequency decreasesD) The soundrsquos frequency increases

Use the table below to answer question 11

11 Based on the data in the table abovewhich of the following would be the speedof sound in air at 30degCA) 3404 ms C) 3494 msB) 3464 ms D) 3534 ms

12 What happens to a light ray travelingparallel to the optical axis of a convexlens that passes through the lensA) It travels parallel to the optical axisB) It passes through the focal pointC) It is bent away from the optical axisD) It forms a virtual image

13 Light waves of which color are bent mostwhen passing through a prismA) blue C) violetB) red D) yellow

14 Which way does a concave lens bend lightA) toward its optical axisB) toward its centerC) toward its edgesD) toward its focal point

Speed of Sound in Air

Temp peed( s)

4

4

4

348 CHAPTER REVIEW

concave lens p 335concave mirror p 332convex lens p 333convex mirror p 333decibel p 322Doppler effect p 323index of refraction p 329intensity p 322

loudness p 322opaque p 327pigment p 342pitch p 323plane mirror p 331translucent p 327transparent p 327

Vocabulary PuzzleMaker gpesciencecom

Use the illustration below to answer question 15

15 Describe how the position of the candlechanged if the image of the candle movedaway from the focal point

16 Apply Acoustic scientists sometimes doresearch in rooms that absorb all soundwaves How could such a room be used tostudy how bats find their food

17 Compare White light passes through atranslucent pane of glass and shines on ashirt Both the translucent glass and theshirt appear green Compare the colors oflight that are absorbed and transmitted bythe glass and the shirt

18 Infer Most mammals including dogs andcats canrsquot see colors Infer how the retinaof a catrsquos eye might be different from theretina of a human eye

19 Determine whether a convex lens could forman image that is enlarged real and upright

20 Infer A car comes to a railroad crossingThe driver hears a trainrsquos whistle and itspitch becomes lower What can beassumed about how the train is moving

21 Compare and contrast the reflection of lightfrom a white wall with a rough surfacewith the reflection of light from a mirror

Optical axis

One

focal

length

Two

focal

lengths

Image

Ray A

Object

Focal

point

Interpreting Graphics 22 Infer why a convex mirror and a concavelens can never produce a real image

23 Predict what color a white shirt wouldappear to be if the light reflected from theshirt passed through a red filter and thenthrough a green filter

24 Explain why windows might begin to rattlewhen an airplane flies overhead

25 Communicate Some people enjoy usingsnowmobiles Others object to the noisethat they make Write a proposal for a pol-icy that seems fair to both groups for theuse of snowmobiles in a state park

CHAPTER REVIEW 349

Use the wave speed equation ν ƒλ to answer

questions 26 and 27

26 Calculate Frequency A sonar pulse has awavelength of 30 cm and a speed inwater of 1500 ms Find its frequency

27 Calculate Wavelength What is the wave-length of a sound wave with a fre-quency of 440 Hz if the speed of soundin air is 340 ms

28 Calculate Angle of Incidence A light ray isreflected from a mirror If the anglebetween the incident ray and thereflected ray is 136deg what is the angleof incidence

29 Determine Object Distance You hold anobject in front of a concave mirror witha focal length of 30 cm If you do notsee a reflected image how far from themirror is the object

30 Calculate Speed The speed of light in avacuum is 300000 kms If the index ofrefraction of water is 133 what is thespeed of light in water

More Chapter Review gpesciencecom

1 Which of the following describes the imageformed by a convex mirror

A enlarged

B inverted

C real

D virtual

Use the figure below to answer question 2

2 Which of the following describes a light raythat passes through the focal point andthen is reflected by the mirror

A It travels parallel to the optical axis

B It forms a real image

C It is reflected back through the focal point

D It forms a virtual image

3 Why does an apple look red

A It reflects red light

B It absorbs red light

C It reflects green and blue light

D It reflects all colors of light except red

Use the figure below to answer questions 4 and 5

4 When the primary colors of light are addedtogether what color appears in area H

A cyan

B magenta

C white

D yellow

5 When the primary colors of light are addedtogether what color appears in area G

A cyan

B magenta

C white

D yellow

6 Which of the following increases as the fre-quency of a sound increases

A amplitude

B intensity

C loudness

D pitch

Red Blue

Green

F

H

G K

Focal pointOptical axis

350 STANDARDIZED TEST PRACTICE

Record your answers on the answer sheet provided by your teacher or on a sheet of paper

STANDARDIZED TEST PRACTICE 351

7 Which of the following parts of the eyeenable you to see colors in bright light

A cone cells

B cornea

C lens

D rod cells

Use the graph below to answer questions 8 and 9

8 Determine how far in centimeters theimage is from the lens when the object is15 centimeters from the lens

9 How far in centimeters is the object fromthe lens when the image distance andobject distance are equal

10 A shirt has stripes that are black and whitein white light If green light shines on thisshirt what colors will the black and whitestripes be

11 If you are on a moving train what hap-pens to the pitch of a crossing bell as youapproach the crossing and then moveaway from the crossing

Use the figure below to answer question 12

12 Describe the vision problem show by thefigure and explain how this vision prob-lem can be corrected

13 Explain why the human eye can see colorsbetter in bright light than in dim light

Image Distance fora Convex Lens

Ima

ge

dis

tan

ce (

cm)

30

25

20

15

10

5 10 15 20 25 30

Object distance (cm)

Standardized Test Practice gpesciencecom

Note Units Read carefully and make note of the units used in

any measurement

  • Glencoe Physical Science with Earth Science
    • Student Edition Table of Contents
      • Unit 1 Science and Technology
        • Chapter 1 The Nature of Science
          • Launch Lab Understanding Measurements
          • Foldables
          • Section 1 The Methods of Science
            • Science Online
            • Integrate History
            • Integrate Earth Science
            • Science Online
              • Section 2 Standards of Measurement
                • Applying Math Centimeters
                • Integrate Earth Science
                • Science Online
                • MiniLAB Determining the Density of a Pencil
                • Visualizing SI Dimensions
                  • Section 3 Communicating with Graphs
                    • Applying Math Temperature
                    • MiniLAB Graphing Temperature Change
                    • Lab Whats my graph
                    • Lab Design Your Own - Developing a Measurement System
                    • Science and Language Arts Thinking in Pictures and Other Reports from My Life with Autism
                      • Chapter 1 Study Guide
                      • Chapter 1 Review
                      • Chapter 1 Standardized Test Practice
                        • Chapter 2 Science Technology and Society
                          • Lab Technology in Your Life
                          • Foldables
                          • Section 1 Science and Technology
                            • MiniLAB Researching the Past
                            • Visualizing Technology Supplying Basic Needs
                            • Science Online
                              • Section 2 Forces that Shape Technology
                                • MiniLAB Evaluating the Benefits and Consequences of Technology
                                • Integrate Environment
                                • Integrate History
                                • Applying Science What impact does the accident at Chernobyl have on the future of nuclear power
                                • Science Online
                                • Lab Who contributes CO2
                                  • Section 3 Developing Technology
                                    • Integrate Life Science
                                    • Integrate Career
                                    • Lab Model and Invent - Care Package
                                    • Oops Accidents in Science A Slippery Situation
                                      • Chapter 2 Study Guide
                                      • Chapter 2 Review
                                      • Chapter 2 Standardized Test Practice
                                          • Unit 2 Motion Forces and Energy
                                            • Chapter 3 Motion Acceleration and Forces
                                              • Launch Lab Compare Speeds
                                              • Foldables
                                              • Section 1 Describing Motion
                                                • MiniLAB Measuring Average Speed
                                                • Science Online
                                                • Applying Math Average Speed
                                                • Integrate Astronomy
                                                • Science Online
                                                  • Section 2 Acceleration
                                                    • Integrate History
                                                    • Visualizing Acceleration
                                                      • Section 3 Motion and Forces
                                                        • Science Online
                                                        • MiniLAB Comparing Friction
                                                        • Lab Force and Acceleration
                                                        • Lab Design Your Own - Comparing Motion from Different Forces
                                                        • Science and Language Arts A Brave and Startling Truth
                                                          • Chapter 3 Study Guide
                                                          • Chapter 3 Review
                                                          • Chapter 3 Standardized Test Practice
                                                            • Chapter 4 The Laws of Motion
                                                              • Launch Lab The Force of Gravity
                                                              • Foldables
                                                              • Section 1 The First Two Laws of Motion
                                                                • MiniLAB Observing Inertia
                                                                • Science Online
                                                                • Applying Math The Acceleration of a Sled Solve a Simple Equation
                                                                  • Section 2 Gravity
                                                                    • Science Online
                                                                    • Integrate Earth Science
                                                                    • MiniLAB Observing Centripetal Force
                                                                    • Lab Gravity and Air Resistance
                                                                      • Section 3 The Third Law of Motion
                                                                        • Integrate Career
                                                                        • Visualizing Rocket Motion
                                                                        • Applying Math The Momentum of a Sprinter
                                                                        • Lab The Momentum of Colliding Objects
                                                                        • Science and History Newton and the Plague
                                                                          • Chapter 4 Study Guide
                                                                          • Chapter 4 Review
                                                                          • Chapter 4 Standardized Test Practice
                                                                            • Chapter 5 Energy
                                                                              • Launch Lab Energy Conversions
                                                                              • Foldables
                                                                              • Section 1 The Nature of Energy
                                                                                • Science Online
                                                                                • Applying Math Kinetic Energy
                                                                                • MiniLAB Interpreting Data from a Slingshot
                                                                                • Integrate Language Arts
                                                                                • Applying Math Gravitational Potential Energy
                                                                                • Lab Bouncing Balls
                                                                                  • Section 2 Conservation of Energy
                                                                                    • Visualizing Energy Transformations
                                                                                    • Integrate Environment
                                                                                    • MiniLAB Transforming Energy in a Paper Clip
                                                                                    • Science Online
                                                                                    • Integrate Health
                                                                                    • Lab Design Your Own - Swinging Energy
                                                                                    • Science and History The Impossible Dream
                                                                                      • Chapter 5 Study Guide
                                                                                      • Chapter 5 Review
                                                                                      • Chapter 5 Standardized Test Practice
                                                                                        • Chapter 6 Work and Machines
                                                                                          • Launch Lab Doing Work with a Simple Machine
                                                                                          • Foldables
                                                                                          • Section 1 Work
                                                                                            • Integrate Language Arts
                                                                                            • Applying Math Work
                                                                                            • MiniLAB Calculating Your Work and Power
                                                                                            • Applying Math Power
                                                                                              • Section 2 Using Machines
                                                                                                • MiniLAB Machines Multiplying Force
                                                                                                • Science Online
                                                                                                • Integrate Chemistry
                                                                                                  • Section 3 Simple Machines
                                                                                                    • Integrate History
                                                                                                    • Visualizing Levers in the Human Body
                                                                                                    • Science Online
                                                                                                    • Lab Levers
                                                                                                    • Lab Model and Invent - Using Simple Machines
                                                                                                    • Science and Society The Science of Very Very Small
                                                                                                      • Chapter 6 Study Guide
                                                                                                      • Chapter 6 Review
                                                                                                      • Chapter 6 Standardized Test Practice
                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                          • Launch Lab Relative Sizes of Earth the Moon and the Sun
                                                                                                          • Foldables
                                                                                                          • Section 1 Earth in Space
                                                                                                            • Science Online
                                                                                                            • Integrate Physics
                                                                                                              • Section 2 Time and Seasons
                                                                                                                • MiniLAB Modeling the Suns Rays at Solstice
                                                                                                                • Lab Comparing the Angle of Sunlight to Intensity
                                                                                                                  • Section 3 Earths Moon
                                                                                                                    • Applying Math Tides
                                                                                                                    • MiniLAB Modeling Phases and Eclipses
                                                                                                                    • Integrate History
                                                                                                                    • Integrate History
                                                                                                                    • Science Online
                                                                                                                    • Visualizing Water on the Moon
                                                                                                                    • Lab Identifying the Moons Surface Features and Apollo Landing Sites
                                                                                                                    • Oops Accidents in Science Even Great Scientists Make Mistakes
                                                                                                                      • Chapter 7 Study Guide
                                                                                                                      • Chapter 7 Review
                                                                                                                      • Chapter 7 Standardized Test Practice
                                                                                                                        • Chapter 8 The Solar System
                                                                                                                          • Launch Lab The Size of the Solar System
                                                                                                                          • Foldables
                                                                                                                          • Section 1 Planet Motion
                                                                                                                            • Integrate History
                                                                                                                            • MiniLAB Plotting Retrograde Motion
                                                                                                                            • Integrate Physics
                                                                                                                            • Applying Math Heliocentric Longitude (HL)
                                                                                                                              • Section 2 The Inner Planets
                                                                                                                                • Science Online
                                                                                                                                • Integrate Chemistry
                                                                                                                                • Lab Interpreting Features of Marss Surface
                                                                                                                                  • Section 3 The Outer Planets
                                                                                                                                    • Integrate Language Arts
                                                                                                                                    • Visualizing What Galileo Saw
                                                                                                                                    • Science Online
                                                                                                                                    • MiniLAB Comparing Sizes of Outer and Inner Planets
                                                                                                                                      • Section 4 Life in the Solar System
                                                                                                                                        • Lab Design Your Own - Testing Unknown Soil Samples for Life
                                                                                                                                        • Science Stats Night Sky Wonders
                                                                                                                                          • Chapter 8 Study Guide
                                                                                                                                          • Chapter 8 Review
                                                                                                                                          • Chapter 8 Standardized Test Practice
                                                                                                                                              • Unit 3 Energy in Motion
                                                                                                                                                • Chapter 9 Heat and States of Matter
                                                                                                                                                  • Launch Lab Expansion of a Gas
                                                                                                                                                  • Foldables
                                                                                                                                                  • Section 1 Temperature and Thermal Energy
                                                                                                                                                    • Applying Math Converting to Celsius
                                                                                                                                                    • Science Online
                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                    • Applying Math Change in Thermal Energy
                                                                                                                                                      • Section 2 States of Matter
                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                        • Science Online
                                                                                                                                                        • MiniLAB Comparing States of Water
                                                                                                                                                          • Section 3 Transferring Thermal Energy
                                                                                                                                                            • MiniLAB Comparing Thermal Conductors
                                                                                                                                                            • Visualizing Convection Currents
                                                                                                                                                            • Lab Convection in Gases and Liquids
                                                                                                                                                              • Section 4 Using Thermal Energy
                                                                                                                                                                • Integrate History
                                                                                                                                                                • Science Online
                                                                                                                                                                • Lab Conduction in Gases
                                                                                                                                                                • Science Stats Surprising Thermal Energy
                                                                                                                                                                  • Chapter 9 Study Guide
                                                                                                                                                                  • Chapter 9 Review
                                                                                                                                                                  • Chapter 9 Standardized Test Practice
                                                                                                                                                                    • Chapter 10 Waves
                                                                                                                                                                      • Launch Lab How do waves transfer energy
                                                                                                                                                                      • Foldables
                                                                                                                                                                      • Section 1 The Nature of Waves
                                                                                                                                                                        • Visualizing Formation of Ocean Waves
                                                                                                                                                                        • Science Online
                                                                                                                                                                          • Section 2 Wave Properties
                                                                                                                                                                            • MiniLAB Observing Wavelength
                                                                                                                                                                            • Integrate Social Studies
                                                                                                                                                                            • Applying Math The Speed of Sound
                                                                                                                                                                            • Lab Wave Speed and Tension
                                                                                                                                                                              • Section 3 The Behavior of Waves
                                                                                                                                                                                • Science Online
                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                • MiniLAB Experimenting with Resonance
                                                                                                                                                                                • Lab Measuring Wave Properties
                                                                                                                                                                                • Science and History Making Waves
                                                                                                                                                                                  • Chapter 10 Study Guide
                                                                                                                                                                                  • Chapter 10 Review
                                                                                                                                                                                  • Chapter 10 Standardized Test Practice
                                                                                                                                                                                    • Chapter 11 Sound and Light
                                                                                                                                                                                      • Launch Lab What sound does a ruler make
                                                                                                                                                                                      • Foldables
                                                                                                                                                                                      • Section 1 Sound
                                                                                                                                                                                        • MiniLAB Comparing Intensity
                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                        • Science Online
                                                                                                                                                                                        • Applying Math Using Sonar
                                                                                                                                                                                          • Section 2 Reflection and Refraction of Light
                                                                                                                                                                                          • Section 3 Mirrors Lenses and the Eye
                                                                                                                                                                                            • Visualizing Images Formed by a Convex Lens
                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                            • MiniLAB Experimenting with Focal Lengths
                                                                                                                                                                                            • Lab Reflections of Reflections
                                                                                                                                                                                              • Section 4 Light and Color
                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Lab Design Your Own - Blocking Noise Pollution
                                                                                                                                                                                                • Science and Language Arts A Haiku Garden The Four Seasons in Poems and Print
                                                                                                                                                                                                  • Chapter 11 Study Guide
                                                                                                                                                                                                  • Chapter 11 Review
                                                                                                                                                                                                  • Chapter 11 Standardized Test Practice
                                                                                                                                                                                                    • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                      • Launch Lab Global Jigsaw Puzzle
                                                                                                                                                                                                      • Foldables
                                                                                                                                                                                                      • Section 1 Evolution of Earths Crust
                                                                                                                                                                                                        • Applying Math Spreading Distances
                                                                                                                                                                                                        • Integrate Physics
                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                          • Section 2 Earthquakes
                                                                                                                                                                                                            • MiniLAB Demonstrating Four Types of Stress
                                                                                                                                                                                                            • Visualizing Earthquake-Proof Buildings
                                                                                                                                                                                                              • Section 3 Earths Interior
                                                                                                                                                                                                              • Section 4 Volcanoes
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • MiniLAB Modeling Lava Viscosity
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                • Lab A Case for Pacific Plate Motion
                                                                                                                                                                                                                • Lab Earthquake Earthquake Wheres the earthquake
                                                                                                                                                                                                                • Science and History Volcano Weather
                                                                                                                                                                                                                  • Chapter 12 Study Guide
                                                                                                                                                                                                                  • Chapter 12 Review
                                                                                                                                                                                                                  • Chapter 12 Standardized Test Practice
                                                                                                                                                                                                                      • Unit 4 Forms of Energy
                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                          • Launch Lab Electric Circuits
                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                          • Section 1 Electric Charge
                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                            • Visualizing Lightning
                                                                                                                                                                                                                            • MiniLAB Investigate Charged Objects
                                                                                                                                                                                                                              • Section 2 Electric Current
                                                                                                                                                                                                                                • MiniLAB Investigating Battery Addition
                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                • Lab Identifying Conductors and Insulators
                                                                                                                                                                                                                                  • Section 3 Electrical Energy
                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                    • Applying Math Power Used by a Clothes Dryer
                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                    • Applying Math Electrical Energy Used by a Microwave Oven
                                                                                                                                                                                                                                    • Lab Design Your Own - Comparing Series and Parallel Circuits
                                                                                                                                                                                                                                    • Science and Language Arts Invisible Man
                                                                                                                                                                                                                                      • Chapter 13 Study Guide
                                                                                                                                                                                                                                      • Chapter 13 Review
                                                                                                                                                                                                                                      • Chapter 13 Standardized Test Practice
                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                          • Launch Lab The Strength of Magnets
                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                          • Section 1 Magnetism
                                                                                                                                                                                                                                            • MiniLAB Observing Magnetic Interference
                                                                                                                                                                                                                                            • Integrate Earth Science
                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                            • Applying Science How can magnetic parts of a junk car be salvaged
                                                                                                                                                                                                                                            • MiniLAB Making Your Own Compass
                                                                                                                                                                                                                                              • Section 2 Electricity and Magnetism
                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                  • Section 3 Producing Electric Current
                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                    • Visualizing Motors and Generators
                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                    • Lab Electricity and Magnetism
                                                                                                                                                                                                                                                    • Lab Design Your Own - Controlling Electromagnets
                                                                                                                                                                                                                                                    • Science and History Body Art
                                                                                                                                                                                                                                                      • Chapter 14 Study Guide
                                                                                                                                                                                                                                                      • Chapter 14 Review
                                                                                                                                                                                                                                                      • Chapter 14 Standardized Test Practice
                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                          • Launch Lab Can electromagnetic waves change materials
                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                          • Section 1 What are electromagnetic waves
                                                                                                                                                                                                                                                            • MiniLAB Investigating Electromagnetic Waves
                                                                                                                                                                                                                                                            • Applying Math The Speed of Light in Water
                                                                                                                                                                                                                                                              • Section 2 The Electromagnetic Spectrum
                                                                                                                                                                                                                                                                • MiniLAB Heating with Microwaves
                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                • Lab The Shape of Satellite Dishes
                                                                                                                                                                                                                                                                  • Section 3 Radio Communication
                                                                                                                                                                                                                                                                    • Visualizing Radio Broadcasts
                                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Lab Use the Internet - Radio Frequencies
                                                                                                                                                                                                                                                                    • Science and History Riding a Beam of Light
                                                                                                                                                                                                                                                                      • Chapter 15 Study Guide
                                                                                                                                                                                                                                                                      • Chapter 15 Review
                                                                                                                                                                                                                                                                      • Chapter 15 Standardized Test Practice
                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                          • Launch Lab Heating with Solar Energy
                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                          • Section 1 Fossil Fuels
                                                                                                                                                                                                                                                                            • Visualizing The Formation of Fossil Fuels
                                                                                                                                                                                                                                                                            • MiniLAB Designing an Efficient Water Heater
                                                                                                                                                                                                                                                                              • Section 2 Nuclear Energy
                                                                                                                                                                                                                                                                                • Integrate Earth Science
                                                                                                                                                                                                                                                                                • Integrate Social Science
                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                • Applying Science Can a contaminated radioactive site be reclaimed
                                                                                                                                                                                                                                                                                  • Section 3 Renewable Energy Sources
                                                                                                                                                                                                                                                                                    • MiniLAB Using Solar Power at Home
                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                    • Lab Solar Heating
                                                                                                                                                                                                                                                                                    • Lab Use the Internet How much does energy really cost
                                                                                                                                                                                                                                                                                    • Science and Society Reacting to Nuclear Energy
                                                                                                                                                                                                                                                                                      • Chapter 16 Study Guide
                                                                                                                                                                                                                                                                                      • Chapter 16 Review
                                                                                                                                                                                                                                                                                      • Chapter 16 Standardized Test Practice
                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                          • Lab Atmospheric Pressure
                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                          • Section 1 Earths Atmosphere
                                                                                                                                                                                                                                                                                            • MiniLAB Visualizing Convection
                                                                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                                                                            • Lab Visualizing a Temperature Inversion
                                                                                                                                                                                                                                                                                              • Section 2 Weather
                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Coriolis Effect
                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                  • Section 3 Climate
                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                    • Visualizing Earths Biogeophysical System
                                                                                                                                                                                                                                                                                                      • Section 4 Earths Changing Climates
                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                        • Applying Math Carbon Dioxide (CO2) Concentration
                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Investigating Microclimate
                                                                                                                                                                                                                                                                                                        • Science and Language Arts The Grapes of Wrath
                                                                                                                                                                                                                                                                                                          • Chapter 17 Study Guide
                                                                                                                                                                                                                                                                                                          • Chapter 17 Review
                                                                                                                                                                                                                                                                                                          • Chapter 17 Standardized Test Practice
                                                                                                                                                                                                                                                                                                              • Unit 5 Matter and Earth Materials
                                                                                                                                                                                                                                                                                                                • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                  • Launch Lab Demonstrate the Distillation of Water
                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                  • Section 1 Composition of Matter
                                                                                                                                                                                                                                                                                                                    • Visualizing Elements
                                                                                                                                                                                                                                                                                                                    • MiniLAB Classifying Materials
                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                    • Lab Comparing Pure Substances and Mixtures
                                                                                                                                                                                                                                                                                                                      • Section 2 Properties of Matter
                                                                                                                                                                                                                                                                                                                        • Integrate Environment
                                                                                                                                                                                                                                                                                                                        • MiniLAB Separating Ink
                                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                                        • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                        • Applying Math The Law of Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Measuring the Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Science Stats Intriguing Elements
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Study Guide
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Review
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                            • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                              • Launch Lab Inferring What You Cant Observe
                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                              • Section 1 Structure of the Atom
                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling an Aluminum Atom
                                                                                                                                                                                                                                                                                                                                • Visualizing The Atomic Model
                                                                                                                                                                                                                                                                                                                                  • Section 2 Masses of Atoms
                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                    • Applying Science How can radioactive isotopes help tell time
                                                                                                                                                                                                                                                                                                                                      • Section 3 The Periodic Table
                                                                                                                                                                                                                                                                                                                                        • MiniLAB Organizing a Personal Periodic Table
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Career
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                                                                                                                                                                        • Lab A Periodic Table of Foods
                                                                                                                                                                                                                                                                                                                                        • Lab Use the Internet Whats in a name
                                                                                                                                                                                                                                                                                                                                        • Science and History A Chilling Story
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Study Guide
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Review
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                            • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                              • Launch Lab Earth Materials at Home and School
                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                              • Section 1 Minerals
                                                                                                                                                                                                                                                                                                                                                • MiniLAB Identifying Salts Crystal System
                                                                                                                                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                • Lab Be a Mineral Detective
                                                                                                                                                                                                                                                                                                                                                  • Section 2 Igneous Rocks
                                                                                                                                                                                                                                                                                                                                                    • Applying Math Extrusive Igneous Rock Classification
                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                      • Section 3 Sedimentary Rocks
                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Evaporites
                                                                                                                                                                                                                                                                                                                                                          • Section 4 Metamorphic Rocks and the Rock Cycle
                                                                                                                                                                                                                                                                                                                                                            • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                            • Visualizing Shock Metamorphic Rock
                                                                                                                                                                                                                                                                                                                                                            • Lab Identifying Rocks
                                                                                                                                                                                                                                                                                                                                                            • Science and Society Earth Materials at Work
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Study Guide
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Review
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                  • Launch Lab Have you got the time
                                                                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                                                                  • Section 1 Weathering and Soil
                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing a Disappearing Seasoning
                                                                                                                                                                                                                                                                                                                                                                    • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                    • Lab Graphing Soil Textures
                                                                                                                                                                                                                                                                                                                                                                      • Section 2 Shaping the Landscape
                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Runoff
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                          • Section 3 Groundwater
                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Porosity Volume
                                                                                                                                                                                                                                                                                                                                                                            • Visualizing The Role of Groundwater in Shaping Earths Surface
                                                                                                                                                                                                                                                                                                                                                                            • Integrate Environment
                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                              • Section 4 Geologic Time
                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                                                                                                • Lab Its about time - relative that is
                                                                                                                                                                                                                                                                                                                                                                                • Science and Society Tapping into the Underground
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Review
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                      • Unit 6 Interactions of Matter
                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                          • Lab Chemical Bonds and Mixing
                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Stability in Bonding
                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                            • Lab Atomic Trading Cards
                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Types of Bonds
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Observing a Bond Type
                                                                                                                                                                                                                                                                                                                                                                                                • Visualizing Polar Molecules
                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Writing Formulas and Naming Compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math Determining a Formula
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Science Can you name binary ionic compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Making a Hydrate
                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Model and Invent - Modeling Chemical Bonding
                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Sticky Subject
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Review
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab RustingmdashA Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Chemical Changes
                                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Designing a Team Equation
                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Chemical Equations
                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math Barium Sulfate Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Classifying Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 4 Reaction Rates and Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing Chemical Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Creating a Colorful Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab To Glow or Not to Glow
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Investigating Reaction Conditions
                                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Clumsy Move Pays Off
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Review
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab Magic Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 How Solutions Form
                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                                                                                                                                                                                                                                                            • Visualizing Metal Alloys
                                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Observing the Effect of Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Solubility and Concentration
                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Acids Bases and Salts
                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing Acid Relief
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Strength of Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Determining Acidity
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Saturated Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and Society Acid Rain
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab The Size of a Nucleus
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Strong Force
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Nuclear Decay
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Detecting Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math The Age of Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Social Studies
                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Nuclear Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling a Nuclear Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Visualizing PET Scans
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Chain Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Model and Invent Modeling Transmutations
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and History The Nuclear Alchemist
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 26 Stars and Galaxies
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab Stars in the Sky
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Observing the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling a Telescope
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math The Magnifying Power of Telescopes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Evolution of Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Counting Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing H-R Diagrams of Star Clusters
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Star Cluster Age
                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 3 Galaxies and the Milky Way
                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 4 Cosmology
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Lab Model and Invent - Expansion of the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Science and Language Arts Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Student Resources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Skill Handbook
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Scientific Methods
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Safety Symbols
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Safety in the Science Laboratory
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 1 The Nature of Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 2 Science Technology and Society
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 3 Motion Acceleration and Forces
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 4 The Laws of Motion
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 5 Energy
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 6 Work and Machines
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 8 The Solar System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 9 Heat and States of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 10 Waves
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 11 Sound and Light
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 25 Nuclear Changes
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Page 23: 706 S1 318-326 GPS09 - Light-and-Sound - home · PDF fileWhat sound does a ruler make? ... sound waves cannot travel in empty space where there are no particles. ... sound travels

340 CHAPTER 11 Sound and Light

Looking Through Colored Filters Figure 25 shows howthe color of an object can change when you look at it throughvarious colored filters The cooler looks blue under white lightbecause it reflects only the wavelengths of blue light that strikeit If you look at the cooler through a blue filter the cooler stilllooks blue because the blue filter transmits the reflected bluelight However if you look at the cooler through a red filter thecooler seems black because the red filter blocks the blue lightreflected by the cooler

Why does a blue object appear black whenviewed through a red filter

Seeing ColorAs you approach a busy intersection the color of the traffic

light changes from green to yellow to red On the cross street thecolor changes from red to green At a busy intersection trafficsafety depends on your ability to detect color changes rapidlyHow do you see colors

Light and the Eye In a healthy eye light enters the eyethrough the cornea is focused by the lens and finally forms animage on the retina The retina is made up of two types of cellsthat absorb light as shown in Figure 26 When these cellsabsorb light energy chemical reactions convert light energy intonerve impulses that are transmitted to the brain One type ofcell in the retina called a cone enables you to distinguish colorsand detailed shapes of objects Cones need bright light to gener-ate nerve impulses so they do not operate in dim light As aresult even brightly colored objects might look gray or black indim light

Figure 25 The color of this

cooler changes when viewed

through different color filters

Topic Color BlindnessVisit for Web

links to information about the

causes of color blindness

Activity Research the causes

and types of color blindness Find

out how cones are related to the

ability to distinguish colors

gpesciencecom

GPS+_340

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SECTION 4 Light and Color 341

Cones and Rods Your eyes have three types of cones each ofwhich responds to a different range of wavelengths Red conesrespond to mostly red and yellow light Green cones respond tomostly yellow and green light Blue cones respond to mostlyblue and violet light The second type of cell in the retina calleda rod is sensitive to dim light and enables you to see at nightHowever rod cells do not enable you to see colors

Interpreting Color Why does a bananalook yellow The light reflected by the

banana causes the cone cells that are sensitive to red and greenlight to send signals to your brain Your brain could get the samesignal if a mixture of red light and green light reached your eyesThis mixture also would cause your red and green cones torespond and you would see the color yellow As a result lightwith wavelengths corresponding to yellow light and light that isa mixture of red and green light both cause the color yellow tobe seen What happens when you look at a white shirt You seewhite when all wavelengths of visible light enters your eyes Thenall three sets of cones cells send signals to the brain The com-bination of these signals cause you to see the shirt as white

Color Blindness If one or more of your sets of cone cellsdo not function properly you might not be able to distinguishcertain colors This condition is called color blindness orcolor deficiency About eight percent of men and one-halfpercent of women have some form of color blindness Themost common form of color blindness makes it difficult todistinguish between red and green Figure 27 shows an imagethat is used in a test for redndashgreen color blindness Becausered and green are used in traffic signals drivers and pedestri-ans must be able to identify them

Retina

Rod

Cone

Lens

Figure 27 Color blindness is an

inherited sex-linked condition in

which certain sets of cones in the

retina do not function properly

Identify the number that you seein the dots

Figure 26 Light enters the eye

and focuses on the retina The two

types of light-detecting cells

that make up the retina

are called rods and cones

GPS+_341

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1070482

eng - iTunNORM 00000340 00000000 00002026 00000000 000155F0 00000000 0000607C 00000000 0000097D 00000000

342 CHAPTER 11 Sound and Light

Mixing ColorsIf you have ever browsed through a paint store you have

probably seen displays where customers can select paint samplesof almost every imaginable color The colors are a result of mix-tures of pigments For example you might have mixed blue andyellow paint to produce green paint A pigment is a coloredmaterial that is used to change the color of other substancesThe color of a pigment results from the different wavelengths oflight that the pigment reflects

Mixing Colored Lights From the glowing orange of a sun-set to the deep blue of a mountain lake all the colors you see canbe made by mixing three colors of light These three colorsmdashred green and bluemdashare the primary colors of light They cor-respond to the three different types of cones in the retina ofyour eye When mixed together in equal amounts they producewhite light as Figure 28 shows Mixing the primary colors indifferent proportions can produce the colors you see

What are the primary colors of light

Paint Pigments If you were to mix equal amounts of redgreen and blue paint would you get white paint If mixing col-ors of paint were like mixing colors of light you would but mix-ing paint is different Paints are made with pigments Pigmentsproduce color as a result of the wavelengths of light they reflectPaint pigments usually are made of chemical compounds suchas titanium oxide a bright white pigment and lead chromatewhich is used for painting yellow lines on highways

Figure 28 White light is pro-

duced when the three primary col-

ors of light are mixed in equal

amounts

Color for PhotosynthesisPlant pigments determinethe wavelengths oflight for photosynthesisLeaves usually look greenbecause of the pigmentchlorophyll Chlorophyllabsorbs most wave-lengths of visible lightexcept green which itreflects However not allplants are green Researchdifferent plant pigmentsto find out how they allowplant species to survive indiverse habitats

GPS+_342

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SECTION 4 Light and Color 343

Self Check

1 Identity what colors are reflected and what colors are

absorbed if a white light shines on a red shirt

2 Discuss how the primary colors of light differ from the

primary pigment colors

3 Explain why a red apple would appear black if you

looked at it through a blue filter

4 Determine why a white fence appears to be white instead

of multicolored if all colors are present in white light

5 Think Critically Light reflected from an object passes

through a green filter then a red filter and finally a

blue filter What color will the object seem to be

Summary

Why Objects Have Color

bull The color of an object is determined by the

wavelengths of light it reflects

bull The color of a filter is the color of the light the

filter transmits

Seeing Color

bull Rod and cone cells are light-sensitive cells

found in the retina of the human eye

bull Rod cells are sensitive to dim light Cone cells

enable colors to be seen

bull There are three types of cone cells One type

responds to red light another to green light

and another to blue light

Mixing Colors

bull Red green and blue are the primary light

colors Any color of light can be created by

mixing these primary light colors

bull Any pigment color can be formed by mixing

the primary pigment colorsmdashmagenta cyan

and yellow

6 Use Percentages In the human eye there are about

120000000 rods If 90000000 rods trigger at once

what percentage of the total number of rods triggered

7 Convert Units The wavelengths of light are measured

in nanometers (nm) which equals 0000001 mm

Find the wavelength in mm of a light wave that has a

wavelength of 690 nm

Mixing Pigments You can make any pigment color by mixingdifferent amounts of the three primary pigmentsmdashmagenta(bluish red) cyan (greenish blue) and yellow In fact color print-ers use these pigments as well as black ink to make full-colorprints like the pages in this book A primary pigmentrsquos colordepends on the wavelengths of the light that it reflects Actuallypigments both absorb and reflect a range of colors in sending asingle color message to your eye For example in white lightyellow pigment appears yellow because it reflects red and greenlight but absorbs the other wavelengths of visible light The colorof a mixture of two primary pigments is determined by theprimary colors of light that both pigments reflect

Look at Figure 29 The area in the center where the colors alloverlap appears to be black because the three blended primarypigments absorb all the primary colors of light Recall that theprimary colors of light combine to produce white light They arecalled additive colors However when the primary pigment col-ors are combined they absorb all wavelengths of visible light andproduce black Because black results from the absence ofreflected light the primary pigments are called subtractive colors

Figure 29 The three primary

pigment colors appear to be black

when they are mixed

Describe how the primary pigmentcolors are similar to the primary col-ors of light

More Section Review gpesciencecom

GPS+_343

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7230715

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Design Your OwnDesign Your Own

344

Real-World ProblemWhat loud noises do you enjoy and which ones do you find annoying

Most people enjoy a music concert performed by their favorite artist or

the booming displays of fireworks on the Fourth of July Most people

enjoy these loud sounds for short periods of time However certain

other loud noises such as traffic sirens and loud talking can be

annoying Constant annoying noises are called noise pollution What

can be done to reduce noise pollution What types of barriers will best

block out noise pollution

Form a HypothesisBased on your experiences with loud noises form a hypothesis that

predicts the effectiveness of different types of barriers at blocking out

noise pollution

Test Your HypothesisMake a Plan

1 Complete the safety form

2 Decide what type of barriers or materials you will test

3 Describe exactly how you will use these materials

Goals Design an experiment

that tests the effective-

ness of various types of

barriers and materials

for blocking out noise

pollution

Test different types of

materials and barriers

to determine the best

noise blocks

Possible Materialsradio CD player horn

drum or other loud

noise source

shrubs trees concrete

walls brick walls stone

walls wooden fences

parked cars or hanging

laundry

sound meter

meterstick or metric tape

measure

Blocking NfisePollution

4 Identify the controls and variables you will use in your

experiment

5 List the steps you will use and describe each step precisely

6 Prepare a data table in your Science Journal to record your

measurements

7 Organize the steps of your experiment in logical order

Follow Your Plan

1 Ask your teacher to approve your plan and data table before

you start

2 Conduct your experiment as planned

3 Test each barrier two or three times

4 Record the results from each test in your data table in your Science Journal

Analyze Your Data1 Identify the barriers that most effectively reduced noise pollution

2 Identify the barriers that least effectively reduced noise pollution

3 Compare the effective barriers and identify common characteristics that might

explain why they reduced noise pollution

4 Compare the natural barriers you tested with the artificial barriers Which type

of barrier best reduced noise pollution

5 Compare the different types of materials the barriers were made of Which

type of material best reduced noise pollution

Conclude and Apply1 Evaluate whether your results support your hypothesis

2 Predict how your results would differ if you used a louder source of noise such

as a siren

3 Infer from your results how people living near a

busy street could reduce noise pollution

4 Identify major sources of noise pollution in or

near your home How could they be reduced

5 Research how noise pollution can be

unhealthy

LAB 345

Draw a poster illustrating how builders and

landscapers could use certain materials to

better insulate a home or office from excess

noise pollution

346 CHAPTER 11 Sound and Light

A Haiku GardenThe Four Seasons in Poems and Prints

by Stephen Addiss with Fumiko and Akira Yamamoto

Respond to the Reading1 How do the illustrations help the reader

better understand the poems2 What do you think is meant by the

word lingering in the Haiku about springsunlight

3 Linking Science and Writing Writeone haiku about summer and anotherabout fall In one poem use color tohelp you describe the season In theother use light or some property oflight to help describe the season

Research has deter-mined that there is a

connection between color and mood Warmcolors have longer wavelengths and can bemore stimulating Cool colors which haveshorter wavelengths tend to have a calmingor soothing effect on people Light and colorhave long been used as literary symbols Doesthe use of color change what you imaginewhen you read the haiku

UnderstandingLiteratureJapanese Haiku A haiku is a verse thatconsists of three lines and 17 syllables inthe Japanese language The first and thirdlines have five syllables each and themiddle line has seven syllables Why isimagination important in reading haiku

Lingering

in every pool of watermdash

spring sunlightIssa

Withered by winter

the sound of the windmdash

one-color worldBasho

Sound

1 Sound waves are compressional waves thattravel only in matter

2 The speed of sound in a material dependson the type of material as well as itstemperature

3 Loudness depends on a sound waversquos inten-sity Pitch depends on a sound waversquosfrequency

4 Sound waves are used in echolocationsonar and medical imaging

Reflection and Refractionof Light

1 Light can be absorbed reflected or trans-mitted by a material

2 When light waves are reflected theyobey the law of reflectionmdashthe angle ofincidence equals the angle of reflection

3 A light wave is refracted or bent whenit changes speed as it travels at an anglefrom one material to another

Mirrors Lenses andthe Eye

1 Plane mirrors form upright virtual images

2 Images formed by concave mirrors andconvex lenses depend on the location ofthe object relative to the focal point

3 Convex mirrors and concave lenses formvirtual upright images that are smallerthan the object

4 The lens in the human eye changes shape toproduce a sharp image on the retina

Light and Color

1 You see color when light is reflected offobjects and into your eyes

2 Cone cells in the retina are light-sensitivecells that enable you to distinguish colors

3 Red blue and green are the three primarycolors of light and can be mixed to form allother colors

4 The primary pigment colors are magentacyan and yellow

CHAPTER STUDY GUIDE 347

Use the Foldable you made at the beginningof the chapter to help you review sound and light

Interactive Tutor gpesciencecom

Complete each statement with the correctvocabulary word or phrase

1 A change in frequency due to a movingsound source is due to the

2 A flat smooth surface that reflects light andforms an image is a(n)

3 An object is if you can seethrough it clearly

4 The of a material indicates howmuch the speed of light in the materialchanges as light passes through

5 You can change the color of white paint byadding a(n) to it

6 A(n) is a reflecting surface thatcurves outward like the back of a spoon

7 The human perception of the intensity of asound wave is

Choose the word or phrase that best answerseach question

8 Which of the following best describes imageformation by a plane mirrorA) A real image is formed in front of the mirrorB) A real image is formed behind the mirrorC) A virtual image is formed in front of the

mirrorD) A virtual image is formed behind the mirror

9 For a sound with low pitch what else isalso always lowA) amplitude C) wavelengthB) frequency D) wave velocity

10 Which of the following occurs when asound source moves away from youA) The soundrsquos velocity decreasesB) The soundrsquos loudness increasesC) The soundrsquos frequency decreasesD) The soundrsquos frequency increases

Use the table below to answer question 11

11 Based on the data in the table abovewhich of the following would be the speedof sound in air at 30degCA) 3404 ms C) 3494 msB) 3464 ms D) 3534 ms

12 What happens to a light ray travelingparallel to the optical axis of a convexlens that passes through the lensA) It travels parallel to the optical axisB) It passes through the focal pointC) It is bent away from the optical axisD) It forms a virtual image

13 Light waves of which color are bent mostwhen passing through a prismA) blue C) violetB) red D) yellow

14 Which way does a concave lens bend lightA) toward its optical axisB) toward its centerC) toward its edgesD) toward its focal point

Speed of Sound in Air

Temp peed( s)

4

4

4

348 CHAPTER REVIEW

concave lens p 335concave mirror p 332convex lens p 333convex mirror p 333decibel p 322Doppler effect p 323index of refraction p 329intensity p 322

loudness p 322opaque p 327pigment p 342pitch p 323plane mirror p 331translucent p 327transparent p 327

Vocabulary PuzzleMaker gpesciencecom

Use the illustration below to answer question 15

15 Describe how the position of the candlechanged if the image of the candle movedaway from the focal point

16 Apply Acoustic scientists sometimes doresearch in rooms that absorb all soundwaves How could such a room be used tostudy how bats find their food

17 Compare White light passes through atranslucent pane of glass and shines on ashirt Both the translucent glass and theshirt appear green Compare the colors oflight that are absorbed and transmitted bythe glass and the shirt

18 Infer Most mammals including dogs andcats canrsquot see colors Infer how the retinaof a catrsquos eye might be different from theretina of a human eye

19 Determine whether a convex lens could forman image that is enlarged real and upright

20 Infer A car comes to a railroad crossingThe driver hears a trainrsquos whistle and itspitch becomes lower What can beassumed about how the train is moving

21 Compare and contrast the reflection of lightfrom a white wall with a rough surfacewith the reflection of light from a mirror

Optical axis

One

focal

length

Two

focal

lengths

Image

Ray A

Object

Focal

point

Interpreting Graphics 22 Infer why a convex mirror and a concavelens can never produce a real image

23 Predict what color a white shirt wouldappear to be if the light reflected from theshirt passed through a red filter and thenthrough a green filter

24 Explain why windows might begin to rattlewhen an airplane flies overhead

25 Communicate Some people enjoy usingsnowmobiles Others object to the noisethat they make Write a proposal for a pol-icy that seems fair to both groups for theuse of snowmobiles in a state park

CHAPTER REVIEW 349

Use the wave speed equation ν ƒλ to answer

questions 26 and 27

26 Calculate Frequency A sonar pulse has awavelength of 30 cm and a speed inwater of 1500 ms Find its frequency

27 Calculate Wavelength What is the wave-length of a sound wave with a fre-quency of 440 Hz if the speed of soundin air is 340 ms

28 Calculate Angle of Incidence A light ray isreflected from a mirror If the anglebetween the incident ray and thereflected ray is 136deg what is the angleof incidence

29 Determine Object Distance You hold anobject in front of a concave mirror witha focal length of 30 cm If you do notsee a reflected image how far from themirror is the object

30 Calculate Speed The speed of light in avacuum is 300000 kms If the index ofrefraction of water is 133 what is thespeed of light in water

More Chapter Review gpesciencecom

1 Which of the following describes the imageformed by a convex mirror

A enlarged

B inverted

C real

D virtual

Use the figure below to answer question 2

2 Which of the following describes a light raythat passes through the focal point andthen is reflected by the mirror

A It travels parallel to the optical axis

B It forms a real image

C It is reflected back through the focal point

D It forms a virtual image

3 Why does an apple look red

A It reflects red light

B It absorbs red light

C It reflects green and blue light

D It reflects all colors of light except red

Use the figure below to answer questions 4 and 5

4 When the primary colors of light are addedtogether what color appears in area H

A cyan

B magenta

C white

D yellow

5 When the primary colors of light are addedtogether what color appears in area G

A cyan

B magenta

C white

D yellow

6 Which of the following increases as the fre-quency of a sound increases

A amplitude

B intensity

C loudness

D pitch

Red Blue

Green

F

H

G K

Focal pointOptical axis

350 STANDARDIZED TEST PRACTICE

Record your answers on the answer sheet provided by your teacher or on a sheet of paper

STANDARDIZED TEST PRACTICE 351

7 Which of the following parts of the eyeenable you to see colors in bright light

A cone cells

B cornea

C lens

D rod cells

Use the graph below to answer questions 8 and 9

8 Determine how far in centimeters theimage is from the lens when the object is15 centimeters from the lens

9 How far in centimeters is the object fromthe lens when the image distance andobject distance are equal

10 A shirt has stripes that are black and whitein white light If green light shines on thisshirt what colors will the black and whitestripes be

11 If you are on a moving train what hap-pens to the pitch of a crossing bell as youapproach the crossing and then moveaway from the crossing

Use the figure below to answer question 12

12 Describe the vision problem show by thefigure and explain how this vision prob-lem can be corrected

13 Explain why the human eye can see colorsbetter in bright light than in dim light

Image Distance fora Convex Lens

Ima

ge

dis

tan

ce (

cm)

30

25

20

15

10

5 10 15 20 25 30

Object distance (cm)

Standardized Test Practice gpesciencecom

Note Units Read carefully and make note of the units used in

any measurement

  • Glencoe Physical Science with Earth Science
    • Student Edition Table of Contents
      • Unit 1 Science and Technology
        • Chapter 1 The Nature of Science
          • Launch Lab Understanding Measurements
          • Foldables
          • Section 1 The Methods of Science
            • Science Online
            • Integrate History
            • Integrate Earth Science
            • Science Online
              • Section 2 Standards of Measurement
                • Applying Math Centimeters
                • Integrate Earth Science
                • Science Online
                • MiniLAB Determining the Density of a Pencil
                • Visualizing SI Dimensions
                  • Section 3 Communicating with Graphs
                    • Applying Math Temperature
                    • MiniLAB Graphing Temperature Change
                    • Lab Whats my graph
                    • Lab Design Your Own - Developing a Measurement System
                    • Science and Language Arts Thinking in Pictures and Other Reports from My Life with Autism
                      • Chapter 1 Study Guide
                      • Chapter 1 Review
                      • Chapter 1 Standardized Test Practice
                        • Chapter 2 Science Technology and Society
                          • Lab Technology in Your Life
                          • Foldables
                          • Section 1 Science and Technology
                            • MiniLAB Researching the Past
                            • Visualizing Technology Supplying Basic Needs
                            • Science Online
                              • Section 2 Forces that Shape Technology
                                • MiniLAB Evaluating the Benefits and Consequences of Technology
                                • Integrate Environment
                                • Integrate History
                                • Applying Science What impact does the accident at Chernobyl have on the future of nuclear power
                                • Science Online
                                • Lab Who contributes CO2
                                  • Section 3 Developing Technology
                                    • Integrate Life Science
                                    • Integrate Career
                                    • Lab Model and Invent - Care Package
                                    • Oops Accidents in Science A Slippery Situation
                                      • Chapter 2 Study Guide
                                      • Chapter 2 Review
                                      • Chapter 2 Standardized Test Practice
                                          • Unit 2 Motion Forces and Energy
                                            • Chapter 3 Motion Acceleration and Forces
                                              • Launch Lab Compare Speeds
                                              • Foldables
                                              • Section 1 Describing Motion
                                                • MiniLAB Measuring Average Speed
                                                • Science Online
                                                • Applying Math Average Speed
                                                • Integrate Astronomy
                                                • Science Online
                                                  • Section 2 Acceleration
                                                    • Integrate History
                                                    • Visualizing Acceleration
                                                      • Section 3 Motion and Forces
                                                        • Science Online
                                                        • MiniLAB Comparing Friction
                                                        • Lab Force and Acceleration
                                                        • Lab Design Your Own - Comparing Motion from Different Forces
                                                        • Science and Language Arts A Brave and Startling Truth
                                                          • Chapter 3 Study Guide
                                                          • Chapter 3 Review
                                                          • Chapter 3 Standardized Test Practice
                                                            • Chapter 4 The Laws of Motion
                                                              • Launch Lab The Force of Gravity
                                                              • Foldables
                                                              • Section 1 The First Two Laws of Motion
                                                                • MiniLAB Observing Inertia
                                                                • Science Online
                                                                • Applying Math The Acceleration of a Sled Solve a Simple Equation
                                                                  • Section 2 Gravity
                                                                    • Science Online
                                                                    • Integrate Earth Science
                                                                    • MiniLAB Observing Centripetal Force
                                                                    • Lab Gravity and Air Resistance
                                                                      • Section 3 The Third Law of Motion
                                                                        • Integrate Career
                                                                        • Visualizing Rocket Motion
                                                                        • Applying Math The Momentum of a Sprinter
                                                                        • Lab The Momentum of Colliding Objects
                                                                        • Science and History Newton and the Plague
                                                                          • Chapter 4 Study Guide
                                                                          • Chapter 4 Review
                                                                          • Chapter 4 Standardized Test Practice
                                                                            • Chapter 5 Energy
                                                                              • Launch Lab Energy Conversions
                                                                              • Foldables
                                                                              • Section 1 The Nature of Energy
                                                                                • Science Online
                                                                                • Applying Math Kinetic Energy
                                                                                • MiniLAB Interpreting Data from a Slingshot
                                                                                • Integrate Language Arts
                                                                                • Applying Math Gravitational Potential Energy
                                                                                • Lab Bouncing Balls
                                                                                  • Section 2 Conservation of Energy
                                                                                    • Visualizing Energy Transformations
                                                                                    • Integrate Environment
                                                                                    • MiniLAB Transforming Energy in a Paper Clip
                                                                                    • Science Online
                                                                                    • Integrate Health
                                                                                    • Lab Design Your Own - Swinging Energy
                                                                                    • Science and History The Impossible Dream
                                                                                      • Chapter 5 Study Guide
                                                                                      • Chapter 5 Review
                                                                                      • Chapter 5 Standardized Test Practice
                                                                                        • Chapter 6 Work and Machines
                                                                                          • Launch Lab Doing Work with a Simple Machine
                                                                                          • Foldables
                                                                                          • Section 1 Work
                                                                                            • Integrate Language Arts
                                                                                            • Applying Math Work
                                                                                            • MiniLAB Calculating Your Work and Power
                                                                                            • Applying Math Power
                                                                                              • Section 2 Using Machines
                                                                                                • MiniLAB Machines Multiplying Force
                                                                                                • Science Online
                                                                                                • Integrate Chemistry
                                                                                                  • Section 3 Simple Machines
                                                                                                    • Integrate History
                                                                                                    • Visualizing Levers in the Human Body
                                                                                                    • Science Online
                                                                                                    • Lab Levers
                                                                                                    • Lab Model and Invent - Using Simple Machines
                                                                                                    • Science and Society The Science of Very Very Small
                                                                                                      • Chapter 6 Study Guide
                                                                                                      • Chapter 6 Review
                                                                                                      • Chapter 6 Standardized Test Practice
                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                          • Launch Lab Relative Sizes of Earth the Moon and the Sun
                                                                                                          • Foldables
                                                                                                          • Section 1 Earth in Space
                                                                                                            • Science Online
                                                                                                            • Integrate Physics
                                                                                                              • Section 2 Time and Seasons
                                                                                                                • MiniLAB Modeling the Suns Rays at Solstice
                                                                                                                • Lab Comparing the Angle of Sunlight to Intensity
                                                                                                                  • Section 3 Earths Moon
                                                                                                                    • Applying Math Tides
                                                                                                                    • MiniLAB Modeling Phases and Eclipses
                                                                                                                    • Integrate History
                                                                                                                    • Integrate History
                                                                                                                    • Science Online
                                                                                                                    • Visualizing Water on the Moon
                                                                                                                    • Lab Identifying the Moons Surface Features and Apollo Landing Sites
                                                                                                                    • Oops Accidents in Science Even Great Scientists Make Mistakes
                                                                                                                      • Chapter 7 Study Guide
                                                                                                                      • Chapter 7 Review
                                                                                                                      • Chapter 7 Standardized Test Practice
                                                                                                                        • Chapter 8 The Solar System
                                                                                                                          • Launch Lab The Size of the Solar System
                                                                                                                          • Foldables
                                                                                                                          • Section 1 Planet Motion
                                                                                                                            • Integrate History
                                                                                                                            • MiniLAB Plotting Retrograde Motion
                                                                                                                            • Integrate Physics
                                                                                                                            • Applying Math Heliocentric Longitude (HL)
                                                                                                                              • Section 2 The Inner Planets
                                                                                                                                • Science Online
                                                                                                                                • Integrate Chemistry
                                                                                                                                • Lab Interpreting Features of Marss Surface
                                                                                                                                  • Section 3 The Outer Planets
                                                                                                                                    • Integrate Language Arts
                                                                                                                                    • Visualizing What Galileo Saw
                                                                                                                                    • Science Online
                                                                                                                                    • MiniLAB Comparing Sizes of Outer and Inner Planets
                                                                                                                                      • Section 4 Life in the Solar System
                                                                                                                                        • Lab Design Your Own - Testing Unknown Soil Samples for Life
                                                                                                                                        • Science Stats Night Sky Wonders
                                                                                                                                          • Chapter 8 Study Guide
                                                                                                                                          • Chapter 8 Review
                                                                                                                                          • Chapter 8 Standardized Test Practice
                                                                                                                                              • Unit 3 Energy in Motion
                                                                                                                                                • Chapter 9 Heat and States of Matter
                                                                                                                                                  • Launch Lab Expansion of a Gas
                                                                                                                                                  • Foldables
                                                                                                                                                  • Section 1 Temperature and Thermal Energy
                                                                                                                                                    • Applying Math Converting to Celsius
                                                                                                                                                    • Science Online
                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                    • Applying Math Change in Thermal Energy
                                                                                                                                                      • Section 2 States of Matter
                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                        • Science Online
                                                                                                                                                        • MiniLAB Comparing States of Water
                                                                                                                                                          • Section 3 Transferring Thermal Energy
                                                                                                                                                            • MiniLAB Comparing Thermal Conductors
                                                                                                                                                            • Visualizing Convection Currents
                                                                                                                                                            • Lab Convection in Gases and Liquids
                                                                                                                                                              • Section 4 Using Thermal Energy
                                                                                                                                                                • Integrate History
                                                                                                                                                                • Science Online
                                                                                                                                                                • Lab Conduction in Gases
                                                                                                                                                                • Science Stats Surprising Thermal Energy
                                                                                                                                                                  • Chapter 9 Study Guide
                                                                                                                                                                  • Chapter 9 Review
                                                                                                                                                                  • Chapter 9 Standardized Test Practice
                                                                                                                                                                    • Chapter 10 Waves
                                                                                                                                                                      • Launch Lab How do waves transfer energy
                                                                                                                                                                      • Foldables
                                                                                                                                                                      • Section 1 The Nature of Waves
                                                                                                                                                                        • Visualizing Formation of Ocean Waves
                                                                                                                                                                        • Science Online
                                                                                                                                                                          • Section 2 Wave Properties
                                                                                                                                                                            • MiniLAB Observing Wavelength
                                                                                                                                                                            • Integrate Social Studies
                                                                                                                                                                            • Applying Math The Speed of Sound
                                                                                                                                                                            • Lab Wave Speed and Tension
                                                                                                                                                                              • Section 3 The Behavior of Waves
                                                                                                                                                                                • Science Online
                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                • MiniLAB Experimenting with Resonance
                                                                                                                                                                                • Lab Measuring Wave Properties
                                                                                                                                                                                • Science and History Making Waves
                                                                                                                                                                                  • Chapter 10 Study Guide
                                                                                                                                                                                  • Chapter 10 Review
                                                                                                                                                                                  • Chapter 10 Standardized Test Practice
                                                                                                                                                                                    • Chapter 11 Sound and Light
                                                                                                                                                                                      • Launch Lab What sound does a ruler make
                                                                                                                                                                                      • Foldables
                                                                                                                                                                                      • Section 1 Sound
                                                                                                                                                                                        • MiniLAB Comparing Intensity
                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                        • Science Online
                                                                                                                                                                                        • Applying Math Using Sonar
                                                                                                                                                                                          • Section 2 Reflection and Refraction of Light
                                                                                                                                                                                          • Section 3 Mirrors Lenses and the Eye
                                                                                                                                                                                            • Visualizing Images Formed by a Convex Lens
                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                            • MiniLAB Experimenting with Focal Lengths
                                                                                                                                                                                            • Lab Reflections of Reflections
                                                                                                                                                                                              • Section 4 Light and Color
                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Lab Design Your Own - Blocking Noise Pollution
                                                                                                                                                                                                • Science and Language Arts A Haiku Garden The Four Seasons in Poems and Print
                                                                                                                                                                                                  • Chapter 11 Study Guide
                                                                                                                                                                                                  • Chapter 11 Review
                                                                                                                                                                                                  • Chapter 11 Standardized Test Practice
                                                                                                                                                                                                    • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                      • Launch Lab Global Jigsaw Puzzle
                                                                                                                                                                                                      • Foldables
                                                                                                                                                                                                      • Section 1 Evolution of Earths Crust
                                                                                                                                                                                                        • Applying Math Spreading Distances
                                                                                                                                                                                                        • Integrate Physics
                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                          • Section 2 Earthquakes
                                                                                                                                                                                                            • MiniLAB Demonstrating Four Types of Stress
                                                                                                                                                                                                            • Visualizing Earthquake-Proof Buildings
                                                                                                                                                                                                              • Section 3 Earths Interior
                                                                                                                                                                                                              • Section 4 Volcanoes
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • MiniLAB Modeling Lava Viscosity
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                • Lab A Case for Pacific Plate Motion
                                                                                                                                                                                                                • Lab Earthquake Earthquake Wheres the earthquake
                                                                                                                                                                                                                • Science and History Volcano Weather
                                                                                                                                                                                                                  • Chapter 12 Study Guide
                                                                                                                                                                                                                  • Chapter 12 Review
                                                                                                                                                                                                                  • Chapter 12 Standardized Test Practice
                                                                                                                                                                                                                      • Unit 4 Forms of Energy
                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                          • Launch Lab Electric Circuits
                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                          • Section 1 Electric Charge
                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                            • Visualizing Lightning
                                                                                                                                                                                                                            • MiniLAB Investigate Charged Objects
                                                                                                                                                                                                                              • Section 2 Electric Current
                                                                                                                                                                                                                                • MiniLAB Investigating Battery Addition
                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                • Lab Identifying Conductors and Insulators
                                                                                                                                                                                                                                  • Section 3 Electrical Energy
                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                    • Applying Math Power Used by a Clothes Dryer
                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                    • Applying Math Electrical Energy Used by a Microwave Oven
                                                                                                                                                                                                                                    • Lab Design Your Own - Comparing Series and Parallel Circuits
                                                                                                                                                                                                                                    • Science and Language Arts Invisible Man
                                                                                                                                                                                                                                      • Chapter 13 Study Guide
                                                                                                                                                                                                                                      • Chapter 13 Review
                                                                                                                                                                                                                                      • Chapter 13 Standardized Test Practice
                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                          • Launch Lab The Strength of Magnets
                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                          • Section 1 Magnetism
                                                                                                                                                                                                                                            • MiniLAB Observing Magnetic Interference
                                                                                                                                                                                                                                            • Integrate Earth Science
                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                            • Applying Science How can magnetic parts of a junk car be salvaged
                                                                                                                                                                                                                                            • MiniLAB Making Your Own Compass
                                                                                                                                                                                                                                              • Section 2 Electricity and Magnetism
                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                  • Section 3 Producing Electric Current
                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                    • Visualizing Motors and Generators
                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                    • Lab Electricity and Magnetism
                                                                                                                                                                                                                                                    • Lab Design Your Own - Controlling Electromagnets
                                                                                                                                                                                                                                                    • Science and History Body Art
                                                                                                                                                                                                                                                      • Chapter 14 Study Guide
                                                                                                                                                                                                                                                      • Chapter 14 Review
                                                                                                                                                                                                                                                      • Chapter 14 Standardized Test Practice
                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                          • Launch Lab Can electromagnetic waves change materials
                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                          • Section 1 What are electromagnetic waves
                                                                                                                                                                                                                                                            • MiniLAB Investigating Electromagnetic Waves
                                                                                                                                                                                                                                                            • Applying Math The Speed of Light in Water
                                                                                                                                                                                                                                                              • Section 2 The Electromagnetic Spectrum
                                                                                                                                                                                                                                                                • MiniLAB Heating with Microwaves
                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                • Lab The Shape of Satellite Dishes
                                                                                                                                                                                                                                                                  • Section 3 Radio Communication
                                                                                                                                                                                                                                                                    • Visualizing Radio Broadcasts
                                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Lab Use the Internet - Radio Frequencies
                                                                                                                                                                                                                                                                    • Science and History Riding a Beam of Light
                                                                                                                                                                                                                                                                      • Chapter 15 Study Guide
                                                                                                                                                                                                                                                                      • Chapter 15 Review
                                                                                                                                                                                                                                                                      • Chapter 15 Standardized Test Practice
                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                          • Launch Lab Heating with Solar Energy
                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                          • Section 1 Fossil Fuels
                                                                                                                                                                                                                                                                            • Visualizing The Formation of Fossil Fuels
                                                                                                                                                                                                                                                                            • MiniLAB Designing an Efficient Water Heater
                                                                                                                                                                                                                                                                              • Section 2 Nuclear Energy
                                                                                                                                                                                                                                                                                • Integrate Earth Science
                                                                                                                                                                                                                                                                                • Integrate Social Science
                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                • Applying Science Can a contaminated radioactive site be reclaimed
                                                                                                                                                                                                                                                                                  • Section 3 Renewable Energy Sources
                                                                                                                                                                                                                                                                                    • MiniLAB Using Solar Power at Home
                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                    • Lab Solar Heating
                                                                                                                                                                                                                                                                                    • Lab Use the Internet How much does energy really cost
                                                                                                                                                                                                                                                                                    • Science and Society Reacting to Nuclear Energy
                                                                                                                                                                                                                                                                                      • Chapter 16 Study Guide
                                                                                                                                                                                                                                                                                      • Chapter 16 Review
                                                                                                                                                                                                                                                                                      • Chapter 16 Standardized Test Practice
                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                          • Lab Atmospheric Pressure
                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                          • Section 1 Earths Atmosphere
                                                                                                                                                                                                                                                                                            • MiniLAB Visualizing Convection
                                                                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                                                                            • Lab Visualizing a Temperature Inversion
                                                                                                                                                                                                                                                                                              • Section 2 Weather
                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Coriolis Effect
                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                  • Section 3 Climate
                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                    • Visualizing Earths Biogeophysical System
                                                                                                                                                                                                                                                                                                      • Section 4 Earths Changing Climates
                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                        • Applying Math Carbon Dioxide (CO2) Concentration
                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Investigating Microclimate
                                                                                                                                                                                                                                                                                                        • Science and Language Arts The Grapes of Wrath
                                                                                                                                                                                                                                                                                                          • Chapter 17 Study Guide
                                                                                                                                                                                                                                                                                                          • Chapter 17 Review
                                                                                                                                                                                                                                                                                                          • Chapter 17 Standardized Test Practice
                                                                                                                                                                                                                                                                                                              • Unit 5 Matter and Earth Materials
                                                                                                                                                                                                                                                                                                                • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                  • Launch Lab Demonstrate the Distillation of Water
                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                  • Section 1 Composition of Matter
                                                                                                                                                                                                                                                                                                                    • Visualizing Elements
                                                                                                                                                                                                                                                                                                                    • MiniLAB Classifying Materials
                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                    • Lab Comparing Pure Substances and Mixtures
                                                                                                                                                                                                                                                                                                                      • Section 2 Properties of Matter
                                                                                                                                                                                                                                                                                                                        • Integrate Environment
                                                                                                                                                                                                                                                                                                                        • MiniLAB Separating Ink
                                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                                        • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                        • Applying Math The Law of Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Measuring the Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Science Stats Intriguing Elements
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Study Guide
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Review
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                            • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                              • Launch Lab Inferring What You Cant Observe
                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                              • Section 1 Structure of the Atom
                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling an Aluminum Atom
                                                                                                                                                                                                                                                                                                                                • Visualizing The Atomic Model
                                                                                                                                                                                                                                                                                                                                  • Section 2 Masses of Atoms
                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                    • Applying Science How can radioactive isotopes help tell time
                                                                                                                                                                                                                                                                                                                                      • Section 3 The Periodic Table
                                                                                                                                                                                                                                                                                                                                        • MiniLAB Organizing a Personal Periodic Table
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Career
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                                                                                                                                                                        • Lab A Periodic Table of Foods
                                                                                                                                                                                                                                                                                                                                        • Lab Use the Internet Whats in a name
                                                                                                                                                                                                                                                                                                                                        • Science and History A Chilling Story
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Study Guide
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Review
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                            • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                              • Launch Lab Earth Materials at Home and School
                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                              • Section 1 Minerals
                                                                                                                                                                                                                                                                                                                                                • MiniLAB Identifying Salts Crystal System
                                                                                                                                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                • Lab Be a Mineral Detective
                                                                                                                                                                                                                                                                                                                                                  • Section 2 Igneous Rocks
                                                                                                                                                                                                                                                                                                                                                    • Applying Math Extrusive Igneous Rock Classification
                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                      • Section 3 Sedimentary Rocks
                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Evaporites
                                                                                                                                                                                                                                                                                                                                                          • Section 4 Metamorphic Rocks and the Rock Cycle
                                                                                                                                                                                                                                                                                                                                                            • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                            • Visualizing Shock Metamorphic Rock
                                                                                                                                                                                                                                                                                                                                                            • Lab Identifying Rocks
                                                                                                                                                                                                                                                                                                                                                            • Science and Society Earth Materials at Work
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Study Guide
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Review
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                  • Launch Lab Have you got the time
                                                                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                                                                  • Section 1 Weathering and Soil
                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing a Disappearing Seasoning
                                                                                                                                                                                                                                                                                                                                                                    • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                    • Lab Graphing Soil Textures
                                                                                                                                                                                                                                                                                                                                                                      • Section 2 Shaping the Landscape
                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Runoff
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                          • Section 3 Groundwater
                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Porosity Volume
                                                                                                                                                                                                                                                                                                                                                                            • Visualizing The Role of Groundwater in Shaping Earths Surface
                                                                                                                                                                                                                                                                                                                                                                            • Integrate Environment
                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                              • Section 4 Geologic Time
                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                                                                                                • Lab Its about time - relative that is
                                                                                                                                                                                                                                                                                                                                                                                • Science and Society Tapping into the Underground
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Review
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                      • Unit 6 Interactions of Matter
                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                          • Lab Chemical Bonds and Mixing
                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Stability in Bonding
                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                            • Lab Atomic Trading Cards
                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Types of Bonds
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Observing a Bond Type
                                                                                                                                                                                                                                                                                                                                                                                                • Visualizing Polar Molecules
                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Writing Formulas and Naming Compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math Determining a Formula
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Science Can you name binary ionic compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Making a Hydrate
                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Model and Invent - Modeling Chemical Bonding
                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Sticky Subject
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Review
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab RustingmdashA Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Chemical Changes
                                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Designing a Team Equation
                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Chemical Equations
                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math Barium Sulfate Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Classifying Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 4 Reaction Rates and Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing Chemical Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Creating a Colorful Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab To Glow or Not to Glow
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Investigating Reaction Conditions
                                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Clumsy Move Pays Off
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Review
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab Magic Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 How Solutions Form
                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                                                                                                                                                                                                                                                            • Visualizing Metal Alloys
                                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Observing the Effect of Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Solubility and Concentration
                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Acids Bases and Salts
                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing Acid Relief
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Strength of Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Determining Acidity
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Saturated Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and Society Acid Rain
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab The Size of a Nucleus
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Strong Force
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Nuclear Decay
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Detecting Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math The Age of Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Social Studies
                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Nuclear Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling a Nuclear Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Visualizing PET Scans
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Chain Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Model and Invent Modeling Transmutations
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and History The Nuclear Alchemist
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Study Guide
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                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 26 Stars and Galaxies
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab Stars in the Sky
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Observing the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling a Telescope
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math The Magnifying Power of Telescopes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Evolution of Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Counting Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing H-R Diagrams of Star Clusters
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Star Cluster Age
                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 3 Galaxies and the Milky Way
                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 4 Cosmology
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Lab Model and Invent - Expansion of the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Science and Language Arts Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Student Resources
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 1 The Nature of Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 2 Science Technology and Society
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 3 Motion Acceleration and Forces
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 4 The Laws of Motion
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 5 Energy
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 6 Work and Machines
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 8 The Solar System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 9 Heat and States of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 10 Waves
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 11 Sound and Light
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 26 Stars and Galaxies
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Page 24: 706 S1 318-326 GPS09 - Light-and-Sound - home · PDF fileWhat sound does a ruler make? ... sound waves cannot travel in empty space where there are no particles. ... sound travels

SECTION 4 Light and Color 341

Cones and Rods Your eyes have three types of cones each ofwhich responds to a different range of wavelengths Red conesrespond to mostly red and yellow light Green cones respond tomostly yellow and green light Blue cones respond to mostlyblue and violet light The second type of cell in the retina calleda rod is sensitive to dim light and enables you to see at nightHowever rod cells do not enable you to see colors

Interpreting Color Why does a bananalook yellow The light reflected by the

banana causes the cone cells that are sensitive to red and greenlight to send signals to your brain Your brain could get the samesignal if a mixture of red light and green light reached your eyesThis mixture also would cause your red and green cones torespond and you would see the color yellow As a result lightwith wavelengths corresponding to yellow light and light that isa mixture of red and green light both cause the color yellow tobe seen What happens when you look at a white shirt You seewhite when all wavelengths of visible light enters your eyes Thenall three sets of cones cells send signals to the brain The com-bination of these signals cause you to see the shirt as white

Color Blindness If one or more of your sets of cone cellsdo not function properly you might not be able to distinguishcertain colors This condition is called color blindness orcolor deficiency About eight percent of men and one-halfpercent of women have some form of color blindness Themost common form of color blindness makes it difficult todistinguish between red and green Figure 27 shows an imagethat is used in a test for redndashgreen color blindness Becausered and green are used in traffic signals drivers and pedestri-ans must be able to identify them

Retina

Rod

Cone

Lens

Figure 27 Color blindness is an

inherited sex-linked condition in

which certain sets of cones in the

retina do not function properly

Identify the number that you seein the dots

Figure 26 Light enters the eye

and focuses on the retina The two

types of light-detecting cells

that make up the retina

are called rods and cones

GPS+_341

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1070482

eng - iTunNORM 00000340 00000000 00002026 00000000 000155F0 00000000 0000607C 00000000 0000097D 00000000

342 CHAPTER 11 Sound and Light

Mixing ColorsIf you have ever browsed through a paint store you have

probably seen displays where customers can select paint samplesof almost every imaginable color The colors are a result of mix-tures of pigments For example you might have mixed blue andyellow paint to produce green paint A pigment is a coloredmaterial that is used to change the color of other substancesThe color of a pigment results from the different wavelengths oflight that the pigment reflects

Mixing Colored Lights From the glowing orange of a sun-set to the deep blue of a mountain lake all the colors you see canbe made by mixing three colors of light These three colorsmdashred green and bluemdashare the primary colors of light They cor-respond to the three different types of cones in the retina ofyour eye When mixed together in equal amounts they producewhite light as Figure 28 shows Mixing the primary colors indifferent proportions can produce the colors you see

What are the primary colors of light

Paint Pigments If you were to mix equal amounts of redgreen and blue paint would you get white paint If mixing col-ors of paint were like mixing colors of light you would but mix-ing paint is different Paints are made with pigments Pigmentsproduce color as a result of the wavelengths of light they reflectPaint pigments usually are made of chemical compounds suchas titanium oxide a bright white pigment and lead chromatewhich is used for painting yellow lines on highways

Figure 28 White light is pro-

duced when the three primary col-

ors of light are mixed in equal

amounts

Color for PhotosynthesisPlant pigments determinethe wavelengths oflight for photosynthesisLeaves usually look greenbecause of the pigmentchlorophyll Chlorophyllabsorbs most wave-lengths of visible lightexcept green which itreflects However not allplants are green Researchdifferent plant pigmentsto find out how they allowplant species to survive indiverse habitats

GPS+_342

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89129135

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SECTION 4 Light and Color 343

Self Check

1 Identity what colors are reflected and what colors are

absorbed if a white light shines on a red shirt

2 Discuss how the primary colors of light differ from the

primary pigment colors

3 Explain why a red apple would appear black if you

looked at it through a blue filter

4 Determine why a white fence appears to be white instead

of multicolored if all colors are present in white light

5 Think Critically Light reflected from an object passes

through a green filter then a red filter and finally a

blue filter What color will the object seem to be

Summary

Why Objects Have Color

bull The color of an object is determined by the

wavelengths of light it reflects

bull The color of a filter is the color of the light the

filter transmits

Seeing Color

bull Rod and cone cells are light-sensitive cells

found in the retina of the human eye

bull Rod cells are sensitive to dim light Cone cells

enable colors to be seen

bull There are three types of cone cells One type

responds to red light another to green light

and another to blue light

Mixing Colors

bull Red green and blue are the primary light

colors Any color of light can be created by

mixing these primary light colors

bull Any pigment color can be formed by mixing

the primary pigment colorsmdashmagenta cyan

and yellow

6 Use Percentages In the human eye there are about

120000000 rods If 90000000 rods trigger at once

what percentage of the total number of rods triggered

7 Convert Units The wavelengths of light are measured

in nanometers (nm) which equals 0000001 mm

Find the wavelength in mm of a light wave that has a

wavelength of 690 nm

Mixing Pigments You can make any pigment color by mixingdifferent amounts of the three primary pigmentsmdashmagenta(bluish red) cyan (greenish blue) and yellow In fact color print-ers use these pigments as well as black ink to make full-colorprints like the pages in this book A primary pigmentrsquos colordepends on the wavelengths of the light that it reflects Actuallypigments both absorb and reflect a range of colors in sending asingle color message to your eye For example in white lightyellow pigment appears yellow because it reflects red and greenlight but absorbs the other wavelengths of visible light The colorof a mixture of two primary pigments is determined by theprimary colors of light that both pigments reflect

Look at Figure 29 The area in the center where the colors alloverlap appears to be black because the three blended primarypigments absorb all the primary colors of light Recall that theprimary colors of light combine to produce white light They arecalled additive colors However when the primary pigment col-ors are combined they absorb all wavelengths of visible light andproduce black Because black results from the absence ofreflected light the primary pigments are called subtractive colors

Figure 29 The three primary

pigment colors appear to be black

when they are mixed

Describe how the primary pigmentcolors are similar to the primary col-ors of light

More Section Review gpesciencecom

GPS+_343

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7230715

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Design Your OwnDesign Your Own

344

Real-World ProblemWhat loud noises do you enjoy and which ones do you find annoying

Most people enjoy a music concert performed by their favorite artist or

the booming displays of fireworks on the Fourth of July Most people

enjoy these loud sounds for short periods of time However certain

other loud noises such as traffic sirens and loud talking can be

annoying Constant annoying noises are called noise pollution What

can be done to reduce noise pollution What types of barriers will best

block out noise pollution

Form a HypothesisBased on your experiences with loud noises form a hypothesis that

predicts the effectiveness of different types of barriers at blocking out

noise pollution

Test Your HypothesisMake a Plan

1 Complete the safety form

2 Decide what type of barriers or materials you will test

3 Describe exactly how you will use these materials

Goals Design an experiment

that tests the effective-

ness of various types of

barriers and materials

for blocking out noise

pollution

Test different types of

materials and barriers

to determine the best

noise blocks

Possible Materialsradio CD player horn

drum or other loud

noise source

shrubs trees concrete

walls brick walls stone

walls wooden fences

parked cars or hanging

laundry

sound meter

meterstick or metric tape

measure

Blocking NfisePollution

4 Identify the controls and variables you will use in your

experiment

5 List the steps you will use and describe each step precisely

6 Prepare a data table in your Science Journal to record your

measurements

7 Organize the steps of your experiment in logical order

Follow Your Plan

1 Ask your teacher to approve your plan and data table before

you start

2 Conduct your experiment as planned

3 Test each barrier two or three times

4 Record the results from each test in your data table in your Science Journal

Analyze Your Data1 Identify the barriers that most effectively reduced noise pollution

2 Identify the barriers that least effectively reduced noise pollution

3 Compare the effective barriers and identify common characteristics that might

explain why they reduced noise pollution

4 Compare the natural barriers you tested with the artificial barriers Which type

of barrier best reduced noise pollution

5 Compare the different types of materials the barriers were made of Which

type of material best reduced noise pollution

Conclude and Apply1 Evaluate whether your results support your hypothesis

2 Predict how your results would differ if you used a louder source of noise such

as a siren

3 Infer from your results how people living near a

busy street could reduce noise pollution

4 Identify major sources of noise pollution in or

near your home How could they be reduced

5 Research how noise pollution can be

unhealthy

LAB 345

Draw a poster illustrating how builders and

landscapers could use certain materials to

better insulate a home or office from excess

noise pollution

346 CHAPTER 11 Sound and Light

A Haiku GardenThe Four Seasons in Poems and Prints

by Stephen Addiss with Fumiko and Akira Yamamoto

Respond to the Reading1 How do the illustrations help the reader

better understand the poems2 What do you think is meant by the

word lingering in the Haiku about springsunlight

3 Linking Science and Writing Writeone haiku about summer and anotherabout fall In one poem use color tohelp you describe the season In theother use light or some property oflight to help describe the season

Research has deter-mined that there is a

connection between color and mood Warmcolors have longer wavelengths and can bemore stimulating Cool colors which haveshorter wavelengths tend to have a calmingor soothing effect on people Light and colorhave long been used as literary symbols Doesthe use of color change what you imaginewhen you read the haiku

UnderstandingLiteratureJapanese Haiku A haiku is a verse thatconsists of three lines and 17 syllables inthe Japanese language The first and thirdlines have five syllables each and themiddle line has seven syllables Why isimagination important in reading haiku

Lingering

in every pool of watermdash

spring sunlightIssa

Withered by winter

the sound of the windmdash

one-color worldBasho

Sound

1 Sound waves are compressional waves thattravel only in matter

2 The speed of sound in a material dependson the type of material as well as itstemperature

3 Loudness depends on a sound waversquos inten-sity Pitch depends on a sound waversquosfrequency

4 Sound waves are used in echolocationsonar and medical imaging

Reflection and Refractionof Light

1 Light can be absorbed reflected or trans-mitted by a material

2 When light waves are reflected theyobey the law of reflectionmdashthe angle ofincidence equals the angle of reflection

3 A light wave is refracted or bent whenit changes speed as it travels at an anglefrom one material to another

Mirrors Lenses andthe Eye

1 Plane mirrors form upright virtual images

2 Images formed by concave mirrors andconvex lenses depend on the location ofthe object relative to the focal point

3 Convex mirrors and concave lenses formvirtual upright images that are smallerthan the object

4 The lens in the human eye changes shape toproduce a sharp image on the retina

Light and Color

1 You see color when light is reflected offobjects and into your eyes

2 Cone cells in the retina are light-sensitivecells that enable you to distinguish colors

3 Red blue and green are the three primarycolors of light and can be mixed to form allother colors

4 The primary pigment colors are magentacyan and yellow

CHAPTER STUDY GUIDE 347

Use the Foldable you made at the beginningof the chapter to help you review sound and light

Interactive Tutor gpesciencecom

Complete each statement with the correctvocabulary word or phrase

1 A change in frequency due to a movingsound source is due to the

2 A flat smooth surface that reflects light andforms an image is a(n)

3 An object is if you can seethrough it clearly

4 The of a material indicates howmuch the speed of light in the materialchanges as light passes through

5 You can change the color of white paint byadding a(n) to it

6 A(n) is a reflecting surface thatcurves outward like the back of a spoon

7 The human perception of the intensity of asound wave is

Choose the word or phrase that best answerseach question

8 Which of the following best describes imageformation by a plane mirrorA) A real image is formed in front of the mirrorB) A real image is formed behind the mirrorC) A virtual image is formed in front of the

mirrorD) A virtual image is formed behind the mirror

9 For a sound with low pitch what else isalso always lowA) amplitude C) wavelengthB) frequency D) wave velocity

10 Which of the following occurs when asound source moves away from youA) The soundrsquos velocity decreasesB) The soundrsquos loudness increasesC) The soundrsquos frequency decreasesD) The soundrsquos frequency increases

Use the table below to answer question 11

11 Based on the data in the table abovewhich of the following would be the speedof sound in air at 30degCA) 3404 ms C) 3494 msB) 3464 ms D) 3534 ms

12 What happens to a light ray travelingparallel to the optical axis of a convexlens that passes through the lensA) It travels parallel to the optical axisB) It passes through the focal pointC) It is bent away from the optical axisD) It forms a virtual image

13 Light waves of which color are bent mostwhen passing through a prismA) blue C) violetB) red D) yellow

14 Which way does a concave lens bend lightA) toward its optical axisB) toward its centerC) toward its edgesD) toward its focal point

Speed of Sound in Air

Temp peed( s)

4

4

4

348 CHAPTER REVIEW

concave lens p 335concave mirror p 332convex lens p 333convex mirror p 333decibel p 322Doppler effect p 323index of refraction p 329intensity p 322

loudness p 322opaque p 327pigment p 342pitch p 323plane mirror p 331translucent p 327transparent p 327

Vocabulary PuzzleMaker gpesciencecom

Use the illustration below to answer question 15

15 Describe how the position of the candlechanged if the image of the candle movedaway from the focal point

16 Apply Acoustic scientists sometimes doresearch in rooms that absorb all soundwaves How could such a room be used tostudy how bats find their food

17 Compare White light passes through atranslucent pane of glass and shines on ashirt Both the translucent glass and theshirt appear green Compare the colors oflight that are absorbed and transmitted bythe glass and the shirt

18 Infer Most mammals including dogs andcats canrsquot see colors Infer how the retinaof a catrsquos eye might be different from theretina of a human eye

19 Determine whether a convex lens could forman image that is enlarged real and upright

20 Infer A car comes to a railroad crossingThe driver hears a trainrsquos whistle and itspitch becomes lower What can beassumed about how the train is moving

21 Compare and contrast the reflection of lightfrom a white wall with a rough surfacewith the reflection of light from a mirror

Optical axis

One

focal

length

Two

focal

lengths

Image

Ray A

Object

Focal

point

Interpreting Graphics 22 Infer why a convex mirror and a concavelens can never produce a real image

23 Predict what color a white shirt wouldappear to be if the light reflected from theshirt passed through a red filter and thenthrough a green filter

24 Explain why windows might begin to rattlewhen an airplane flies overhead

25 Communicate Some people enjoy usingsnowmobiles Others object to the noisethat they make Write a proposal for a pol-icy that seems fair to both groups for theuse of snowmobiles in a state park

CHAPTER REVIEW 349

Use the wave speed equation ν ƒλ to answer

questions 26 and 27

26 Calculate Frequency A sonar pulse has awavelength of 30 cm and a speed inwater of 1500 ms Find its frequency

27 Calculate Wavelength What is the wave-length of a sound wave with a fre-quency of 440 Hz if the speed of soundin air is 340 ms

28 Calculate Angle of Incidence A light ray isreflected from a mirror If the anglebetween the incident ray and thereflected ray is 136deg what is the angleof incidence

29 Determine Object Distance You hold anobject in front of a concave mirror witha focal length of 30 cm If you do notsee a reflected image how far from themirror is the object

30 Calculate Speed The speed of light in avacuum is 300000 kms If the index ofrefraction of water is 133 what is thespeed of light in water

More Chapter Review gpesciencecom

1 Which of the following describes the imageformed by a convex mirror

A enlarged

B inverted

C real

D virtual

Use the figure below to answer question 2

2 Which of the following describes a light raythat passes through the focal point andthen is reflected by the mirror

A It travels parallel to the optical axis

B It forms a real image

C It is reflected back through the focal point

D It forms a virtual image

3 Why does an apple look red

A It reflects red light

B It absorbs red light

C It reflects green and blue light

D It reflects all colors of light except red

Use the figure below to answer questions 4 and 5

4 When the primary colors of light are addedtogether what color appears in area H

A cyan

B magenta

C white

D yellow

5 When the primary colors of light are addedtogether what color appears in area G

A cyan

B magenta

C white

D yellow

6 Which of the following increases as the fre-quency of a sound increases

A amplitude

B intensity

C loudness

D pitch

Red Blue

Green

F

H

G K

Focal pointOptical axis

350 STANDARDIZED TEST PRACTICE

Record your answers on the answer sheet provided by your teacher or on a sheet of paper

STANDARDIZED TEST PRACTICE 351

7 Which of the following parts of the eyeenable you to see colors in bright light

A cone cells

B cornea

C lens

D rod cells

Use the graph below to answer questions 8 and 9

8 Determine how far in centimeters theimage is from the lens when the object is15 centimeters from the lens

9 How far in centimeters is the object fromthe lens when the image distance andobject distance are equal

10 A shirt has stripes that are black and whitein white light If green light shines on thisshirt what colors will the black and whitestripes be

11 If you are on a moving train what hap-pens to the pitch of a crossing bell as youapproach the crossing and then moveaway from the crossing

Use the figure below to answer question 12

12 Describe the vision problem show by thefigure and explain how this vision prob-lem can be corrected

13 Explain why the human eye can see colorsbetter in bright light than in dim light

Image Distance fora Convex Lens

Ima

ge

dis

tan

ce (

cm)

30

25

20

15

10

5 10 15 20 25 30

Object distance (cm)

Standardized Test Practice gpesciencecom

Note Units Read carefully and make note of the units used in

any measurement

  • Glencoe Physical Science with Earth Science
    • Student Edition Table of Contents
      • Unit 1 Science and Technology
        • Chapter 1 The Nature of Science
          • Launch Lab Understanding Measurements
          • Foldables
          • Section 1 The Methods of Science
            • Science Online
            • Integrate History
            • Integrate Earth Science
            • Science Online
              • Section 2 Standards of Measurement
                • Applying Math Centimeters
                • Integrate Earth Science
                • Science Online
                • MiniLAB Determining the Density of a Pencil
                • Visualizing SI Dimensions
                  • Section 3 Communicating with Graphs
                    • Applying Math Temperature
                    • MiniLAB Graphing Temperature Change
                    • Lab Whats my graph
                    • Lab Design Your Own - Developing a Measurement System
                    • Science and Language Arts Thinking in Pictures and Other Reports from My Life with Autism
                      • Chapter 1 Study Guide
                      • Chapter 1 Review
                      • Chapter 1 Standardized Test Practice
                        • Chapter 2 Science Technology and Society
                          • Lab Technology in Your Life
                          • Foldables
                          • Section 1 Science and Technology
                            • MiniLAB Researching the Past
                            • Visualizing Technology Supplying Basic Needs
                            • Science Online
                              • Section 2 Forces that Shape Technology
                                • MiniLAB Evaluating the Benefits and Consequences of Technology
                                • Integrate Environment
                                • Integrate History
                                • Applying Science What impact does the accident at Chernobyl have on the future of nuclear power
                                • Science Online
                                • Lab Who contributes CO2
                                  • Section 3 Developing Technology
                                    • Integrate Life Science
                                    • Integrate Career
                                    • Lab Model and Invent - Care Package
                                    • Oops Accidents in Science A Slippery Situation
                                      • Chapter 2 Study Guide
                                      • Chapter 2 Review
                                      • Chapter 2 Standardized Test Practice
                                          • Unit 2 Motion Forces and Energy
                                            • Chapter 3 Motion Acceleration and Forces
                                              • Launch Lab Compare Speeds
                                              • Foldables
                                              • Section 1 Describing Motion
                                                • MiniLAB Measuring Average Speed
                                                • Science Online
                                                • Applying Math Average Speed
                                                • Integrate Astronomy
                                                • Science Online
                                                  • Section 2 Acceleration
                                                    • Integrate History
                                                    • Visualizing Acceleration
                                                      • Section 3 Motion and Forces
                                                        • Science Online
                                                        • MiniLAB Comparing Friction
                                                        • Lab Force and Acceleration
                                                        • Lab Design Your Own - Comparing Motion from Different Forces
                                                        • Science and Language Arts A Brave and Startling Truth
                                                          • Chapter 3 Study Guide
                                                          • Chapter 3 Review
                                                          • Chapter 3 Standardized Test Practice
                                                            • Chapter 4 The Laws of Motion
                                                              • Launch Lab The Force of Gravity
                                                              • Foldables
                                                              • Section 1 The First Two Laws of Motion
                                                                • MiniLAB Observing Inertia
                                                                • Science Online
                                                                • Applying Math The Acceleration of a Sled Solve a Simple Equation
                                                                  • Section 2 Gravity
                                                                    • Science Online
                                                                    • Integrate Earth Science
                                                                    • MiniLAB Observing Centripetal Force
                                                                    • Lab Gravity and Air Resistance
                                                                      • Section 3 The Third Law of Motion
                                                                        • Integrate Career
                                                                        • Visualizing Rocket Motion
                                                                        • Applying Math The Momentum of a Sprinter
                                                                        • Lab The Momentum of Colliding Objects
                                                                        • Science and History Newton and the Plague
                                                                          • Chapter 4 Study Guide
                                                                          • Chapter 4 Review
                                                                          • Chapter 4 Standardized Test Practice
                                                                            • Chapter 5 Energy
                                                                              • Launch Lab Energy Conversions
                                                                              • Foldables
                                                                              • Section 1 The Nature of Energy
                                                                                • Science Online
                                                                                • Applying Math Kinetic Energy
                                                                                • MiniLAB Interpreting Data from a Slingshot
                                                                                • Integrate Language Arts
                                                                                • Applying Math Gravitational Potential Energy
                                                                                • Lab Bouncing Balls
                                                                                  • Section 2 Conservation of Energy
                                                                                    • Visualizing Energy Transformations
                                                                                    • Integrate Environment
                                                                                    • MiniLAB Transforming Energy in a Paper Clip
                                                                                    • Science Online
                                                                                    • Integrate Health
                                                                                    • Lab Design Your Own - Swinging Energy
                                                                                    • Science and History The Impossible Dream
                                                                                      • Chapter 5 Study Guide
                                                                                      • Chapter 5 Review
                                                                                      • Chapter 5 Standardized Test Practice
                                                                                        • Chapter 6 Work and Machines
                                                                                          • Launch Lab Doing Work with a Simple Machine
                                                                                          • Foldables
                                                                                          • Section 1 Work
                                                                                            • Integrate Language Arts
                                                                                            • Applying Math Work
                                                                                            • MiniLAB Calculating Your Work and Power
                                                                                            • Applying Math Power
                                                                                              • Section 2 Using Machines
                                                                                                • MiniLAB Machines Multiplying Force
                                                                                                • Science Online
                                                                                                • Integrate Chemistry
                                                                                                  • Section 3 Simple Machines
                                                                                                    • Integrate History
                                                                                                    • Visualizing Levers in the Human Body
                                                                                                    • Science Online
                                                                                                    • Lab Levers
                                                                                                    • Lab Model and Invent - Using Simple Machines
                                                                                                    • Science and Society The Science of Very Very Small
                                                                                                      • Chapter 6 Study Guide
                                                                                                      • Chapter 6 Review
                                                                                                      • Chapter 6 Standardized Test Practice
                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                          • Launch Lab Relative Sizes of Earth the Moon and the Sun
                                                                                                          • Foldables
                                                                                                          • Section 1 Earth in Space
                                                                                                            • Science Online
                                                                                                            • Integrate Physics
                                                                                                              • Section 2 Time and Seasons
                                                                                                                • MiniLAB Modeling the Suns Rays at Solstice
                                                                                                                • Lab Comparing the Angle of Sunlight to Intensity
                                                                                                                  • Section 3 Earths Moon
                                                                                                                    • Applying Math Tides
                                                                                                                    • MiniLAB Modeling Phases and Eclipses
                                                                                                                    • Integrate History
                                                                                                                    • Integrate History
                                                                                                                    • Science Online
                                                                                                                    • Visualizing Water on the Moon
                                                                                                                    • Lab Identifying the Moons Surface Features and Apollo Landing Sites
                                                                                                                    • Oops Accidents in Science Even Great Scientists Make Mistakes
                                                                                                                      • Chapter 7 Study Guide
                                                                                                                      • Chapter 7 Review
                                                                                                                      • Chapter 7 Standardized Test Practice
                                                                                                                        • Chapter 8 The Solar System
                                                                                                                          • Launch Lab The Size of the Solar System
                                                                                                                          • Foldables
                                                                                                                          • Section 1 Planet Motion
                                                                                                                            • Integrate History
                                                                                                                            • MiniLAB Plotting Retrograde Motion
                                                                                                                            • Integrate Physics
                                                                                                                            • Applying Math Heliocentric Longitude (HL)
                                                                                                                              • Section 2 The Inner Planets
                                                                                                                                • Science Online
                                                                                                                                • Integrate Chemistry
                                                                                                                                • Lab Interpreting Features of Marss Surface
                                                                                                                                  • Section 3 The Outer Planets
                                                                                                                                    • Integrate Language Arts
                                                                                                                                    • Visualizing What Galileo Saw
                                                                                                                                    • Science Online
                                                                                                                                    • MiniLAB Comparing Sizes of Outer and Inner Planets
                                                                                                                                      • Section 4 Life in the Solar System
                                                                                                                                        • Lab Design Your Own - Testing Unknown Soil Samples for Life
                                                                                                                                        • Science Stats Night Sky Wonders
                                                                                                                                          • Chapter 8 Study Guide
                                                                                                                                          • Chapter 8 Review
                                                                                                                                          • Chapter 8 Standardized Test Practice
                                                                                                                                              • Unit 3 Energy in Motion
                                                                                                                                                • Chapter 9 Heat and States of Matter
                                                                                                                                                  • Launch Lab Expansion of a Gas
                                                                                                                                                  • Foldables
                                                                                                                                                  • Section 1 Temperature and Thermal Energy
                                                                                                                                                    • Applying Math Converting to Celsius
                                                                                                                                                    • Science Online
                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                    • Applying Math Change in Thermal Energy
                                                                                                                                                      • Section 2 States of Matter
                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                        • Science Online
                                                                                                                                                        • MiniLAB Comparing States of Water
                                                                                                                                                          • Section 3 Transferring Thermal Energy
                                                                                                                                                            • MiniLAB Comparing Thermal Conductors
                                                                                                                                                            • Visualizing Convection Currents
                                                                                                                                                            • Lab Convection in Gases and Liquids
                                                                                                                                                              • Section 4 Using Thermal Energy
                                                                                                                                                                • Integrate History
                                                                                                                                                                • Science Online
                                                                                                                                                                • Lab Conduction in Gases
                                                                                                                                                                • Science Stats Surprising Thermal Energy
                                                                                                                                                                  • Chapter 9 Study Guide
                                                                                                                                                                  • Chapter 9 Review
                                                                                                                                                                  • Chapter 9 Standardized Test Practice
                                                                                                                                                                    • Chapter 10 Waves
                                                                                                                                                                      • Launch Lab How do waves transfer energy
                                                                                                                                                                      • Foldables
                                                                                                                                                                      • Section 1 The Nature of Waves
                                                                                                                                                                        • Visualizing Formation of Ocean Waves
                                                                                                                                                                        • Science Online
                                                                                                                                                                          • Section 2 Wave Properties
                                                                                                                                                                            • MiniLAB Observing Wavelength
                                                                                                                                                                            • Integrate Social Studies
                                                                                                                                                                            • Applying Math The Speed of Sound
                                                                                                                                                                            • Lab Wave Speed and Tension
                                                                                                                                                                              • Section 3 The Behavior of Waves
                                                                                                                                                                                • Science Online
                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                • MiniLAB Experimenting with Resonance
                                                                                                                                                                                • Lab Measuring Wave Properties
                                                                                                                                                                                • Science and History Making Waves
                                                                                                                                                                                  • Chapter 10 Study Guide
                                                                                                                                                                                  • Chapter 10 Review
                                                                                                                                                                                  • Chapter 10 Standardized Test Practice
                                                                                                                                                                                    • Chapter 11 Sound and Light
                                                                                                                                                                                      • Launch Lab What sound does a ruler make
                                                                                                                                                                                      • Foldables
                                                                                                                                                                                      • Section 1 Sound
                                                                                                                                                                                        • MiniLAB Comparing Intensity
                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                        • Science Online
                                                                                                                                                                                        • Applying Math Using Sonar
                                                                                                                                                                                          • Section 2 Reflection and Refraction of Light
                                                                                                                                                                                          • Section 3 Mirrors Lenses and the Eye
                                                                                                                                                                                            • Visualizing Images Formed by a Convex Lens
                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                            • MiniLAB Experimenting with Focal Lengths
                                                                                                                                                                                            • Lab Reflections of Reflections
                                                                                                                                                                                              • Section 4 Light and Color
                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Lab Design Your Own - Blocking Noise Pollution
                                                                                                                                                                                                • Science and Language Arts A Haiku Garden The Four Seasons in Poems and Print
                                                                                                                                                                                                  • Chapter 11 Study Guide
                                                                                                                                                                                                  • Chapter 11 Review
                                                                                                                                                                                                  • Chapter 11 Standardized Test Practice
                                                                                                                                                                                                    • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                      • Launch Lab Global Jigsaw Puzzle
                                                                                                                                                                                                      • Foldables
                                                                                                                                                                                                      • Section 1 Evolution of Earths Crust
                                                                                                                                                                                                        • Applying Math Spreading Distances
                                                                                                                                                                                                        • Integrate Physics
                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                          • Section 2 Earthquakes
                                                                                                                                                                                                            • MiniLAB Demonstrating Four Types of Stress
                                                                                                                                                                                                            • Visualizing Earthquake-Proof Buildings
                                                                                                                                                                                                              • Section 3 Earths Interior
                                                                                                                                                                                                              • Section 4 Volcanoes
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • MiniLAB Modeling Lava Viscosity
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                • Lab A Case for Pacific Plate Motion
                                                                                                                                                                                                                • Lab Earthquake Earthquake Wheres the earthquake
                                                                                                                                                                                                                • Science and History Volcano Weather
                                                                                                                                                                                                                  • Chapter 12 Study Guide
                                                                                                                                                                                                                  • Chapter 12 Review
                                                                                                                                                                                                                  • Chapter 12 Standardized Test Practice
                                                                                                                                                                                                                      • Unit 4 Forms of Energy
                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                          • Launch Lab Electric Circuits
                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                          • Section 1 Electric Charge
                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                            • Visualizing Lightning
                                                                                                                                                                                                                            • MiniLAB Investigate Charged Objects
                                                                                                                                                                                                                              • Section 2 Electric Current
                                                                                                                                                                                                                                • MiniLAB Investigating Battery Addition
                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                • Lab Identifying Conductors and Insulators
                                                                                                                                                                                                                                  • Section 3 Electrical Energy
                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                    • Applying Math Power Used by a Clothes Dryer
                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                    • Applying Math Electrical Energy Used by a Microwave Oven
                                                                                                                                                                                                                                    • Lab Design Your Own - Comparing Series and Parallel Circuits
                                                                                                                                                                                                                                    • Science and Language Arts Invisible Man
                                                                                                                                                                                                                                      • Chapter 13 Study Guide
                                                                                                                                                                                                                                      • Chapter 13 Review
                                                                                                                                                                                                                                      • Chapter 13 Standardized Test Practice
                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                          • Launch Lab The Strength of Magnets
                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                          • Section 1 Magnetism
                                                                                                                                                                                                                                            • MiniLAB Observing Magnetic Interference
                                                                                                                                                                                                                                            • Integrate Earth Science
                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                            • Applying Science How can magnetic parts of a junk car be salvaged
                                                                                                                                                                                                                                            • MiniLAB Making Your Own Compass
                                                                                                                                                                                                                                              • Section 2 Electricity and Magnetism
                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                  • Section 3 Producing Electric Current
                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                    • Visualizing Motors and Generators
                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                    • Lab Electricity and Magnetism
                                                                                                                                                                                                                                                    • Lab Design Your Own - Controlling Electromagnets
                                                                                                                                                                                                                                                    • Science and History Body Art
                                                                                                                                                                                                                                                      • Chapter 14 Study Guide
                                                                                                                                                                                                                                                      • Chapter 14 Review
                                                                                                                                                                                                                                                      • Chapter 14 Standardized Test Practice
                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                          • Launch Lab Can electromagnetic waves change materials
                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                          • Section 1 What are electromagnetic waves
                                                                                                                                                                                                                                                            • MiniLAB Investigating Electromagnetic Waves
                                                                                                                                                                                                                                                            • Applying Math The Speed of Light in Water
                                                                                                                                                                                                                                                              • Section 2 The Electromagnetic Spectrum
                                                                                                                                                                                                                                                                • MiniLAB Heating with Microwaves
                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                • Lab The Shape of Satellite Dishes
                                                                                                                                                                                                                                                                  • Section 3 Radio Communication
                                                                                                                                                                                                                                                                    • Visualizing Radio Broadcasts
                                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Lab Use the Internet - Radio Frequencies
                                                                                                                                                                                                                                                                    • Science and History Riding a Beam of Light
                                                                                                                                                                                                                                                                      • Chapter 15 Study Guide
                                                                                                                                                                                                                                                                      • Chapter 15 Review
                                                                                                                                                                                                                                                                      • Chapter 15 Standardized Test Practice
                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                          • Launch Lab Heating with Solar Energy
                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                          • Section 1 Fossil Fuels
                                                                                                                                                                                                                                                                            • Visualizing The Formation of Fossil Fuels
                                                                                                                                                                                                                                                                            • MiniLAB Designing an Efficient Water Heater
                                                                                                                                                                                                                                                                              • Section 2 Nuclear Energy
                                                                                                                                                                                                                                                                                • Integrate Earth Science
                                                                                                                                                                                                                                                                                • Integrate Social Science
                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                • Applying Science Can a contaminated radioactive site be reclaimed
                                                                                                                                                                                                                                                                                  • Section 3 Renewable Energy Sources
                                                                                                                                                                                                                                                                                    • MiniLAB Using Solar Power at Home
                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                    • Lab Solar Heating
                                                                                                                                                                                                                                                                                    • Lab Use the Internet How much does energy really cost
                                                                                                                                                                                                                                                                                    • Science and Society Reacting to Nuclear Energy
                                                                                                                                                                                                                                                                                      • Chapter 16 Study Guide
                                                                                                                                                                                                                                                                                      • Chapter 16 Review
                                                                                                                                                                                                                                                                                      • Chapter 16 Standardized Test Practice
                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                          • Lab Atmospheric Pressure
                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                          • Section 1 Earths Atmosphere
                                                                                                                                                                                                                                                                                            • MiniLAB Visualizing Convection
                                                                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                                                                            • Lab Visualizing a Temperature Inversion
                                                                                                                                                                                                                                                                                              • Section 2 Weather
                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Coriolis Effect
                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                  • Section 3 Climate
                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                    • Visualizing Earths Biogeophysical System
                                                                                                                                                                                                                                                                                                      • Section 4 Earths Changing Climates
                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                        • Applying Math Carbon Dioxide (CO2) Concentration
                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Investigating Microclimate
                                                                                                                                                                                                                                                                                                        • Science and Language Arts The Grapes of Wrath
                                                                                                                                                                                                                                                                                                          • Chapter 17 Study Guide
                                                                                                                                                                                                                                                                                                          • Chapter 17 Review
                                                                                                                                                                                                                                                                                                          • Chapter 17 Standardized Test Practice
                                                                                                                                                                                                                                                                                                              • Unit 5 Matter and Earth Materials
                                                                                                                                                                                                                                                                                                                • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                  • Launch Lab Demonstrate the Distillation of Water
                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                  • Section 1 Composition of Matter
                                                                                                                                                                                                                                                                                                                    • Visualizing Elements
                                                                                                                                                                                                                                                                                                                    • MiniLAB Classifying Materials
                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                    • Lab Comparing Pure Substances and Mixtures
                                                                                                                                                                                                                                                                                                                      • Section 2 Properties of Matter
                                                                                                                                                                                                                                                                                                                        • Integrate Environment
                                                                                                                                                                                                                                                                                                                        • MiniLAB Separating Ink
                                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                                        • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                        • Applying Math The Law of Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Measuring the Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Science Stats Intriguing Elements
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Study Guide
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Review
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                            • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                              • Launch Lab Inferring What You Cant Observe
                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                              • Section 1 Structure of the Atom
                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling an Aluminum Atom
                                                                                                                                                                                                                                                                                                                                • Visualizing The Atomic Model
                                                                                                                                                                                                                                                                                                                                  • Section 2 Masses of Atoms
                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                    • Applying Science How can radioactive isotopes help tell time
                                                                                                                                                                                                                                                                                                                                      • Section 3 The Periodic Table
                                                                                                                                                                                                                                                                                                                                        • MiniLAB Organizing a Personal Periodic Table
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Career
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                                                                                                                                                                        • Lab A Periodic Table of Foods
                                                                                                                                                                                                                                                                                                                                        • Lab Use the Internet Whats in a name
                                                                                                                                                                                                                                                                                                                                        • Science and History A Chilling Story
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Study Guide
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Review
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                            • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                              • Launch Lab Earth Materials at Home and School
                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                              • Section 1 Minerals
                                                                                                                                                                                                                                                                                                                                                • MiniLAB Identifying Salts Crystal System
                                                                                                                                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                • Lab Be a Mineral Detective
                                                                                                                                                                                                                                                                                                                                                  • Section 2 Igneous Rocks
                                                                                                                                                                                                                                                                                                                                                    • Applying Math Extrusive Igneous Rock Classification
                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                      • Section 3 Sedimentary Rocks
                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Evaporites
                                                                                                                                                                                                                                                                                                                                                          • Section 4 Metamorphic Rocks and the Rock Cycle
                                                                                                                                                                                                                                                                                                                                                            • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                            • Visualizing Shock Metamorphic Rock
                                                                                                                                                                                                                                                                                                                                                            • Lab Identifying Rocks
                                                                                                                                                                                                                                                                                                                                                            • Science and Society Earth Materials at Work
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Study Guide
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Review
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                  • Launch Lab Have you got the time
                                                                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                                                                  • Section 1 Weathering and Soil
                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing a Disappearing Seasoning
                                                                                                                                                                                                                                                                                                                                                                    • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                    • Lab Graphing Soil Textures
                                                                                                                                                                                                                                                                                                                                                                      • Section 2 Shaping the Landscape
                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Runoff
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                          • Section 3 Groundwater
                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Porosity Volume
                                                                                                                                                                                                                                                                                                                                                                            • Visualizing The Role of Groundwater in Shaping Earths Surface
                                                                                                                                                                                                                                                                                                                                                                            • Integrate Environment
                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                              • Section 4 Geologic Time
                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                                                                                                • Lab Its about time - relative that is
                                                                                                                                                                                                                                                                                                                                                                                • Science and Society Tapping into the Underground
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Review
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                      • Unit 6 Interactions of Matter
                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                          • Lab Chemical Bonds and Mixing
                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Stability in Bonding
                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                            • Lab Atomic Trading Cards
                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Types of Bonds
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Observing a Bond Type
                                                                                                                                                                                                                                                                                                                                                                                                • Visualizing Polar Molecules
                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Writing Formulas and Naming Compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math Determining a Formula
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Science Can you name binary ionic compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Making a Hydrate
                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Model and Invent - Modeling Chemical Bonding
                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Sticky Subject
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Review
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab RustingmdashA Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Chemical Changes
                                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Designing a Team Equation
                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Chemical Equations
                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math Barium Sulfate Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Classifying Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 4 Reaction Rates and Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing Chemical Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Creating a Colorful Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab To Glow or Not to Glow
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Investigating Reaction Conditions
                                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Clumsy Move Pays Off
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Review
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab Magic Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 How Solutions Form
                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                                                                                                                                                                                                                                                            • Visualizing Metal Alloys
                                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Observing the Effect of Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Solubility and Concentration
                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Acids Bases and Salts
                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing Acid Relief
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Strength of Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Determining Acidity
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Saturated Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and Society Acid Rain
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab The Size of a Nucleus
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Strong Force
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Nuclear Decay
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Detecting Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math The Age of Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Social Studies
                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Nuclear Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling a Nuclear Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Visualizing PET Scans
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Chain Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Model and Invent Modeling Transmutations
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and History The Nuclear Alchemist
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 26 Stars and Galaxies
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab Stars in the Sky
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Observing the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling a Telescope
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math The Magnifying Power of Telescopes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Evolution of Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Counting Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing H-R Diagrams of Star Clusters
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Star Cluster Age
                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 3 Galaxies and the Milky Way
                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 4 Cosmology
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Lab Model and Invent - Expansion of the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Science and Language Arts Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Standardized Test Practice
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 1 The Nature of Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 2 Science Technology and Society
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 3 Motion Acceleration and Forces
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 4 The Laws of Motion
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 5 Energy
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 6 Work and Machines
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 8 The Solar System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 9 Heat and States of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 10 Waves
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 11 Sound and Light
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 26 Stars and Galaxies
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Page 25: 706 S1 318-326 GPS09 - Light-and-Sound - home · PDF fileWhat sound does a ruler make? ... sound waves cannot travel in empty space where there are no particles. ... sound travels

342 CHAPTER 11 Sound and Light

Mixing ColorsIf you have ever browsed through a paint store you have

probably seen displays where customers can select paint samplesof almost every imaginable color The colors are a result of mix-tures of pigments For example you might have mixed blue andyellow paint to produce green paint A pigment is a coloredmaterial that is used to change the color of other substancesThe color of a pigment results from the different wavelengths oflight that the pigment reflects

Mixing Colored Lights From the glowing orange of a sun-set to the deep blue of a mountain lake all the colors you see canbe made by mixing three colors of light These three colorsmdashred green and bluemdashare the primary colors of light They cor-respond to the three different types of cones in the retina ofyour eye When mixed together in equal amounts they producewhite light as Figure 28 shows Mixing the primary colors indifferent proportions can produce the colors you see

What are the primary colors of light

Paint Pigments If you were to mix equal amounts of redgreen and blue paint would you get white paint If mixing col-ors of paint were like mixing colors of light you would but mix-ing paint is different Paints are made with pigments Pigmentsproduce color as a result of the wavelengths of light they reflectPaint pigments usually are made of chemical compounds suchas titanium oxide a bright white pigment and lead chromatewhich is used for painting yellow lines on highways

Figure 28 White light is pro-

duced when the three primary col-

ors of light are mixed in equal

amounts

Color for PhotosynthesisPlant pigments determinethe wavelengths oflight for photosynthesisLeaves usually look greenbecause of the pigmentchlorophyll Chlorophyllabsorbs most wave-lengths of visible lightexcept green which itreflects However not allplants are green Researchdifferent plant pigmentsto find out how they allowplant species to survive indiverse habitats

GPS+_342

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89129135

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SECTION 4 Light and Color 343

Self Check

1 Identity what colors are reflected and what colors are

absorbed if a white light shines on a red shirt

2 Discuss how the primary colors of light differ from the

primary pigment colors

3 Explain why a red apple would appear black if you

looked at it through a blue filter

4 Determine why a white fence appears to be white instead

of multicolored if all colors are present in white light

5 Think Critically Light reflected from an object passes

through a green filter then a red filter and finally a

blue filter What color will the object seem to be

Summary

Why Objects Have Color

bull The color of an object is determined by the

wavelengths of light it reflects

bull The color of a filter is the color of the light the

filter transmits

Seeing Color

bull Rod and cone cells are light-sensitive cells

found in the retina of the human eye

bull Rod cells are sensitive to dim light Cone cells

enable colors to be seen

bull There are three types of cone cells One type

responds to red light another to green light

and another to blue light

Mixing Colors

bull Red green and blue are the primary light

colors Any color of light can be created by

mixing these primary light colors

bull Any pigment color can be formed by mixing

the primary pigment colorsmdashmagenta cyan

and yellow

6 Use Percentages In the human eye there are about

120000000 rods If 90000000 rods trigger at once

what percentage of the total number of rods triggered

7 Convert Units The wavelengths of light are measured

in nanometers (nm) which equals 0000001 mm

Find the wavelength in mm of a light wave that has a

wavelength of 690 nm

Mixing Pigments You can make any pigment color by mixingdifferent amounts of the three primary pigmentsmdashmagenta(bluish red) cyan (greenish blue) and yellow In fact color print-ers use these pigments as well as black ink to make full-colorprints like the pages in this book A primary pigmentrsquos colordepends on the wavelengths of the light that it reflects Actuallypigments both absorb and reflect a range of colors in sending asingle color message to your eye For example in white lightyellow pigment appears yellow because it reflects red and greenlight but absorbs the other wavelengths of visible light The colorof a mixture of two primary pigments is determined by theprimary colors of light that both pigments reflect

Look at Figure 29 The area in the center where the colors alloverlap appears to be black because the three blended primarypigments absorb all the primary colors of light Recall that theprimary colors of light combine to produce white light They arecalled additive colors However when the primary pigment col-ors are combined they absorb all wavelengths of visible light andproduce black Because black results from the absence ofreflected light the primary pigments are called subtractive colors

Figure 29 The three primary

pigment colors appear to be black

when they are mixed

Describe how the primary pigmentcolors are similar to the primary col-ors of light

More Section Review gpesciencecom

GPS+_343

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7230715

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Design Your OwnDesign Your Own

344

Real-World ProblemWhat loud noises do you enjoy and which ones do you find annoying

Most people enjoy a music concert performed by their favorite artist or

the booming displays of fireworks on the Fourth of July Most people

enjoy these loud sounds for short periods of time However certain

other loud noises such as traffic sirens and loud talking can be

annoying Constant annoying noises are called noise pollution What

can be done to reduce noise pollution What types of barriers will best

block out noise pollution

Form a HypothesisBased on your experiences with loud noises form a hypothesis that

predicts the effectiveness of different types of barriers at blocking out

noise pollution

Test Your HypothesisMake a Plan

1 Complete the safety form

2 Decide what type of barriers or materials you will test

3 Describe exactly how you will use these materials

Goals Design an experiment

that tests the effective-

ness of various types of

barriers and materials

for blocking out noise

pollution

Test different types of

materials and barriers

to determine the best

noise blocks

Possible Materialsradio CD player horn

drum or other loud

noise source

shrubs trees concrete

walls brick walls stone

walls wooden fences

parked cars or hanging

laundry

sound meter

meterstick or metric tape

measure

Blocking NfisePollution

4 Identify the controls and variables you will use in your

experiment

5 List the steps you will use and describe each step precisely

6 Prepare a data table in your Science Journal to record your

measurements

7 Organize the steps of your experiment in logical order

Follow Your Plan

1 Ask your teacher to approve your plan and data table before

you start

2 Conduct your experiment as planned

3 Test each barrier two or three times

4 Record the results from each test in your data table in your Science Journal

Analyze Your Data1 Identify the barriers that most effectively reduced noise pollution

2 Identify the barriers that least effectively reduced noise pollution

3 Compare the effective barriers and identify common characteristics that might

explain why they reduced noise pollution

4 Compare the natural barriers you tested with the artificial barriers Which type

of barrier best reduced noise pollution

5 Compare the different types of materials the barriers were made of Which

type of material best reduced noise pollution

Conclude and Apply1 Evaluate whether your results support your hypothesis

2 Predict how your results would differ if you used a louder source of noise such

as a siren

3 Infer from your results how people living near a

busy street could reduce noise pollution

4 Identify major sources of noise pollution in or

near your home How could they be reduced

5 Research how noise pollution can be

unhealthy

LAB 345

Draw a poster illustrating how builders and

landscapers could use certain materials to

better insulate a home or office from excess

noise pollution

346 CHAPTER 11 Sound and Light

A Haiku GardenThe Four Seasons in Poems and Prints

by Stephen Addiss with Fumiko and Akira Yamamoto

Respond to the Reading1 How do the illustrations help the reader

better understand the poems2 What do you think is meant by the

word lingering in the Haiku about springsunlight

3 Linking Science and Writing Writeone haiku about summer and anotherabout fall In one poem use color tohelp you describe the season In theother use light or some property oflight to help describe the season

Research has deter-mined that there is a

connection between color and mood Warmcolors have longer wavelengths and can bemore stimulating Cool colors which haveshorter wavelengths tend to have a calmingor soothing effect on people Light and colorhave long been used as literary symbols Doesthe use of color change what you imaginewhen you read the haiku

UnderstandingLiteratureJapanese Haiku A haiku is a verse thatconsists of three lines and 17 syllables inthe Japanese language The first and thirdlines have five syllables each and themiddle line has seven syllables Why isimagination important in reading haiku

Lingering

in every pool of watermdash

spring sunlightIssa

Withered by winter

the sound of the windmdash

one-color worldBasho

Sound

1 Sound waves are compressional waves thattravel only in matter

2 The speed of sound in a material dependson the type of material as well as itstemperature

3 Loudness depends on a sound waversquos inten-sity Pitch depends on a sound waversquosfrequency

4 Sound waves are used in echolocationsonar and medical imaging

Reflection and Refractionof Light

1 Light can be absorbed reflected or trans-mitted by a material

2 When light waves are reflected theyobey the law of reflectionmdashthe angle ofincidence equals the angle of reflection

3 A light wave is refracted or bent whenit changes speed as it travels at an anglefrom one material to another

Mirrors Lenses andthe Eye

1 Plane mirrors form upright virtual images

2 Images formed by concave mirrors andconvex lenses depend on the location ofthe object relative to the focal point

3 Convex mirrors and concave lenses formvirtual upright images that are smallerthan the object

4 The lens in the human eye changes shape toproduce a sharp image on the retina

Light and Color

1 You see color when light is reflected offobjects and into your eyes

2 Cone cells in the retina are light-sensitivecells that enable you to distinguish colors

3 Red blue and green are the three primarycolors of light and can be mixed to form allother colors

4 The primary pigment colors are magentacyan and yellow

CHAPTER STUDY GUIDE 347

Use the Foldable you made at the beginningof the chapter to help you review sound and light

Interactive Tutor gpesciencecom

Complete each statement with the correctvocabulary word or phrase

1 A change in frequency due to a movingsound source is due to the

2 A flat smooth surface that reflects light andforms an image is a(n)

3 An object is if you can seethrough it clearly

4 The of a material indicates howmuch the speed of light in the materialchanges as light passes through

5 You can change the color of white paint byadding a(n) to it

6 A(n) is a reflecting surface thatcurves outward like the back of a spoon

7 The human perception of the intensity of asound wave is

Choose the word or phrase that best answerseach question

8 Which of the following best describes imageformation by a plane mirrorA) A real image is formed in front of the mirrorB) A real image is formed behind the mirrorC) A virtual image is formed in front of the

mirrorD) A virtual image is formed behind the mirror

9 For a sound with low pitch what else isalso always lowA) amplitude C) wavelengthB) frequency D) wave velocity

10 Which of the following occurs when asound source moves away from youA) The soundrsquos velocity decreasesB) The soundrsquos loudness increasesC) The soundrsquos frequency decreasesD) The soundrsquos frequency increases

Use the table below to answer question 11

11 Based on the data in the table abovewhich of the following would be the speedof sound in air at 30degCA) 3404 ms C) 3494 msB) 3464 ms D) 3534 ms

12 What happens to a light ray travelingparallel to the optical axis of a convexlens that passes through the lensA) It travels parallel to the optical axisB) It passes through the focal pointC) It is bent away from the optical axisD) It forms a virtual image

13 Light waves of which color are bent mostwhen passing through a prismA) blue C) violetB) red D) yellow

14 Which way does a concave lens bend lightA) toward its optical axisB) toward its centerC) toward its edgesD) toward its focal point

Speed of Sound in Air

Temp peed( s)

4

4

4

348 CHAPTER REVIEW

concave lens p 335concave mirror p 332convex lens p 333convex mirror p 333decibel p 322Doppler effect p 323index of refraction p 329intensity p 322

loudness p 322opaque p 327pigment p 342pitch p 323plane mirror p 331translucent p 327transparent p 327

Vocabulary PuzzleMaker gpesciencecom

Use the illustration below to answer question 15

15 Describe how the position of the candlechanged if the image of the candle movedaway from the focal point

16 Apply Acoustic scientists sometimes doresearch in rooms that absorb all soundwaves How could such a room be used tostudy how bats find their food

17 Compare White light passes through atranslucent pane of glass and shines on ashirt Both the translucent glass and theshirt appear green Compare the colors oflight that are absorbed and transmitted bythe glass and the shirt

18 Infer Most mammals including dogs andcats canrsquot see colors Infer how the retinaof a catrsquos eye might be different from theretina of a human eye

19 Determine whether a convex lens could forman image that is enlarged real and upright

20 Infer A car comes to a railroad crossingThe driver hears a trainrsquos whistle and itspitch becomes lower What can beassumed about how the train is moving

21 Compare and contrast the reflection of lightfrom a white wall with a rough surfacewith the reflection of light from a mirror

Optical axis

One

focal

length

Two

focal

lengths

Image

Ray A

Object

Focal

point

Interpreting Graphics 22 Infer why a convex mirror and a concavelens can never produce a real image

23 Predict what color a white shirt wouldappear to be if the light reflected from theshirt passed through a red filter and thenthrough a green filter

24 Explain why windows might begin to rattlewhen an airplane flies overhead

25 Communicate Some people enjoy usingsnowmobiles Others object to the noisethat they make Write a proposal for a pol-icy that seems fair to both groups for theuse of snowmobiles in a state park

CHAPTER REVIEW 349

Use the wave speed equation ν ƒλ to answer

questions 26 and 27

26 Calculate Frequency A sonar pulse has awavelength of 30 cm and a speed inwater of 1500 ms Find its frequency

27 Calculate Wavelength What is the wave-length of a sound wave with a fre-quency of 440 Hz if the speed of soundin air is 340 ms

28 Calculate Angle of Incidence A light ray isreflected from a mirror If the anglebetween the incident ray and thereflected ray is 136deg what is the angleof incidence

29 Determine Object Distance You hold anobject in front of a concave mirror witha focal length of 30 cm If you do notsee a reflected image how far from themirror is the object

30 Calculate Speed The speed of light in avacuum is 300000 kms If the index ofrefraction of water is 133 what is thespeed of light in water

More Chapter Review gpesciencecom

1 Which of the following describes the imageformed by a convex mirror

A enlarged

B inverted

C real

D virtual

Use the figure below to answer question 2

2 Which of the following describes a light raythat passes through the focal point andthen is reflected by the mirror

A It travels parallel to the optical axis

B It forms a real image

C It is reflected back through the focal point

D It forms a virtual image

3 Why does an apple look red

A It reflects red light

B It absorbs red light

C It reflects green and blue light

D It reflects all colors of light except red

Use the figure below to answer questions 4 and 5

4 When the primary colors of light are addedtogether what color appears in area H

A cyan

B magenta

C white

D yellow

5 When the primary colors of light are addedtogether what color appears in area G

A cyan

B magenta

C white

D yellow

6 Which of the following increases as the fre-quency of a sound increases

A amplitude

B intensity

C loudness

D pitch

Red Blue

Green

F

H

G K

Focal pointOptical axis

350 STANDARDIZED TEST PRACTICE

Record your answers on the answer sheet provided by your teacher or on a sheet of paper

STANDARDIZED TEST PRACTICE 351

7 Which of the following parts of the eyeenable you to see colors in bright light

A cone cells

B cornea

C lens

D rod cells

Use the graph below to answer questions 8 and 9

8 Determine how far in centimeters theimage is from the lens when the object is15 centimeters from the lens

9 How far in centimeters is the object fromthe lens when the image distance andobject distance are equal

10 A shirt has stripes that are black and whitein white light If green light shines on thisshirt what colors will the black and whitestripes be

11 If you are on a moving train what hap-pens to the pitch of a crossing bell as youapproach the crossing and then moveaway from the crossing

Use the figure below to answer question 12

12 Describe the vision problem show by thefigure and explain how this vision prob-lem can be corrected

13 Explain why the human eye can see colorsbetter in bright light than in dim light

Image Distance fora Convex Lens

Ima

ge

dis

tan

ce (

cm)

30

25

20

15

10

5 10 15 20 25 30

Object distance (cm)

Standardized Test Practice gpesciencecom

Note Units Read carefully and make note of the units used in

any measurement

  • Glencoe Physical Science with Earth Science
    • Student Edition Table of Contents
      • Unit 1 Science and Technology
        • Chapter 1 The Nature of Science
          • Launch Lab Understanding Measurements
          • Foldables
          • Section 1 The Methods of Science
            • Science Online
            • Integrate History
            • Integrate Earth Science
            • Science Online
              • Section 2 Standards of Measurement
                • Applying Math Centimeters
                • Integrate Earth Science
                • Science Online
                • MiniLAB Determining the Density of a Pencil
                • Visualizing SI Dimensions
                  • Section 3 Communicating with Graphs
                    • Applying Math Temperature
                    • MiniLAB Graphing Temperature Change
                    • Lab Whats my graph
                    • Lab Design Your Own - Developing a Measurement System
                    • Science and Language Arts Thinking in Pictures and Other Reports from My Life with Autism
                      • Chapter 1 Study Guide
                      • Chapter 1 Review
                      • Chapter 1 Standardized Test Practice
                        • Chapter 2 Science Technology and Society
                          • Lab Technology in Your Life
                          • Foldables
                          • Section 1 Science and Technology
                            • MiniLAB Researching the Past
                            • Visualizing Technology Supplying Basic Needs
                            • Science Online
                              • Section 2 Forces that Shape Technology
                                • MiniLAB Evaluating the Benefits and Consequences of Technology
                                • Integrate Environment
                                • Integrate History
                                • Applying Science What impact does the accident at Chernobyl have on the future of nuclear power
                                • Science Online
                                • Lab Who contributes CO2
                                  • Section 3 Developing Technology
                                    • Integrate Life Science
                                    • Integrate Career
                                    • Lab Model and Invent - Care Package
                                    • Oops Accidents in Science A Slippery Situation
                                      • Chapter 2 Study Guide
                                      • Chapter 2 Review
                                      • Chapter 2 Standardized Test Practice
                                          • Unit 2 Motion Forces and Energy
                                            • Chapter 3 Motion Acceleration and Forces
                                              • Launch Lab Compare Speeds
                                              • Foldables
                                              • Section 1 Describing Motion
                                                • MiniLAB Measuring Average Speed
                                                • Science Online
                                                • Applying Math Average Speed
                                                • Integrate Astronomy
                                                • Science Online
                                                  • Section 2 Acceleration
                                                    • Integrate History
                                                    • Visualizing Acceleration
                                                      • Section 3 Motion and Forces
                                                        • Science Online
                                                        • MiniLAB Comparing Friction
                                                        • Lab Force and Acceleration
                                                        • Lab Design Your Own - Comparing Motion from Different Forces
                                                        • Science and Language Arts A Brave and Startling Truth
                                                          • Chapter 3 Study Guide
                                                          • Chapter 3 Review
                                                          • Chapter 3 Standardized Test Practice
                                                            • Chapter 4 The Laws of Motion
                                                              • Launch Lab The Force of Gravity
                                                              • Foldables
                                                              • Section 1 The First Two Laws of Motion
                                                                • MiniLAB Observing Inertia
                                                                • Science Online
                                                                • Applying Math The Acceleration of a Sled Solve a Simple Equation
                                                                  • Section 2 Gravity
                                                                    • Science Online
                                                                    • Integrate Earth Science
                                                                    • MiniLAB Observing Centripetal Force
                                                                    • Lab Gravity and Air Resistance
                                                                      • Section 3 The Third Law of Motion
                                                                        • Integrate Career
                                                                        • Visualizing Rocket Motion
                                                                        • Applying Math The Momentum of a Sprinter
                                                                        • Lab The Momentum of Colliding Objects
                                                                        • Science and History Newton and the Plague
                                                                          • Chapter 4 Study Guide
                                                                          • Chapter 4 Review
                                                                          • Chapter 4 Standardized Test Practice
                                                                            • Chapter 5 Energy
                                                                              • Launch Lab Energy Conversions
                                                                              • Foldables
                                                                              • Section 1 The Nature of Energy
                                                                                • Science Online
                                                                                • Applying Math Kinetic Energy
                                                                                • MiniLAB Interpreting Data from a Slingshot
                                                                                • Integrate Language Arts
                                                                                • Applying Math Gravitational Potential Energy
                                                                                • Lab Bouncing Balls
                                                                                  • Section 2 Conservation of Energy
                                                                                    • Visualizing Energy Transformations
                                                                                    • Integrate Environment
                                                                                    • MiniLAB Transforming Energy in a Paper Clip
                                                                                    • Science Online
                                                                                    • Integrate Health
                                                                                    • Lab Design Your Own - Swinging Energy
                                                                                    • Science and History The Impossible Dream
                                                                                      • Chapter 5 Study Guide
                                                                                      • Chapter 5 Review
                                                                                      • Chapter 5 Standardized Test Practice
                                                                                        • Chapter 6 Work and Machines
                                                                                          • Launch Lab Doing Work with a Simple Machine
                                                                                          • Foldables
                                                                                          • Section 1 Work
                                                                                            • Integrate Language Arts
                                                                                            • Applying Math Work
                                                                                            • MiniLAB Calculating Your Work and Power
                                                                                            • Applying Math Power
                                                                                              • Section 2 Using Machines
                                                                                                • MiniLAB Machines Multiplying Force
                                                                                                • Science Online
                                                                                                • Integrate Chemistry
                                                                                                  • Section 3 Simple Machines
                                                                                                    • Integrate History
                                                                                                    • Visualizing Levers in the Human Body
                                                                                                    • Science Online
                                                                                                    • Lab Levers
                                                                                                    • Lab Model and Invent - Using Simple Machines
                                                                                                    • Science and Society The Science of Very Very Small
                                                                                                      • Chapter 6 Study Guide
                                                                                                      • Chapter 6 Review
                                                                                                      • Chapter 6 Standardized Test Practice
                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                          • Launch Lab Relative Sizes of Earth the Moon and the Sun
                                                                                                          • Foldables
                                                                                                          • Section 1 Earth in Space
                                                                                                            • Science Online
                                                                                                            • Integrate Physics
                                                                                                              • Section 2 Time and Seasons
                                                                                                                • MiniLAB Modeling the Suns Rays at Solstice
                                                                                                                • Lab Comparing the Angle of Sunlight to Intensity
                                                                                                                  • Section 3 Earths Moon
                                                                                                                    • Applying Math Tides
                                                                                                                    • MiniLAB Modeling Phases and Eclipses
                                                                                                                    • Integrate History
                                                                                                                    • Integrate History
                                                                                                                    • Science Online
                                                                                                                    • Visualizing Water on the Moon
                                                                                                                    • Lab Identifying the Moons Surface Features and Apollo Landing Sites
                                                                                                                    • Oops Accidents in Science Even Great Scientists Make Mistakes
                                                                                                                      • Chapter 7 Study Guide
                                                                                                                      • Chapter 7 Review
                                                                                                                      • Chapter 7 Standardized Test Practice
                                                                                                                        • Chapter 8 The Solar System
                                                                                                                          • Launch Lab The Size of the Solar System
                                                                                                                          • Foldables
                                                                                                                          • Section 1 Planet Motion
                                                                                                                            • Integrate History
                                                                                                                            • MiniLAB Plotting Retrograde Motion
                                                                                                                            • Integrate Physics
                                                                                                                            • Applying Math Heliocentric Longitude (HL)
                                                                                                                              • Section 2 The Inner Planets
                                                                                                                                • Science Online
                                                                                                                                • Integrate Chemistry
                                                                                                                                • Lab Interpreting Features of Marss Surface
                                                                                                                                  • Section 3 The Outer Planets
                                                                                                                                    • Integrate Language Arts
                                                                                                                                    • Visualizing What Galileo Saw
                                                                                                                                    • Science Online
                                                                                                                                    • MiniLAB Comparing Sizes of Outer and Inner Planets
                                                                                                                                      • Section 4 Life in the Solar System
                                                                                                                                        • Lab Design Your Own - Testing Unknown Soil Samples for Life
                                                                                                                                        • Science Stats Night Sky Wonders
                                                                                                                                          • Chapter 8 Study Guide
                                                                                                                                          • Chapter 8 Review
                                                                                                                                          • Chapter 8 Standardized Test Practice
                                                                                                                                              • Unit 3 Energy in Motion
                                                                                                                                                • Chapter 9 Heat and States of Matter
                                                                                                                                                  • Launch Lab Expansion of a Gas
                                                                                                                                                  • Foldables
                                                                                                                                                  • Section 1 Temperature and Thermal Energy
                                                                                                                                                    • Applying Math Converting to Celsius
                                                                                                                                                    • Science Online
                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                    • Applying Math Change in Thermal Energy
                                                                                                                                                      • Section 2 States of Matter
                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                        • Science Online
                                                                                                                                                        • MiniLAB Comparing States of Water
                                                                                                                                                          • Section 3 Transferring Thermal Energy
                                                                                                                                                            • MiniLAB Comparing Thermal Conductors
                                                                                                                                                            • Visualizing Convection Currents
                                                                                                                                                            • Lab Convection in Gases and Liquids
                                                                                                                                                              • Section 4 Using Thermal Energy
                                                                                                                                                                • Integrate History
                                                                                                                                                                • Science Online
                                                                                                                                                                • Lab Conduction in Gases
                                                                                                                                                                • Science Stats Surprising Thermal Energy
                                                                                                                                                                  • Chapter 9 Study Guide
                                                                                                                                                                  • Chapter 9 Review
                                                                                                                                                                  • Chapter 9 Standardized Test Practice
                                                                                                                                                                    • Chapter 10 Waves
                                                                                                                                                                      • Launch Lab How do waves transfer energy
                                                                                                                                                                      • Foldables
                                                                                                                                                                      • Section 1 The Nature of Waves
                                                                                                                                                                        • Visualizing Formation of Ocean Waves
                                                                                                                                                                        • Science Online
                                                                                                                                                                          • Section 2 Wave Properties
                                                                                                                                                                            • MiniLAB Observing Wavelength
                                                                                                                                                                            • Integrate Social Studies
                                                                                                                                                                            • Applying Math The Speed of Sound
                                                                                                                                                                            • Lab Wave Speed and Tension
                                                                                                                                                                              • Section 3 The Behavior of Waves
                                                                                                                                                                                • Science Online
                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                • MiniLAB Experimenting with Resonance
                                                                                                                                                                                • Lab Measuring Wave Properties
                                                                                                                                                                                • Science and History Making Waves
                                                                                                                                                                                  • Chapter 10 Study Guide
                                                                                                                                                                                  • Chapter 10 Review
                                                                                                                                                                                  • Chapter 10 Standardized Test Practice
                                                                                                                                                                                    • Chapter 11 Sound and Light
                                                                                                                                                                                      • Launch Lab What sound does a ruler make
                                                                                                                                                                                      • Foldables
                                                                                                                                                                                      • Section 1 Sound
                                                                                                                                                                                        • MiniLAB Comparing Intensity
                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                        • Science Online
                                                                                                                                                                                        • Applying Math Using Sonar
                                                                                                                                                                                          • Section 2 Reflection and Refraction of Light
                                                                                                                                                                                          • Section 3 Mirrors Lenses and the Eye
                                                                                                                                                                                            • Visualizing Images Formed by a Convex Lens
                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                            • MiniLAB Experimenting with Focal Lengths
                                                                                                                                                                                            • Lab Reflections of Reflections
                                                                                                                                                                                              • Section 4 Light and Color
                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Lab Design Your Own - Blocking Noise Pollution
                                                                                                                                                                                                • Science and Language Arts A Haiku Garden The Four Seasons in Poems and Print
                                                                                                                                                                                                  • Chapter 11 Study Guide
                                                                                                                                                                                                  • Chapter 11 Review
                                                                                                                                                                                                  • Chapter 11 Standardized Test Practice
                                                                                                                                                                                                    • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                      • Launch Lab Global Jigsaw Puzzle
                                                                                                                                                                                                      • Foldables
                                                                                                                                                                                                      • Section 1 Evolution of Earths Crust
                                                                                                                                                                                                        • Applying Math Spreading Distances
                                                                                                                                                                                                        • Integrate Physics
                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                          • Section 2 Earthquakes
                                                                                                                                                                                                            • MiniLAB Demonstrating Four Types of Stress
                                                                                                                                                                                                            • Visualizing Earthquake-Proof Buildings
                                                                                                                                                                                                              • Section 3 Earths Interior
                                                                                                                                                                                                              • Section 4 Volcanoes
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • MiniLAB Modeling Lava Viscosity
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                • Lab A Case for Pacific Plate Motion
                                                                                                                                                                                                                • Lab Earthquake Earthquake Wheres the earthquake
                                                                                                                                                                                                                • Science and History Volcano Weather
                                                                                                                                                                                                                  • Chapter 12 Study Guide
                                                                                                                                                                                                                  • Chapter 12 Review
                                                                                                                                                                                                                  • Chapter 12 Standardized Test Practice
                                                                                                                                                                                                                      • Unit 4 Forms of Energy
                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                          • Launch Lab Electric Circuits
                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                          • Section 1 Electric Charge
                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                            • Visualizing Lightning
                                                                                                                                                                                                                            • MiniLAB Investigate Charged Objects
                                                                                                                                                                                                                              • Section 2 Electric Current
                                                                                                                                                                                                                                • MiniLAB Investigating Battery Addition
                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                • Lab Identifying Conductors and Insulators
                                                                                                                                                                                                                                  • Section 3 Electrical Energy
                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                    • Applying Math Power Used by a Clothes Dryer
                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                    • Applying Math Electrical Energy Used by a Microwave Oven
                                                                                                                                                                                                                                    • Lab Design Your Own - Comparing Series and Parallel Circuits
                                                                                                                                                                                                                                    • Science and Language Arts Invisible Man
                                                                                                                                                                                                                                      • Chapter 13 Study Guide
                                                                                                                                                                                                                                      • Chapter 13 Review
                                                                                                                                                                                                                                      • Chapter 13 Standardized Test Practice
                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                          • Launch Lab The Strength of Magnets
                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                          • Section 1 Magnetism
                                                                                                                                                                                                                                            • MiniLAB Observing Magnetic Interference
                                                                                                                                                                                                                                            • Integrate Earth Science
                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                            • Applying Science How can magnetic parts of a junk car be salvaged
                                                                                                                                                                                                                                            • MiniLAB Making Your Own Compass
                                                                                                                                                                                                                                              • Section 2 Electricity and Magnetism
                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                  • Section 3 Producing Electric Current
                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                    • Visualizing Motors and Generators
                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                    • Lab Electricity and Magnetism
                                                                                                                                                                                                                                                    • Lab Design Your Own - Controlling Electromagnets
                                                                                                                                                                                                                                                    • Science and History Body Art
                                                                                                                                                                                                                                                      • Chapter 14 Study Guide
                                                                                                                                                                                                                                                      • Chapter 14 Review
                                                                                                                                                                                                                                                      • Chapter 14 Standardized Test Practice
                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                          • Launch Lab Can electromagnetic waves change materials
                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                          • Section 1 What are electromagnetic waves
                                                                                                                                                                                                                                                            • MiniLAB Investigating Electromagnetic Waves
                                                                                                                                                                                                                                                            • Applying Math The Speed of Light in Water
                                                                                                                                                                                                                                                              • Section 2 The Electromagnetic Spectrum
                                                                                                                                                                                                                                                                • MiniLAB Heating with Microwaves
                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                • Lab The Shape of Satellite Dishes
                                                                                                                                                                                                                                                                  • Section 3 Radio Communication
                                                                                                                                                                                                                                                                    • Visualizing Radio Broadcasts
                                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Lab Use the Internet - Radio Frequencies
                                                                                                                                                                                                                                                                    • Science and History Riding a Beam of Light
                                                                                                                                                                                                                                                                      • Chapter 15 Study Guide
                                                                                                                                                                                                                                                                      • Chapter 15 Review
                                                                                                                                                                                                                                                                      • Chapter 15 Standardized Test Practice
                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                          • Launch Lab Heating with Solar Energy
                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                          • Section 1 Fossil Fuels
                                                                                                                                                                                                                                                                            • Visualizing The Formation of Fossil Fuels
                                                                                                                                                                                                                                                                            • MiniLAB Designing an Efficient Water Heater
                                                                                                                                                                                                                                                                              • Section 2 Nuclear Energy
                                                                                                                                                                                                                                                                                • Integrate Earth Science
                                                                                                                                                                                                                                                                                • Integrate Social Science
                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                • Applying Science Can a contaminated radioactive site be reclaimed
                                                                                                                                                                                                                                                                                  • Section 3 Renewable Energy Sources
                                                                                                                                                                                                                                                                                    • MiniLAB Using Solar Power at Home
                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                    • Lab Solar Heating
                                                                                                                                                                                                                                                                                    • Lab Use the Internet How much does energy really cost
                                                                                                                                                                                                                                                                                    • Science and Society Reacting to Nuclear Energy
                                                                                                                                                                                                                                                                                      • Chapter 16 Study Guide
                                                                                                                                                                                                                                                                                      • Chapter 16 Review
                                                                                                                                                                                                                                                                                      • Chapter 16 Standardized Test Practice
                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                          • Lab Atmospheric Pressure
                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                          • Section 1 Earths Atmosphere
                                                                                                                                                                                                                                                                                            • MiniLAB Visualizing Convection
                                                                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                                                                            • Lab Visualizing a Temperature Inversion
                                                                                                                                                                                                                                                                                              • Section 2 Weather
                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Coriolis Effect
                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                  • Section 3 Climate
                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                    • Visualizing Earths Biogeophysical System
                                                                                                                                                                                                                                                                                                      • Section 4 Earths Changing Climates
                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                        • Applying Math Carbon Dioxide (CO2) Concentration
                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Investigating Microclimate
                                                                                                                                                                                                                                                                                                        • Science and Language Arts The Grapes of Wrath
                                                                                                                                                                                                                                                                                                          • Chapter 17 Study Guide
                                                                                                                                                                                                                                                                                                          • Chapter 17 Review
                                                                                                                                                                                                                                                                                                          • Chapter 17 Standardized Test Practice
                                                                                                                                                                                                                                                                                                              • Unit 5 Matter and Earth Materials
                                                                                                                                                                                                                                                                                                                • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                  • Launch Lab Demonstrate the Distillation of Water
                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                  • Section 1 Composition of Matter
                                                                                                                                                                                                                                                                                                                    • Visualizing Elements
                                                                                                                                                                                                                                                                                                                    • MiniLAB Classifying Materials
                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                    • Lab Comparing Pure Substances and Mixtures
                                                                                                                                                                                                                                                                                                                      • Section 2 Properties of Matter
                                                                                                                                                                                                                                                                                                                        • Integrate Environment
                                                                                                                                                                                                                                                                                                                        • MiniLAB Separating Ink
                                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                                        • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                        • Applying Math The Law of Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Measuring the Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Science Stats Intriguing Elements
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Study Guide
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Review
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                            • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                              • Launch Lab Inferring What You Cant Observe
                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                              • Section 1 Structure of the Atom
                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling an Aluminum Atom
                                                                                                                                                                                                                                                                                                                                • Visualizing The Atomic Model
                                                                                                                                                                                                                                                                                                                                  • Section 2 Masses of Atoms
                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                    • Applying Science How can radioactive isotopes help tell time
                                                                                                                                                                                                                                                                                                                                      • Section 3 The Periodic Table
                                                                                                                                                                                                                                                                                                                                        • MiniLAB Organizing a Personal Periodic Table
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Career
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                                                                                                                                                                        • Lab A Periodic Table of Foods
                                                                                                                                                                                                                                                                                                                                        • Lab Use the Internet Whats in a name
                                                                                                                                                                                                                                                                                                                                        • Science and History A Chilling Story
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Study Guide
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Review
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                            • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                              • Launch Lab Earth Materials at Home and School
                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                              • Section 1 Minerals
                                                                                                                                                                                                                                                                                                                                                • MiniLAB Identifying Salts Crystal System
                                                                                                                                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                • Lab Be a Mineral Detective
                                                                                                                                                                                                                                                                                                                                                  • Section 2 Igneous Rocks
                                                                                                                                                                                                                                                                                                                                                    • Applying Math Extrusive Igneous Rock Classification
                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                      • Section 3 Sedimentary Rocks
                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Evaporites
                                                                                                                                                                                                                                                                                                                                                          • Section 4 Metamorphic Rocks and the Rock Cycle
                                                                                                                                                                                                                                                                                                                                                            • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                            • Visualizing Shock Metamorphic Rock
                                                                                                                                                                                                                                                                                                                                                            • Lab Identifying Rocks
                                                                                                                                                                                                                                                                                                                                                            • Science and Society Earth Materials at Work
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Study Guide
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Review
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                  • Launch Lab Have you got the time
                                                                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                                                                  • Section 1 Weathering and Soil
                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing a Disappearing Seasoning
                                                                                                                                                                                                                                                                                                                                                                    • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                    • Lab Graphing Soil Textures
                                                                                                                                                                                                                                                                                                                                                                      • Section 2 Shaping the Landscape
                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Runoff
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                          • Section 3 Groundwater
                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Porosity Volume
                                                                                                                                                                                                                                                                                                                                                                            • Visualizing The Role of Groundwater in Shaping Earths Surface
                                                                                                                                                                                                                                                                                                                                                                            • Integrate Environment
                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                              • Section 4 Geologic Time
                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                                                                                                • Lab Its about time - relative that is
                                                                                                                                                                                                                                                                                                                                                                                • Science and Society Tapping into the Underground
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Review
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                      • Unit 6 Interactions of Matter
                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                          • Lab Chemical Bonds and Mixing
                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Stability in Bonding
                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                            • Lab Atomic Trading Cards
                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Types of Bonds
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Observing a Bond Type
                                                                                                                                                                                                                                                                                                                                                                                                • Visualizing Polar Molecules
                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Writing Formulas and Naming Compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math Determining a Formula
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Science Can you name binary ionic compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Making a Hydrate
                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Model and Invent - Modeling Chemical Bonding
                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Sticky Subject
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Review
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab RustingmdashA Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Chemical Changes
                                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Designing a Team Equation
                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Chemical Equations
                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math Barium Sulfate Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Classifying Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 4 Reaction Rates and Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing Chemical Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Creating a Colorful Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab To Glow or Not to Glow
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Investigating Reaction Conditions
                                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Clumsy Move Pays Off
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Review
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab Magic Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 How Solutions Form
                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                                                                                                                                                                                                                                                            • Visualizing Metal Alloys
                                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Observing the Effect of Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Solubility and Concentration
                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Acids Bases and Salts
                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing Acid Relief
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Strength of Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Determining Acidity
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Saturated Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and Society Acid Rain
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab The Size of a Nucleus
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Strong Force
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Nuclear Decay
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Detecting Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math The Age of Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Social Studies
                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Nuclear Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling a Nuclear Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Visualizing PET Scans
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Chain Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Model and Invent Modeling Transmutations
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and History The Nuclear Alchemist
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 26 Stars and Galaxies
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab Stars in the Sky
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Observing the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling a Telescope
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math The Magnifying Power of Telescopes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Evolution of Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Counting Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing H-R Diagrams of Star Clusters
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Star Cluster Age
                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 3 Galaxies and the Milky Way
                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 4 Cosmology
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Lab Model and Invent - Expansion of the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Science and Language Arts Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Student Resources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Skill Handbook
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Scientific Methods
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Safety Symbols
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Safety in the Science Laboratory
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Math Skill Handbook
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Math Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Science Applications
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Formulas
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Extra Math Problems
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Reference Handbook
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Minerals
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Physical Science Reference Tables
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Periodic Table of the Elements
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Weather Map Symbols
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                • EnglishSpanish Glossary
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Index
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Credits
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Students Workbooks
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter Resources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 1 The Nature of Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 2 Science Technology and Society
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 3 Motion Acceleration and Forces
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 4 The Laws of Motion
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 5 Energy
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 6 Work and Machines
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 8 The Solar System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 9 Heat and States of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 10 Waves
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 11 Sound and Light
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 26 Stars and Galaxies
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Additional Resources
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Page 26: 706 S1 318-326 GPS09 - Light-and-Sound - home · PDF fileWhat sound does a ruler make? ... sound waves cannot travel in empty space where there are no particles. ... sound travels

SECTION 4 Light and Color 343

Self Check

1 Identity what colors are reflected and what colors are

absorbed if a white light shines on a red shirt

2 Discuss how the primary colors of light differ from the

primary pigment colors

3 Explain why a red apple would appear black if you

looked at it through a blue filter

4 Determine why a white fence appears to be white instead

of multicolored if all colors are present in white light

5 Think Critically Light reflected from an object passes

through a green filter then a red filter and finally a

blue filter What color will the object seem to be

Summary

Why Objects Have Color

bull The color of an object is determined by the

wavelengths of light it reflects

bull The color of a filter is the color of the light the

filter transmits

Seeing Color

bull Rod and cone cells are light-sensitive cells

found in the retina of the human eye

bull Rod cells are sensitive to dim light Cone cells

enable colors to be seen

bull There are three types of cone cells One type

responds to red light another to green light

and another to blue light

Mixing Colors

bull Red green and blue are the primary light

colors Any color of light can be created by

mixing these primary light colors

bull Any pigment color can be formed by mixing

the primary pigment colorsmdashmagenta cyan

and yellow

6 Use Percentages In the human eye there are about

120000000 rods If 90000000 rods trigger at once

what percentage of the total number of rods triggered

7 Convert Units The wavelengths of light are measured

in nanometers (nm) which equals 0000001 mm

Find the wavelength in mm of a light wave that has a

wavelength of 690 nm

Mixing Pigments You can make any pigment color by mixingdifferent amounts of the three primary pigmentsmdashmagenta(bluish red) cyan (greenish blue) and yellow In fact color print-ers use these pigments as well as black ink to make full-colorprints like the pages in this book A primary pigmentrsquos colordepends on the wavelengths of the light that it reflects Actuallypigments both absorb and reflect a range of colors in sending asingle color message to your eye For example in white lightyellow pigment appears yellow because it reflects red and greenlight but absorbs the other wavelengths of visible light The colorof a mixture of two primary pigments is determined by theprimary colors of light that both pigments reflect

Look at Figure 29 The area in the center where the colors alloverlap appears to be black because the three blended primarypigments absorb all the primary colors of light Recall that theprimary colors of light combine to produce white light They arecalled additive colors However when the primary pigment col-ors are combined they absorb all wavelengths of visible light andproduce black Because black results from the absence ofreflected light the primary pigments are called subtractive colors

Figure 29 The three primary

pigment colors appear to be black

when they are mixed

Describe how the primary pigmentcolors are similar to the primary col-ors of light

More Section Review gpesciencecom

GPS+_343

null

7230715

eng - iTunNORM 000002A9 00000000 00001B2C 00000000 0000E3C1 00000000 00006099 00000000 00004705 00000000

Design Your OwnDesign Your Own

344

Real-World ProblemWhat loud noises do you enjoy and which ones do you find annoying

Most people enjoy a music concert performed by their favorite artist or

the booming displays of fireworks on the Fourth of July Most people

enjoy these loud sounds for short periods of time However certain

other loud noises such as traffic sirens and loud talking can be

annoying Constant annoying noises are called noise pollution What

can be done to reduce noise pollution What types of barriers will best

block out noise pollution

Form a HypothesisBased on your experiences with loud noises form a hypothesis that

predicts the effectiveness of different types of barriers at blocking out

noise pollution

Test Your HypothesisMake a Plan

1 Complete the safety form

2 Decide what type of barriers or materials you will test

3 Describe exactly how you will use these materials

Goals Design an experiment

that tests the effective-

ness of various types of

barriers and materials

for blocking out noise

pollution

Test different types of

materials and barriers

to determine the best

noise blocks

Possible Materialsradio CD player horn

drum or other loud

noise source

shrubs trees concrete

walls brick walls stone

walls wooden fences

parked cars or hanging

laundry

sound meter

meterstick or metric tape

measure

Blocking NfisePollution

4 Identify the controls and variables you will use in your

experiment

5 List the steps you will use and describe each step precisely

6 Prepare a data table in your Science Journal to record your

measurements

7 Organize the steps of your experiment in logical order

Follow Your Plan

1 Ask your teacher to approve your plan and data table before

you start

2 Conduct your experiment as planned

3 Test each barrier two or three times

4 Record the results from each test in your data table in your Science Journal

Analyze Your Data1 Identify the barriers that most effectively reduced noise pollution

2 Identify the barriers that least effectively reduced noise pollution

3 Compare the effective barriers and identify common characteristics that might

explain why they reduced noise pollution

4 Compare the natural barriers you tested with the artificial barriers Which type

of barrier best reduced noise pollution

5 Compare the different types of materials the barriers were made of Which

type of material best reduced noise pollution

Conclude and Apply1 Evaluate whether your results support your hypothesis

2 Predict how your results would differ if you used a louder source of noise such

as a siren

3 Infer from your results how people living near a

busy street could reduce noise pollution

4 Identify major sources of noise pollution in or

near your home How could they be reduced

5 Research how noise pollution can be

unhealthy

LAB 345

Draw a poster illustrating how builders and

landscapers could use certain materials to

better insulate a home or office from excess

noise pollution

346 CHAPTER 11 Sound and Light

A Haiku GardenThe Four Seasons in Poems and Prints

by Stephen Addiss with Fumiko and Akira Yamamoto

Respond to the Reading1 How do the illustrations help the reader

better understand the poems2 What do you think is meant by the

word lingering in the Haiku about springsunlight

3 Linking Science and Writing Writeone haiku about summer and anotherabout fall In one poem use color tohelp you describe the season In theother use light or some property oflight to help describe the season

Research has deter-mined that there is a

connection between color and mood Warmcolors have longer wavelengths and can bemore stimulating Cool colors which haveshorter wavelengths tend to have a calmingor soothing effect on people Light and colorhave long been used as literary symbols Doesthe use of color change what you imaginewhen you read the haiku

UnderstandingLiteratureJapanese Haiku A haiku is a verse thatconsists of three lines and 17 syllables inthe Japanese language The first and thirdlines have five syllables each and themiddle line has seven syllables Why isimagination important in reading haiku

Lingering

in every pool of watermdash

spring sunlightIssa

Withered by winter

the sound of the windmdash

one-color worldBasho

Sound

1 Sound waves are compressional waves thattravel only in matter

2 The speed of sound in a material dependson the type of material as well as itstemperature

3 Loudness depends on a sound waversquos inten-sity Pitch depends on a sound waversquosfrequency

4 Sound waves are used in echolocationsonar and medical imaging

Reflection and Refractionof Light

1 Light can be absorbed reflected or trans-mitted by a material

2 When light waves are reflected theyobey the law of reflectionmdashthe angle ofincidence equals the angle of reflection

3 A light wave is refracted or bent whenit changes speed as it travels at an anglefrom one material to another

Mirrors Lenses andthe Eye

1 Plane mirrors form upright virtual images

2 Images formed by concave mirrors andconvex lenses depend on the location ofthe object relative to the focal point

3 Convex mirrors and concave lenses formvirtual upright images that are smallerthan the object

4 The lens in the human eye changes shape toproduce a sharp image on the retina

Light and Color

1 You see color when light is reflected offobjects and into your eyes

2 Cone cells in the retina are light-sensitivecells that enable you to distinguish colors

3 Red blue and green are the three primarycolors of light and can be mixed to form allother colors

4 The primary pigment colors are magentacyan and yellow

CHAPTER STUDY GUIDE 347

Use the Foldable you made at the beginningof the chapter to help you review sound and light

Interactive Tutor gpesciencecom

Complete each statement with the correctvocabulary word or phrase

1 A change in frequency due to a movingsound source is due to the

2 A flat smooth surface that reflects light andforms an image is a(n)

3 An object is if you can seethrough it clearly

4 The of a material indicates howmuch the speed of light in the materialchanges as light passes through

5 You can change the color of white paint byadding a(n) to it

6 A(n) is a reflecting surface thatcurves outward like the back of a spoon

7 The human perception of the intensity of asound wave is

Choose the word or phrase that best answerseach question

8 Which of the following best describes imageformation by a plane mirrorA) A real image is formed in front of the mirrorB) A real image is formed behind the mirrorC) A virtual image is formed in front of the

mirrorD) A virtual image is formed behind the mirror

9 For a sound with low pitch what else isalso always lowA) amplitude C) wavelengthB) frequency D) wave velocity

10 Which of the following occurs when asound source moves away from youA) The soundrsquos velocity decreasesB) The soundrsquos loudness increasesC) The soundrsquos frequency decreasesD) The soundrsquos frequency increases

Use the table below to answer question 11

11 Based on the data in the table abovewhich of the following would be the speedof sound in air at 30degCA) 3404 ms C) 3494 msB) 3464 ms D) 3534 ms

12 What happens to a light ray travelingparallel to the optical axis of a convexlens that passes through the lensA) It travels parallel to the optical axisB) It passes through the focal pointC) It is bent away from the optical axisD) It forms a virtual image

13 Light waves of which color are bent mostwhen passing through a prismA) blue C) violetB) red D) yellow

14 Which way does a concave lens bend lightA) toward its optical axisB) toward its centerC) toward its edgesD) toward its focal point

Speed of Sound in Air

Temp peed( s)

4

4

4

348 CHAPTER REVIEW

concave lens p 335concave mirror p 332convex lens p 333convex mirror p 333decibel p 322Doppler effect p 323index of refraction p 329intensity p 322

loudness p 322opaque p 327pigment p 342pitch p 323plane mirror p 331translucent p 327transparent p 327

Vocabulary PuzzleMaker gpesciencecom

Use the illustration below to answer question 15

15 Describe how the position of the candlechanged if the image of the candle movedaway from the focal point

16 Apply Acoustic scientists sometimes doresearch in rooms that absorb all soundwaves How could such a room be used tostudy how bats find their food

17 Compare White light passes through atranslucent pane of glass and shines on ashirt Both the translucent glass and theshirt appear green Compare the colors oflight that are absorbed and transmitted bythe glass and the shirt

18 Infer Most mammals including dogs andcats canrsquot see colors Infer how the retinaof a catrsquos eye might be different from theretina of a human eye

19 Determine whether a convex lens could forman image that is enlarged real and upright

20 Infer A car comes to a railroad crossingThe driver hears a trainrsquos whistle and itspitch becomes lower What can beassumed about how the train is moving

21 Compare and contrast the reflection of lightfrom a white wall with a rough surfacewith the reflection of light from a mirror

Optical axis

One

focal

length

Two

focal

lengths

Image

Ray A

Object

Focal

point

Interpreting Graphics 22 Infer why a convex mirror and a concavelens can never produce a real image

23 Predict what color a white shirt wouldappear to be if the light reflected from theshirt passed through a red filter and thenthrough a green filter

24 Explain why windows might begin to rattlewhen an airplane flies overhead

25 Communicate Some people enjoy usingsnowmobiles Others object to the noisethat they make Write a proposal for a pol-icy that seems fair to both groups for theuse of snowmobiles in a state park

CHAPTER REVIEW 349

Use the wave speed equation ν ƒλ to answer

questions 26 and 27

26 Calculate Frequency A sonar pulse has awavelength of 30 cm and a speed inwater of 1500 ms Find its frequency

27 Calculate Wavelength What is the wave-length of a sound wave with a fre-quency of 440 Hz if the speed of soundin air is 340 ms

28 Calculate Angle of Incidence A light ray isreflected from a mirror If the anglebetween the incident ray and thereflected ray is 136deg what is the angleof incidence

29 Determine Object Distance You hold anobject in front of a concave mirror witha focal length of 30 cm If you do notsee a reflected image how far from themirror is the object

30 Calculate Speed The speed of light in avacuum is 300000 kms If the index ofrefraction of water is 133 what is thespeed of light in water

More Chapter Review gpesciencecom

1 Which of the following describes the imageformed by a convex mirror

A enlarged

B inverted

C real

D virtual

Use the figure below to answer question 2

2 Which of the following describes a light raythat passes through the focal point andthen is reflected by the mirror

A It travels parallel to the optical axis

B It forms a real image

C It is reflected back through the focal point

D It forms a virtual image

3 Why does an apple look red

A It reflects red light

B It absorbs red light

C It reflects green and blue light

D It reflects all colors of light except red

Use the figure below to answer questions 4 and 5

4 When the primary colors of light are addedtogether what color appears in area H

A cyan

B magenta

C white

D yellow

5 When the primary colors of light are addedtogether what color appears in area G

A cyan

B magenta

C white

D yellow

6 Which of the following increases as the fre-quency of a sound increases

A amplitude

B intensity

C loudness

D pitch

Red Blue

Green

F

H

G K

Focal pointOptical axis

350 STANDARDIZED TEST PRACTICE

Record your answers on the answer sheet provided by your teacher or on a sheet of paper

STANDARDIZED TEST PRACTICE 351

7 Which of the following parts of the eyeenable you to see colors in bright light

A cone cells

B cornea

C lens

D rod cells

Use the graph below to answer questions 8 and 9

8 Determine how far in centimeters theimage is from the lens when the object is15 centimeters from the lens

9 How far in centimeters is the object fromthe lens when the image distance andobject distance are equal

10 A shirt has stripes that are black and whitein white light If green light shines on thisshirt what colors will the black and whitestripes be

11 If you are on a moving train what hap-pens to the pitch of a crossing bell as youapproach the crossing and then moveaway from the crossing

Use the figure below to answer question 12

12 Describe the vision problem show by thefigure and explain how this vision prob-lem can be corrected

13 Explain why the human eye can see colorsbetter in bright light than in dim light

Image Distance fora Convex Lens

Ima

ge

dis

tan

ce (

cm)

30

25

20

15

10

5 10 15 20 25 30

Object distance (cm)

Standardized Test Practice gpesciencecom

Note Units Read carefully and make note of the units used in

any measurement

  • Glencoe Physical Science with Earth Science
    • Student Edition Table of Contents
      • Unit 1 Science and Technology
        • Chapter 1 The Nature of Science
          • Launch Lab Understanding Measurements
          • Foldables
          • Section 1 The Methods of Science
            • Science Online
            • Integrate History
            • Integrate Earth Science
            • Science Online
              • Section 2 Standards of Measurement
                • Applying Math Centimeters
                • Integrate Earth Science
                • Science Online
                • MiniLAB Determining the Density of a Pencil
                • Visualizing SI Dimensions
                  • Section 3 Communicating with Graphs
                    • Applying Math Temperature
                    • MiniLAB Graphing Temperature Change
                    • Lab Whats my graph
                    • Lab Design Your Own - Developing a Measurement System
                    • Science and Language Arts Thinking in Pictures and Other Reports from My Life with Autism
                      • Chapter 1 Study Guide
                      • Chapter 1 Review
                      • Chapter 1 Standardized Test Practice
                        • Chapter 2 Science Technology and Society
                          • Lab Technology in Your Life
                          • Foldables
                          • Section 1 Science and Technology
                            • MiniLAB Researching the Past
                            • Visualizing Technology Supplying Basic Needs
                            • Science Online
                              • Section 2 Forces that Shape Technology
                                • MiniLAB Evaluating the Benefits and Consequences of Technology
                                • Integrate Environment
                                • Integrate History
                                • Applying Science What impact does the accident at Chernobyl have on the future of nuclear power
                                • Science Online
                                • Lab Who contributes CO2
                                  • Section 3 Developing Technology
                                    • Integrate Life Science
                                    • Integrate Career
                                    • Lab Model and Invent - Care Package
                                    • Oops Accidents in Science A Slippery Situation
                                      • Chapter 2 Study Guide
                                      • Chapter 2 Review
                                      • Chapter 2 Standardized Test Practice
                                          • Unit 2 Motion Forces and Energy
                                            • Chapter 3 Motion Acceleration and Forces
                                              • Launch Lab Compare Speeds
                                              • Foldables
                                              • Section 1 Describing Motion
                                                • MiniLAB Measuring Average Speed
                                                • Science Online
                                                • Applying Math Average Speed
                                                • Integrate Astronomy
                                                • Science Online
                                                  • Section 2 Acceleration
                                                    • Integrate History
                                                    • Visualizing Acceleration
                                                      • Section 3 Motion and Forces
                                                        • Science Online
                                                        • MiniLAB Comparing Friction
                                                        • Lab Force and Acceleration
                                                        • Lab Design Your Own - Comparing Motion from Different Forces
                                                        • Science and Language Arts A Brave and Startling Truth
                                                          • Chapter 3 Study Guide
                                                          • Chapter 3 Review
                                                          • Chapter 3 Standardized Test Practice
                                                            • Chapter 4 The Laws of Motion
                                                              • Launch Lab The Force of Gravity
                                                              • Foldables
                                                              • Section 1 The First Two Laws of Motion
                                                                • MiniLAB Observing Inertia
                                                                • Science Online
                                                                • Applying Math The Acceleration of a Sled Solve a Simple Equation
                                                                  • Section 2 Gravity
                                                                    • Science Online
                                                                    • Integrate Earth Science
                                                                    • MiniLAB Observing Centripetal Force
                                                                    • Lab Gravity and Air Resistance
                                                                      • Section 3 The Third Law of Motion
                                                                        • Integrate Career
                                                                        • Visualizing Rocket Motion
                                                                        • Applying Math The Momentum of a Sprinter
                                                                        • Lab The Momentum of Colliding Objects
                                                                        • Science and History Newton and the Plague
                                                                          • Chapter 4 Study Guide
                                                                          • Chapter 4 Review
                                                                          • Chapter 4 Standardized Test Practice
                                                                            • Chapter 5 Energy
                                                                              • Launch Lab Energy Conversions
                                                                              • Foldables
                                                                              • Section 1 The Nature of Energy
                                                                                • Science Online
                                                                                • Applying Math Kinetic Energy
                                                                                • MiniLAB Interpreting Data from a Slingshot
                                                                                • Integrate Language Arts
                                                                                • Applying Math Gravitational Potential Energy
                                                                                • Lab Bouncing Balls
                                                                                  • Section 2 Conservation of Energy
                                                                                    • Visualizing Energy Transformations
                                                                                    • Integrate Environment
                                                                                    • MiniLAB Transforming Energy in a Paper Clip
                                                                                    • Science Online
                                                                                    • Integrate Health
                                                                                    • Lab Design Your Own - Swinging Energy
                                                                                    • Science and History The Impossible Dream
                                                                                      • Chapter 5 Study Guide
                                                                                      • Chapter 5 Review
                                                                                      • Chapter 5 Standardized Test Practice
                                                                                        • Chapter 6 Work and Machines
                                                                                          • Launch Lab Doing Work with a Simple Machine
                                                                                          • Foldables
                                                                                          • Section 1 Work
                                                                                            • Integrate Language Arts
                                                                                            • Applying Math Work
                                                                                            • MiniLAB Calculating Your Work and Power
                                                                                            • Applying Math Power
                                                                                              • Section 2 Using Machines
                                                                                                • MiniLAB Machines Multiplying Force
                                                                                                • Science Online
                                                                                                • Integrate Chemistry
                                                                                                  • Section 3 Simple Machines
                                                                                                    • Integrate History
                                                                                                    • Visualizing Levers in the Human Body
                                                                                                    • Science Online
                                                                                                    • Lab Levers
                                                                                                    • Lab Model and Invent - Using Simple Machines
                                                                                                    • Science and Society The Science of Very Very Small
                                                                                                      • Chapter 6 Study Guide
                                                                                                      • Chapter 6 Review
                                                                                                      • Chapter 6 Standardized Test Practice
                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                          • Launch Lab Relative Sizes of Earth the Moon and the Sun
                                                                                                          • Foldables
                                                                                                          • Section 1 Earth in Space
                                                                                                            • Science Online
                                                                                                            • Integrate Physics
                                                                                                              • Section 2 Time and Seasons
                                                                                                                • MiniLAB Modeling the Suns Rays at Solstice
                                                                                                                • Lab Comparing the Angle of Sunlight to Intensity
                                                                                                                  • Section 3 Earths Moon
                                                                                                                    • Applying Math Tides
                                                                                                                    • MiniLAB Modeling Phases and Eclipses
                                                                                                                    • Integrate History
                                                                                                                    • Integrate History
                                                                                                                    • Science Online
                                                                                                                    • Visualizing Water on the Moon
                                                                                                                    • Lab Identifying the Moons Surface Features and Apollo Landing Sites
                                                                                                                    • Oops Accidents in Science Even Great Scientists Make Mistakes
                                                                                                                      • Chapter 7 Study Guide
                                                                                                                      • Chapter 7 Review
                                                                                                                      • Chapter 7 Standardized Test Practice
                                                                                                                        • Chapter 8 The Solar System
                                                                                                                          • Launch Lab The Size of the Solar System
                                                                                                                          • Foldables
                                                                                                                          • Section 1 Planet Motion
                                                                                                                            • Integrate History
                                                                                                                            • MiniLAB Plotting Retrograde Motion
                                                                                                                            • Integrate Physics
                                                                                                                            • Applying Math Heliocentric Longitude (HL)
                                                                                                                              • Section 2 The Inner Planets
                                                                                                                                • Science Online
                                                                                                                                • Integrate Chemistry
                                                                                                                                • Lab Interpreting Features of Marss Surface
                                                                                                                                  • Section 3 The Outer Planets
                                                                                                                                    • Integrate Language Arts
                                                                                                                                    • Visualizing What Galileo Saw
                                                                                                                                    • Science Online
                                                                                                                                    • MiniLAB Comparing Sizes of Outer and Inner Planets
                                                                                                                                      • Section 4 Life in the Solar System
                                                                                                                                        • Lab Design Your Own - Testing Unknown Soil Samples for Life
                                                                                                                                        • Science Stats Night Sky Wonders
                                                                                                                                          • Chapter 8 Study Guide
                                                                                                                                          • Chapter 8 Review
                                                                                                                                          • Chapter 8 Standardized Test Practice
                                                                                                                                              • Unit 3 Energy in Motion
                                                                                                                                                • Chapter 9 Heat and States of Matter
                                                                                                                                                  • Launch Lab Expansion of a Gas
                                                                                                                                                  • Foldables
                                                                                                                                                  • Section 1 Temperature and Thermal Energy
                                                                                                                                                    • Applying Math Converting to Celsius
                                                                                                                                                    • Science Online
                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                    • Applying Math Change in Thermal Energy
                                                                                                                                                      • Section 2 States of Matter
                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                        • Science Online
                                                                                                                                                        • MiniLAB Comparing States of Water
                                                                                                                                                          • Section 3 Transferring Thermal Energy
                                                                                                                                                            • MiniLAB Comparing Thermal Conductors
                                                                                                                                                            • Visualizing Convection Currents
                                                                                                                                                            • Lab Convection in Gases and Liquids
                                                                                                                                                              • Section 4 Using Thermal Energy
                                                                                                                                                                • Integrate History
                                                                                                                                                                • Science Online
                                                                                                                                                                • Lab Conduction in Gases
                                                                                                                                                                • Science Stats Surprising Thermal Energy
                                                                                                                                                                  • Chapter 9 Study Guide
                                                                                                                                                                  • Chapter 9 Review
                                                                                                                                                                  • Chapter 9 Standardized Test Practice
                                                                                                                                                                    • Chapter 10 Waves
                                                                                                                                                                      • Launch Lab How do waves transfer energy
                                                                                                                                                                      • Foldables
                                                                                                                                                                      • Section 1 The Nature of Waves
                                                                                                                                                                        • Visualizing Formation of Ocean Waves
                                                                                                                                                                        • Science Online
                                                                                                                                                                          • Section 2 Wave Properties
                                                                                                                                                                            • MiniLAB Observing Wavelength
                                                                                                                                                                            • Integrate Social Studies
                                                                                                                                                                            • Applying Math The Speed of Sound
                                                                                                                                                                            • Lab Wave Speed and Tension
                                                                                                                                                                              • Section 3 The Behavior of Waves
                                                                                                                                                                                • Science Online
                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                • MiniLAB Experimenting with Resonance
                                                                                                                                                                                • Lab Measuring Wave Properties
                                                                                                                                                                                • Science and History Making Waves
                                                                                                                                                                                  • Chapter 10 Study Guide
                                                                                                                                                                                  • Chapter 10 Review
                                                                                                                                                                                  • Chapter 10 Standardized Test Practice
                                                                                                                                                                                    • Chapter 11 Sound and Light
                                                                                                                                                                                      • Launch Lab What sound does a ruler make
                                                                                                                                                                                      • Foldables
                                                                                                                                                                                      • Section 1 Sound
                                                                                                                                                                                        • MiniLAB Comparing Intensity
                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                        • Science Online
                                                                                                                                                                                        • Applying Math Using Sonar
                                                                                                                                                                                          • Section 2 Reflection and Refraction of Light
                                                                                                                                                                                          • Section 3 Mirrors Lenses and the Eye
                                                                                                                                                                                            • Visualizing Images Formed by a Convex Lens
                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                            • MiniLAB Experimenting with Focal Lengths
                                                                                                                                                                                            • Lab Reflections of Reflections
                                                                                                                                                                                              • Section 4 Light and Color
                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Lab Design Your Own - Blocking Noise Pollution
                                                                                                                                                                                                • Science and Language Arts A Haiku Garden The Four Seasons in Poems and Print
                                                                                                                                                                                                  • Chapter 11 Study Guide
                                                                                                                                                                                                  • Chapter 11 Review
                                                                                                                                                                                                  • Chapter 11 Standardized Test Practice
                                                                                                                                                                                                    • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                      • Launch Lab Global Jigsaw Puzzle
                                                                                                                                                                                                      • Foldables
                                                                                                                                                                                                      • Section 1 Evolution of Earths Crust
                                                                                                                                                                                                        • Applying Math Spreading Distances
                                                                                                                                                                                                        • Integrate Physics
                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                          • Section 2 Earthquakes
                                                                                                                                                                                                            • MiniLAB Demonstrating Four Types of Stress
                                                                                                                                                                                                            • Visualizing Earthquake-Proof Buildings
                                                                                                                                                                                                              • Section 3 Earths Interior
                                                                                                                                                                                                              • Section 4 Volcanoes
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • MiniLAB Modeling Lava Viscosity
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                • Lab A Case for Pacific Plate Motion
                                                                                                                                                                                                                • Lab Earthquake Earthquake Wheres the earthquake
                                                                                                                                                                                                                • Science and History Volcano Weather
                                                                                                                                                                                                                  • Chapter 12 Study Guide
                                                                                                                                                                                                                  • Chapter 12 Review
                                                                                                                                                                                                                  • Chapter 12 Standardized Test Practice
                                                                                                                                                                                                                      • Unit 4 Forms of Energy
                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                          • Launch Lab Electric Circuits
                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                          • Section 1 Electric Charge
                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                            • Visualizing Lightning
                                                                                                                                                                                                                            • MiniLAB Investigate Charged Objects
                                                                                                                                                                                                                              • Section 2 Electric Current
                                                                                                                                                                                                                                • MiniLAB Investigating Battery Addition
                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                • Lab Identifying Conductors and Insulators
                                                                                                                                                                                                                                  • Section 3 Electrical Energy
                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                    • Applying Math Power Used by a Clothes Dryer
                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                    • Applying Math Electrical Energy Used by a Microwave Oven
                                                                                                                                                                                                                                    • Lab Design Your Own - Comparing Series and Parallel Circuits
                                                                                                                                                                                                                                    • Science and Language Arts Invisible Man
                                                                                                                                                                                                                                      • Chapter 13 Study Guide
                                                                                                                                                                                                                                      • Chapter 13 Review
                                                                                                                                                                                                                                      • Chapter 13 Standardized Test Practice
                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                          • Launch Lab The Strength of Magnets
                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                          • Section 1 Magnetism
                                                                                                                                                                                                                                            • MiniLAB Observing Magnetic Interference
                                                                                                                                                                                                                                            • Integrate Earth Science
                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                            • Applying Science How can magnetic parts of a junk car be salvaged
                                                                                                                                                                                                                                            • MiniLAB Making Your Own Compass
                                                                                                                                                                                                                                              • Section 2 Electricity and Magnetism
                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                  • Section 3 Producing Electric Current
                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                    • Visualizing Motors and Generators
                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                    • Lab Electricity and Magnetism
                                                                                                                                                                                                                                                    • Lab Design Your Own - Controlling Electromagnets
                                                                                                                                                                                                                                                    • Science and History Body Art
                                                                                                                                                                                                                                                      • Chapter 14 Study Guide
                                                                                                                                                                                                                                                      • Chapter 14 Review
                                                                                                                                                                                                                                                      • Chapter 14 Standardized Test Practice
                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                          • Launch Lab Can electromagnetic waves change materials
                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                          • Section 1 What are electromagnetic waves
                                                                                                                                                                                                                                                            • MiniLAB Investigating Electromagnetic Waves
                                                                                                                                                                                                                                                            • Applying Math The Speed of Light in Water
                                                                                                                                                                                                                                                              • Section 2 The Electromagnetic Spectrum
                                                                                                                                                                                                                                                                • MiniLAB Heating with Microwaves
                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                • Lab The Shape of Satellite Dishes
                                                                                                                                                                                                                                                                  • Section 3 Radio Communication
                                                                                                                                                                                                                                                                    • Visualizing Radio Broadcasts
                                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Lab Use the Internet - Radio Frequencies
                                                                                                                                                                                                                                                                    • Science and History Riding a Beam of Light
                                                                                                                                                                                                                                                                      • Chapter 15 Study Guide
                                                                                                                                                                                                                                                                      • Chapter 15 Review
                                                                                                                                                                                                                                                                      • Chapter 15 Standardized Test Practice
                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                          • Launch Lab Heating with Solar Energy
                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                          • Section 1 Fossil Fuels
                                                                                                                                                                                                                                                                            • Visualizing The Formation of Fossil Fuels
                                                                                                                                                                                                                                                                            • MiniLAB Designing an Efficient Water Heater
                                                                                                                                                                                                                                                                              • Section 2 Nuclear Energy
                                                                                                                                                                                                                                                                                • Integrate Earth Science
                                                                                                                                                                                                                                                                                • Integrate Social Science
                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                • Applying Science Can a contaminated radioactive site be reclaimed
                                                                                                                                                                                                                                                                                  • Section 3 Renewable Energy Sources
                                                                                                                                                                                                                                                                                    • MiniLAB Using Solar Power at Home
                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                    • Lab Solar Heating
                                                                                                                                                                                                                                                                                    • Lab Use the Internet How much does energy really cost
                                                                                                                                                                                                                                                                                    • Science and Society Reacting to Nuclear Energy
                                                                                                                                                                                                                                                                                      • Chapter 16 Study Guide
                                                                                                                                                                                                                                                                                      • Chapter 16 Review
                                                                                                                                                                                                                                                                                      • Chapter 16 Standardized Test Practice
                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                          • Lab Atmospheric Pressure
                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                          • Section 1 Earths Atmosphere
                                                                                                                                                                                                                                                                                            • MiniLAB Visualizing Convection
                                                                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                                                                            • Lab Visualizing a Temperature Inversion
                                                                                                                                                                                                                                                                                              • Section 2 Weather
                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Coriolis Effect
                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                  • Section 3 Climate
                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                    • Visualizing Earths Biogeophysical System
                                                                                                                                                                                                                                                                                                      • Section 4 Earths Changing Climates
                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                        • Applying Math Carbon Dioxide (CO2) Concentration
                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Investigating Microclimate
                                                                                                                                                                                                                                                                                                        • Science and Language Arts The Grapes of Wrath
                                                                                                                                                                                                                                                                                                          • Chapter 17 Study Guide
                                                                                                                                                                                                                                                                                                          • Chapter 17 Review
                                                                                                                                                                                                                                                                                                          • Chapter 17 Standardized Test Practice
                                                                                                                                                                                                                                                                                                              • Unit 5 Matter and Earth Materials
                                                                                                                                                                                                                                                                                                                • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                  • Launch Lab Demonstrate the Distillation of Water
                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                  • Section 1 Composition of Matter
                                                                                                                                                                                                                                                                                                                    • Visualizing Elements
                                                                                                                                                                                                                                                                                                                    • MiniLAB Classifying Materials
                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                    • Lab Comparing Pure Substances and Mixtures
                                                                                                                                                                                                                                                                                                                      • Section 2 Properties of Matter
                                                                                                                                                                                                                                                                                                                        • Integrate Environment
                                                                                                                                                                                                                                                                                                                        • MiniLAB Separating Ink
                                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                                        • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                        • Applying Math The Law of Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Measuring the Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Science Stats Intriguing Elements
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Study Guide
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Review
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                            • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                              • Launch Lab Inferring What You Cant Observe
                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                              • Section 1 Structure of the Atom
                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling an Aluminum Atom
                                                                                                                                                                                                                                                                                                                                • Visualizing The Atomic Model
                                                                                                                                                                                                                                                                                                                                  • Section 2 Masses of Atoms
                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                    • Applying Science How can radioactive isotopes help tell time
                                                                                                                                                                                                                                                                                                                                      • Section 3 The Periodic Table
                                                                                                                                                                                                                                                                                                                                        • MiniLAB Organizing a Personal Periodic Table
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Career
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                                                                                                                                                                        • Lab A Periodic Table of Foods
                                                                                                                                                                                                                                                                                                                                        • Lab Use the Internet Whats in a name
                                                                                                                                                                                                                                                                                                                                        • Science and History A Chilling Story
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Study Guide
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Review
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                            • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                              • Launch Lab Earth Materials at Home and School
                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                              • Section 1 Minerals
                                                                                                                                                                                                                                                                                                                                                • MiniLAB Identifying Salts Crystal System
                                                                                                                                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                • Lab Be a Mineral Detective
                                                                                                                                                                                                                                                                                                                                                  • Section 2 Igneous Rocks
                                                                                                                                                                                                                                                                                                                                                    • Applying Math Extrusive Igneous Rock Classification
                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                      • Section 3 Sedimentary Rocks
                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Evaporites
                                                                                                                                                                                                                                                                                                                                                          • Section 4 Metamorphic Rocks and the Rock Cycle
                                                                                                                                                                                                                                                                                                                                                            • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                            • Visualizing Shock Metamorphic Rock
                                                                                                                                                                                                                                                                                                                                                            • Lab Identifying Rocks
                                                                                                                                                                                                                                                                                                                                                            • Science and Society Earth Materials at Work
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Study Guide
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Review
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                  • Launch Lab Have you got the time
                                                                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                                                                  • Section 1 Weathering and Soil
                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing a Disappearing Seasoning
                                                                                                                                                                                                                                                                                                                                                                    • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                    • Lab Graphing Soil Textures
                                                                                                                                                                                                                                                                                                                                                                      • Section 2 Shaping the Landscape
                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Runoff
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                          • Section 3 Groundwater
                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Porosity Volume
                                                                                                                                                                                                                                                                                                                                                                            • Visualizing The Role of Groundwater in Shaping Earths Surface
                                                                                                                                                                                                                                                                                                                                                                            • Integrate Environment
                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                              • Section 4 Geologic Time
                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                                                                                                • Lab Its about time - relative that is
                                                                                                                                                                                                                                                                                                                                                                                • Science and Society Tapping into the Underground
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Review
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                      • Unit 6 Interactions of Matter
                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                          • Lab Chemical Bonds and Mixing
                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Stability in Bonding
                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                            • Lab Atomic Trading Cards
                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Types of Bonds
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Observing a Bond Type
                                                                                                                                                                                                                                                                                                                                                                                                • Visualizing Polar Molecules
                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Writing Formulas and Naming Compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math Determining a Formula
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Science Can you name binary ionic compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Making a Hydrate
                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Model and Invent - Modeling Chemical Bonding
                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Sticky Subject
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Review
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab RustingmdashA Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Chemical Changes
                                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Designing a Team Equation
                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Chemical Equations
                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math Barium Sulfate Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Classifying Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 4 Reaction Rates and Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing Chemical Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Creating a Colorful Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab To Glow or Not to Glow
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Investigating Reaction Conditions
                                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Clumsy Move Pays Off
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Review
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab Magic Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 How Solutions Form
                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                                                                                                                                                                                                                                                            • Visualizing Metal Alloys
                                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Observing the Effect of Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Solubility and Concentration
                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Acids Bases and Salts
                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing Acid Relief
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Strength of Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Determining Acidity
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Saturated Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and Society Acid Rain
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab The Size of a Nucleus
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Strong Force
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Nuclear Decay
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Detecting Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math The Age of Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Social Studies
                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Nuclear Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling a Nuclear Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Visualizing PET Scans
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Chain Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Model and Invent Modeling Transmutations
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and History The Nuclear Alchemist
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 26 Stars and Galaxies
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab Stars in the Sky
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Observing the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling a Telescope
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math The Magnifying Power of Telescopes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Evolution of Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Counting Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing H-R Diagrams of Star Clusters
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Star Cluster Age
                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 3 Galaxies and the Milky Way
                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 4 Cosmology
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Lab Model and Invent - Expansion of the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Science and Language Arts Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Student Resources
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 1 The Nature of Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 2 Science Technology and Society
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 3 Motion Acceleration and Forces
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 4 The Laws of Motion
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 5 Energy
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 6 Work and Machines
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 8 The Solar System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 9 Heat and States of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 10 Waves
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 11 Sound and Light
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 26 Stars and Galaxies
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Page 27: 706 S1 318-326 GPS09 - Light-and-Sound - home · PDF fileWhat sound does a ruler make? ... sound waves cannot travel in empty space where there are no particles. ... sound travels

Design Your OwnDesign Your Own

344

Real-World ProblemWhat loud noises do you enjoy and which ones do you find annoying

Most people enjoy a music concert performed by their favorite artist or

the booming displays of fireworks on the Fourth of July Most people

enjoy these loud sounds for short periods of time However certain

other loud noises such as traffic sirens and loud talking can be

annoying Constant annoying noises are called noise pollution What

can be done to reduce noise pollution What types of barriers will best

block out noise pollution

Form a HypothesisBased on your experiences with loud noises form a hypothesis that

predicts the effectiveness of different types of barriers at blocking out

noise pollution

Test Your HypothesisMake a Plan

1 Complete the safety form

2 Decide what type of barriers or materials you will test

3 Describe exactly how you will use these materials

Goals Design an experiment

that tests the effective-

ness of various types of

barriers and materials

for blocking out noise

pollution

Test different types of

materials and barriers

to determine the best

noise blocks

Possible Materialsradio CD player horn

drum or other loud

noise source

shrubs trees concrete

walls brick walls stone

walls wooden fences

parked cars or hanging

laundry

sound meter

meterstick or metric tape

measure

Blocking NfisePollution

4 Identify the controls and variables you will use in your

experiment

5 List the steps you will use and describe each step precisely

6 Prepare a data table in your Science Journal to record your

measurements

7 Organize the steps of your experiment in logical order

Follow Your Plan

1 Ask your teacher to approve your plan and data table before

you start

2 Conduct your experiment as planned

3 Test each barrier two or three times

4 Record the results from each test in your data table in your Science Journal

Analyze Your Data1 Identify the barriers that most effectively reduced noise pollution

2 Identify the barriers that least effectively reduced noise pollution

3 Compare the effective barriers and identify common characteristics that might

explain why they reduced noise pollution

4 Compare the natural barriers you tested with the artificial barriers Which type

of barrier best reduced noise pollution

5 Compare the different types of materials the barriers were made of Which

type of material best reduced noise pollution

Conclude and Apply1 Evaluate whether your results support your hypothesis

2 Predict how your results would differ if you used a louder source of noise such

as a siren

3 Infer from your results how people living near a

busy street could reduce noise pollution

4 Identify major sources of noise pollution in or

near your home How could they be reduced

5 Research how noise pollution can be

unhealthy

LAB 345

Draw a poster illustrating how builders and

landscapers could use certain materials to

better insulate a home or office from excess

noise pollution

346 CHAPTER 11 Sound and Light

A Haiku GardenThe Four Seasons in Poems and Prints

by Stephen Addiss with Fumiko and Akira Yamamoto

Respond to the Reading1 How do the illustrations help the reader

better understand the poems2 What do you think is meant by the

word lingering in the Haiku about springsunlight

3 Linking Science and Writing Writeone haiku about summer and anotherabout fall In one poem use color tohelp you describe the season In theother use light or some property oflight to help describe the season

Research has deter-mined that there is a

connection between color and mood Warmcolors have longer wavelengths and can bemore stimulating Cool colors which haveshorter wavelengths tend to have a calmingor soothing effect on people Light and colorhave long been used as literary symbols Doesthe use of color change what you imaginewhen you read the haiku

UnderstandingLiteratureJapanese Haiku A haiku is a verse thatconsists of three lines and 17 syllables inthe Japanese language The first and thirdlines have five syllables each and themiddle line has seven syllables Why isimagination important in reading haiku

Lingering

in every pool of watermdash

spring sunlightIssa

Withered by winter

the sound of the windmdash

one-color worldBasho

Sound

1 Sound waves are compressional waves thattravel only in matter

2 The speed of sound in a material dependson the type of material as well as itstemperature

3 Loudness depends on a sound waversquos inten-sity Pitch depends on a sound waversquosfrequency

4 Sound waves are used in echolocationsonar and medical imaging

Reflection and Refractionof Light

1 Light can be absorbed reflected or trans-mitted by a material

2 When light waves are reflected theyobey the law of reflectionmdashthe angle ofincidence equals the angle of reflection

3 A light wave is refracted or bent whenit changes speed as it travels at an anglefrom one material to another

Mirrors Lenses andthe Eye

1 Plane mirrors form upright virtual images

2 Images formed by concave mirrors andconvex lenses depend on the location ofthe object relative to the focal point

3 Convex mirrors and concave lenses formvirtual upright images that are smallerthan the object

4 The lens in the human eye changes shape toproduce a sharp image on the retina

Light and Color

1 You see color when light is reflected offobjects and into your eyes

2 Cone cells in the retina are light-sensitivecells that enable you to distinguish colors

3 Red blue and green are the three primarycolors of light and can be mixed to form allother colors

4 The primary pigment colors are magentacyan and yellow

CHAPTER STUDY GUIDE 347

Use the Foldable you made at the beginningof the chapter to help you review sound and light

Interactive Tutor gpesciencecom

Complete each statement with the correctvocabulary word or phrase

1 A change in frequency due to a movingsound source is due to the

2 A flat smooth surface that reflects light andforms an image is a(n)

3 An object is if you can seethrough it clearly

4 The of a material indicates howmuch the speed of light in the materialchanges as light passes through

5 You can change the color of white paint byadding a(n) to it

6 A(n) is a reflecting surface thatcurves outward like the back of a spoon

7 The human perception of the intensity of asound wave is

Choose the word or phrase that best answerseach question

8 Which of the following best describes imageformation by a plane mirrorA) A real image is formed in front of the mirrorB) A real image is formed behind the mirrorC) A virtual image is formed in front of the

mirrorD) A virtual image is formed behind the mirror

9 For a sound with low pitch what else isalso always lowA) amplitude C) wavelengthB) frequency D) wave velocity

10 Which of the following occurs when asound source moves away from youA) The soundrsquos velocity decreasesB) The soundrsquos loudness increasesC) The soundrsquos frequency decreasesD) The soundrsquos frequency increases

Use the table below to answer question 11

11 Based on the data in the table abovewhich of the following would be the speedof sound in air at 30degCA) 3404 ms C) 3494 msB) 3464 ms D) 3534 ms

12 What happens to a light ray travelingparallel to the optical axis of a convexlens that passes through the lensA) It travels parallel to the optical axisB) It passes through the focal pointC) It is bent away from the optical axisD) It forms a virtual image

13 Light waves of which color are bent mostwhen passing through a prismA) blue C) violetB) red D) yellow

14 Which way does a concave lens bend lightA) toward its optical axisB) toward its centerC) toward its edgesD) toward its focal point

Speed of Sound in Air

Temp peed( s)

4

4

4

348 CHAPTER REVIEW

concave lens p 335concave mirror p 332convex lens p 333convex mirror p 333decibel p 322Doppler effect p 323index of refraction p 329intensity p 322

loudness p 322opaque p 327pigment p 342pitch p 323plane mirror p 331translucent p 327transparent p 327

Vocabulary PuzzleMaker gpesciencecom

Use the illustration below to answer question 15

15 Describe how the position of the candlechanged if the image of the candle movedaway from the focal point

16 Apply Acoustic scientists sometimes doresearch in rooms that absorb all soundwaves How could such a room be used tostudy how bats find their food

17 Compare White light passes through atranslucent pane of glass and shines on ashirt Both the translucent glass and theshirt appear green Compare the colors oflight that are absorbed and transmitted bythe glass and the shirt

18 Infer Most mammals including dogs andcats canrsquot see colors Infer how the retinaof a catrsquos eye might be different from theretina of a human eye

19 Determine whether a convex lens could forman image that is enlarged real and upright

20 Infer A car comes to a railroad crossingThe driver hears a trainrsquos whistle and itspitch becomes lower What can beassumed about how the train is moving

21 Compare and contrast the reflection of lightfrom a white wall with a rough surfacewith the reflection of light from a mirror

Optical axis

One

focal

length

Two

focal

lengths

Image

Ray A

Object

Focal

point

Interpreting Graphics 22 Infer why a convex mirror and a concavelens can never produce a real image

23 Predict what color a white shirt wouldappear to be if the light reflected from theshirt passed through a red filter and thenthrough a green filter

24 Explain why windows might begin to rattlewhen an airplane flies overhead

25 Communicate Some people enjoy usingsnowmobiles Others object to the noisethat they make Write a proposal for a pol-icy that seems fair to both groups for theuse of snowmobiles in a state park

CHAPTER REVIEW 349

Use the wave speed equation ν ƒλ to answer

questions 26 and 27

26 Calculate Frequency A sonar pulse has awavelength of 30 cm and a speed inwater of 1500 ms Find its frequency

27 Calculate Wavelength What is the wave-length of a sound wave with a fre-quency of 440 Hz if the speed of soundin air is 340 ms

28 Calculate Angle of Incidence A light ray isreflected from a mirror If the anglebetween the incident ray and thereflected ray is 136deg what is the angleof incidence

29 Determine Object Distance You hold anobject in front of a concave mirror witha focal length of 30 cm If you do notsee a reflected image how far from themirror is the object

30 Calculate Speed The speed of light in avacuum is 300000 kms If the index ofrefraction of water is 133 what is thespeed of light in water

More Chapter Review gpesciencecom

1 Which of the following describes the imageformed by a convex mirror

A enlarged

B inverted

C real

D virtual

Use the figure below to answer question 2

2 Which of the following describes a light raythat passes through the focal point andthen is reflected by the mirror

A It travels parallel to the optical axis

B It forms a real image

C It is reflected back through the focal point

D It forms a virtual image

3 Why does an apple look red

A It reflects red light

B It absorbs red light

C It reflects green and blue light

D It reflects all colors of light except red

Use the figure below to answer questions 4 and 5

4 When the primary colors of light are addedtogether what color appears in area H

A cyan

B magenta

C white

D yellow

5 When the primary colors of light are addedtogether what color appears in area G

A cyan

B magenta

C white

D yellow

6 Which of the following increases as the fre-quency of a sound increases

A amplitude

B intensity

C loudness

D pitch

Red Blue

Green

F

H

G K

Focal pointOptical axis

350 STANDARDIZED TEST PRACTICE

Record your answers on the answer sheet provided by your teacher or on a sheet of paper

STANDARDIZED TEST PRACTICE 351

7 Which of the following parts of the eyeenable you to see colors in bright light

A cone cells

B cornea

C lens

D rod cells

Use the graph below to answer questions 8 and 9

8 Determine how far in centimeters theimage is from the lens when the object is15 centimeters from the lens

9 How far in centimeters is the object fromthe lens when the image distance andobject distance are equal

10 A shirt has stripes that are black and whitein white light If green light shines on thisshirt what colors will the black and whitestripes be

11 If you are on a moving train what hap-pens to the pitch of a crossing bell as youapproach the crossing and then moveaway from the crossing

Use the figure below to answer question 12

12 Describe the vision problem show by thefigure and explain how this vision prob-lem can be corrected

13 Explain why the human eye can see colorsbetter in bright light than in dim light

Image Distance fora Convex Lens

Ima

ge

dis

tan

ce (

cm)

30

25

20

15

10

5 10 15 20 25 30

Object distance (cm)

Standardized Test Practice gpesciencecom

Note Units Read carefully and make note of the units used in

any measurement

  • Glencoe Physical Science with Earth Science
    • Student Edition Table of Contents
      • Unit 1 Science and Technology
        • Chapter 1 The Nature of Science
          • Launch Lab Understanding Measurements
          • Foldables
          • Section 1 The Methods of Science
            • Science Online
            • Integrate History
            • Integrate Earth Science
            • Science Online
              • Section 2 Standards of Measurement
                • Applying Math Centimeters
                • Integrate Earth Science
                • Science Online
                • MiniLAB Determining the Density of a Pencil
                • Visualizing SI Dimensions
                  • Section 3 Communicating with Graphs
                    • Applying Math Temperature
                    • MiniLAB Graphing Temperature Change
                    • Lab Whats my graph
                    • Lab Design Your Own - Developing a Measurement System
                    • Science and Language Arts Thinking in Pictures and Other Reports from My Life with Autism
                      • Chapter 1 Study Guide
                      • Chapter 1 Review
                      • Chapter 1 Standardized Test Practice
                        • Chapter 2 Science Technology and Society
                          • Lab Technology in Your Life
                          • Foldables
                          • Section 1 Science and Technology
                            • MiniLAB Researching the Past
                            • Visualizing Technology Supplying Basic Needs
                            • Science Online
                              • Section 2 Forces that Shape Technology
                                • MiniLAB Evaluating the Benefits and Consequences of Technology
                                • Integrate Environment
                                • Integrate History
                                • Applying Science What impact does the accident at Chernobyl have on the future of nuclear power
                                • Science Online
                                • Lab Who contributes CO2
                                  • Section 3 Developing Technology
                                    • Integrate Life Science
                                    • Integrate Career
                                    • Lab Model and Invent - Care Package
                                    • Oops Accidents in Science A Slippery Situation
                                      • Chapter 2 Study Guide
                                      • Chapter 2 Review
                                      • Chapter 2 Standardized Test Practice
                                          • Unit 2 Motion Forces and Energy
                                            • Chapter 3 Motion Acceleration and Forces
                                              • Launch Lab Compare Speeds
                                              • Foldables
                                              • Section 1 Describing Motion
                                                • MiniLAB Measuring Average Speed
                                                • Science Online
                                                • Applying Math Average Speed
                                                • Integrate Astronomy
                                                • Science Online
                                                  • Section 2 Acceleration
                                                    • Integrate History
                                                    • Visualizing Acceleration
                                                      • Section 3 Motion and Forces
                                                        • Science Online
                                                        • MiniLAB Comparing Friction
                                                        • Lab Force and Acceleration
                                                        • Lab Design Your Own - Comparing Motion from Different Forces
                                                        • Science and Language Arts A Brave and Startling Truth
                                                          • Chapter 3 Study Guide
                                                          • Chapter 3 Review
                                                          • Chapter 3 Standardized Test Practice
                                                            • Chapter 4 The Laws of Motion
                                                              • Launch Lab The Force of Gravity
                                                              • Foldables
                                                              • Section 1 The First Two Laws of Motion
                                                                • MiniLAB Observing Inertia
                                                                • Science Online
                                                                • Applying Math The Acceleration of a Sled Solve a Simple Equation
                                                                  • Section 2 Gravity
                                                                    • Science Online
                                                                    • Integrate Earth Science
                                                                    • MiniLAB Observing Centripetal Force
                                                                    • Lab Gravity and Air Resistance
                                                                      • Section 3 The Third Law of Motion
                                                                        • Integrate Career
                                                                        • Visualizing Rocket Motion
                                                                        • Applying Math The Momentum of a Sprinter
                                                                        • Lab The Momentum of Colliding Objects
                                                                        • Science and History Newton and the Plague
                                                                          • Chapter 4 Study Guide
                                                                          • Chapter 4 Review
                                                                          • Chapter 4 Standardized Test Practice
                                                                            • Chapter 5 Energy
                                                                              • Launch Lab Energy Conversions
                                                                              • Foldables
                                                                              • Section 1 The Nature of Energy
                                                                                • Science Online
                                                                                • Applying Math Kinetic Energy
                                                                                • MiniLAB Interpreting Data from a Slingshot
                                                                                • Integrate Language Arts
                                                                                • Applying Math Gravitational Potential Energy
                                                                                • Lab Bouncing Balls
                                                                                  • Section 2 Conservation of Energy
                                                                                    • Visualizing Energy Transformations
                                                                                    • Integrate Environment
                                                                                    • MiniLAB Transforming Energy in a Paper Clip
                                                                                    • Science Online
                                                                                    • Integrate Health
                                                                                    • Lab Design Your Own - Swinging Energy
                                                                                    • Science and History The Impossible Dream
                                                                                      • Chapter 5 Study Guide
                                                                                      • Chapter 5 Review
                                                                                      • Chapter 5 Standardized Test Practice
                                                                                        • Chapter 6 Work and Machines
                                                                                          • Launch Lab Doing Work with a Simple Machine
                                                                                          • Foldables
                                                                                          • Section 1 Work
                                                                                            • Integrate Language Arts
                                                                                            • Applying Math Work
                                                                                            • MiniLAB Calculating Your Work and Power
                                                                                            • Applying Math Power
                                                                                              • Section 2 Using Machines
                                                                                                • MiniLAB Machines Multiplying Force
                                                                                                • Science Online
                                                                                                • Integrate Chemistry
                                                                                                  • Section 3 Simple Machines
                                                                                                    • Integrate History
                                                                                                    • Visualizing Levers in the Human Body
                                                                                                    • Science Online
                                                                                                    • Lab Levers
                                                                                                    • Lab Model and Invent - Using Simple Machines
                                                                                                    • Science and Society The Science of Very Very Small
                                                                                                      • Chapter 6 Study Guide
                                                                                                      • Chapter 6 Review
                                                                                                      • Chapter 6 Standardized Test Practice
                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                          • Launch Lab Relative Sizes of Earth the Moon and the Sun
                                                                                                          • Foldables
                                                                                                          • Section 1 Earth in Space
                                                                                                            • Science Online
                                                                                                            • Integrate Physics
                                                                                                              • Section 2 Time and Seasons
                                                                                                                • MiniLAB Modeling the Suns Rays at Solstice
                                                                                                                • Lab Comparing the Angle of Sunlight to Intensity
                                                                                                                  • Section 3 Earths Moon
                                                                                                                    • Applying Math Tides
                                                                                                                    • MiniLAB Modeling Phases and Eclipses
                                                                                                                    • Integrate History
                                                                                                                    • Integrate History
                                                                                                                    • Science Online
                                                                                                                    • Visualizing Water on the Moon
                                                                                                                    • Lab Identifying the Moons Surface Features and Apollo Landing Sites
                                                                                                                    • Oops Accidents in Science Even Great Scientists Make Mistakes
                                                                                                                      • Chapter 7 Study Guide
                                                                                                                      • Chapter 7 Review
                                                                                                                      • Chapter 7 Standardized Test Practice
                                                                                                                        • Chapter 8 The Solar System
                                                                                                                          • Launch Lab The Size of the Solar System
                                                                                                                          • Foldables
                                                                                                                          • Section 1 Planet Motion
                                                                                                                            • Integrate History
                                                                                                                            • MiniLAB Plotting Retrograde Motion
                                                                                                                            • Integrate Physics
                                                                                                                            • Applying Math Heliocentric Longitude (HL)
                                                                                                                              • Section 2 The Inner Planets
                                                                                                                                • Science Online
                                                                                                                                • Integrate Chemistry
                                                                                                                                • Lab Interpreting Features of Marss Surface
                                                                                                                                  • Section 3 The Outer Planets
                                                                                                                                    • Integrate Language Arts
                                                                                                                                    • Visualizing What Galileo Saw
                                                                                                                                    • Science Online
                                                                                                                                    • MiniLAB Comparing Sizes of Outer and Inner Planets
                                                                                                                                      • Section 4 Life in the Solar System
                                                                                                                                        • Lab Design Your Own - Testing Unknown Soil Samples for Life
                                                                                                                                        • Science Stats Night Sky Wonders
                                                                                                                                          • Chapter 8 Study Guide
                                                                                                                                          • Chapter 8 Review
                                                                                                                                          • Chapter 8 Standardized Test Practice
                                                                                                                                              • Unit 3 Energy in Motion
                                                                                                                                                • Chapter 9 Heat and States of Matter
                                                                                                                                                  • Launch Lab Expansion of a Gas
                                                                                                                                                  • Foldables
                                                                                                                                                  • Section 1 Temperature and Thermal Energy
                                                                                                                                                    • Applying Math Converting to Celsius
                                                                                                                                                    • Science Online
                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                    • Applying Math Change in Thermal Energy
                                                                                                                                                      • Section 2 States of Matter
                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                        • Science Online
                                                                                                                                                        • MiniLAB Comparing States of Water
                                                                                                                                                          • Section 3 Transferring Thermal Energy
                                                                                                                                                            • MiniLAB Comparing Thermal Conductors
                                                                                                                                                            • Visualizing Convection Currents
                                                                                                                                                            • Lab Convection in Gases and Liquids
                                                                                                                                                              • Section 4 Using Thermal Energy
                                                                                                                                                                • Integrate History
                                                                                                                                                                • Science Online
                                                                                                                                                                • Lab Conduction in Gases
                                                                                                                                                                • Science Stats Surprising Thermal Energy
                                                                                                                                                                  • Chapter 9 Study Guide
                                                                                                                                                                  • Chapter 9 Review
                                                                                                                                                                  • Chapter 9 Standardized Test Practice
                                                                                                                                                                    • Chapter 10 Waves
                                                                                                                                                                      • Launch Lab How do waves transfer energy
                                                                                                                                                                      • Foldables
                                                                                                                                                                      • Section 1 The Nature of Waves
                                                                                                                                                                        • Visualizing Formation of Ocean Waves
                                                                                                                                                                        • Science Online
                                                                                                                                                                          • Section 2 Wave Properties
                                                                                                                                                                            • MiniLAB Observing Wavelength
                                                                                                                                                                            • Integrate Social Studies
                                                                                                                                                                            • Applying Math The Speed of Sound
                                                                                                                                                                            • Lab Wave Speed and Tension
                                                                                                                                                                              • Section 3 The Behavior of Waves
                                                                                                                                                                                • Science Online
                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                • MiniLAB Experimenting with Resonance
                                                                                                                                                                                • Lab Measuring Wave Properties
                                                                                                                                                                                • Science and History Making Waves
                                                                                                                                                                                  • Chapter 10 Study Guide
                                                                                                                                                                                  • Chapter 10 Review
                                                                                                                                                                                  • Chapter 10 Standardized Test Practice
                                                                                                                                                                                    • Chapter 11 Sound and Light
                                                                                                                                                                                      • Launch Lab What sound does a ruler make
                                                                                                                                                                                      • Foldables
                                                                                                                                                                                      • Section 1 Sound
                                                                                                                                                                                        • MiniLAB Comparing Intensity
                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                        • Science Online
                                                                                                                                                                                        • Applying Math Using Sonar
                                                                                                                                                                                          • Section 2 Reflection and Refraction of Light
                                                                                                                                                                                          • Section 3 Mirrors Lenses and the Eye
                                                                                                                                                                                            • Visualizing Images Formed by a Convex Lens
                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                            • MiniLAB Experimenting with Focal Lengths
                                                                                                                                                                                            • Lab Reflections of Reflections
                                                                                                                                                                                              • Section 4 Light and Color
                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Lab Design Your Own - Blocking Noise Pollution
                                                                                                                                                                                                • Science and Language Arts A Haiku Garden The Four Seasons in Poems and Print
                                                                                                                                                                                                  • Chapter 11 Study Guide
                                                                                                                                                                                                  • Chapter 11 Review
                                                                                                                                                                                                  • Chapter 11 Standardized Test Practice
                                                                                                                                                                                                    • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                      • Launch Lab Global Jigsaw Puzzle
                                                                                                                                                                                                      • Foldables
                                                                                                                                                                                                      • Section 1 Evolution of Earths Crust
                                                                                                                                                                                                        • Applying Math Spreading Distances
                                                                                                                                                                                                        • Integrate Physics
                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                          • Section 2 Earthquakes
                                                                                                                                                                                                            • MiniLAB Demonstrating Four Types of Stress
                                                                                                                                                                                                            • Visualizing Earthquake-Proof Buildings
                                                                                                                                                                                                              • Section 3 Earths Interior
                                                                                                                                                                                                              • Section 4 Volcanoes
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • MiniLAB Modeling Lava Viscosity
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                • Lab A Case for Pacific Plate Motion
                                                                                                                                                                                                                • Lab Earthquake Earthquake Wheres the earthquake
                                                                                                                                                                                                                • Science and History Volcano Weather
                                                                                                                                                                                                                  • Chapter 12 Study Guide
                                                                                                                                                                                                                  • Chapter 12 Review
                                                                                                                                                                                                                  • Chapter 12 Standardized Test Practice
                                                                                                                                                                                                                      • Unit 4 Forms of Energy
                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                          • Launch Lab Electric Circuits
                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                          • Section 1 Electric Charge
                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                            • Visualizing Lightning
                                                                                                                                                                                                                            • MiniLAB Investigate Charged Objects
                                                                                                                                                                                                                              • Section 2 Electric Current
                                                                                                                                                                                                                                • MiniLAB Investigating Battery Addition
                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                • Lab Identifying Conductors and Insulators
                                                                                                                                                                                                                                  • Section 3 Electrical Energy
                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                    • Applying Math Power Used by a Clothes Dryer
                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                    • Applying Math Electrical Energy Used by a Microwave Oven
                                                                                                                                                                                                                                    • Lab Design Your Own - Comparing Series and Parallel Circuits
                                                                                                                                                                                                                                    • Science and Language Arts Invisible Man
                                                                                                                                                                                                                                      • Chapter 13 Study Guide
                                                                                                                                                                                                                                      • Chapter 13 Review
                                                                                                                                                                                                                                      • Chapter 13 Standardized Test Practice
                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                          • Launch Lab The Strength of Magnets
                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                          • Section 1 Magnetism
                                                                                                                                                                                                                                            • MiniLAB Observing Magnetic Interference
                                                                                                                                                                                                                                            • Integrate Earth Science
                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                            • Applying Science How can magnetic parts of a junk car be salvaged
                                                                                                                                                                                                                                            • MiniLAB Making Your Own Compass
                                                                                                                                                                                                                                              • Section 2 Electricity and Magnetism
                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                  • Section 3 Producing Electric Current
                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                    • Visualizing Motors and Generators
                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                    • Lab Electricity and Magnetism
                                                                                                                                                                                                                                                    • Lab Design Your Own - Controlling Electromagnets
                                                                                                                                                                                                                                                    • Science and History Body Art
                                                                                                                                                                                                                                                      • Chapter 14 Study Guide
                                                                                                                                                                                                                                                      • Chapter 14 Review
                                                                                                                                                                                                                                                      • Chapter 14 Standardized Test Practice
                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                          • Launch Lab Can electromagnetic waves change materials
                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                          • Section 1 What are electromagnetic waves
                                                                                                                                                                                                                                                            • MiniLAB Investigating Electromagnetic Waves
                                                                                                                                                                                                                                                            • Applying Math The Speed of Light in Water
                                                                                                                                                                                                                                                              • Section 2 The Electromagnetic Spectrum
                                                                                                                                                                                                                                                                • MiniLAB Heating with Microwaves
                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                • Lab The Shape of Satellite Dishes
                                                                                                                                                                                                                                                                  • Section 3 Radio Communication
                                                                                                                                                                                                                                                                    • Visualizing Radio Broadcasts
                                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Lab Use the Internet - Radio Frequencies
                                                                                                                                                                                                                                                                    • Science and History Riding a Beam of Light
                                                                                                                                                                                                                                                                      • Chapter 15 Study Guide
                                                                                                                                                                                                                                                                      • Chapter 15 Review
                                                                                                                                                                                                                                                                      • Chapter 15 Standardized Test Practice
                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                          • Launch Lab Heating with Solar Energy
                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                          • Section 1 Fossil Fuels
                                                                                                                                                                                                                                                                            • Visualizing The Formation of Fossil Fuels
                                                                                                                                                                                                                                                                            • MiniLAB Designing an Efficient Water Heater
                                                                                                                                                                                                                                                                              • Section 2 Nuclear Energy
                                                                                                                                                                                                                                                                                • Integrate Earth Science
                                                                                                                                                                                                                                                                                • Integrate Social Science
                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                • Applying Science Can a contaminated radioactive site be reclaimed
                                                                                                                                                                                                                                                                                  • Section 3 Renewable Energy Sources
                                                                                                                                                                                                                                                                                    • MiniLAB Using Solar Power at Home
                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                    • Lab Solar Heating
                                                                                                                                                                                                                                                                                    • Lab Use the Internet How much does energy really cost
                                                                                                                                                                                                                                                                                    • Science and Society Reacting to Nuclear Energy
                                                                                                                                                                                                                                                                                      • Chapter 16 Study Guide
                                                                                                                                                                                                                                                                                      • Chapter 16 Review
                                                                                                                                                                                                                                                                                      • Chapter 16 Standardized Test Practice
                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                          • Lab Atmospheric Pressure
                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                          • Section 1 Earths Atmosphere
                                                                                                                                                                                                                                                                                            • MiniLAB Visualizing Convection
                                                                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                                                                            • Lab Visualizing a Temperature Inversion
                                                                                                                                                                                                                                                                                              • Section 2 Weather
                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Coriolis Effect
                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                  • Section 3 Climate
                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                    • Visualizing Earths Biogeophysical System
                                                                                                                                                                                                                                                                                                      • Section 4 Earths Changing Climates
                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                        • Applying Math Carbon Dioxide (CO2) Concentration
                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Investigating Microclimate
                                                                                                                                                                                                                                                                                                        • Science and Language Arts The Grapes of Wrath
                                                                                                                                                                                                                                                                                                          • Chapter 17 Study Guide
                                                                                                                                                                                                                                                                                                          • Chapter 17 Review
                                                                                                                                                                                                                                                                                                          • Chapter 17 Standardized Test Practice
                                                                                                                                                                                                                                                                                                              • Unit 5 Matter and Earth Materials
                                                                                                                                                                                                                                                                                                                • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                  • Launch Lab Demonstrate the Distillation of Water
                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                  • Section 1 Composition of Matter
                                                                                                                                                                                                                                                                                                                    • Visualizing Elements
                                                                                                                                                                                                                                                                                                                    • MiniLAB Classifying Materials
                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                    • Lab Comparing Pure Substances and Mixtures
                                                                                                                                                                                                                                                                                                                      • Section 2 Properties of Matter
                                                                                                                                                                                                                                                                                                                        • Integrate Environment
                                                                                                                                                                                                                                                                                                                        • MiniLAB Separating Ink
                                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                                        • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                        • Applying Math The Law of Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Measuring the Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Science Stats Intriguing Elements
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Study Guide
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Review
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                            • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                              • Launch Lab Inferring What You Cant Observe
                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                              • Section 1 Structure of the Atom
                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling an Aluminum Atom
                                                                                                                                                                                                                                                                                                                                • Visualizing The Atomic Model
                                                                                                                                                                                                                                                                                                                                  • Section 2 Masses of Atoms
                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                    • Applying Science How can radioactive isotopes help tell time
                                                                                                                                                                                                                                                                                                                                      • Section 3 The Periodic Table
                                                                                                                                                                                                                                                                                                                                        • MiniLAB Organizing a Personal Periodic Table
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Career
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                                                                                                                                                                        • Lab A Periodic Table of Foods
                                                                                                                                                                                                                                                                                                                                        • Lab Use the Internet Whats in a name
                                                                                                                                                                                                                                                                                                                                        • Science and History A Chilling Story
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Study Guide
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Review
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                            • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                              • Launch Lab Earth Materials at Home and School
                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                              • Section 1 Minerals
                                                                                                                                                                                                                                                                                                                                                • MiniLAB Identifying Salts Crystal System
                                                                                                                                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                • Lab Be a Mineral Detective
                                                                                                                                                                                                                                                                                                                                                  • Section 2 Igneous Rocks
                                                                                                                                                                                                                                                                                                                                                    • Applying Math Extrusive Igneous Rock Classification
                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                      • Section 3 Sedimentary Rocks
                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Evaporites
                                                                                                                                                                                                                                                                                                                                                          • Section 4 Metamorphic Rocks and the Rock Cycle
                                                                                                                                                                                                                                                                                                                                                            • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                            • Visualizing Shock Metamorphic Rock
                                                                                                                                                                                                                                                                                                                                                            • Lab Identifying Rocks
                                                                                                                                                                                                                                                                                                                                                            • Science and Society Earth Materials at Work
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Study Guide
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Review
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                  • Launch Lab Have you got the time
                                                                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                                                                  • Section 1 Weathering and Soil
                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing a Disappearing Seasoning
                                                                                                                                                                                                                                                                                                                                                                    • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                    • Lab Graphing Soil Textures
                                                                                                                                                                                                                                                                                                                                                                      • Section 2 Shaping the Landscape
                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Runoff
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                          • Section 3 Groundwater
                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Porosity Volume
                                                                                                                                                                                                                                                                                                                                                                            • Visualizing The Role of Groundwater in Shaping Earths Surface
                                                                                                                                                                                                                                                                                                                                                                            • Integrate Environment
                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                              • Section 4 Geologic Time
                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                                                                                                • Lab Its about time - relative that is
                                                                                                                                                                                                                                                                                                                                                                                • Science and Society Tapping into the Underground
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Review
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                      • Unit 6 Interactions of Matter
                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                          • Lab Chemical Bonds and Mixing
                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Stability in Bonding
                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                            • Lab Atomic Trading Cards
                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Types of Bonds
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Observing a Bond Type
                                                                                                                                                                                                                                                                                                                                                                                                • Visualizing Polar Molecules
                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Writing Formulas and Naming Compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math Determining a Formula
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Science Can you name binary ionic compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Making a Hydrate
                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Model and Invent - Modeling Chemical Bonding
                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Sticky Subject
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Review
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab RustingmdashA Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Chemical Changes
                                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Designing a Team Equation
                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Chemical Equations
                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math Barium Sulfate Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Classifying Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 4 Reaction Rates and Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing Chemical Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Creating a Colorful Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab To Glow or Not to Glow
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Investigating Reaction Conditions
                                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Clumsy Move Pays Off
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Review
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab Magic Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 How Solutions Form
                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                                                                                                                                                                                                                                                            • Visualizing Metal Alloys
                                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Observing the Effect of Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Solubility and Concentration
                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Acids Bases and Salts
                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing Acid Relief
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Strength of Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Determining Acidity
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Saturated Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and Society Acid Rain
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab The Size of a Nucleus
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Strong Force
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Nuclear Decay
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Detecting Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math The Age of Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Social Studies
                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Nuclear Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling a Nuclear Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Visualizing PET Scans
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Chain Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Model and Invent Modeling Transmutations
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and History The Nuclear Alchemist
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 26 Stars and Galaxies
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab Stars in the Sky
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Observing the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling a Telescope
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math The Magnifying Power of Telescopes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Evolution of Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Counting Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing H-R Diagrams of Star Clusters
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Star Cluster Age
                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 3 Galaxies and the Milky Way
                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 4 Cosmology
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Lab Model and Invent - Expansion of the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Science and Language Arts Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Student Resources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Skill Handbook
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Scientific Methods
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Safety Symbols
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Safety in the Science Laboratory
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Math Skill Handbook
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Math Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Science Applications
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Formulas
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Extra Math Problems
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Reference Handbook
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Minerals
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Physical Science Reference Tables
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Periodic Table of the Elements
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Weather Map Symbols
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                • EnglishSpanish Glossary
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Index
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Credits
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Students Workbooks
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter Resources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 1 The Nature of Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 2 Science Technology and Society
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 3 Motion Acceleration and Forces
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 4 The Laws of Motion
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 5 Energy
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 6 Work and Machines
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 8 The Solar System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 9 Heat and States of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 10 Waves
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 11 Sound and Light
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 26 Stars and Galaxies
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Additional Resources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Dinah Zikes Teaching Science with Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Laboratory Activities Manual
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Mastering Standardized Tests
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Mathematics Skill Activities
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Probeware Labs
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Reading and Writing in the Science Classroom
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Reading and Writing Skill Activities
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Science Inquiry Labs
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Study Guide and Reinforcement
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Page 28: 706 S1 318-326 GPS09 - Light-and-Sound - home · PDF fileWhat sound does a ruler make? ... sound waves cannot travel in empty space where there are no particles. ... sound travels

4 Identify the controls and variables you will use in your

experiment

5 List the steps you will use and describe each step precisely

6 Prepare a data table in your Science Journal to record your

measurements

7 Organize the steps of your experiment in logical order

Follow Your Plan

1 Ask your teacher to approve your plan and data table before

you start

2 Conduct your experiment as planned

3 Test each barrier two or three times

4 Record the results from each test in your data table in your Science Journal

Analyze Your Data1 Identify the barriers that most effectively reduced noise pollution

2 Identify the barriers that least effectively reduced noise pollution

3 Compare the effective barriers and identify common characteristics that might

explain why they reduced noise pollution

4 Compare the natural barriers you tested with the artificial barriers Which type

of barrier best reduced noise pollution

5 Compare the different types of materials the barriers were made of Which

type of material best reduced noise pollution

Conclude and Apply1 Evaluate whether your results support your hypothesis

2 Predict how your results would differ if you used a louder source of noise such

as a siren

3 Infer from your results how people living near a

busy street could reduce noise pollution

4 Identify major sources of noise pollution in or

near your home How could they be reduced

5 Research how noise pollution can be

unhealthy

LAB 345

Draw a poster illustrating how builders and

landscapers could use certain materials to

better insulate a home or office from excess

noise pollution

346 CHAPTER 11 Sound and Light

A Haiku GardenThe Four Seasons in Poems and Prints

by Stephen Addiss with Fumiko and Akira Yamamoto

Respond to the Reading1 How do the illustrations help the reader

better understand the poems2 What do you think is meant by the

word lingering in the Haiku about springsunlight

3 Linking Science and Writing Writeone haiku about summer and anotherabout fall In one poem use color tohelp you describe the season In theother use light or some property oflight to help describe the season

Research has deter-mined that there is a

connection between color and mood Warmcolors have longer wavelengths and can bemore stimulating Cool colors which haveshorter wavelengths tend to have a calmingor soothing effect on people Light and colorhave long been used as literary symbols Doesthe use of color change what you imaginewhen you read the haiku

UnderstandingLiteratureJapanese Haiku A haiku is a verse thatconsists of three lines and 17 syllables inthe Japanese language The first and thirdlines have five syllables each and themiddle line has seven syllables Why isimagination important in reading haiku

Lingering

in every pool of watermdash

spring sunlightIssa

Withered by winter

the sound of the windmdash

one-color worldBasho

Sound

1 Sound waves are compressional waves thattravel only in matter

2 The speed of sound in a material dependson the type of material as well as itstemperature

3 Loudness depends on a sound waversquos inten-sity Pitch depends on a sound waversquosfrequency

4 Sound waves are used in echolocationsonar and medical imaging

Reflection and Refractionof Light

1 Light can be absorbed reflected or trans-mitted by a material

2 When light waves are reflected theyobey the law of reflectionmdashthe angle ofincidence equals the angle of reflection

3 A light wave is refracted or bent whenit changes speed as it travels at an anglefrom one material to another

Mirrors Lenses andthe Eye

1 Plane mirrors form upright virtual images

2 Images formed by concave mirrors andconvex lenses depend on the location ofthe object relative to the focal point

3 Convex mirrors and concave lenses formvirtual upright images that are smallerthan the object

4 The lens in the human eye changes shape toproduce a sharp image on the retina

Light and Color

1 You see color when light is reflected offobjects and into your eyes

2 Cone cells in the retina are light-sensitivecells that enable you to distinguish colors

3 Red blue and green are the three primarycolors of light and can be mixed to form allother colors

4 The primary pigment colors are magentacyan and yellow

CHAPTER STUDY GUIDE 347

Use the Foldable you made at the beginningof the chapter to help you review sound and light

Interactive Tutor gpesciencecom

Complete each statement with the correctvocabulary word or phrase

1 A change in frequency due to a movingsound source is due to the

2 A flat smooth surface that reflects light andforms an image is a(n)

3 An object is if you can seethrough it clearly

4 The of a material indicates howmuch the speed of light in the materialchanges as light passes through

5 You can change the color of white paint byadding a(n) to it

6 A(n) is a reflecting surface thatcurves outward like the back of a spoon

7 The human perception of the intensity of asound wave is

Choose the word or phrase that best answerseach question

8 Which of the following best describes imageformation by a plane mirrorA) A real image is formed in front of the mirrorB) A real image is formed behind the mirrorC) A virtual image is formed in front of the

mirrorD) A virtual image is formed behind the mirror

9 For a sound with low pitch what else isalso always lowA) amplitude C) wavelengthB) frequency D) wave velocity

10 Which of the following occurs when asound source moves away from youA) The soundrsquos velocity decreasesB) The soundrsquos loudness increasesC) The soundrsquos frequency decreasesD) The soundrsquos frequency increases

Use the table below to answer question 11

11 Based on the data in the table abovewhich of the following would be the speedof sound in air at 30degCA) 3404 ms C) 3494 msB) 3464 ms D) 3534 ms

12 What happens to a light ray travelingparallel to the optical axis of a convexlens that passes through the lensA) It travels parallel to the optical axisB) It passes through the focal pointC) It is bent away from the optical axisD) It forms a virtual image

13 Light waves of which color are bent mostwhen passing through a prismA) blue C) violetB) red D) yellow

14 Which way does a concave lens bend lightA) toward its optical axisB) toward its centerC) toward its edgesD) toward its focal point

Speed of Sound in Air

Temp peed( s)

4

4

4

348 CHAPTER REVIEW

concave lens p 335concave mirror p 332convex lens p 333convex mirror p 333decibel p 322Doppler effect p 323index of refraction p 329intensity p 322

loudness p 322opaque p 327pigment p 342pitch p 323plane mirror p 331translucent p 327transparent p 327

Vocabulary PuzzleMaker gpesciencecom

Use the illustration below to answer question 15

15 Describe how the position of the candlechanged if the image of the candle movedaway from the focal point

16 Apply Acoustic scientists sometimes doresearch in rooms that absorb all soundwaves How could such a room be used tostudy how bats find their food

17 Compare White light passes through atranslucent pane of glass and shines on ashirt Both the translucent glass and theshirt appear green Compare the colors oflight that are absorbed and transmitted bythe glass and the shirt

18 Infer Most mammals including dogs andcats canrsquot see colors Infer how the retinaof a catrsquos eye might be different from theretina of a human eye

19 Determine whether a convex lens could forman image that is enlarged real and upright

20 Infer A car comes to a railroad crossingThe driver hears a trainrsquos whistle and itspitch becomes lower What can beassumed about how the train is moving

21 Compare and contrast the reflection of lightfrom a white wall with a rough surfacewith the reflection of light from a mirror

Optical axis

One

focal

length

Two

focal

lengths

Image

Ray A

Object

Focal

point

Interpreting Graphics 22 Infer why a convex mirror and a concavelens can never produce a real image

23 Predict what color a white shirt wouldappear to be if the light reflected from theshirt passed through a red filter and thenthrough a green filter

24 Explain why windows might begin to rattlewhen an airplane flies overhead

25 Communicate Some people enjoy usingsnowmobiles Others object to the noisethat they make Write a proposal for a pol-icy that seems fair to both groups for theuse of snowmobiles in a state park

CHAPTER REVIEW 349

Use the wave speed equation ν ƒλ to answer

questions 26 and 27

26 Calculate Frequency A sonar pulse has awavelength of 30 cm and a speed inwater of 1500 ms Find its frequency

27 Calculate Wavelength What is the wave-length of a sound wave with a fre-quency of 440 Hz if the speed of soundin air is 340 ms

28 Calculate Angle of Incidence A light ray isreflected from a mirror If the anglebetween the incident ray and thereflected ray is 136deg what is the angleof incidence

29 Determine Object Distance You hold anobject in front of a concave mirror witha focal length of 30 cm If you do notsee a reflected image how far from themirror is the object

30 Calculate Speed The speed of light in avacuum is 300000 kms If the index ofrefraction of water is 133 what is thespeed of light in water

More Chapter Review gpesciencecom

1 Which of the following describes the imageformed by a convex mirror

A enlarged

B inverted

C real

D virtual

Use the figure below to answer question 2

2 Which of the following describes a light raythat passes through the focal point andthen is reflected by the mirror

A It travels parallel to the optical axis

B It forms a real image

C It is reflected back through the focal point

D It forms a virtual image

3 Why does an apple look red

A It reflects red light

B It absorbs red light

C It reflects green and blue light

D It reflects all colors of light except red

Use the figure below to answer questions 4 and 5

4 When the primary colors of light are addedtogether what color appears in area H

A cyan

B magenta

C white

D yellow

5 When the primary colors of light are addedtogether what color appears in area G

A cyan

B magenta

C white

D yellow

6 Which of the following increases as the fre-quency of a sound increases

A amplitude

B intensity

C loudness

D pitch

Red Blue

Green

F

H

G K

Focal pointOptical axis

350 STANDARDIZED TEST PRACTICE

Record your answers on the answer sheet provided by your teacher or on a sheet of paper

STANDARDIZED TEST PRACTICE 351

7 Which of the following parts of the eyeenable you to see colors in bright light

A cone cells

B cornea

C lens

D rod cells

Use the graph below to answer questions 8 and 9

8 Determine how far in centimeters theimage is from the lens when the object is15 centimeters from the lens

9 How far in centimeters is the object fromthe lens when the image distance andobject distance are equal

10 A shirt has stripes that are black and whitein white light If green light shines on thisshirt what colors will the black and whitestripes be

11 If you are on a moving train what hap-pens to the pitch of a crossing bell as youapproach the crossing and then moveaway from the crossing

Use the figure below to answer question 12

12 Describe the vision problem show by thefigure and explain how this vision prob-lem can be corrected

13 Explain why the human eye can see colorsbetter in bright light than in dim light

Image Distance fora Convex Lens

Ima

ge

dis

tan

ce (

cm)

30

25

20

15

10

5 10 15 20 25 30

Object distance (cm)

Standardized Test Practice gpesciencecom

Note Units Read carefully and make note of the units used in

any measurement

  • Glencoe Physical Science with Earth Science
    • Student Edition Table of Contents
      • Unit 1 Science and Technology
        • Chapter 1 The Nature of Science
          • Launch Lab Understanding Measurements
          • Foldables
          • Section 1 The Methods of Science
            • Science Online
            • Integrate History
            • Integrate Earth Science
            • Science Online
              • Section 2 Standards of Measurement
                • Applying Math Centimeters
                • Integrate Earth Science
                • Science Online
                • MiniLAB Determining the Density of a Pencil
                • Visualizing SI Dimensions
                  • Section 3 Communicating with Graphs
                    • Applying Math Temperature
                    • MiniLAB Graphing Temperature Change
                    • Lab Whats my graph
                    • Lab Design Your Own - Developing a Measurement System
                    • Science and Language Arts Thinking in Pictures and Other Reports from My Life with Autism
                      • Chapter 1 Study Guide
                      • Chapter 1 Review
                      • Chapter 1 Standardized Test Practice
                        • Chapter 2 Science Technology and Society
                          • Lab Technology in Your Life
                          • Foldables
                          • Section 1 Science and Technology
                            • MiniLAB Researching the Past
                            • Visualizing Technology Supplying Basic Needs
                            • Science Online
                              • Section 2 Forces that Shape Technology
                                • MiniLAB Evaluating the Benefits and Consequences of Technology
                                • Integrate Environment
                                • Integrate History
                                • Applying Science What impact does the accident at Chernobyl have on the future of nuclear power
                                • Science Online
                                • Lab Who contributes CO2
                                  • Section 3 Developing Technology
                                    • Integrate Life Science
                                    • Integrate Career
                                    • Lab Model and Invent - Care Package
                                    • Oops Accidents in Science A Slippery Situation
                                      • Chapter 2 Study Guide
                                      • Chapter 2 Review
                                      • Chapter 2 Standardized Test Practice
                                          • Unit 2 Motion Forces and Energy
                                            • Chapter 3 Motion Acceleration and Forces
                                              • Launch Lab Compare Speeds
                                              • Foldables
                                              • Section 1 Describing Motion
                                                • MiniLAB Measuring Average Speed
                                                • Science Online
                                                • Applying Math Average Speed
                                                • Integrate Astronomy
                                                • Science Online
                                                  • Section 2 Acceleration
                                                    • Integrate History
                                                    • Visualizing Acceleration
                                                      • Section 3 Motion and Forces
                                                        • Science Online
                                                        • MiniLAB Comparing Friction
                                                        • Lab Force and Acceleration
                                                        • Lab Design Your Own - Comparing Motion from Different Forces
                                                        • Science and Language Arts A Brave and Startling Truth
                                                          • Chapter 3 Study Guide
                                                          • Chapter 3 Review
                                                          • Chapter 3 Standardized Test Practice
                                                            • Chapter 4 The Laws of Motion
                                                              • Launch Lab The Force of Gravity
                                                              • Foldables
                                                              • Section 1 The First Two Laws of Motion
                                                                • MiniLAB Observing Inertia
                                                                • Science Online
                                                                • Applying Math The Acceleration of a Sled Solve a Simple Equation
                                                                  • Section 2 Gravity
                                                                    • Science Online
                                                                    • Integrate Earth Science
                                                                    • MiniLAB Observing Centripetal Force
                                                                    • Lab Gravity and Air Resistance
                                                                      • Section 3 The Third Law of Motion
                                                                        • Integrate Career
                                                                        • Visualizing Rocket Motion
                                                                        • Applying Math The Momentum of a Sprinter
                                                                        • Lab The Momentum of Colliding Objects
                                                                        • Science and History Newton and the Plague
                                                                          • Chapter 4 Study Guide
                                                                          • Chapter 4 Review
                                                                          • Chapter 4 Standardized Test Practice
                                                                            • Chapter 5 Energy
                                                                              • Launch Lab Energy Conversions
                                                                              • Foldables
                                                                              • Section 1 The Nature of Energy
                                                                                • Science Online
                                                                                • Applying Math Kinetic Energy
                                                                                • MiniLAB Interpreting Data from a Slingshot
                                                                                • Integrate Language Arts
                                                                                • Applying Math Gravitational Potential Energy
                                                                                • Lab Bouncing Balls
                                                                                  • Section 2 Conservation of Energy
                                                                                    • Visualizing Energy Transformations
                                                                                    • Integrate Environment
                                                                                    • MiniLAB Transforming Energy in a Paper Clip
                                                                                    • Science Online
                                                                                    • Integrate Health
                                                                                    • Lab Design Your Own - Swinging Energy
                                                                                    • Science and History The Impossible Dream
                                                                                      • Chapter 5 Study Guide
                                                                                      • Chapter 5 Review
                                                                                      • Chapter 5 Standardized Test Practice
                                                                                        • Chapter 6 Work and Machines
                                                                                          • Launch Lab Doing Work with a Simple Machine
                                                                                          • Foldables
                                                                                          • Section 1 Work
                                                                                            • Integrate Language Arts
                                                                                            • Applying Math Work
                                                                                            • MiniLAB Calculating Your Work and Power
                                                                                            • Applying Math Power
                                                                                              • Section 2 Using Machines
                                                                                                • MiniLAB Machines Multiplying Force
                                                                                                • Science Online
                                                                                                • Integrate Chemistry
                                                                                                  • Section 3 Simple Machines
                                                                                                    • Integrate History
                                                                                                    • Visualizing Levers in the Human Body
                                                                                                    • Science Online
                                                                                                    • Lab Levers
                                                                                                    • Lab Model and Invent - Using Simple Machines
                                                                                                    • Science and Society The Science of Very Very Small
                                                                                                      • Chapter 6 Study Guide
                                                                                                      • Chapter 6 Review
                                                                                                      • Chapter 6 Standardized Test Practice
                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                          • Launch Lab Relative Sizes of Earth the Moon and the Sun
                                                                                                          • Foldables
                                                                                                          • Section 1 Earth in Space
                                                                                                            • Science Online
                                                                                                            • Integrate Physics
                                                                                                              • Section 2 Time and Seasons
                                                                                                                • MiniLAB Modeling the Suns Rays at Solstice
                                                                                                                • Lab Comparing the Angle of Sunlight to Intensity
                                                                                                                  • Section 3 Earths Moon
                                                                                                                    • Applying Math Tides
                                                                                                                    • MiniLAB Modeling Phases and Eclipses
                                                                                                                    • Integrate History
                                                                                                                    • Integrate History
                                                                                                                    • Science Online
                                                                                                                    • Visualizing Water on the Moon
                                                                                                                    • Lab Identifying the Moons Surface Features and Apollo Landing Sites
                                                                                                                    • Oops Accidents in Science Even Great Scientists Make Mistakes
                                                                                                                      • Chapter 7 Study Guide
                                                                                                                      • Chapter 7 Review
                                                                                                                      • Chapter 7 Standardized Test Practice
                                                                                                                        • Chapter 8 The Solar System
                                                                                                                          • Launch Lab The Size of the Solar System
                                                                                                                          • Foldables
                                                                                                                          • Section 1 Planet Motion
                                                                                                                            • Integrate History
                                                                                                                            • MiniLAB Plotting Retrograde Motion
                                                                                                                            • Integrate Physics
                                                                                                                            • Applying Math Heliocentric Longitude (HL)
                                                                                                                              • Section 2 The Inner Planets
                                                                                                                                • Science Online
                                                                                                                                • Integrate Chemistry
                                                                                                                                • Lab Interpreting Features of Marss Surface
                                                                                                                                  • Section 3 The Outer Planets
                                                                                                                                    • Integrate Language Arts
                                                                                                                                    • Visualizing What Galileo Saw
                                                                                                                                    • Science Online
                                                                                                                                    • MiniLAB Comparing Sizes of Outer and Inner Planets
                                                                                                                                      • Section 4 Life in the Solar System
                                                                                                                                        • Lab Design Your Own - Testing Unknown Soil Samples for Life
                                                                                                                                        • Science Stats Night Sky Wonders
                                                                                                                                          • Chapter 8 Study Guide
                                                                                                                                          • Chapter 8 Review
                                                                                                                                          • Chapter 8 Standardized Test Practice
                                                                                                                                              • Unit 3 Energy in Motion
                                                                                                                                                • Chapter 9 Heat and States of Matter
                                                                                                                                                  • Launch Lab Expansion of a Gas
                                                                                                                                                  • Foldables
                                                                                                                                                  • Section 1 Temperature and Thermal Energy
                                                                                                                                                    • Applying Math Converting to Celsius
                                                                                                                                                    • Science Online
                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                    • Applying Math Change in Thermal Energy
                                                                                                                                                      • Section 2 States of Matter
                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                        • Science Online
                                                                                                                                                        • MiniLAB Comparing States of Water
                                                                                                                                                          • Section 3 Transferring Thermal Energy
                                                                                                                                                            • MiniLAB Comparing Thermal Conductors
                                                                                                                                                            • Visualizing Convection Currents
                                                                                                                                                            • Lab Convection in Gases and Liquids
                                                                                                                                                              • Section 4 Using Thermal Energy
                                                                                                                                                                • Integrate History
                                                                                                                                                                • Science Online
                                                                                                                                                                • Lab Conduction in Gases
                                                                                                                                                                • Science Stats Surprising Thermal Energy
                                                                                                                                                                  • Chapter 9 Study Guide
                                                                                                                                                                  • Chapter 9 Review
                                                                                                                                                                  • Chapter 9 Standardized Test Practice
                                                                                                                                                                    • Chapter 10 Waves
                                                                                                                                                                      • Launch Lab How do waves transfer energy
                                                                                                                                                                      • Foldables
                                                                                                                                                                      • Section 1 The Nature of Waves
                                                                                                                                                                        • Visualizing Formation of Ocean Waves
                                                                                                                                                                        • Science Online
                                                                                                                                                                          • Section 2 Wave Properties
                                                                                                                                                                            • MiniLAB Observing Wavelength
                                                                                                                                                                            • Integrate Social Studies
                                                                                                                                                                            • Applying Math The Speed of Sound
                                                                                                                                                                            • Lab Wave Speed and Tension
                                                                                                                                                                              • Section 3 The Behavior of Waves
                                                                                                                                                                                • Science Online
                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                • MiniLAB Experimenting with Resonance
                                                                                                                                                                                • Lab Measuring Wave Properties
                                                                                                                                                                                • Science and History Making Waves
                                                                                                                                                                                  • Chapter 10 Study Guide
                                                                                                                                                                                  • Chapter 10 Review
                                                                                                                                                                                  • Chapter 10 Standardized Test Practice
                                                                                                                                                                                    • Chapter 11 Sound and Light
                                                                                                                                                                                      • Launch Lab What sound does a ruler make
                                                                                                                                                                                      • Foldables
                                                                                                                                                                                      • Section 1 Sound
                                                                                                                                                                                        • MiniLAB Comparing Intensity
                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                        • Science Online
                                                                                                                                                                                        • Applying Math Using Sonar
                                                                                                                                                                                          • Section 2 Reflection and Refraction of Light
                                                                                                                                                                                          • Section 3 Mirrors Lenses and the Eye
                                                                                                                                                                                            • Visualizing Images Formed by a Convex Lens
                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                            • MiniLAB Experimenting with Focal Lengths
                                                                                                                                                                                            • Lab Reflections of Reflections
                                                                                                                                                                                              • Section 4 Light and Color
                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Lab Design Your Own - Blocking Noise Pollution
                                                                                                                                                                                                • Science and Language Arts A Haiku Garden The Four Seasons in Poems and Print
                                                                                                                                                                                                  • Chapter 11 Study Guide
                                                                                                                                                                                                  • Chapter 11 Review
                                                                                                                                                                                                  • Chapter 11 Standardized Test Practice
                                                                                                                                                                                                    • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                      • Launch Lab Global Jigsaw Puzzle
                                                                                                                                                                                                      • Foldables
                                                                                                                                                                                                      • Section 1 Evolution of Earths Crust
                                                                                                                                                                                                        • Applying Math Spreading Distances
                                                                                                                                                                                                        • Integrate Physics
                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                          • Section 2 Earthquakes
                                                                                                                                                                                                            • MiniLAB Demonstrating Four Types of Stress
                                                                                                                                                                                                            • Visualizing Earthquake-Proof Buildings
                                                                                                                                                                                                              • Section 3 Earths Interior
                                                                                                                                                                                                              • Section 4 Volcanoes
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • MiniLAB Modeling Lava Viscosity
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                • Lab A Case for Pacific Plate Motion
                                                                                                                                                                                                                • Lab Earthquake Earthquake Wheres the earthquake
                                                                                                                                                                                                                • Science and History Volcano Weather
                                                                                                                                                                                                                  • Chapter 12 Study Guide
                                                                                                                                                                                                                  • Chapter 12 Review
                                                                                                                                                                                                                  • Chapter 12 Standardized Test Practice
                                                                                                                                                                                                                      • Unit 4 Forms of Energy
                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                          • Launch Lab Electric Circuits
                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                          • Section 1 Electric Charge
                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                            • Visualizing Lightning
                                                                                                                                                                                                                            • MiniLAB Investigate Charged Objects
                                                                                                                                                                                                                              • Section 2 Electric Current
                                                                                                                                                                                                                                • MiniLAB Investigating Battery Addition
                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                • Lab Identifying Conductors and Insulators
                                                                                                                                                                                                                                  • Section 3 Electrical Energy
                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                    • Applying Math Power Used by a Clothes Dryer
                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                    • Applying Math Electrical Energy Used by a Microwave Oven
                                                                                                                                                                                                                                    • Lab Design Your Own - Comparing Series and Parallel Circuits
                                                                                                                                                                                                                                    • Science and Language Arts Invisible Man
                                                                                                                                                                                                                                      • Chapter 13 Study Guide
                                                                                                                                                                                                                                      • Chapter 13 Review
                                                                                                                                                                                                                                      • Chapter 13 Standardized Test Practice
                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                          • Launch Lab The Strength of Magnets
                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                          • Section 1 Magnetism
                                                                                                                                                                                                                                            • MiniLAB Observing Magnetic Interference
                                                                                                                                                                                                                                            • Integrate Earth Science
                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                            • Applying Science How can magnetic parts of a junk car be salvaged
                                                                                                                                                                                                                                            • MiniLAB Making Your Own Compass
                                                                                                                                                                                                                                              • Section 2 Electricity and Magnetism
                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                  • Section 3 Producing Electric Current
                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                    • Visualizing Motors and Generators
                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                    • Lab Electricity and Magnetism
                                                                                                                                                                                                                                                    • Lab Design Your Own - Controlling Electromagnets
                                                                                                                                                                                                                                                    • Science and History Body Art
                                                                                                                                                                                                                                                      • Chapter 14 Study Guide
                                                                                                                                                                                                                                                      • Chapter 14 Review
                                                                                                                                                                                                                                                      • Chapter 14 Standardized Test Practice
                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                          • Launch Lab Can electromagnetic waves change materials
                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                          • Section 1 What are electromagnetic waves
                                                                                                                                                                                                                                                            • MiniLAB Investigating Electromagnetic Waves
                                                                                                                                                                                                                                                            • Applying Math The Speed of Light in Water
                                                                                                                                                                                                                                                              • Section 2 The Electromagnetic Spectrum
                                                                                                                                                                                                                                                                • MiniLAB Heating with Microwaves
                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                • Lab The Shape of Satellite Dishes
                                                                                                                                                                                                                                                                  • Section 3 Radio Communication
                                                                                                                                                                                                                                                                    • Visualizing Radio Broadcasts
                                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Lab Use the Internet - Radio Frequencies
                                                                                                                                                                                                                                                                    • Science and History Riding a Beam of Light
                                                                                                                                                                                                                                                                      • Chapter 15 Study Guide
                                                                                                                                                                                                                                                                      • Chapter 15 Review
                                                                                                                                                                                                                                                                      • Chapter 15 Standardized Test Practice
                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                          • Launch Lab Heating with Solar Energy
                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                          • Section 1 Fossil Fuels
                                                                                                                                                                                                                                                                            • Visualizing The Formation of Fossil Fuels
                                                                                                                                                                                                                                                                            • MiniLAB Designing an Efficient Water Heater
                                                                                                                                                                                                                                                                              • Section 2 Nuclear Energy
                                                                                                                                                                                                                                                                                • Integrate Earth Science
                                                                                                                                                                                                                                                                                • Integrate Social Science
                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                • Applying Science Can a contaminated radioactive site be reclaimed
                                                                                                                                                                                                                                                                                  • Section 3 Renewable Energy Sources
                                                                                                                                                                                                                                                                                    • MiniLAB Using Solar Power at Home
                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                    • Lab Solar Heating
                                                                                                                                                                                                                                                                                    • Lab Use the Internet How much does energy really cost
                                                                                                                                                                                                                                                                                    • Science and Society Reacting to Nuclear Energy
                                                                                                                                                                                                                                                                                      • Chapter 16 Study Guide
                                                                                                                                                                                                                                                                                      • Chapter 16 Review
                                                                                                                                                                                                                                                                                      • Chapter 16 Standardized Test Practice
                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                          • Lab Atmospheric Pressure
                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                          • Section 1 Earths Atmosphere
                                                                                                                                                                                                                                                                                            • MiniLAB Visualizing Convection
                                                                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                                                                            • Lab Visualizing a Temperature Inversion
                                                                                                                                                                                                                                                                                              • Section 2 Weather
                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Coriolis Effect
                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                  • Section 3 Climate
                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                    • Visualizing Earths Biogeophysical System
                                                                                                                                                                                                                                                                                                      • Section 4 Earths Changing Climates
                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                        • Applying Math Carbon Dioxide (CO2) Concentration
                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Investigating Microclimate
                                                                                                                                                                                                                                                                                                        • Science and Language Arts The Grapes of Wrath
                                                                                                                                                                                                                                                                                                          • Chapter 17 Study Guide
                                                                                                                                                                                                                                                                                                          • Chapter 17 Review
                                                                                                                                                                                                                                                                                                          • Chapter 17 Standardized Test Practice
                                                                                                                                                                                                                                                                                                              • Unit 5 Matter and Earth Materials
                                                                                                                                                                                                                                                                                                                • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                  • Launch Lab Demonstrate the Distillation of Water
                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                  • Section 1 Composition of Matter
                                                                                                                                                                                                                                                                                                                    • Visualizing Elements
                                                                                                                                                                                                                                                                                                                    • MiniLAB Classifying Materials
                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                    • Lab Comparing Pure Substances and Mixtures
                                                                                                                                                                                                                                                                                                                      • Section 2 Properties of Matter
                                                                                                                                                                                                                                                                                                                        • Integrate Environment
                                                                                                                                                                                                                                                                                                                        • MiniLAB Separating Ink
                                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                                        • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                        • Applying Math The Law of Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Measuring the Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Science Stats Intriguing Elements
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Study Guide
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Review
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                            • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                              • Launch Lab Inferring What You Cant Observe
                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                              • Section 1 Structure of the Atom
                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling an Aluminum Atom
                                                                                                                                                                                                                                                                                                                                • Visualizing The Atomic Model
                                                                                                                                                                                                                                                                                                                                  • Section 2 Masses of Atoms
                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                    • Applying Science How can radioactive isotopes help tell time
                                                                                                                                                                                                                                                                                                                                      • Section 3 The Periodic Table
                                                                                                                                                                                                                                                                                                                                        • MiniLAB Organizing a Personal Periodic Table
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Career
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                                                                                                                                                                        • Lab A Periodic Table of Foods
                                                                                                                                                                                                                                                                                                                                        • Lab Use the Internet Whats in a name
                                                                                                                                                                                                                                                                                                                                        • Science and History A Chilling Story
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Study Guide
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Review
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                            • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                              • Launch Lab Earth Materials at Home and School
                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                              • Section 1 Minerals
                                                                                                                                                                                                                                                                                                                                                • MiniLAB Identifying Salts Crystal System
                                                                                                                                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                • Lab Be a Mineral Detective
                                                                                                                                                                                                                                                                                                                                                  • Section 2 Igneous Rocks
                                                                                                                                                                                                                                                                                                                                                    • Applying Math Extrusive Igneous Rock Classification
                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                      • Section 3 Sedimentary Rocks
                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Evaporites
                                                                                                                                                                                                                                                                                                                                                          • Section 4 Metamorphic Rocks and the Rock Cycle
                                                                                                                                                                                                                                                                                                                                                            • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                            • Visualizing Shock Metamorphic Rock
                                                                                                                                                                                                                                                                                                                                                            • Lab Identifying Rocks
                                                                                                                                                                                                                                                                                                                                                            • Science and Society Earth Materials at Work
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Study Guide
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Review
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                  • Launch Lab Have you got the time
                                                                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                                                                  • Section 1 Weathering and Soil
                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing a Disappearing Seasoning
                                                                                                                                                                                                                                                                                                                                                                    • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                    • Lab Graphing Soil Textures
                                                                                                                                                                                                                                                                                                                                                                      • Section 2 Shaping the Landscape
                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Runoff
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                          • Section 3 Groundwater
                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Porosity Volume
                                                                                                                                                                                                                                                                                                                                                                            • Visualizing The Role of Groundwater in Shaping Earths Surface
                                                                                                                                                                                                                                                                                                                                                                            • Integrate Environment
                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                              • Section 4 Geologic Time
                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                                                                                                • Lab Its about time - relative that is
                                                                                                                                                                                                                                                                                                                                                                                • Science and Society Tapping into the Underground
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Review
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                      • Unit 6 Interactions of Matter
                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                          • Lab Chemical Bonds and Mixing
                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Stability in Bonding
                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                            • Lab Atomic Trading Cards
                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Types of Bonds
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Observing a Bond Type
                                                                                                                                                                                                                                                                                                                                                                                                • Visualizing Polar Molecules
                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Writing Formulas and Naming Compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math Determining a Formula
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Science Can you name binary ionic compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Making a Hydrate
                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Model and Invent - Modeling Chemical Bonding
                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Sticky Subject
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Review
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab RustingmdashA Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Chemical Changes
                                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Designing a Team Equation
                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Chemical Equations
                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math Barium Sulfate Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Classifying Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 4 Reaction Rates and Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing Chemical Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Creating a Colorful Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab To Glow or Not to Glow
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Investigating Reaction Conditions
                                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Clumsy Move Pays Off
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Review
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab Magic Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 How Solutions Form
                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                                                                                                                                                                                                                                                            • Visualizing Metal Alloys
                                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Observing the Effect of Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Solubility and Concentration
                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Acids Bases and Salts
                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing Acid Relief
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Strength of Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Determining Acidity
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Saturated Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and Society Acid Rain
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab The Size of a Nucleus
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Strong Force
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Nuclear Decay
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Detecting Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math The Age of Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Social Studies
                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Nuclear Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling a Nuclear Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Visualizing PET Scans
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Chain Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Model and Invent Modeling Transmutations
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and History The Nuclear Alchemist
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 26 Stars and Galaxies
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab Stars in the Sky
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Observing the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling a Telescope
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math The Magnifying Power of Telescopes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Evolution of Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Counting Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing H-R Diagrams of Star Clusters
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Star Cluster Age
                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 3 Galaxies and the Milky Way
                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 4 Cosmology
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Lab Model and Invent - Expansion of the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Science and Language Arts Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Standardized Test Practice
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 1 The Nature of Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 2 Science Technology and Society
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 3 Motion Acceleration and Forces
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 4 The Laws of Motion
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 5 Energy
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 6 Work and Machines
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 8 The Solar System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 9 Heat and States of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 10 Waves
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 11 Sound and Light
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 26 Stars and Galaxies
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Page 29: 706 S1 318-326 GPS09 - Light-and-Sound - home · PDF fileWhat sound does a ruler make? ... sound waves cannot travel in empty space where there are no particles. ... sound travels

346 CHAPTER 11 Sound and Light

A Haiku GardenThe Four Seasons in Poems and Prints

by Stephen Addiss with Fumiko and Akira Yamamoto

Respond to the Reading1 How do the illustrations help the reader

better understand the poems2 What do you think is meant by the

word lingering in the Haiku about springsunlight

3 Linking Science and Writing Writeone haiku about summer and anotherabout fall In one poem use color tohelp you describe the season In theother use light or some property oflight to help describe the season

Research has deter-mined that there is a

connection between color and mood Warmcolors have longer wavelengths and can bemore stimulating Cool colors which haveshorter wavelengths tend to have a calmingor soothing effect on people Light and colorhave long been used as literary symbols Doesthe use of color change what you imaginewhen you read the haiku

UnderstandingLiteratureJapanese Haiku A haiku is a verse thatconsists of three lines and 17 syllables inthe Japanese language The first and thirdlines have five syllables each and themiddle line has seven syllables Why isimagination important in reading haiku

Lingering

in every pool of watermdash

spring sunlightIssa

Withered by winter

the sound of the windmdash

one-color worldBasho

Sound

1 Sound waves are compressional waves thattravel only in matter

2 The speed of sound in a material dependson the type of material as well as itstemperature

3 Loudness depends on a sound waversquos inten-sity Pitch depends on a sound waversquosfrequency

4 Sound waves are used in echolocationsonar and medical imaging

Reflection and Refractionof Light

1 Light can be absorbed reflected or trans-mitted by a material

2 When light waves are reflected theyobey the law of reflectionmdashthe angle ofincidence equals the angle of reflection

3 A light wave is refracted or bent whenit changes speed as it travels at an anglefrom one material to another

Mirrors Lenses andthe Eye

1 Plane mirrors form upright virtual images

2 Images formed by concave mirrors andconvex lenses depend on the location ofthe object relative to the focal point

3 Convex mirrors and concave lenses formvirtual upright images that are smallerthan the object

4 The lens in the human eye changes shape toproduce a sharp image on the retina

Light and Color

1 You see color when light is reflected offobjects and into your eyes

2 Cone cells in the retina are light-sensitivecells that enable you to distinguish colors

3 Red blue and green are the three primarycolors of light and can be mixed to form allother colors

4 The primary pigment colors are magentacyan and yellow

CHAPTER STUDY GUIDE 347

Use the Foldable you made at the beginningof the chapter to help you review sound and light

Interactive Tutor gpesciencecom

Complete each statement with the correctvocabulary word or phrase

1 A change in frequency due to a movingsound source is due to the

2 A flat smooth surface that reflects light andforms an image is a(n)

3 An object is if you can seethrough it clearly

4 The of a material indicates howmuch the speed of light in the materialchanges as light passes through

5 You can change the color of white paint byadding a(n) to it

6 A(n) is a reflecting surface thatcurves outward like the back of a spoon

7 The human perception of the intensity of asound wave is

Choose the word or phrase that best answerseach question

8 Which of the following best describes imageformation by a plane mirrorA) A real image is formed in front of the mirrorB) A real image is formed behind the mirrorC) A virtual image is formed in front of the

mirrorD) A virtual image is formed behind the mirror

9 For a sound with low pitch what else isalso always lowA) amplitude C) wavelengthB) frequency D) wave velocity

10 Which of the following occurs when asound source moves away from youA) The soundrsquos velocity decreasesB) The soundrsquos loudness increasesC) The soundrsquos frequency decreasesD) The soundrsquos frequency increases

Use the table below to answer question 11

11 Based on the data in the table abovewhich of the following would be the speedof sound in air at 30degCA) 3404 ms C) 3494 msB) 3464 ms D) 3534 ms

12 What happens to a light ray travelingparallel to the optical axis of a convexlens that passes through the lensA) It travels parallel to the optical axisB) It passes through the focal pointC) It is bent away from the optical axisD) It forms a virtual image

13 Light waves of which color are bent mostwhen passing through a prismA) blue C) violetB) red D) yellow

14 Which way does a concave lens bend lightA) toward its optical axisB) toward its centerC) toward its edgesD) toward its focal point

Speed of Sound in Air

Temp peed( s)

4

4

4

348 CHAPTER REVIEW

concave lens p 335concave mirror p 332convex lens p 333convex mirror p 333decibel p 322Doppler effect p 323index of refraction p 329intensity p 322

loudness p 322opaque p 327pigment p 342pitch p 323plane mirror p 331translucent p 327transparent p 327

Vocabulary PuzzleMaker gpesciencecom

Use the illustration below to answer question 15

15 Describe how the position of the candlechanged if the image of the candle movedaway from the focal point

16 Apply Acoustic scientists sometimes doresearch in rooms that absorb all soundwaves How could such a room be used tostudy how bats find their food

17 Compare White light passes through atranslucent pane of glass and shines on ashirt Both the translucent glass and theshirt appear green Compare the colors oflight that are absorbed and transmitted bythe glass and the shirt

18 Infer Most mammals including dogs andcats canrsquot see colors Infer how the retinaof a catrsquos eye might be different from theretina of a human eye

19 Determine whether a convex lens could forman image that is enlarged real and upright

20 Infer A car comes to a railroad crossingThe driver hears a trainrsquos whistle and itspitch becomes lower What can beassumed about how the train is moving

21 Compare and contrast the reflection of lightfrom a white wall with a rough surfacewith the reflection of light from a mirror

Optical axis

One

focal

length

Two

focal

lengths

Image

Ray A

Object

Focal

point

Interpreting Graphics 22 Infer why a convex mirror and a concavelens can never produce a real image

23 Predict what color a white shirt wouldappear to be if the light reflected from theshirt passed through a red filter and thenthrough a green filter

24 Explain why windows might begin to rattlewhen an airplane flies overhead

25 Communicate Some people enjoy usingsnowmobiles Others object to the noisethat they make Write a proposal for a pol-icy that seems fair to both groups for theuse of snowmobiles in a state park

CHAPTER REVIEW 349

Use the wave speed equation ν ƒλ to answer

questions 26 and 27

26 Calculate Frequency A sonar pulse has awavelength of 30 cm and a speed inwater of 1500 ms Find its frequency

27 Calculate Wavelength What is the wave-length of a sound wave with a fre-quency of 440 Hz if the speed of soundin air is 340 ms

28 Calculate Angle of Incidence A light ray isreflected from a mirror If the anglebetween the incident ray and thereflected ray is 136deg what is the angleof incidence

29 Determine Object Distance You hold anobject in front of a concave mirror witha focal length of 30 cm If you do notsee a reflected image how far from themirror is the object

30 Calculate Speed The speed of light in avacuum is 300000 kms If the index ofrefraction of water is 133 what is thespeed of light in water

More Chapter Review gpesciencecom

1 Which of the following describes the imageformed by a convex mirror

A enlarged

B inverted

C real

D virtual

Use the figure below to answer question 2

2 Which of the following describes a light raythat passes through the focal point andthen is reflected by the mirror

A It travels parallel to the optical axis

B It forms a real image

C It is reflected back through the focal point

D It forms a virtual image

3 Why does an apple look red

A It reflects red light

B It absorbs red light

C It reflects green and blue light

D It reflects all colors of light except red

Use the figure below to answer questions 4 and 5

4 When the primary colors of light are addedtogether what color appears in area H

A cyan

B magenta

C white

D yellow

5 When the primary colors of light are addedtogether what color appears in area G

A cyan

B magenta

C white

D yellow

6 Which of the following increases as the fre-quency of a sound increases

A amplitude

B intensity

C loudness

D pitch

Red Blue

Green

F

H

G K

Focal pointOptical axis

350 STANDARDIZED TEST PRACTICE

Record your answers on the answer sheet provided by your teacher or on a sheet of paper

STANDARDIZED TEST PRACTICE 351

7 Which of the following parts of the eyeenable you to see colors in bright light

A cone cells

B cornea

C lens

D rod cells

Use the graph below to answer questions 8 and 9

8 Determine how far in centimeters theimage is from the lens when the object is15 centimeters from the lens

9 How far in centimeters is the object fromthe lens when the image distance andobject distance are equal

10 A shirt has stripes that are black and whitein white light If green light shines on thisshirt what colors will the black and whitestripes be

11 If you are on a moving train what hap-pens to the pitch of a crossing bell as youapproach the crossing and then moveaway from the crossing

Use the figure below to answer question 12

12 Describe the vision problem show by thefigure and explain how this vision prob-lem can be corrected

13 Explain why the human eye can see colorsbetter in bright light than in dim light

Image Distance fora Convex Lens

Ima

ge

dis

tan

ce (

cm)

30

25

20

15

10

5 10 15 20 25 30

Object distance (cm)

Standardized Test Practice gpesciencecom

Note Units Read carefully and make note of the units used in

any measurement

  • Glencoe Physical Science with Earth Science
    • Student Edition Table of Contents
      • Unit 1 Science and Technology
        • Chapter 1 The Nature of Science
          • Launch Lab Understanding Measurements
          • Foldables
          • Section 1 The Methods of Science
            • Science Online
            • Integrate History
            • Integrate Earth Science
            • Science Online
              • Section 2 Standards of Measurement
                • Applying Math Centimeters
                • Integrate Earth Science
                • Science Online
                • MiniLAB Determining the Density of a Pencil
                • Visualizing SI Dimensions
                  • Section 3 Communicating with Graphs
                    • Applying Math Temperature
                    • MiniLAB Graphing Temperature Change
                    • Lab Whats my graph
                    • Lab Design Your Own - Developing a Measurement System
                    • Science and Language Arts Thinking in Pictures and Other Reports from My Life with Autism
                      • Chapter 1 Study Guide
                      • Chapter 1 Review
                      • Chapter 1 Standardized Test Practice
                        • Chapter 2 Science Technology and Society
                          • Lab Technology in Your Life
                          • Foldables
                          • Section 1 Science and Technology
                            • MiniLAB Researching the Past
                            • Visualizing Technology Supplying Basic Needs
                            • Science Online
                              • Section 2 Forces that Shape Technology
                                • MiniLAB Evaluating the Benefits and Consequences of Technology
                                • Integrate Environment
                                • Integrate History
                                • Applying Science What impact does the accident at Chernobyl have on the future of nuclear power
                                • Science Online
                                • Lab Who contributes CO2
                                  • Section 3 Developing Technology
                                    • Integrate Life Science
                                    • Integrate Career
                                    • Lab Model and Invent - Care Package
                                    • Oops Accidents in Science A Slippery Situation
                                      • Chapter 2 Study Guide
                                      • Chapter 2 Review
                                      • Chapter 2 Standardized Test Practice
                                          • Unit 2 Motion Forces and Energy
                                            • Chapter 3 Motion Acceleration and Forces
                                              • Launch Lab Compare Speeds
                                              • Foldables
                                              • Section 1 Describing Motion
                                                • MiniLAB Measuring Average Speed
                                                • Science Online
                                                • Applying Math Average Speed
                                                • Integrate Astronomy
                                                • Science Online
                                                  • Section 2 Acceleration
                                                    • Integrate History
                                                    • Visualizing Acceleration
                                                      • Section 3 Motion and Forces
                                                        • Science Online
                                                        • MiniLAB Comparing Friction
                                                        • Lab Force and Acceleration
                                                        • Lab Design Your Own - Comparing Motion from Different Forces
                                                        • Science and Language Arts A Brave and Startling Truth
                                                          • Chapter 3 Study Guide
                                                          • Chapter 3 Review
                                                          • Chapter 3 Standardized Test Practice
                                                            • Chapter 4 The Laws of Motion
                                                              • Launch Lab The Force of Gravity
                                                              • Foldables
                                                              • Section 1 The First Two Laws of Motion
                                                                • MiniLAB Observing Inertia
                                                                • Science Online
                                                                • Applying Math The Acceleration of a Sled Solve a Simple Equation
                                                                  • Section 2 Gravity
                                                                    • Science Online
                                                                    • Integrate Earth Science
                                                                    • MiniLAB Observing Centripetal Force
                                                                    • Lab Gravity and Air Resistance
                                                                      • Section 3 The Third Law of Motion
                                                                        • Integrate Career
                                                                        • Visualizing Rocket Motion
                                                                        • Applying Math The Momentum of a Sprinter
                                                                        • Lab The Momentum of Colliding Objects
                                                                        • Science and History Newton and the Plague
                                                                          • Chapter 4 Study Guide
                                                                          • Chapter 4 Review
                                                                          • Chapter 4 Standardized Test Practice
                                                                            • Chapter 5 Energy
                                                                              • Launch Lab Energy Conversions
                                                                              • Foldables
                                                                              • Section 1 The Nature of Energy
                                                                                • Science Online
                                                                                • Applying Math Kinetic Energy
                                                                                • MiniLAB Interpreting Data from a Slingshot
                                                                                • Integrate Language Arts
                                                                                • Applying Math Gravitational Potential Energy
                                                                                • Lab Bouncing Balls
                                                                                  • Section 2 Conservation of Energy
                                                                                    • Visualizing Energy Transformations
                                                                                    • Integrate Environment
                                                                                    • MiniLAB Transforming Energy in a Paper Clip
                                                                                    • Science Online
                                                                                    • Integrate Health
                                                                                    • Lab Design Your Own - Swinging Energy
                                                                                    • Science and History The Impossible Dream
                                                                                      • Chapter 5 Study Guide
                                                                                      • Chapter 5 Review
                                                                                      • Chapter 5 Standardized Test Practice
                                                                                        • Chapter 6 Work and Machines
                                                                                          • Launch Lab Doing Work with a Simple Machine
                                                                                          • Foldables
                                                                                          • Section 1 Work
                                                                                            • Integrate Language Arts
                                                                                            • Applying Math Work
                                                                                            • MiniLAB Calculating Your Work and Power
                                                                                            • Applying Math Power
                                                                                              • Section 2 Using Machines
                                                                                                • MiniLAB Machines Multiplying Force
                                                                                                • Science Online
                                                                                                • Integrate Chemistry
                                                                                                  • Section 3 Simple Machines
                                                                                                    • Integrate History
                                                                                                    • Visualizing Levers in the Human Body
                                                                                                    • Science Online
                                                                                                    • Lab Levers
                                                                                                    • Lab Model and Invent - Using Simple Machines
                                                                                                    • Science and Society The Science of Very Very Small
                                                                                                      • Chapter 6 Study Guide
                                                                                                      • Chapter 6 Review
                                                                                                      • Chapter 6 Standardized Test Practice
                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                          • Launch Lab Relative Sizes of Earth the Moon and the Sun
                                                                                                          • Foldables
                                                                                                          • Section 1 Earth in Space
                                                                                                            • Science Online
                                                                                                            • Integrate Physics
                                                                                                              • Section 2 Time and Seasons
                                                                                                                • MiniLAB Modeling the Suns Rays at Solstice
                                                                                                                • Lab Comparing the Angle of Sunlight to Intensity
                                                                                                                  • Section 3 Earths Moon
                                                                                                                    • Applying Math Tides
                                                                                                                    • MiniLAB Modeling Phases and Eclipses
                                                                                                                    • Integrate History
                                                                                                                    • Integrate History
                                                                                                                    • Science Online
                                                                                                                    • Visualizing Water on the Moon
                                                                                                                    • Lab Identifying the Moons Surface Features and Apollo Landing Sites
                                                                                                                    • Oops Accidents in Science Even Great Scientists Make Mistakes
                                                                                                                      • Chapter 7 Study Guide
                                                                                                                      • Chapter 7 Review
                                                                                                                      • Chapter 7 Standardized Test Practice
                                                                                                                        • Chapter 8 The Solar System
                                                                                                                          • Launch Lab The Size of the Solar System
                                                                                                                          • Foldables
                                                                                                                          • Section 1 Planet Motion
                                                                                                                            • Integrate History
                                                                                                                            • MiniLAB Plotting Retrograde Motion
                                                                                                                            • Integrate Physics
                                                                                                                            • Applying Math Heliocentric Longitude (HL)
                                                                                                                              • Section 2 The Inner Planets
                                                                                                                                • Science Online
                                                                                                                                • Integrate Chemistry
                                                                                                                                • Lab Interpreting Features of Marss Surface
                                                                                                                                  • Section 3 The Outer Planets
                                                                                                                                    • Integrate Language Arts
                                                                                                                                    • Visualizing What Galileo Saw
                                                                                                                                    • Science Online
                                                                                                                                    • MiniLAB Comparing Sizes of Outer and Inner Planets
                                                                                                                                      • Section 4 Life in the Solar System
                                                                                                                                        • Lab Design Your Own - Testing Unknown Soil Samples for Life
                                                                                                                                        • Science Stats Night Sky Wonders
                                                                                                                                          • Chapter 8 Study Guide
                                                                                                                                          • Chapter 8 Review
                                                                                                                                          • Chapter 8 Standardized Test Practice
                                                                                                                                              • Unit 3 Energy in Motion
                                                                                                                                                • Chapter 9 Heat and States of Matter
                                                                                                                                                  • Launch Lab Expansion of a Gas
                                                                                                                                                  • Foldables
                                                                                                                                                  • Section 1 Temperature and Thermal Energy
                                                                                                                                                    • Applying Math Converting to Celsius
                                                                                                                                                    • Science Online
                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                    • Applying Math Change in Thermal Energy
                                                                                                                                                      • Section 2 States of Matter
                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                        • Science Online
                                                                                                                                                        • MiniLAB Comparing States of Water
                                                                                                                                                          • Section 3 Transferring Thermal Energy
                                                                                                                                                            • MiniLAB Comparing Thermal Conductors
                                                                                                                                                            • Visualizing Convection Currents
                                                                                                                                                            • Lab Convection in Gases and Liquids
                                                                                                                                                              • Section 4 Using Thermal Energy
                                                                                                                                                                • Integrate History
                                                                                                                                                                • Science Online
                                                                                                                                                                • Lab Conduction in Gases
                                                                                                                                                                • Science Stats Surprising Thermal Energy
                                                                                                                                                                  • Chapter 9 Study Guide
                                                                                                                                                                  • Chapter 9 Review
                                                                                                                                                                  • Chapter 9 Standardized Test Practice
                                                                                                                                                                    • Chapter 10 Waves
                                                                                                                                                                      • Launch Lab How do waves transfer energy
                                                                                                                                                                      • Foldables
                                                                                                                                                                      • Section 1 The Nature of Waves
                                                                                                                                                                        • Visualizing Formation of Ocean Waves
                                                                                                                                                                        • Science Online
                                                                                                                                                                          • Section 2 Wave Properties
                                                                                                                                                                            • MiniLAB Observing Wavelength
                                                                                                                                                                            • Integrate Social Studies
                                                                                                                                                                            • Applying Math The Speed of Sound
                                                                                                                                                                            • Lab Wave Speed and Tension
                                                                                                                                                                              • Section 3 The Behavior of Waves
                                                                                                                                                                                • Science Online
                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                • MiniLAB Experimenting with Resonance
                                                                                                                                                                                • Lab Measuring Wave Properties
                                                                                                                                                                                • Science and History Making Waves
                                                                                                                                                                                  • Chapter 10 Study Guide
                                                                                                                                                                                  • Chapter 10 Review
                                                                                                                                                                                  • Chapter 10 Standardized Test Practice
                                                                                                                                                                                    • Chapter 11 Sound and Light
                                                                                                                                                                                      • Launch Lab What sound does a ruler make
                                                                                                                                                                                      • Foldables
                                                                                                                                                                                      • Section 1 Sound
                                                                                                                                                                                        • MiniLAB Comparing Intensity
                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                        • Science Online
                                                                                                                                                                                        • Applying Math Using Sonar
                                                                                                                                                                                          • Section 2 Reflection and Refraction of Light
                                                                                                                                                                                          • Section 3 Mirrors Lenses and the Eye
                                                                                                                                                                                            • Visualizing Images Formed by a Convex Lens
                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                            • MiniLAB Experimenting with Focal Lengths
                                                                                                                                                                                            • Lab Reflections of Reflections
                                                                                                                                                                                              • Section 4 Light and Color
                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Lab Design Your Own - Blocking Noise Pollution
                                                                                                                                                                                                • Science and Language Arts A Haiku Garden The Four Seasons in Poems and Print
                                                                                                                                                                                                  • Chapter 11 Study Guide
                                                                                                                                                                                                  • Chapter 11 Review
                                                                                                                                                                                                  • Chapter 11 Standardized Test Practice
                                                                                                                                                                                                    • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                      • Launch Lab Global Jigsaw Puzzle
                                                                                                                                                                                                      • Foldables
                                                                                                                                                                                                      • Section 1 Evolution of Earths Crust
                                                                                                                                                                                                        • Applying Math Spreading Distances
                                                                                                                                                                                                        • Integrate Physics
                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                          • Section 2 Earthquakes
                                                                                                                                                                                                            • MiniLAB Demonstrating Four Types of Stress
                                                                                                                                                                                                            • Visualizing Earthquake-Proof Buildings
                                                                                                                                                                                                              • Section 3 Earths Interior
                                                                                                                                                                                                              • Section 4 Volcanoes
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • MiniLAB Modeling Lava Viscosity
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                • Lab A Case for Pacific Plate Motion
                                                                                                                                                                                                                • Lab Earthquake Earthquake Wheres the earthquake
                                                                                                                                                                                                                • Science and History Volcano Weather
                                                                                                                                                                                                                  • Chapter 12 Study Guide
                                                                                                                                                                                                                  • Chapter 12 Review
                                                                                                                                                                                                                  • Chapter 12 Standardized Test Practice
                                                                                                                                                                                                                      • Unit 4 Forms of Energy
                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                          • Launch Lab Electric Circuits
                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                          • Section 1 Electric Charge
                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                            • Visualizing Lightning
                                                                                                                                                                                                                            • MiniLAB Investigate Charged Objects
                                                                                                                                                                                                                              • Section 2 Electric Current
                                                                                                                                                                                                                                • MiniLAB Investigating Battery Addition
                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                • Lab Identifying Conductors and Insulators
                                                                                                                                                                                                                                  • Section 3 Electrical Energy
                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                    • Applying Math Power Used by a Clothes Dryer
                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                    • Applying Math Electrical Energy Used by a Microwave Oven
                                                                                                                                                                                                                                    • Lab Design Your Own - Comparing Series and Parallel Circuits
                                                                                                                                                                                                                                    • Science and Language Arts Invisible Man
                                                                                                                                                                                                                                      • Chapter 13 Study Guide
                                                                                                                                                                                                                                      • Chapter 13 Review
                                                                                                                                                                                                                                      • Chapter 13 Standardized Test Practice
                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                          • Launch Lab The Strength of Magnets
                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                          • Section 1 Magnetism
                                                                                                                                                                                                                                            • MiniLAB Observing Magnetic Interference
                                                                                                                                                                                                                                            • Integrate Earth Science
                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                            • Applying Science How can magnetic parts of a junk car be salvaged
                                                                                                                                                                                                                                            • MiniLAB Making Your Own Compass
                                                                                                                                                                                                                                              • Section 2 Electricity and Magnetism
                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                  • Section 3 Producing Electric Current
                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                    • Visualizing Motors and Generators
                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                    • Lab Electricity and Magnetism
                                                                                                                                                                                                                                                    • Lab Design Your Own - Controlling Electromagnets
                                                                                                                                                                                                                                                    • Science and History Body Art
                                                                                                                                                                                                                                                      • Chapter 14 Study Guide
                                                                                                                                                                                                                                                      • Chapter 14 Review
                                                                                                                                                                                                                                                      • Chapter 14 Standardized Test Practice
                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                          • Launch Lab Can electromagnetic waves change materials
                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                          • Section 1 What are electromagnetic waves
                                                                                                                                                                                                                                                            • MiniLAB Investigating Electromagnetic Waves
                                                                                                                                                                                                                                                            • Applying Math The Speed of Light in Water
                                                                                                                                                                                                                                                              • Section 2 The Electromagnetic Spectrum
                                                                                                                                                                                                                                                                • MiniLAB Heating with Microwaves
                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                • Lab The Shape of Satellite Dishes
                                                                                                                                                                                                                                                                  • Section 3 Radio Communication
                                                                                                                                                                                                                                                                    • Visualizing Radio Broadcasts
                                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Lab Use the Internet - Radio Frequencies
                                                                                                                                                                                                                                                                    • Science and History Riding a Beam of Light
                                                                                                                                                                                                                                                                      • Chapter 15 Study Guide
                                                                                                                                                                                                                                                                      • Chapter 15 Review
                                                                                                                                                                                                                                                                      • Chapter 15 Standardized Test Practice
                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                          • Launch Lab Heating with Solar Energy
                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                          • Section 1 Fossil Fuels
                                                                                                                                                                                                                                                                            • Visualizing The Formation of Fossil Fuels
                                                                                                                                                                                                                                                                            • MiniLAB Designing an Efficient Water Heater
                                                                                                                                                                                                                                                                              • Section 2 Nuclear Energy
                                                                                                                                                                                                                                                                                • Integrate Earth Science
                                                                                                                                                                                                                                                                                • Integrate Social Science
                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                • Applying Science Can a contaminated radioactive site be reclaimed
                                                                                                                                                                                                                                                                                  • Section 3 Renewable Energy Sources
                                                                                                                                                                                                                                                                                    • MiniLAB Using Solar Power at Home
                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                    • Lab Solar Heating
                                                                                                                                                                                                                                                                                    • Lab Use the Internet How much does energy really cost
                                                                                                                                                                                                                                                                                    • Science and Society Reacting to Nuclear Energy
                                                                                                                                                                                                                                                                                      • Chapter 16 Study Guide
                                                                                                                                                                                                                                                                                      • Chapter 16 Review
                                                                                                                                                                                                                                                                                      • Chapter 16 Standardized Test Practice
                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                          • Lab Atmospheric Pressure
                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                          • Section 1 Earths Atmosphere
                                                                                                                                                                                                                                                                                            • MiniLAB Visualizing Convection
                                                                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                                                                            • Lab Visualizing a Temperature Inversion
                                                                                                                                                                                                                                                                                              • Section 2 Weather
                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Coriolis Effect
                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                  • Section 3 Climate
                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                    • Visualizing Earths Biogeophysical System
                                                                                                                                                                                                                                                                                                      • Section 4 Earths Changing Climates
                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                        • Applying Math Carbon Dioxide (CO2) Concentration
                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Investigating Microclimate
                                                                                                                                                                                                                                                                                                        • Science and Language Arts The Grapes of Wrath
                                                                                                                                                                                                                                                                                                          • Chapter 17 Study Guide
                                                                                                                                                                                                                                                                                                          • Chapter 17 Review
                                                                                                                                                                                                                                                                                                          • Chapter 17 Standardized Test Practice
                                                                                                                                                                                                                                                                                                              • Unit 5 Matter and Earth Materials
                                                                                                                                                                                                                                                                                                                • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                  • Launch Lab Demonstrate the Distillation of Water
                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                  • Section 1 Composition of Matter
                                                                                                                                                                                                                                                                                                                    • Visualizing Elements
                                                                                                                                                                                                                                                                                                                    • MiniLAB Classifying Materials
                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                    • Lab Comparing Pure Substances and Mixtures
                                                                                                                                                                                                                                                                                                                      • Section 2 Properties of Matter
                                                                                                                                                                                                                                                                                                                        • Integrate Environment
                                                                                                                                                                                                                                                                                                                        • MiniLAB Separating Ink
                                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                                        • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                        • Applying Math The Law of Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Measuring the Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Science Stats Intriguing Elements
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Study Guide
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Review
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                            • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                              • Launch Lab Inferring What You Cant Observe
                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                              • Section 1 Structure of the Atom
                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling an Aluminum Atom
                                                                                                                                                                                                                                                                                                                                • Visualizing The Atomic Model
                                                                                                                                                                                                                                                                                                                                  • Section 2 Masses of Atoms
                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                    • Applying Science How can radioactive isotopes help tell time
                                                                                                                                                                                                                                                                                                                                      • Section 3 The Periodic Table
                                                                                                                                                                                                                                                                                                                                        • MiniLAB Organizing a Personal Periodic Table
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Career
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                                                                                                                                                                        • Lab A Periodic Table of Foods
                                                                                                                                                                                                                                                                                                                                        • Lab Use the Internet Whats in a name
                                                                                                                                                                                                                                                                                                                                        • Science and History A Chilling Story
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Study Guide
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Review
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                            • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                              • Launch Lab Earth Materials at Home and School
                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                              • Section 1 Minerals
                                                                                                                                                                                                                                                                                                                                                • MiniLAB Identifying Salts Crystal System
                                                                                                                                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                • Lab Be a Mineral Detective
                                                                                                                                                                                                                                                                                                                                                  • Section 2 Igneous Rocks
                                                                                                                                                                                                                                                                                                                                                    • Applying Math Extrusive Igneous Rock Classification
                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                      • Section 3 Sedimentary Rocks
                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Evaporites
                                                                                                                                                                                                                                                                                                                                                          • Section 4 Metamorphic Rocks and the Rock Cycle
                                                                                                                                                                                                                                                                                                                                                            • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                            • Visualizing Shock Metamorphic Rock
                                                                                                                                                                                                                                                                                                                                                            • Lab Identifying Rocks
                                                                                                                                                                                                                                                                                                                                                            • Science and Society Earth Materials at Work
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Study Guide
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Review
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                  • Launch Lab Have you got the time
                                                                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                                                                  • Section 1 Weathering and Soil
                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing a Disappearing Seasoning
                                                                                                                                                                                                                                                                                                                                                                    • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                    • Lab Graphing Soil Textures
                                                                                                                                                                                                                                                                                                                                                                      • Section 2 Shaping the Landscape
                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Runoff
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                          • Section 3 Groundwater
                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Porosity Volume
                                                                                                                                                                                                                                                                                                                                                                            • Visualizing The Role of Groundwater in Shaping Earths Surface
                                                                                                                                                                                                                                                                                                                                                                            • Integrate Environment
                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                              • Section 4 Geologic Time
                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                                                                                                • Lab Its about time - relative that is
                                                                                                                                                                                                                                                                                                                                                                                • Science and Society Tapping into the Underground
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Review
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                      • Unit 6 Interactions of Matter
                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                          • Lab Chemical Bonds and Mixing
                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Stability in Bonding
                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                            • Lab Atomic Trading Cards
                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Types of Bonds
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Observing a Bond Type
                                                                                                                                                                                                                                                                                                                                                                                                • Visualizing Polar Molecules
                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Writing Formulas and Naming Compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math Determining a Formula
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Science Can you name binary ionic compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Making a Hydrate
                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Model and Invent - Modeling Chemical Bonding
                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Sticky Subject
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Review
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab RustingmdashA Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Chemical Changes
                                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Designing a Team Equation
                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Chemical Equations
                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math Barium Sulfate Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Classifying Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 4 Reaction Rates and Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing Chemical Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Creating a Colorful Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab To Glow or Not to Glow
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Investigating Reaction Conditions
                                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Clumsy Move Pays Off
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Review
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab Magic Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 How Solutions Form
                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                                                                                                                                                                                                                                                            • Visualizing Metal Alloys
                                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Observing the Effect of Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Solubility and Concentration
                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Acids Bases and Salts
                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing Acid Relief
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Strength of Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Determining Acidity
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Saturated Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and Society Acid Rain
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab The Size of a Nucleus
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Strong Force
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Nuclear Decay
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Detecting Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math The Age of Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Social Studies
                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Nuclear Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling a Nuclear Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Visualizing PET Scans
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Chain Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Model and Invent Modeling Transmutations
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and History The Nuclear Alchemist
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 26 Stars and Galaxies
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab Stars in the Sky
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Observing the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling a Telescope
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
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Page 30: 706 S1 318-326 GPS09 - Light-and-Sound - home · PDF fileWhat sound does a ruler make? ... sound waves cannot travel in empty space where there are no particles. ... sound travels

Sound

1 Sound waves are compressional waves thattravel only in matter

2 The speed of sound in a material dependson the type of material as well as itstemperature

3 Loudness depends on a sound waversquos inten-sity Pitch depends on a sound waversquosfrequency

4 Sound waves are used in echolocationsonar and medical imaging

Reflection and Refractionof Light

1 Light can be absorbed reflected or trans-mitted by a material

2 When light waves are reflected theyobey the law of reflectionmdashthe angle ofincidence equals the angle of reflection

3 A light wave is refracted or bent whenit changes speed as it travels at an anglefrom one material to another

Mirrors Lenses andthe Eye

1 Plane mirrors form upright virtual images

2 Images formed by concave mirrors andconvex lenses depend on the location ofthe object relative to the focal point

3 Convex mirrors and concave lenses formvirtual upright images that are smallerthan the object

4 The lens in the human eye changes shape toproduce a sharp image on the retina

Light and Color

1 You see color when light is reflected offobjects and into your eyes

2 Cone cells in the retina are light-sensitivecells that enable you to distinguish colors

3 Red blue and green are the three primarycolors of light and can be mixed to form allother colors

4 The primary pigment colors are magentacyan and yellow

CHAPTER STUDY GUIDE 347

Use the Foldable you made at the beginningof the chapter to help you review sound and light

Interactive Tutor gpesciencecom

Complete each statement with the correctvocabulary word or phrase

1 A change in frequency due to a movingsound source is due to the

2 A flat smooth surface that reflects light andforms an image is a(n)

3 An object is if you can seethrough it clearly

4 The of a material indicates howmuch the speed of light in the materialchanges as light passes through

5 You can change the color of white paint byadding a(n) to it

6 A(n) is a reflecting surface thatcurves outward like the back of a spoon

7 The human perception of the intensity of asound wave is

Choose the word or phrase that best answerseach question

8 Which of the following best describes imageformation by a plane mirrorA) A real image is formed in front of the mirrorB) A real image is formed behind the mirrorC) A virtual image is formed in front of the

mirrorD) A virtual image is formed behind the mirror

9 For a sound with low pitch what else isalso always lowA) amplitude C) wavelengthB) frequency D) wave velocity

10 Which of the following occurs when asound source moves away from youA) The soundrsquos velocity decreasesB) The soundrsquos loudness increasesC) The soundrsquos frequency decreasesD) The soundrsquos frequency increases

Use the table below to answer question 11

11 Based on the data in the table abovewhich of the following would be the speedof sound in air at 30degCA) 3404 ms C) 3494 msB) 3464 ms D) 3534 ms

12 What happens to a light ray travelingparallel to the optical axis of a convexlens that passes through the lensA) It travels parallel to the optical axisB) It passes through the focal pointC) It is bent away from the optical axisD) It forms a virtual image

13 Light waves of which color are bent mostwhen passing through a prismA) blue C) violetB) red D) yellow

14 Which way does a concave lens bend lightA) toward its optical axisB) toward its centerC) toward its edgesD) toward its focal point

Speed of Sound in Air

Temp peed( s)

4

4

4

348 CHAPTER REVIEW

concave lens p 335concave mirror p 332convex lens p 333convex mirror p 333decibel p 322Doppler effect p 323index of refraction p 329intensity p 322

loudness p 322opaque p 327pigment p 342pitch p 323plane mirror p 331translucent p 327transparent p 327

Vocabulary PuzzleMaker gpesciencecom

Use the illustration below to answer question 15

15 Describe how the position of the candlechanged if the image of the candle movedaway from the focal point

16 Apply Acoustic scientists sometimes doresearch in rooms that absorb all soundwaves How could such a room be used tostudy how bats find their food

17 Compare White light passes through atranslucent pane of glass and shines on ashirt Both the translucent glass and theshirt appear green Compare the colors oflight that are absorbed and transmitted bythe glass and the shirt

18 Infer Most mammals including dogs andcats canrsquot see colors Infer how the retinaof a catrsquos eye might be different from theretina of a human eye

19 Determine whether a convex lens could forman image that is enlarged real and upright

20 Infer A car comes to a railroad crossingThe driver hears a trainrsquos whistle and itspitch becomes lower What can beassumed about how the train is moving

21 Compare and contrast the reflection of lightfrom a white wall with a rough surfacewith the reflection of light from a mirror

Optical axis

One

focal

length

Two

focal

lengths

Image

Ray A

Object

Focal

point

Interpreting Graphics 22 Infer why a convex mirror and a concavelens can never produce a real image

23 Predict what color a white shirt wouldappear to be if the light reflected from theshirt passed through a red filter and thenthrough a green filter

24 Explain why windows might begin to rattlewhen an airplane flies overhead

25 Communicate Some people enjoy usingsnowmobiles Others object to the noisethat they make Write a proposal for a pol-icy that seems fair to both groups for theuse of snowmobiles in a state park

CHAPTER REVIEW 349

Use the wave speed equation ν ƒλ to answer

questions 26 and 27

26 Calculate Frequency A sonar pulse has awavelength of 30 cm and a speed inwater of 1500 ms Find its frequency

27 Calculate Wavelength What is the wave-length of a sound wave with a fre-quency of 440 Hz if the speed of soundin air is 340 ms

28 Calculate Angle of Incidence A light ray isreflected from a mirror If the anglebetween the incident ray and thereflected ray is 136deg what is the angleof incidence

29 Determine Object Distance You hold anobject in front of a concave mirror witha focal length of 30 cm If you do notsee a reflected image how far from themirror is the object

30 Calculate Speed The speed of light in avacuum is 300000 kms If the index ofrefraction of water is 133 what is thespeed of light in water

More Chapter Review gpesciencecom

1 Which of the following describes the imageformed by a convex mirror

A enlarged

B inverted

C real

D virtual

Use the figure below to answer question 2

2 Which of the following describes a light raythat passes through the focal point andthen is reflected by the mirror

A It travels parallel to the optical axis

B It forms a real image

C It is reflected back through the focal point

D It forms a virtual image

3 Why does an apple look red

A It reflects red light

B It absorbs red light

C It reflects green and blue light

D It reflects all colors of light except red

Use the figure below to answer questions 4 and 5

4 When the primary colors of light are addedtogether what color appears in area H

A cyan

B magenta

C white

D yellow

5 When the primary colors of light are addedtogether what color appears in area G

A cyan

B magenta

C white

D yellow

6 Which of the following increases as the fre-quency of a sound increases

A amplitude

B intensity

C loudness

D pitch

Red Blue

Green

F

H

G K

Focal pointOptical axis

350 STANDARDIZED TEST PRACTICE

Record your answers on the answer sheet provided by your teacher or on a sheet of paper

STANDARDIZED TEST PRACTICE 351

7 Which of the following parts of the eyeenable you to see colors in bright light

A cone cells

B cornea

C lens

D rod cells

Use the graph below to answer questions 8 and 9

8 Determine how far in centimeters theimage is from the lens when the object is15 centimeters from the lens

9 How far in centimeters is the object fromthe lens when the image distance andobject distance are equal

10 A shirt has stripes that are black and whitein white light If green light shines on thisshirt what colors will the black and whitestripes be

11 If you are on a moving train what hap-pens to the pitch of a crossing bell as youapproach the crossing and then moveaway from the crossing

Use the figure below to answer question 12

12 Describe the vision problem show by thefigure and explain how this vision prob-lem can be corrected

13 Explain why the human eye can see colorsbetter in bright light than in dim light

Image Distance fora Convex Lens

Ima

ge

dis

tan

ce (

cm)

30

25

20

15

10

5 10 15 20 25 30

Object distance (cm)

Standardized Test Practice gpesciencecom

Note Units Read carefully and make note of the units used in

any measurement

  • Glencoe Physical Science with Earth Science
    • Student Edition Table of Contents
      • Unit 1 Science and Technology
        • Chapter 1 The Nature of Science
          • Launch Lab Understanding Measurements
          • Foldables
          • Section 1 The Methods of Science
            • Science Online
            • Integrate History
            • Integrate Earth Science
            • Science Online
              • Section 2 Standards of Measurement
                • Applying Math Centimeters
                • Integrate Earth Science
                • Science Online
                • MiniLAB Determining the Density of a Pencil
                • Visualizing SI Dimensions
                  • Section 3 Communicating with Graphs
                    • Applying Math Temperature
                    • MiniLAB Graphing Temperature Change
                    • Lab Whats my graph
                    • Lab Design Your Own - Developing a Measurement System
                    • Science and Language Arts Thinking in Pictures and Other Reports from My Life with Autism
                      • Chapter 1 Study Guide
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                      • Chapter 1 Standardized Test Practice
                        • Chapter 2 Science Technology and Society
                          • Lab Technology in Your Life
                          • Foldables
                          • Section 1 Science and Technology
                            • MiniLAB Researching the Past
                            • Visualizing Technology Supplying Basic Needs
                            • Science Online
                              • Section 2 Forces that Shape Technology
                                • MiniLAB Evaluating the Benefits and Consequences of Technology
                                • Integrate Environment
                                • Integrate History
                                • Applying Science What impact does the accident at Chernobyl have on the future of nuclear power
                                • Science Online
                                • Lab Who contributes CO2
                                  • Section 3 Developing Technology
                                    • Integrate Life Science
                                    • Integrate Career
                                    • Lab Model and Invent - Care Package
                                    • Oops Accidents in Science A Slippery Situation
                                      • Chapter 2 Study Guide
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                                      • Chapter 2 Standardized Test Practice
                                          • Unit 2 Motion Forces and Energy
                                            • Chapter 3 Motion Acceleration and Forces
                                              • Launch Lab Compare Speeds
                                              • Foldables
                                              • Section 1 Describing Motion
                                                • MiniLAB Measuring Average Speed
                                                • Science Online
                                                • Applying Math Average Speed
                                                • Integrate Astronomy
                                                • Science Online
                                                  • Section 2 Acceleration
                                                    • Integrate History
                                                    • Visualizing Acceleration
                                                      • Section 3 Motion and Forces
                                                        • Science Online
                                                        • MiniLAB Comparing Friction
                                                        • Lab Force and Acceleration
                                                        • Lab Design Your Own - Comparing Motion from Different Forces
                                                        • Science and Language Arts A Brave and Startling Truth
                                                          • Chapter 3 Study Guide
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                                                          • Chapter 3 Standardized Test Practice
                                                            • Chapter 4 The Laws of Motion
                                                              • Launch Lab The Force of Gravity
                                                              • Foldables
                                                              • Section 1 The First Two Laws of Motion
                                                                • MiniLAB Observing Inertia
                                                                • Science Online
                                                                • Applying Math The Acceleration of a Sled Solve a Simple Equation
                                                                  • Section 2 Gravity
                                                                    • Science Online
                                                                    • Integrate Earth Science
                                                                    • MiniLAB Observing Centripetal Force
                                                                    • Lab Gravity and Air Resistance
                                                                      • Section 3 The Third Law of Motion
                                                                        • Integrate Career
                                                                        • Visualizing Rocket Motion
                                                                        • Applying Math The Momentum of a Sprinter
                                                                        • Lab The Momentum of Colliding Objects
                                                                        • Science and History Newton and the Plague
                                                                          • Chapter 4 Study Guide
                                                                          • Chapter 4 Review
                                                                          • Chapter 4 Standardized Test Practice
                                                                            • Chapter 5 Energy
                                                                              • Launch Lab Energy Conversions
                                                                              • Foldables
                                                                              • Section 1 The Nature of Energy
                                                                                • Science Online
                                                                                • Applying Math Kinetic Energy
                                                                                • MiniLAB Interpreting Data from a Slingshot
                                                                                • Integrate Language Arts
                                                                                • Applying Math Gravitational Potential Energy
                                                                                • Lab Bouncing Balls
                                                                                  • Section 2 Conservation of Energy
                                                                                    • Visualizing Energy Transformations
                                                                                    • Integrate Environment
                                                                                    • MiniLAB Transforming Energy in a Paper Clip
                                                                                    • Science Online
                                                                                    • Integrate Health
                                                                                    • Lab Design Your Own - Swinging Energy
                                                                                    • Science and History The Impossible Dream
                                                                                      • Chapter 5 Study Guide
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                                                                                      • Chapter 5 Standardized Test Practice
                                                                                        • Chapter 6 Work and Machines
                                                                                          • Launch Lab Doing Work with a Simple Machine
                                                                                          • Foldables
                                                                                          • Section 1 Work
                                                                                            • Integrate Language Arts
                                                                                            • Applying Math Work
                                                                                            • MiniLAB Calculating Your Work and Power
                                                                                            • Applying Math Power
                                                                                              • Section 2 Using Machines
                                                                                                • MiniLAB Machines Multiplying Force
                                                                                                • Science Online
                                                                                                • Integrate Chemistry
                                                                                                  • Section 3 Simple Machines
                                                                                                    • Integrate History
                                                                                                    • Visualizing Levers in the Human Body
                                                                                                    • Science Online
                                                                                                    • Lab Levers
                                                                                                    • Lab Model and Invent - Using Simple Machines
                                                                                                    • Science and Society The Science of Very Very Small
                                                                                                      • Chapter 6 Study Guide
                                                                                                      • Chapter 6 Review
                                                                                                      • Chapter 6 Standardized Test Practice
                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                          • Launch Lab Relative Sizes of Earth the Moon and the Sun
                                                                                                          • Foldables
                                                                                                          • Section 1 Earth in Space
                                                                                                            • Science Online
                                                                                                            • Integrate Physics
                                                                                                              • Section 2 Time and Seasons
                                                                                                                • MiniLAB Modeling the Suns Rays at Solstice
                                                                                                                • Lab Comparing the Angle of Sunlight to Intensity
                                                                                                                  • Section 3 Earths Moon
                                                                                                                    • Applying Math Tides
                                                                                                                    • MiniLAB Modeling Phases and Eclipses
                                                                                                                    • Integrate History
                                                                                                                    • Integrate History
                                                                                                                    • Science Online
                                                                                                                    • Visualizing Water on the Moon
                                                                                                                    • Lab Identifying the Moons Surface Features and Apollo Landing Sites
                                                                                                                    • Oops Accidents in Science Even Great Scientists Make Mistakes
                                                                                                                      • Chapter 7 Study Guide
                                                                                                                      • Chapter 7 Review
                                                                                                                      • Chapter 7 Standardized Test Practice
                                                                                                                        • Chapter 8 The Solar System
                                                                                                                          • Launch Lab The Size of the Solar System
                                                                                                                          • Foldables
                                                                                                                          • Section 1 Planet Motion
                                                                                                                            • Integrate History
                                                                                                                            • MiniLAB Plotting Retrograde Motion
                                                                                                                            • Integrate Physics
                                                                                                                            • Applying Math Heliocentric Longitude (HL)
                                                                                                                              • Section 2 The Inner Planets
                                                                                                                                • Science Online
                                                                                                                                • Integrate Chemistry
                                                                                                                                • Lab Interpreting Features of Marss Surface
                                                                                                                                  • Section 3 The Outer Planets
                                                                                                                                    • Integrate Language Arts
                                                                                                                                    • Visualizing What Galileo Saw
                                                                                                                                    • Science Online
                                                                                                                                    • MiniLAB Comparing Sizes of Outer and Inner Planets
                                                                                                                                      • Section 4 Life in the Solar System
                                                                                                                                        • Lab Design Your Own - Testing Unknown Soil Samples for Life
                                                                                                                                        • Science Stats Night Sky Wonders
                                                                                                                                          • Chapter 8 Study Guide
                                                                                                                                          • Chapter 8 Review
                                                                                                                                          • Chapter 8 Standardized Test Practice
                                                                                                                                              • Unit 3 Energy in Motion
                                                                                                                                                • Chapter 9 Heat and States of Matter
                                                                                                                                                  • Launch Lab Expansion of a Gas
                                                                                                                                                  • Foldables
                                                                                                                                                  • Section 1 Temperature and Thermal Energy
                                                                                                                                                    • Applying Math Converting to Celsius
                                                                                                                                                    • Science Online
                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                    • Applying Math Change in Thermal Energy
                                                                                                                                                      • Section 2 States of Matter
                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                        • Science Online
                                                                                                                                                        • MiniLAB Comparing States of Water
                                                                                                                                                          • Section 3 Transferring Thermal Energy
                                                                                                                                                            • MiniLAB Comparing Thermal Conductors
                                                                                                                                                            • Visualizing Convection Currents
                                                                                                                                                            • Lab Convection in Gases and Liquids
                                                                                                                                                              • Section 4 Using Thermal Energy
                                                                                                                                                                • Integrate History
                                                                                                                                                                • Science Online
                                                                                                                                                                • Lab Conduction in Gases
                                                                                                                                                                • Science Stats Surprising Thermal Energy
                                                                                                                                                                  • Chapter 9 Study Guide
                                                                                                                                                                  • Chapter 9 Review
                                                                                                                                                                  • Chapter 9 Standardized Test Practice
                                                                                                                                                                    • Chapter 10 Waves
                                                                                                                                                                      • Launch Lab How do waves transfer energy
                                                                                                                                                                      • Foldables
                                                                                                                                                                      • Section 1 The Nature of Waves
                                                                                                                                                                        • Visualizing Formation of Ocean Waves
                                                                                                                                                                        • Science Online
                                                                                                                                                                          • Section 2 Wave Properties
                                                                                                                                                                            • MiniLAB Observing Wavelength
                                                                                                                                                                            • Integrate Social Studies
                                                                                                                                                                            • Applying Math The Speed of Sound
                                                                                                                                                                            • Lab Wave Speed and Tension
                                                                                                                                                                              • Section 3 The Behavior of Waves
                                                                                                                                                                                • Science Online
                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                • MiniLAB Experimenting with Resonance
                                                                                                                                                                                • Lab Measuring Wave Properties
                                                                                                                                                                                • Science and History Making Waves
                                                                                                                                                                                  • Chapter 10 Study Guide
                                                                                                                                                                                  • Chapter 10 Review
                                                                                                                                                                                  • Chapter 10 Standardized Test Practice
                                                                                                                                                                                    • Chapter 11 Sound and Light
                                                                                                                                                                                      • Launch Lab What sound does a ruler make
                                                                                                                                                                                      • Foldables
                                                                                                                                                                                      • Section 1 Sound
                                                                                                                                                                                        • MiniLAB Comparing Intensity
                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                        • Science Online
                                                                                                                                                                                        • Applying Math Using Sonar
                                                                                                                                                                                          • Section 2 Reflection and Refraction of Light
                                                                                                                                                                                          • Section 3 Mirrors Lenses and the Eye
                                                                                                                                                                                            • Visualizing Images Formed by a Convex Lens
                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                            • MiniLAB Experimenting with Focal Lengths
                                                                                                                                                                                            • Lab Reflections of Reflections
                                                                                                                                                                                              • Section 4 Light and Color
                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Lab Design Your Own - Blocking Noise Pollution
                                                                                                                                                                                                • Science and Language Arts A Haiku Garden The Four Seasons in Poems and Print
                                                                                                                                                                                                  • Chapter 11 Study Guide
                                                                                                                                                                                                  • Chapter 11 Review
                                                                                                                                                                                                  • Chapter 11 Standardized Test Practice
                                                                                                                                                                                                    • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                      • Launch Lab Global Jigsaw Puzzle
                                                                                                                                                                                                      • Foldables
                                                                                                                                                                                                      • Section 1 Evolution of Earths Crust
                                                                                                                                                                                                        • Applying Math Spreading Distances
                                                                                                                                                                                                        • Integrate Physics
                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                          • Section 2 Earthquakes
                                                                                                                                                                                                            • MiniLAB Demonstrating Four Types of Stress
                                                                                                                                                                                                            • Visualizing Earthquake-Proof Buildings
                                                                                                                                                                                                              • Section 3 Earths Interior
                                                                                                                                                                                                              • Section 4 Volcanoes
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • MiniLAB Modeling Lava Viscosity
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                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                • Lab A Case for Pacific Plate Motion
                                                                                                                                                                                                                • Lab Earthquake Earthquake Wheres the earthquake
                                                                                                                                                                                                                • Science and History Volcano Weather
                                                                                                                                                                                                                  • Chapter 12 Study Guide
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                                                                                                                                                                                                                      • Unit 4 Forms of Energy
                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                          • Launch Lab Electric Circuits
                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                          • Section 1 Electric Charge
                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                            • Visualizing Lightning
                                                                                                                                                                                                                            • MiniLAB Investigate Charged Objects
                                                                                                                                                                                                                              • Section 2 Electric Current
                                                                                                                                                                                                                                • MiniLAB Investigating Battery Addition
                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                • Lab Identifying Conductors and Insulators
                                                                                                                                                                                                                                  • Section 3 Electrical Energy
                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                    • Applying Math Power Used by a Clothes Dryer
                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                    • Applying Math Electrical Energy Used by a Microwave Oven
                                                                                                                                                                                                                                    • Lab Design Your Own - Comparing Series and Parallel Circuits
                                                                                                                                                                                                                                    • Science and Language Arts Invisible Man
                                                                                                                                                                                                                                      • Chapter 13 Study Guide
                                                                                                                                                                                                                                      • Chapter 13 Review
                                                                                                                                                                                                                                      • Chapter 13 Standardized Test Practice
                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                          • Launch Lab The Strength of Magnets
                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                          • Section 1 Magnetism
                                                                                                                                                                                                                                            • MiniLAB Observing Magnetic Interference
                                                                                                                                                                                                                                            • Integrate Earth Science
                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                            • Applying Science How can magnetic parts of a junk car be salvaged
                                                                                                                                                                                                                                            • MiniLAB Making Your Own Compass
                                                                                                                                                                                                                                              • Section 2 Electricity and Magnetism
                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                  • Section 3 Producing Electric Current
                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                    • Visualizing Motors and Generators
                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                    • Lab Electricity and Magnetism
                                                                                                                                                                                                                                                    • Lab Design Your Own - Controlling Electromagnets
                                                                                                                                                                                                                                                    • Science and History Body Art
                                                                                                                                                                                                                                                      • Chapter 14 Study Guide
                                                                                                                                                                                                                                                      • Chapter 14 Review
                                                                                                                                                                                                                                                      • Chapter 14 Standardized Test Practice
                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                          • Launch Lab Can electromagnetic waves change materials
                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                          • Section 1 What are electromagnetic waves
                                                                                                                                                                                                                                                            • MiniLAB Investigating Electromagnetic Waves
                                                                                                                                                                                                                                                            • Applying Math The Speed of Light in Water
                                                                                                                                                                                                                                                              • Section 2 The Electromagnetic Spectrum
                                                                                                                                                                                                                                                                • MiniLAB Heating with Microwaves
                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                • Lab The Shape of Satellite Dishes
                                                                                                                                                                                                                                                                  • Section 3 Radio Communication
                                                                                                                                                                                                                                                                    • Visualizing Radio Broadcasts
                                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Lab Use the Internet - Radio Frequencies
                                                                                                                                                                                                                                                                    • Science and History Riding a Beam of Light
                                                                                                                                                                                                                                                                      • Chapter 15 Study Guide
                                                                                                                                                                                                                                                                      • Chapter 15 Review
                                                                                                                                                                                                                                                                      • Chapter 15 Standardized Test Practice
                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                          • Launch Lab Heating with Solar Energy
                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                          • Section 1 Fossil Fuels
                                                                                                                                                                                                                                                                            • Visualizing The Formation of Fossil Fuels
                                                                                                                                                                                                                                                                            • MiniLAB Designing an Efficient Water Heater
                                                                                                                                                                                                                                                                              • Section 2 Nuclear Energy
                                                                                                                                                                                                                                                                                • Integrate Earth Science
                                                                                                                                                                                                                                                                                • Integrate Social Science
                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                • Applying Science Can a contaminated radioactive site be reclaimed
                                                                                                                                                                                                                                                                                  • Section 3 Renewable Energy Sources
                                                                                                                                                                                                                                                                                    • MiniLAB Using Solar Power at Home
                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                    • Lab Solar Heating
                                                                                                                                                                                                                                                                                    • Lab Use the Internet How much does energy really cost
                                                                                                                                                                                                                                                                                    • Science and Society Reacting to Nuclear Energy
                                                                                                                                                                                                                                                                                      • Chapter 16 Study Guide
                                                                                                                                                                                                                                                                                      • Chapter 16 Review
                                                                                                                                                                                                                                                                                      • Chapter 16 Standardized Test Practice
                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                          • Lab Atmospheric Pressure
                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                          • Section 1 Earths Atmosphere
                                                                                                                                                                                                                                                                                            • MiniLAB Visualizing Convection
                                                                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                                                                            • Lab Visualizing a Temperature Inversion
                                                                                                                                                                                                                                                                                              • Section 2 Weather
                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Coriolis Effect
                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                  • Section 3 Climate
                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                    • Visualizing Earths Biogeophysical System
                                                                                                                                                                                                                                                                                                      • Section 4 Earths Changing Climates
                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                        • Applying Math Carbon Dioxide (CO2) Concentration
                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Investigating Microclimate
                                                                                                                                                                                                                                                                                                        • Science and Language Arts The Grapes of Wrath
                                                                                                                                                                                                                                                                                                          • Chapter 17 Study Guide
                                                                                                                                                                                                                                                                                                          • Chapter 17 Review
                                                                                                                                                                                                                                                                                                          • Chapter 17 Standardized Test Practice
                                                                                                                                                                                                                                                                                                              • Unit 5 Matter and Earth Materials
                                                                                                                                                                                                                                                                                                                • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                  • Launch Lab Demonstrate the Distillation of Water
                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                  • Section 1 Composition of Matter
                                                                                                                                                                                                                                                                                                                    • Visualizing Elements
                                                                                                                                                                                                                                                                                                                    • MiniLAB Classifying Materials
                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                    • Lab Comparing Pure Substances and Mixtures
                                                                                                                                                                                                                                                                                                                      • Section 2 Properties of Matter
                                                                                                                                                                                                                                                                                                                        • Integrate Environment
                                                                                                                                                                                                                                                                                                                        • MiniLAB Separating Ink
                                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                                        • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                        • Applying Math The Law of Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Measuring the Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Science Stats Intriguing Elements
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Study Guide
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Review
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                            • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                              • Launch Lab Inferring What You Cant Observe
                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                              • Section 1 Structure of the Atom
                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling an Aluminum Atom
                                                                                                                                                                                                                                                                                                                                • Visualizing The Atomic Model
                                                                                                                                                                                                                                                                                                                                  • Section 2 Masses of Atoms
                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                    • Applying Science How can radioactive isotopes help tell time
                                                                                                                                                                                                                                                                                                                                      • Section 3 The Periodic Table
                                                                                                                                                                                                                                                                                                                                        • MiniLAB Organizing a Personal Periodic Table
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Career
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                                                                                                                                                                        • Lab A Periodic Table of Foods
                                                                                                                                                                                                                                                                                                                                        • Lab Use the Internet Whats in a name
                                                                                                                                                                                                                                                                                                                                        • Science and History A Chilling Story
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Study Guide
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Review
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                            • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                              • Launch Lab Earth Materials at Home and School
                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                              • Section 1 Minerals
                                                                                                                                                                                                                                                                                                                                                • MiniLAB Identifying Salts Crystal System
                                                                                                                                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                • Lab Be a Mineral Detective
                                                                                                                                                                                                                                                                                                                                                  • Section 2 Igneous Rocks
                                                                                                                                                                                                                                                                                                                                                    • Applying Math Extrusive Igneous Rock Classification
                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                      • Section 3 Sedimentary Rocks
                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Evaporites
                                                                                                                                                                                                                                                                                                                                                          • Section 4 Metamorphic Rocks and the Rock Cycle
                                                                                                                                                                                                                                                                                                                                                            • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                            • Visualizing Shock Metamorphic Rock
                                                                                                                                                                                                                                                                                                                                                            • Lab Identifying Rocks
                                                                                                                                                                                                                                                                                                                                                            • Science and Society Earth Materials at Work
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Study Guide
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Review
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                  • Launch Lab Have you got the time
                                                                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                                                                  • Section 1 Weathering and Soil
                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing a Disappearing Seasoning
                                                                                                                                                                                                                                                                                                                                                                    • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                    • Lab Graphing Soil Textures
                                                                                                                                                                                                                                                                                                                                                                      • Section 2 Shaping the Landscape
                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Runoff
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                          • Section 3 Groundwater
                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Porosity Volume
                                                                                                                                                                                                                                                                                                                                                                            • Visualizing The Role of Groundwater in Shaping Earths Surface
                                                                                                                                                                                                                                                                                                                                                                            • Integrate Environment
                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                              • Section 4 Geologic Time
                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                                                                                                • Lab Its about time - relative that is
                                                                                                                                                                                                                                                                                                                                                                                • Science and Society Tapping into the Underground
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Review
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                      • Unit 6 Interactions of Matter
                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                          • Lab Chemical Bonds and Mixing
                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Stability in Bonding
                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                            • Lab Atomic Trading Cards
                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Types of Bonds
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Observing a Bond Type
                                                                                                                                                                                                                                                                                                                                                                                                • Visualizing Polar Molecules
                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Writing Formulas and Naming Compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math Determining a Formula
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Science Can you name binary ionic compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Making a Hydrate
                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Model and Invent - Modeling Chemical Bonding
                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Sticky Subject
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Review
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab RustingmdashA Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Chemical Changes
                                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Designing a Team Equation
                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Chemical Equations
                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math Barium Sulfate Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Classifying Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 4 Reaction Rates and Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing Chemical Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Creating a Colorful Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab To Glow or Not to Glow
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Investigating Reaction Conditions
                                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Clumsy Move Pays Off
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Review
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab Magic Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 How Solutions Form
                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                                                                                                                                                                                                                                                            • Visualizing Metal Alloys
                                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Observing the Effect of Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Solubility and Concentration
                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Acids Bases and Salts
                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing Acid Relief
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Strength of Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Determining Acidity
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Saturated Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and Society Acid Rain
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab The Size of a Nucleus
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Strong Force
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Nuclear Decay
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Detecting Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math The Age of Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Social Studies
                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Nuclear Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling a Nuclear Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Visualizing PET Scans
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Chain Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Model and Invent Modeling Transmutations
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and History The Nuclear Alchemist
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 26 Stars and Galaxies
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab Stars in the Sky
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Observing the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling a Telescope
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math The Magnifying Power of Telescopes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Evolution of Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Counting Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing H-R Diagrams of Star Clusters
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Star Cluster Age
                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 3 Galaxies and the Milky Way
                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 4 Cosmology
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Lab Model and Invent - Expansion of the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Science and Language Arts Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Student Resources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Skill Handbook
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Scientific Methods
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Safety Symbols
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Safety in the Science Laboratory
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Math Skill Handbook
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Math Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Science Applications
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Formulas
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Extra Math Problems
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Reference Handbook
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Minerals
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Physical Science Reference Tables
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Periodic Table of the Elements
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Weather Map Symbols
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                • EnglishSpanish Glossary
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Index
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Credits
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Students Workbooks
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter Resources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 1 The Nature of Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 2 Science Technology and Society
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 3 Motion Acceleration and Forces
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 4 The Laws of Motion
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 5 Energy
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 6 Work and Machines
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 8 The Solar System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 9 Heat and States of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 10 Waves
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 11 Sound and Light
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 25 Nuclear Changes
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Page 31: 706 S1 318-326 GPS09 - Light-and-Sound - home · PDF fileWhat sound does a ruler make? ... sound waves cannot travel in empty space where there are no particles. ... sound travels

Complete each statement with the correctvocabulary word or phrase

1 A change in frequency due to a movingsound source is due to the

2 A flat smooth surface that reflects light andforms an image is a(n)

3 An object is if you can seethrough it clearly

4 The of a material indicates howmuch the speed of light in the materialchanges as light passes through

5 You can change the color of white paint byadding a(n) to it

6 A(n) is a reflecting surface thatcurves outward like the back of a spoon

7 The human perception of the intensity of asound wave is

Choose the word or phrase that best answerseach question

8 Which of the following best describes imageformation by a plane mirrorA) A real image is formed in front of the mirrorB) A real image is formed behind the mirrorC) A virtual image is formed in front of the

mirrorD) A virtual image is formed behind the mirror

9 For a sound with low pitch what else isalso always lowA) amplitude C) wavelengthB) frequency D) wave velocity

10 Which of the following occurs when asound source moves away from youA) The soundrsquos velocity decreasesB) The soundrsquos loudness increasesC) The soundrsquos frequency decreasesD) The soundrsquos frequency increases

Use the table below to answer question 11

11 Based on the data in the table abovewhich of the following would be the speedof sound in air at 30degCA) 3404 ms C) 3494 msB) 3464 ms D) 3534 ms

12 What happens to a light ray travelingparallel to the optical axis of a convexlens that passes through the lensA) It travels parallel to the optical axisB) It passes through the focal pointC) It is bent away from the optical axisD) It forms a virtual image

13 Light waves of which color are bent mostwhen passing through a prismA) blue C) violetB) red D) yellow

14 Which way does a concave lens bend lightA) toward its optical axisB) toward its centerC) toward its edgesD) toward its focal point

Speed of Sound in Air

Temp peed( s)

4

4

4

348 CHAPTER REVIEW

concave lens p 335concave mirror p 332convex lens p 333convex mirror p 333decibel p 322Doppler effect p 323index of refraction p 329intensity p 322

loudness p 322opaque p 327pigment p 342pitch p 323plane mirror p 331translucent p 327transparent p 327

Vocabulary PuzzleMaker gpesciencecom

Use the illustration below to answer question 15

15 Describe how the position of the candlechanged if the image of the candle movedaway from the focal point

16 Apply Acoustic scientists sometimes doresearch in rooms that absorb all soundwaves How could such a room be used tostudy how bats find their food

17 Compare White light passes through atranslucent pane of glass and shines on ashirt Both the translucent glass and theshirt appear green Compare the colors oflight that are absorbed and transmitted bythe glass and the shirt

18 Infer Most mammals including dogs andcats canrsquot see colors Infer how the retinaof a catrsquos eye might be different from theretina of a human eye

19 Determine whether a convex lens could forman image that is enlarged real and upright

20 Infer A car comes to a railroad crossingThe driver hears a trainrsquos whistle and itspitch becomes lower What can beassumed about how the train is moving

21 Compare and contrast the reflection of lightfrom a white wall with a rough surfacewith the reflection of light from a mirror

Optical axis

One

focal

length

Two

focal

lengths

Image

Ray A

Object

Focal

point

Interpreting Graphics 22 Infer why a convex mirror and a concavelens can never produce a real image

23 Predict what color a white shirt wouldappear to be if the light reflected from theshirt passed through a red filter and thenthrough a green filter

24 Explain why windows might begin to rattlewhen an airplane flies overhead

25 Communicate Some people enjoy usingsnowmobiles Others object to the noisethat they make Write a proposal for a pol-icy that seems fair to both groups for theuse of snowmobiles in a state park

CHAPTER REVIEW 349

Use the wave speed equation ν ƒλ to answer

questions 26 and 27

26 Calculate Frequency A sonar pulse has awavelength of 30 cm and a speed inwater of 1500 ms Find its frequency

27 Calculate Wavelength What is the wave-length of a sound wave with a fre-quency of 440 Hz if the speed of soundin air is 340 ms

28 Calculate Angle of Incidence A light ray isreflected from a mirror If the anglebetween the incident ray and thereflected ray is 136deg what is the angleof incidence

29 Determine Object Distance You hold anobject in front of a concave mirror witha focal length of 30 cm If you do notsee a reflected image how far from themirror is the object

30 Calculate Speed The speed of light in avacuum is 300000 kms If the index ofrefraction of water is 133 what is thespeed of light in water

More Chapter Review gpesciencecom

1 Which of the following describes the imageformed by a convex mirror

A enlarged

B inverted

C real

D virtual

Use the figure below to answer question 2

2 Which of the following describes a light raythat passes through the focal point andthen is reflected by the mirror

A It travels parallel to the optical axis

B It forms a real image

C It is reflected back through the focal point

D It forms a virtual image

3 Why does an apple look red

A It reflects red light

B It absorbs red light

C It reflects green and blue light

D It reflects all colors of light except red

Use the figure below to answer questions 4 and 5

4 When the primary colors of light are addedtogether what color appears in area H

A cyan

B magenta

C white

D yellow

5 When the primary colors of light are addedtogether what color appears in area G

A cyan

B magenta

C white

D yellow

6 Which of the following increases as the fre-quency of a sound increases

A amplitude

B intensity

C loudness

D pitch

Red Blue

Green

F

H

G K

Focal pointOptical axis

350 STANDARDIZED TEST PRACTICE

Record your answers on the answer sheet provided by your teacher or on a sheet of paper

STANDARDIZED TEST PRACTICE 351

7 Which of the following parts of the eyeenable you to see colors in bright light

A cone cells

B cornea

C lens

D rod cells

Use the graph below to answer questions 8 and 9

8 Determine how far in centimeters theimage is from the lens when the object is15 centimeters from the lens

9 How far in centimeters is the object fromthe lens when the image distance andobject distance are equal

10 A shirt has stripes that are black and whitein white light If green light shines on thisshirt what colors will the black and whitestripes be

11 If you are on a moving train what hap-pens to the pitch of a crossing bell as youapproach the crossing and then moveaway from the crossing

Use the figure below to answer question 12

12 Describe the vision problem show by thefigure and explain how this vision prob-lem can be corrected

13 Explain why the human eye can see colorsbetter in bright light than in dim light

Image Distance fora Convex Lens

Ima

ge

dis

tan

ce (

cm)

30

25

20

15

10

5 10 15 20 25 30

Object distance (cm)

Standardized Test Practice gpesciencecom

Note Units Read carefully and make note of the units used in

any measurement

  • Glencoe Physical Science with Earth Science
    • Student Edition Table of Contents
      • Unit 1 Science and Technology
        • Chapter 1 The Nature of Science
          • Launch Lab Understanding Measurements
          • Foldables
          • Section 1 The Methods of Science
            • Science Online
            • Integrate History
            • Integrate Earth Science
            • Science Online
              • Section 2 Standards of Measurement
                • Applying Math Centimeters
                • Integrate Earth Science
                • Science Online
                • MiniLAB Determining the Density of a Pencil
                • Visualizing SI Dimensions
                  • Section 3 Communicating with Graphs
                    • Applying Math Temperature
                    • MiniLAB Graphing Temperature Change
                    • Lab Whats my graph
                    • Lab Design Your Own - Developing a Measurement System
                    • Science and Language Arts Thinking in Pictures and Other Reports from My Life with Autism
                      • Chapter 1 Study Guide
                      • Chapter 1 Review
                      • Chapter 1 Standardized Test Practice
                        • Chapter 2 Science Technology and Society
                          • Lab Technology in Your Life
                          • Foldables
                          • Section 1 Science and Technology
                            • MiniLAB Researching the Past
                            • Visualizing Technology Supplying Basic Needs
                            • Science Online
                              • Section 2 Forces that Shape Technology
                                • MiniLAB Evaluating the Benefits and Consequences of Technology
                                • Integrate Environment
                                • Integrate History
                                • Applying Science What impact does the accident at Chernobyl have on the future of nuclear power
                                • Science Online
                                • Lab Who contributes CO2
                                  • Section 3 Developing Technology
                                    • Integrate Life Science
                                    • Integrate Career
                                    • Lab Model and Invent - Care Package
                                    • Oops Accidents in Science A Slippery Situation
                                      • Chapter 2 Study Guide
                                      • Chapter 2 Review
                                      • Chapter 2 Standardized Test Practice
                                          • Unit 2 Motion Forces and Energy
                                            • Chapter 3 Motion Acceleration and Forces
                                              • Launch Lab Compare Speeds
                                              • Foldables
                                              • Section 1 Describing Motion
                                                • MiniLAB Measuring Average Speed
                                                • Science Online
                                                • Applying Math Average Speed
                                                • Integrate Astronomy
                                                • Science Online
                                                  • Section 2 Acceleration
                                                    • Integrate History
                                                    • Visualizing Acceleration
                                                      • Section 3 Motion and Forces
                                                        • Science Online
                                                        • MiniLAB Comparing Friction
                                                        • Lab Force and Acceleration
                                                        • Lab Design Your Own - Comparing Motion from Different Forces
                                                        • Science and Language Arts A Brave and Startling Truth
                                                          • Chapter 3 Study Guide
                                                          • Chapter 3 Review
                                                          • Chapter 3 Standardized Test Practice
                                                            • Chapter 4 The Laws of Motion
                                                              • Launch Lab The Force of Gravity
                                                              • Foldables
                                                              • Section 1 The First Two Laws of Motion
                                                                • MiniLAB Observing Inertia
                                                                • Science Online
                                                                • Applying Math The Acceleration of a Sled Solve a Simple Equation
                                                                  • Section 2 Gravity
                                                                    • Science Online
                                                                    • Integrate Earth Science
                                                                    • MiniLAB Observing Centripetal Force
                                                                    • Lab Gravity and Air Resistance
                                                                      • Section 3 The Third Law of Motion
                                                                        • Integrate Career
                                                                        • Visualizing Rocket Motion
                                                                        • Applying Math The Momentum of a Sprinter
                                                                        • Lab The Momentum of Colliding Objects
                                                                        • Science and History Newton and the Plague
                                                                          • Chapter 4 Study Guide
                                                                          • Chapter 4 Review
                                                                          • Chapter 4 Standardized Test Practice
                                                                            • Chapter 5 Energy
                                                                              • Launch Lab Energy Conversions
                                                                              • Foldables
                                                                              • Section 1 The Nature of Energy
                                                                                • Science Online
                                                                                • Applying Math Kinetic Energy
                                                                                • MiniLAB Interpreting Data from a Slingshot
                                                                                • Integrate Language Arts
                                                                                • Applying Math Gravitational Potential Energy
                                                                                • Lab Bouncing Balls
                                                                                  • Section 2 Conservation of Energy
                                                                                    • Visualizing Energy Transformations
                                                                                    • Integrate Environment
                                                                                    • MiniLAB Transforming Energy in a Paper Clip
                                                                                    • Science Online
                                                                                    • Integrate Health
                                                                                    • Lab Design Your Own - Swinging Energy
                                                                                    • Science and History The Impossible Dream
                                                                                      • Chapter 5 Study Guide
                                                                                      • Chapter 5 Review
                                                                                      • Chapter 5 Standardized Test Practice
                                                                                        • Chapter 6 Work and Machines
                                                                                          • Launch Lab Doing Work with a Simple Machine
                                                                                          • Foldables
                                                                                          • Section 1 Work
                                                                                            • Integrate Language Arts
                                                                                            • Applying Math Work
                                                                                            • MiniLAB Calculating Your Work and Power
                                                                                            • Applying Math Power
                                                                                              • Section 2 Using Machines
                                                                                                • MiniLAB Machines Multiplying Force
                                                                                                • Science Online
                                                                                                • Integrate Chemistry
                                                                                                  • Section 3 Simple Machines
                                                                                                    • Integrate History
                                                                                                    • Visualizing Levers in the Human Body
                                                                                                    • Science Online
                                                                                                    • Lab Levers
                                                                                                    • Lab Model and Invent - Using Simple Machines
                                                                                                    • Science and Society The Science of Very Very Small
                                                                                                      • Chapter 6 Study Guide
                                                                                                      • Chapter 6 Review
                                                                                                      • Chapter 6 Standardized Test Practice
                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                          • Launch Lab Relative Sizes of Earth the Moon and the Sun
                                                                                                          • Foldables
                                                                                                          • Section 1 Earth in Space
                                                                                                            • Science Online
                                                                                                            • Integrate Physics
                                                                                                              • Section 2 Time and Seasons
                                                                                                                • MiniLAB Modeling the Suns Rays at Solstice
                                                                                                                • Lab Comparing the Angle of Sunlight to Intensity
                                                                                                                  • Section 3 Earths Moon
                                                                                                                    • Applying Math Tides
                                                                                                                    • MiniLAB Modeling Phases and Eclipses
                                                                                                                    • Integrate History
                                                                                                                    • Integrate History
                                                                                                                    • Science Online
                                                                                                                    • Visualizing Water on the Moon
                                                                                                                    • Lab Identifying the Moons Surface Features and Apollo Landing Sites
                                                                                                                    • Oops Accidents in Science Even Great Scientists Make Mistakes
                                                                                                                      • Chapter 7 Study Guide
                                                                                                                      • Chapter 7 Review
                                                                                                                      • Chapter 7 Standardized Test Practice
                                                                                                                        • Chapter 8 The Solar System
                                                                                                                          • Launch Lab The Size of the Solar System
                                                                                                                          • Foldables
                                                                                                                          • Section 1 Planet Motion
                                                                                                                            • Integrate History
                                                                                                                            • MiniLAB Plotting Retrograde Motion
                                                                                                                            • Integrate Physics
                                                                                                                            • Applying Math Heliocentric Longitude (HL)
                                                                                                                              • Section 2 The Inner Planets
                                                                                                                                • Science Online
                                                                                                                                • Integrate Chemistry
                                                                                                                                • Lab Interpreting Features of Marss Surface
                                                                                                                                  • Section 3 The Outer Planets
                                                                                                                                    • Integrate Language Arts
                                                                                                                                    • Visualizing What Galileo Saw
                                                                                                                                    • Science Online
                                                                                                                                    • MiniLAB Comparing Sizes of Outer and Inner Planets
                                                                                                                                      • Section 4 Life in the Solar System
                                                                                                                                        • Lab Design Your Own - Testing Unknown Soil Samples for Life
                                                                                                                                        • Science Stats Night Sky Wonders
                                                                                                                                          • Chapter 8 Study Guide
                                                                                                                                          • Chapter 8 Review
                                                                                                                                          • Chapter 8 Standardized Test Practice
                                                                                                                                              • Unit 3 Energy in Motion
                                                                                                                                                • Chapter 9 Heat and States of Matter
                                                                                                                                                  • Launch Lab Expansion of a Gas
                                                                                                                                                  • Foldables
                                                                                                                                                  • Section 1 Temperature and Thermal Energy
                                                                                                                                                    • Applying Math Converting to Celsius
                                                                                                                                                    • Science Online
                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                    • Applying Math Change in Thermal Energy
                                                                                                                                                      • Section 2 States of Matter
                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                        • Science Online
                                                                                                                                                        • MiniLAB Comparing States of Water
                                                                                                                                                          • Section 3 Transferring Thermal Energy
                                                                                                                                                            • MiniLAB Comparing Thermal Conductors
                                                                                                                                                            • Visualizing Convection Currents
                                                                                                                                                            • Lab Convection in Gases and Liquids
                                                                                                                                                              • Section 4 Using Thermal Energy
                                                                                                                                                                • Integrate History
                                                                                                                                                                • Science Online
                                                                                                                                                                • Lab Conduction in Gases
                                                                                                                                                                • Science Stats Surprising Thermal Energy
                                                                                                                                                                  • Chapter 9 Study Guide
                                                                                                                                                                  • Chapter 9 Review
                                                                                                                                                                  • Chapter 9 Standardized Test Practice
                                                                                                                                                                    • Chapter 10 Waves
                                                                                                                                                                      • Launch Lab How do waves transfer energy
                                                                                                                                                                      • Foldables
                                                                                                                                                                      • Section 1 The Nature of Waves
                                                                                                                                                                        • Visualizing Formation of Ocean Waves
                                                                                                                                                                        • Science Online
                                                                                                                                                                          • Section 2 Wave Properties
                                                                                                                                                                            • MiniLAB Observing Wavelength
                                                                                                                                                                            • Integrate Social Studies
                                                                                                                                                                            • Applying Math The Speed of Sound
                                                                                                                                                                            • Lab Wave Speed and Tension
                                                                                                                                                                              • Section 3 The Behavior of Waves
                                                                                                                                                                                • Science Online
                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                • MiniLAB Experimenting with Resonance
                                                                                                                                                                                • Lab Measuring Wave Properties
                                                                                                                                                                                • Science and History Making Waves
                                                                                                                                                                                  • Chapter 10 Study Guide
                                                                                                                                                                                  • Chapter 10 Review
                                                                                                                                                                                  • Chapter 10 Standardized Test Practice
                                                                                                                                                                                    • Chapter 11 Sound and Light
                                                                                                                                                                                      • Launch Lab What sound does a ruler make
                                                                                                                                                                                      • Foldables
                                                                                                                                                                                      • Section 1 Sound
                                                                                                                                                                                        • MiniLAB Comparing Intensity
                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                        • Science Online
                                                                                                                                                                                        • Applying Math Using Sonar
                                                                                                                                                                                          • Section 2 Reflection and Refraction of Light
                                                                                                                                                                                          • Section 3 Mirrors Lenses and the Eye
                                                                                                                                                                                            • Visualizing Images Formed by a Convex Lens
                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                            • MiniLAB Experimenting with Focal Lengths
                                                                                                                                                                                            • Lab Reflections of Reflections
                                                                                                                                                                                              • Section 4 Light and Color
                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Lab Design Your Own - Blocking Noise Pollution
                                                                                                                                                                                                • Science and Language Arts A Haiku Garden The Four Seasons in Poems and Print
                                                                                                                                                                                                  • Chapter 11 Study Guide
                                                                                                                                                                                                  • Chapter 11 Review
                                                                                                                                                                                                  • Chapter 11 Standardized Test Practice
                                                                                                                                                                                                    • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                      • Launch Lab Global Jigsaw Puzzle
                                                                                                                                                                                                      • Foldables
                                                                                                                                                                                                      • Section 1 Evolution of Earths Crust
                                                                                                                                                                                                        • Applying Math Spreading Distances
                                                                                                                                                                                                        • Integrate Physics
                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                          • Section 2 Earthquakes
                                                                                                                                                                                                            • MiniLAB Demonstrating Four Types of Stress
                                                                                                                                                                                                            • Visualizing Earthquake-Proof Buildings
                                                                                                                                                                                                              • Section 3 Earths Interior
                                                                                                                                                                                                              • Section 4 Volcanoes
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • MiniLAB Modeling Lava Viscosity
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                • Lab A Case for Pacific Plate Motion
                                                                                                                                                                                                                • Lab Earthquake Earthquake Wheres the earthquake
                                                                                                                                                                                                                • Science and History Volcano Weather
                                                                                                                                                                                                                  • Chapter 12 Study Guide
                                                                                                                                                                                                                  • Chapter 12 Review
                                                                                                                                                                                                                  • Chapter 12 Standardized Test Practice
                                                                                                                                                                                                                      • Unit 4 Forms of Energy
                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                          • Launch Lab Electric Circuits
                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                          • Section 1 Electric Charge
                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                            • Visualizing Lightning
                                                                                                                                                                                                                            • MiniLAB Investigate Charged Objects
                                                                                                                                                                                                                              • Section 2 Electric Current
                                                                                                                                                                                                                                • MiniLAB Investigating Battery Addition
                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                • Lab Identifying Conductors and Insulators
                                                                                                                                                                                                                                  • Section 3 Electrical Energy
                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                    • Applying Math Power Used by a Clothes Dryer
                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                    • Applying Math Electrical Energy Used by a Microwave Oven
                                                                                                                                                                                                                                    • Lab Design Your Own - Comparing Series and Parallel Circuits
                                                                                                                                                                                                                                    • Science and Language Arts Invisible Man
                                                                                                                                                                                                                                      • Chapter 13 Study Guide
                                                                                                                                                                                                                                      • Chapter 13 Review
                                                                                                                                                                                                                                      • Chapter 13 Standardized Test Practice
                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                          • Launch Lab The Strength of Magnets
                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                          • Section 1 Magnetism
                                                                                                                                                                                                                                            • MiniLAB Observing Magnetic Interference
                                                                                                                                                                                                                                            • Integrate Earth Science
                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                            • Applying Science How can magnetic parts of a junk car be salvaged
                                                                                                                                                                                                                                            • MiniLAB Making Your Own Compass
                                                                                                                                                                                                                                              • Section 2 Electricity and Magnetism
                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                  • Section 3 Producing Electric Current
                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                    • Visualizing Motors and Generators
                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                    • Lab Electricity and Magnetism
                                                                                                                                                                                                                                                    • Lab Design Your Own - Controlling Electromagnets
                                                                                                                                                                                                                                                    • Science and History Body Art
                                                                                                                                                                                                                                                      • Chapter 14 Study Guide
                                                                                                                                                                                                                                                      • Chapter 14 Review
                                                                                                                                                                                                                                                      • Chapter 14 Standardized Test Practice
                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                          • Launch Lab Can electromagnetic waves change materials
                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                          • Section 1 What are electromagnetic waves
                                                                                                                                                                                                                                                            • MiniLAB Investigating Electromagnetic Waves
                                                                                                                                                                                                                                                            • Applying Math The Speed of Light in Water
                                                                                                                                                                                                                                                              • Section 2 The Electromagnetic Spectrum
                                                                                                                                                                                                                                                                • MiniLAB Heating with Microwaves
                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                • Lab The Shape of Satellite Dishes
                                                                                                                                                                                                                                                                  • Section 3 Radio Communication
                                                                                                                                                                                                                                                                    • Visualizing Radio Broadcasts
                                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Lab Use the Internet - Radio Frequencies
                                                                                                                                                                                                                                                                    • Science and History Riding a Beam of Light
                                                                                                                                                                                                                                                                      • Chapter 15 Study Guide
                                                                                                                                                                                                                                                                      • Chapter 15 Review
                                                                                                                                                                                                                                                                      • Chapter 15 Standardized Test Practice
                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                          • Launch Lab Heating with Solar Energy
                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                          • Section 1 Fossil Fuels
                                                                                                                                                                                                                                                                            • Visualizing The Formation of Fossil Fuels
                                                                                                                                                                                                                                                                            • MiniLAB Designing an Efficient Water Heater
                                                                                                                                                                                                                                                                              • Section 2 Nuclear Energy
                                                                                                                                                                                                                                                                                • Integrate Earth Science
                                                                                                                                                                                                                                                                                • Integrate Social Science
                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                • Applying Science Can a contaminated radioactive site be reclaimed
                                                                                                                                                                                                                                                                                  • Section 3 Renewable Energy Sources
                                                                                                                                                                                                                                                                                    • MiniLAB Using Solar Power at Home
                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                    • Lab Solar Heating
                                                                                                                                                                                                                                                                                    • Lab Use the Internet How much does energy really cost
                                                                                                                                                                                                                                                                                    • Science and Society Reacting to Nuclear Energy
                                                                                                                                                                                                                                                                                      • Chapter 16 Study Guide
                                                                                                                                                                                                                                                                                      • Chapter 16 Review
                                                                                                                                                                                                                                                                                      • Chapter 16 Standardized Test Practice
                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                          • Lab Atmospheric Pressure
                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                          • Section 1 Earths Atmosphere
                                                                                                                                                                                                                                                                                            • MiniLAB Visualizing Convection
                                                                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                                                                            • Lab Visualizing a Temperature Inversion
                                                                                                                                                                                                                                                                                              • Section 2 Weather
                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Coriolis Effect
                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                  • Section 3 Climate
                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                    • Visualizing Earths Biogeophysical System
                                                                                                                                                                                                                                                                                                      • Section 4 Earths Changing Climates
                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                        • Applying Math Carbon Dioxide (CO2) Concentration
                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Investigating Microclimate
                                                                                                                                                                                                                                                                                                        • Science and Language Arts The Grapes of Wrath
                                                                                                                                                                                                                                                                                                          • Chapter 17 Study Guide
                                                                                                                                                                                                                                                                                                          • Chapter 17 Review
                                                                                                                                                                                                                                                                                                          • Chapter 17 Standardized Test Practice
                                                                                                                                                                                                                                                                                                              • Unit 5 Matter and Earth Materials
                                                                                                                                                                                                                                                                                                                • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                  • Launch Lab Demonstrate the Distillation of Water
                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                  • Section 1 Composition of Matter
                                                                                                                                                                                                                                                                                                                    • Visualizing Elements
                                                                                                                                                                                                                                                                                                                    • MiniLAB Classifying Materials
                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                    • Lab Comparing Pure Substances and Mixtures
                                                                                                                                                                                                                                                                                                                      • Section 2 Properties of Matter
                                                                                                                                                                                                                                                                                                                        • Integrate Environment
                                                                                                                                                                                                                                                                                                                        • MiniLAB Separating Ink
                                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                                        • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                        • Applying Math The Law of Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Measuring the Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Science Stats Intriguing Elements
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Study Guide
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Review
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                            • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                              • Launch Lab Inferring What You Cant Observe
                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                              • Section 1 Structure of the Atom
                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling an Aluminum Atom
                                                                                                                                                                                                                                                                                                                                • Visualizing The Atomic Model
                                                                                                                                                                                                                                                                                                                                  • Section 2 Masses of Atoms
                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                    • Applying Science How can radioactive isotopes help tell time
                                                                                                                                                                                                                                                                                                                                      • Section 3 The Periodic Table
                                                                                                                                                                                                                                                                                                                                        • MiniLAB Organizing a Personal Periodic Table
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Career
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                                                                                                                                                                        • Lab A Periodic Table of Foods
                                                                                                                                                                                                                                                                                                                                        • Lab Use the Internet Whats in a name
                                                                                                                                                                                                                                                                                                                                        • Science and History A Chilling Story
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Study Guide
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Review
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                            • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                              • Launch Lab Earth Materials at Home and School
                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                              • Section 1 Minerals
                                                                                                                                                                                                                                                                                                                                                • MiniLAB Identifying Salts Crystal System
                                                                                                                                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                • Lab Be a Mineral Detective
                                                                                                                                                                                                                                                                                                                                                  • Section 2 Igneous Rocks
                                                                                                                                                                                                                                                                                                                                                    • Applying Math Extrusive Igneous Rock Classification
                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                      • Section 3 Sedimentary Rocks
                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Evaporites
                                                                                                                                                                                                                                                                                                                                                          • Section 4 Metamorphic Rocks and the Rock Cycle
                                                                                                                                                                                                                                                                                                                                                            • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                            • Visualizing Shock Metamorphic Rock
                                                                                                                                                                                                                                                                                                                                                            • Lab Identifying Rocks
                                                                                                                                                                                                                                                                                                                                                            • Science and Society Earth Materials at Work
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Study Guide
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Review
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                  • Launch Lab Have you got the time
                                                                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                                                                  • Section 1 Weathering and Soil
                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing a Disappearing Seasoning
                                                                                                                                                                                                                                                                                                                                                                    • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                    • Lab Graphing Soil Textures
                                                                                                                                                                                                                                                                                                                                                                      • Section 2 Shaping the Landscape
                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Runoff
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                          • Section 3 Groundwater
                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Porosity Volume
                                                                                                                                                                                                                                                                                                                                                                            • Visualizing The Role of Groundwater in Shaping Earths Surface
                                                                                                                                                                                                                                                                                                                                                                            • Integrate Environment
                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                              • Section 4 Geologic Time
                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                                                                                                • Lab Its about time - relative that is
                                                                                                                                                                                                                                                                                                                                                                                • Science and Society Tapping into the Underground
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Review
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                      • Unit 6 Interactions of Matter
                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                          • Lab Chemical Bonds and Mixing
                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Stability in Bonding
                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                            • Lab Atomic Trading Cards
                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Types of Bonds
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Observing a Bond Type
                                                                                                                                                                                                                                                                                                                                                                                                • Visualizing Polar Molecules
                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Writing Formulas and Naming Compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math Determining a Formula
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Science Can you name binary ionic compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Making a Hydrate
                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Model and Invent - Modeling Chemical Bonding
                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Sticky Subject
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Review
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab RustingmdashA Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Chemical Changes
                                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Designing a Team Equation
                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Chemical Equations
                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math Barium Sulfate Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Classifying Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 4 Reaction Rates and Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing Chemical Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Creating a Colorful Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab To Glow or Not to Glow
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Investigating Reaction Conditions
                                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Clumsy Move Pays Off
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Review
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab Magic Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 How Solutions Form
                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                                                                                                                                                                                                                                                            • Visualizing Metal Alloys
                                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Observing the Effect of Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Solubility and Concentration
                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Acids Bases and Salts
                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing Acid Relief
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Strength of Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Determining Acidity
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Saturated Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and Society Acid Rain
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab The Size of a Nucleus
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Strong Force
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Nuclear Decay
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Detecting Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math The Age of Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Social Studies
                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Nuclear Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling a Nuclear Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Visualizing PET Scans
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Chain Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Model and Invent Modeling Transmutations
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and History The Nuclear Alchemist
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 26 Stars and Galaxies
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab Stars in the Sky
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Observing the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling a Telescope
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math The Magnifying Power of Telescopes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Evolution of Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Counting Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing H-R Diagrams of Star Clusters
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Star Cluster Age
                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 3 Galaxies and the Milky Way
                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 4 Cosmology
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Lab Model and Invent - Expansion of the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Science and Language Arts Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Student Resources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Skill Handbook
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Reference Handbook
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Minerals
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Physical Science Reference Tables
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Periodic Table of the Elements
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter Resources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 1 The Nature of Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 2 Science Technology and Society
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 3 Motion Acceleration and Forces
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 4 The Laws of Motion
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 5 Energy
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 6 Work and Machines
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 8 The Solar System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 9 Heat and States of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 10 Waves
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 11 Sound and Light
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 26 Stars and Galaxies
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Page 32: 706 S1 318-326 GPS09 - Light-and-Sound - home · PDF fileWhat sound does a ruler make? ... sound waves cannot travel in empty space where there are no particles. ... sound travels

Use the illustration below to answer question 15

15 Describe how the position of the candlechanged if the image of the candle movedaway from the focal point

16 Apply Acoustic scientists sometimes doresearch in rooms that absorb all soundwaves How could such a room be used tostudy how bats find their food

17 Compare White light passes through atranslucent pane of glass and shines on ashirt Both the translucent glass and theshirt appear green Compare the colors oflight that are absorbed and transmitted bythe glass and the shirt

18 Infer Most mammals including dogs andcats canrsquot see colors Infer how the retinaof a catrsquos eye might be different from theretina of a human eye

19 Determine whether a convex lens could forman image that is enlarged real and upright

20 Infer A car comes to a railroad crossingThe driver hears a trainrsquos whistle and itspitch becomes lower What can beassumed about how the train is moving

21 Compare and contrast the reflection of lightfrom a white wall with a rough surfacewith the reflection of light from a mirror

Optical axis

One

focal

length

Two

focal

lengths

Image

Ray A

Object

Focal

point

Interpreting Graphics 22 Infer why a convex mirror and a concavelens can never produce a real image

23 Predict what color a white shirt wouldappear to be if the light reflected from theshirt passed through a red filter and thenthrough a green filter

24 Explain why windows might begin to rattlewhen an airplane flies overhead

25 Communicate Some people enjoy usingsnowmobiles Others object to the noisethat they make Write a proposal for a pol-icy that seems fair to both groups for theuse of snowmobiles in a state park

CHAPTER REVIEW 349

Use the wave speed equation ν ƒλ to answer

questions 26 and 27

26 Calculate Frequency A sonar pulse has awavelength of 30 cm and a speed inwater of 1500 ms Find its frequency

27 Calculate Wavelength What is the wave-length of a sound wave with a fre-quency of 440 Hz if the speed of soundin air is 340 ms

28 Calculate Angle of Incidence A light ray isreflected from a mirror If the anglebetween the incident ray and thereflected ray is 136deg what is the angleof incidence

29 Determine Object Distance You hold anobject in front of a concave mirror witha focal length of 30 cm If you do notsee a reflected image how far from themirror is the object

30 Calculate Speed The speed of light in avacuum is 300000 kms If the index ofrefraction of water is 133 what is thespeed of light in water

More Chapter Review gpesciencecom

1 Which of the following describes the imageformed by a convex mirror

A enlarged

B inverted

C real

D virtual

Use the figure below to answer question 2

2 Which of the following describes a light raythat passes through the focal point andthen is reflected by the mirror

A It travels parallel to the optical axis

B It forms a real image

C It is reflected back through the focal point

D It forms a virtual image

3 Why does an apple look red

A It reflects red light

B It absorbs red light

C It reflects green and blue light

D It reflects all colors of light except red

Use the figure below to answer questions 4 and 5

4 When the primary colors of light are addedtogether what color appears in area H

A cyan

B magenta

C white

D yellow

5 When the primary colors of light are addedtogether what color appears in area G

A cyan

B magenta

C white

D yellow

6 Which of the following increases as the fre-quency of a sound increases

A amplitude

B intensity

C loudness

D pitch

Red Blue

Green

F

H

G K

Focal pointOptical axis

350 STANDARDIZED TEST PRACTICE

Record your answers on the answer sheet provided by your teacher or on a sheet of paper

STANDARDIZED TEST PRACTICE 351

7 Which of the following parts of the eyeenable you to see colors in bright light

A cone cells

B cornea

C lens

D rod cells

Use the graph below to answer questions 8 and 9

8 Determine how far in centimeters theimage is from the lens when the object is15 centimeters from the lens

9 How far in centimeters is the object fromthe lens when the image distance andobject distance are equal

10 A shirt has stripes that are black and whitein white light If green light shines on thisshirt what colors will the black and whitestripes be

11 If you are on a moving train what hap-pens to the pitch of a crossing bell as youapproach the crossing and then moveaway from the crossing

Use the figure below to answer question 12

12 Describe the vision problem show by thefigure and explain how this vision prob-lem can be corrected

13 Explain why the human eye can see colorsbetter in bright light than in dim light

Image Distance fora Convex Lens

Ima

ge

dis

tan

ce (

cm)

30

25

20

15

10

5 10 15 20 25 30

Object distance (cm)

Standardized Test Practice gpesciencecom

Note Units Read carefully and make note of the units used in

any measurement

  • Glencoe Physical Science with Earth Science
    • Student Edition Table of Contents
      • Unit 1 Science and Technology
        • Chapter 1 The Nature of Science
          • Launch Lab Understanding Measurements
          • Foldables
          • Section 1 The Methods of Science
            • Science Online
            • Integrate History
            • Integrate Earth Science
            • Science Online
              • Section 2 Standards of Measurement
                • Applying Math Centimeters
                • Integrate Earth Science
                • Science Online
                • MiniLAB Determining the Density of a Pencil
                • Visualizing SI Dimensions
                  • Section 3 Communicating with Graphs
                    • Applying Math Temperature
                    • MiniLAB Graphing Temperature Change
                    • Lab Whats my graph
                    • Lab Design Your Own - Developing a Measurement System
                    • Science and Language Arts Thinking in Pictures and Other Reports from My Life with Autism
                      • Chapter 1 Study Guide
                      • Chapter 1 Review
                      • Chapter 1 Standardized Test Practice
                        • Chapter 2 Science Technology and Society
                          • Lab Technology in Your Life
                          • Foldables
                          • Section 1 Science and Technology
                            • MiniLAB Researching the Past
                            • Visualizing Technology Supplying Basic Needs
                            • Science Online
                              • Section 2 Forces that Shape Technology
                                • MiniLAB Evaluating the Benefits and Consequences of Technology
                                • Integrate Environment
                                • Integrate History
                                • Applying Science What impact does the accident at Chernobyl have on the future of nuclear power
                                • Science Online
                                • Lab Who contributes CO2
                                  • Section 3 Developing Technology
                                    • Integrate Life Science
                                    • Integrate Career
                                    • Lab Model and Invent - Care Package
                                    • Oops Accidents in Science A Slippery Situation
                                      • Chapter 2 Study Guide
                                      • Chapter 2 Review
                                      • Chapter 2 Standardized Test Practice
                                          • Unit 2 Motion Forces and Energy
                                            • Chapter 3 Motion Acceleration and Forces
                                              • Launch Lab Compare Speeds
                                              • Foldables
                                              • Section 1 Describing Motion
                                                • MiniLAB Measuring Average Speed
                                                • Science Online
                                                • Applying Math Average Speed
                                                • Integrate Astronomy
                                                • Science Online
                                                  • Section 2 Acceleration
                                                    • Integrate History
                                                    • Visualizing Acceleration
                                                      • Section 3 Motion and Forces
                                                        • Science Online
                                                        • MiniLAB Comparing Friction
                                                        • Lab Force and Acceleration
                                                        • Lab Design Your Own - Comparing Motion from Different Forces
                                                        • Science and Language Arts A Brave and Startling Truth
                                                          • Chapter 3 Study Guide
                                                          • Chapter 3 Review
                                                          • Chapter 3 Standardized Test Practice
                                                            • Chapter 4 The Laws of Motion
                                                              • Launch Lab The Force of Gravity
                                                              • Foldables
                                                              • Section 1 The First Two Laws of Motion
                                                                • MiniLAB Observing Inertia
                                                                • Science Online
                                                                • Applying Math The Acceleration of a Sled Solve a Simple Equation
                                                                  • Section 2 Gravity
                                                                    • Science Online
                                                                    • Integrate Earth Science
                                                                    • MiniLAB Observing Centripetal Force
                                                                    • Lab Gravity and Air Resistance
                                                                      • Section 3 The Third Law of Motion
                                                                        • Integrate Career
                                                                        • Visualizing Rocket Motion
                                                                        • Applying Math The Momentum of a Sprinter
                                                                        • Lab The Momentum of Colliding Objects
                                                                        • Science and History Newton and the Plague
                                                                          • Chapter 4 Study Guide
                                                                          • Chapter 4 Review
                                                                          • Chapter 4 Standardized Test Practice
                                                                            • Chapter 5 Energy
                                                                              • Launch Lab Energy Conversions
                                                                              • Foldables
                                                                              • Section 1 The Nature of Energy
                                                                                • Science Online
                                                                                • Applying Math Kinetic Energy
                                                                                • MiniLAB Interpreting Data from a Slingshot
                                                                                • Integrate Language Arts
                                                                                • Applying Math Gravitational Potential Energy
                                                                                • Lab Bouncing Balls
                                                                                  • Section 2 Conservation of Energy
                                                                                    • Visualizing Energy Transformations
                                                                                    • Integrate Environment
                                                                                    • MiniLAB Transforming Energy in a Paper Clip
                                                                                    • Science Online
                                                                                    • Integrate Health
                                                                                    • Lab Design Your Own - Swinging Energy
                                                                                    • Science and History The Impossible Dream
                                                                                      • Chapter 5 Study Guide
                                                                                      • Chapter 5 Review
                                                                                      • Chapter 5 Standardized Test Practice
                                                                                        • Chapter 6 Work and Machines
                                                                                          • Launch Lab Doing Work with a Simple Machine
                                                                                          • Foldables
                                                                                          • Section 1 Work
                                                                                            • Integrate Language Arts
                                                                                            • Applying Math Work
                                                                                            • MiniLAB Calculating Your Work and Power
                                                                                            • Applying Math Power
                                                                                              • Section 2 Using Machines
                                                                                                • MiniLAB Machines Multiplying Force
                                                                                                • Science Online
                                                                                                • Integrate Chemistry
                                                                                                  • Section 3 Simple Machines
                                                                                                    • Integrate History
                                                                                                    • Visualizing Levers in the Human Body
                                                                                                    • Science Online
                                                                                                    • Lab Levers
                                                                                                    • Lab Model and Invent - Using Simple Machines
                                                                                                    • Science and Society The Science of Very Very Small
                                                                                                      • Chapter 6 Study Guide
                                                                                                      • Chapter 6 Review
                                                                                                      • Chapter 6 Standardized Test Practice
                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                          • Launch Lab Relative Sizes of Earth the Moon and the Sun
                                                                                                          • Foldables
                                                                                                          • Section 1 Earth in Space
                                                                                                            • Science Online
                                                                                                            • Integrate Physics
                                                                                                              • Section 2 Time and Seasons
                                                                                                                • MiniLAB Modeling the Suns Rays at Solstice
                                                                                                                • Lab Comparing the Angle of Sunlight to Intensity
                                                                                                                  • Section 3 Earths Moon
                                                                                                                    • Applying Math Tides
                                                                                                                    • MiniLAB Modeling Phases and Eclipses
                                                                                                                    • Integrate History
                                                                                                                    • Integrate History
                                                                                                                    • Science Online
                                                                                                                    • Visualizing Water on the Moon
                                                                                                                    • Lab Identifying the Moons Surface Features and Apollo Landing Sites
                                                                                                                    • Oops Accidents in Science Even Great Scientists Make Mistakes
                                                                                                                      • Chapter 7 Study Guide
                                                                                                                      • Chapter 7 Review
                                                                                                                      • Chapter 7 Standardized Test Practice
                                                                                                                        • Chapter 8 The Solar System
                                                                                                                          • Launch Lab The Size of the Solar System
                                                                                                                          • Foldables
                                                                                                                          • Section 1 Planet Motion
                                                                                                                            • Integrate History
                                                                                                                            • MiniLAB Plotting Retrograde Motion
                                                                                                                            • Integrate Physics
                                                                                                                            • Applying Math Heliocentric Longitude (HL)
                                                                                                                              • Section 2 The Inner Planets
                                                                                                                                • Science Online
                                                                                                                                • Integrate Chemistry
                                                                                                                                • Lab Interpreting Features of Marss Surface
                                                                                                                                  • Section 3 The Outer Planets
                                                                                                                                    • Integrate Language Arts
                                                                                                                                    • Visualizing What Galileo Saw
                                                                                                                                    • Science Online
                                                                                                                                    • MiniLAB Comparing Sizes of Outer and Inner Planets
                                                                                                                                      • Section 4 Life in the Solar System
                                                                                                                                        • Lab Design Your Own - Testing Unknown Soil Samples for Life
                                                                                                                                        • Science Stats Night Sky Wonders
                                                                                                                                          • Chapter 8 Study Guide
                                                                                                                                          • Chapter 8 Review
                                                                                                                                          • Chapter 8 Standardized Test Practice
                                                                                                                                              • Unit 3 Energy in Motion
                                                                                                                                                • Chapter 9 Heat and States of Matter
                                                                                                                                                  • Launch Lab Expansion of a Gas
                                                                                                                                                  • Foldables
                                                                                                                                                  • Section 1 Temperature and Thermal Energy
                                                                                                                                                    • Applying Math Converting to Celsius
                                                                                                                                                    • Science Online
                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                    • Applying Math Change in Thermal Energy
                                                                                                                                                      • Section 2 States of Matter
                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                        • Science Online
                                                                                                                                                        • MiniLAB Comparing States of Water
                                                                                                                                                          • Section 3 Transferring Thermal Energy
                                                                                                                                                            • MiniLAB Comparing Thermal Conductors
                                                                                                                                                            • Visualizing Convection Currents
                                                                                                                                                            • Lab Convection in Gases and Liquids
                                                                                                                                                              • Section 4 Using Thermal Energy
                                                                                                                                                                • Integrate History
                                                                                                                                                                • Science Online
                                                                                                                                                                • Lab Conduction in Gases
                                                                                                                                                                • Science Stats Surprising Thermal Energy
                                                                                                                                                                  • Chapter 9 Study Guide
                                                                                                                                                                  • Chapter 9 Review
                                                                                                                                                                  • Chapter 9 Standardized Test Practice
                                                                                                                                                                    • Chapter 10 Waves
                                                                                                                                                                      • Launch Lab How do waves transfer energy
                                                                                                                                                                      • Foldables
                                                                                                                                                                      • Section 1 The Nature of Waves
                                                                                                                                                                        • Visualizing Formation of Ocean Waves
                                                                                                                                                                        • Science Online
                                                                                                                                                                          • Section 2 Wave Properties
                                                                                                                                                                            • MiniLAB Observing Wavelength
                                                                                                                                                                            • Integrate Social Studies
                                                                                                                                                                            • Applying Math The Speed of Sound
                                                                                                                                                                            • Lab Wave Speed and Tension
                                                                                                                                                                              • Section 3 The Behavior of Waves
                                                                                                                                                                                • Science Online
                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                • MiniLAB Experimenting with Resonance
                                                                                                                                                                                • Lab Measuring Wave Properties
                                                                                                                                                                                • Science and History Making Waves
                                                                                                                                                                                  • Chapter 10 Study Guide
                                                                                                                                                                                  • Chapter 10 Review
                                                                                                                                                                                  • Chapter 10 Standardized Test Practice
                                                                                                                                                                                    • Chapter 11 Sound and Light
                                                                                                                                                                                      • Launch Lab What sound does a ruler make
                                                                                                                                                                                      • Foldables
                                                                                                                                                                                      • Section 1 Sound
                                                                                                                                                                                        • MiniLAB Comparing Intensity
                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                        • Science Online
                                                                                                                                                                                        • Applying Math Using Sonar
                                                                                                                                                                                          • Section 2 Reflection and Refraction of Light
                                                                                                                                                                                          • Section 3 Mirrors Lenses and the Eye
                                                                                                                                                                                            • Visualizing Images Formed by a Convex Lens
                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                            • MiniLAB Experimenting with Focal Lengths
                                                                                                                                                                                            • Lab Reflections of Reflections
                                                                                                                                                                                              • Section 4 Light and Color
                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Lab Design Your Own - Blocking Noise Pollution
                                                                                                                                                                                                • Science and Language Arts A Haiku Garden The Four Seasons in Poems and Print
                                                                                                                                                                                                  • Chapter 11 Study Guide
                                                                                                                                                                                                  • Chapter 11 Review
                                                                                                                                                                                                  • Chapter 11 Standardized Test Practice
                                                                                                                                                                                                    • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                      • Launch Lab Global Jigsaw Puzzle
                                                                                                                                                                                                      • Foldables
                                                                                                                                                                                                      • Section 1 Evolution of Earths Crust
                                                                                                                                                                                                        • Applying Math Spreading Distances
                                                                                                                                                                                                        • Integrate Physics
                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                          • Section 2 Earthquakes
                                                                                                                                                                                                            • MiniLAB Demonstrating Four Types of Stress
                                                                                                                                                                                                            • Visualizing Earthquake-Proof Buildings
                                                                                                                                                                                                              • Section 3 Earths Interior
                                                                                                                                                                                                              • Section 4 Volcanoes
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • MiniLAB Modeling Lava Viscosity
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                • Lab A Case for Pacific Plate Motion
                                                                                                                                                                                                                • Lab Earthquake Earthquake Wheres the earthquake
                                                                                                                                                                                                                • Science and History Volcano Weather
                                                                                                                                                                                                                  • Chapter 12 Study Guide
                                                                                                                                                                                                                  • Chapter 12 Review
                                                                                                                                                                                                                  • Chapter 12 Standardized Test Practice
                                                                                                                                                                                                                      • Unit 4 Forms of Energy
                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                          • Launch Lab Electric Circuits
                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                          • Section 1 Electric Charge
                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                            • Visualizing Lightning
                                                                                                                                                                                                                            • MiniLAB Investigate Charged Objects
                                                                                                                                                                                                                              • Section 2 Electric Current
                                                                                                                                                                                                                                • MiniLAB Investigating Battery Addition
                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                • Lab Identifying Conductors and Insulators
                                                                                                                                                                                                                                  • Section 3 Electrical Energy
                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                    • Applying Math Power Used by a Clothes Dryer
                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                    • Applying Math Electrical Energy Used by a Microwave Oven
                                                                                                                                                                                                                                    • Lab Design Your Own - Comparing Series and Parallel Circuits
                                                                                                                                                                                                                                    • Science and Language Arts Invisible Man
                                                                                                                                                                                                                                      • Chapter 13 Study Guide
                                                                                                                                                                                                                                      • Chapter 13 Review
                                                                                                                                                                                                                                      • Chapter 13 Standardized Test Practice
                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                          • Launch Lab The Strength of Magnets
                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                          • Section 1 Magnetism
                                                                                                                                                                                                                                            • MiniLAB Observing Magnetic Interference
                                                                                                                                                                                                                                            • Integrate Earth Science
                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                            • Applying Science How can magnetic parts of a junk car be salvaged
                                                                                                                                                                                                                                            • MiniLAB Making Your Own Compass
                                                                                                                                                                                                                                              • Section 2 Electricity and Magnetism
                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                  • Section 3 Producing Electric Current
                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                    • Visualizing Motors and Generators
                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                    • Lab Electricity and Magnetism
                                                                                                                                                                                                                                                    • Lab Design Your Own - Controlling Electromagnets
                                                                                                                                                                                                                                                    • Science and History Body Art
                                                                                                                                                                                                                                                      • Chapter 14 Study Guide
                                                                                                                                                                                                                                                      • Chapter 14 Review
                                                                                                                                                                                                                                                      • Chapter 14 Standardized Test Practice
                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                          • Launch Lab Can electromagnetic waves change materials
                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                          • Section 1 What are electromagnetic waves
                                                                                                                                                                                                                                                            • MiniLAB Investigating Electromagnetic Waves
                                                                                                                                                                                                                                                            • Applying Math The Speed of Light in Water
                                                                                                                                                                                                                                                              • Section 2 The Electromagnetic Spectrum
                                                                                                                                                                                                                                                                • MiniLAB Heating with Microwaves
                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                • Lab The Shape of Satellite Dishes
                                                                                                                                                                                                                                                                  • Section 3 Radio Communication
                                                                                                                                                                                                                                                                    • Visualizing Radio Broadcasts
                                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Lab Use the Internet - Radio Frequencies
                                                                                                                                                                                                                                                                    • Science and History Riding a Beam of Light
                                                                                                                                                                                                                                                                      • Chapter 15 Study Guide
                                                                                                                                                                                                                                                                      • Chapter 15 Review
                                                                                                                                                                                                                                                                      • Chapter 15 Standardized Test Practice
                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                          • Launch Lab Heating with Solar Energy
                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                          • Section 1 Fossil Fuels
                                                                                                                                                                                                                                                                            • Visualizing The Formation of Fossil Fuels
                                                                                                                                                                                                                                                                            • MiniLAB Designing an Efficient Water Heater
                                                                                                                                                                                                                                                                              • Section 2 Nuclear Energy
                                                                                                                                                                                                                                                                                • Integrate Earth Science
                                                                                                                                                                                                                                                                                • Integrate Social Science
                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                • Applying Science Can a contaminated radioactive site be reclaimed
                                                                                                                                                                                                                                                                                  • Section 3 Renewable Energy Sources
                                                                                                                                                                                                                                                                                    • MiniLAB Using Solar Power at Home
                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                    • Lab Solar Heating
                                                                                                                                                                                                                                                                                    • Lab Use the Internet How much does energy really cost
                                                                                                                                                                                                                                                                                    • Science and Society Reacting to Nuclear Energy
                                                                                                                                                                                                                                                                                      • Chapter 16 Study Guide
                                                                                                                                                                                                                                                                                      • Chapter 16 Review
                                                                                                                                                                                                                                                                                      • Chapter 16 Standardized Test Practice
                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                          • Lab Atmospheric Pressure
                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                          • Section 1 Earths Atmosphere
                                                                                                                                                                                                                                                                                            • MiniLAB Visualizing Convection
                                                                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                                                                            • Lab Visualizing a Temperature Inversion
                                                                                                                                                                                                                                                                                              • Section 2 Weather
                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Coriolis Effect
                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                  • Section 3 Climate
                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                    • Visualizing Earths Biogeophysical System
                                                                                                                                                                                                                                                                                                      • Section 4 Earths Changing Climates
                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                        • Applying Math Carbon Dioxide (CO2) Concentration
                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Investigating Microclimate
                                                                                                                                                                                                                                                                                                        • Science and Language Arts The Grapes of Wrath
                                                                                                                                                                                                                                                                                                          • Chapter 17 Study Guide
                                                                                                                                                                                                                                                                                                          • Chapter 17 Review
                                                                                                                                                                                                                                                                                                          • Chapter 17 Standardized Test Practice
                                                                                                                                                                                                                                                                                                              • Unit 5 Matter and Earth Materials
                                                                                                                                                                                                                                                                                                                • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                  • Launch Lab Demonstrate the Distillation of Water
                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                  • Section 1 Composition of Matter
                                                                                                                                                                                                                                                                                                                    • Visualizing Elements
                                                                                                                                                                                                                                                                                                                    • MiniLAB Classifying Materials
                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                    • Lab Comparing Pure Substances and Mixtures
                                                                                                                                                                                                                                                                                                                      • Section 2 Properties of Matter
                                                                                                                                                                                                                                                                                                                        • Integrate Environment
                                                                                                                                                                                                                                                                                                                        • MiniLAB Separating Ink
                                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                                        • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                        • Applying Math The Law of Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Measuring the Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Science Stats Intriguing Elements
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Study Guide
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Review
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                            • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                              • Launch Lab Inferring What You Cant Observe
                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                              • Section 1 Structure of the Atom
                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling an Aluminum Atom
                                                                                                                                                                                                                                                                                                                                • Visualizing The Atomic Model
                                                                                                                                                                                                                                                                                                                                  • Section 2 Masses of Atoms
                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                    • Applying Science How can radioactive isotopes help tell time
                                                                                                                                                                                                                                                                                                                                      • Section 3 The Periodic Table
                                                                                                                                                                                                                                                                                                                                        • MiniLAB Organizing a Personal Periodic Table
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Career
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                                                                                                                                                                        • Lab A Periodic Table of Foods
                                                                                                                                                                                                                                                                                                                                        • Lab Use the Internet Whats in a name
                                                                                                                                                                                                                                                                                                                                        • Science and History A Chilling Story
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Study Guide
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Review
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                            • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                              • Launch Lab Earth Materials at Home and School
                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                              • Section 1 Minerals
                                                                                                                                                                                                                                                                                                                                                • MiniLAB Identifying Salts Crystal System
                                                                                                                                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                • Lab Be a Mineral Detective
                                                                                                                                                                                                                                                                                                                                                  • Section 2 Igneous Rocks
                                                                                                                                                                                                                                                                                                                                                    • Applying Math Extrusive Igneous Rock Classification
                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                      • Section 3 Sedimentary Rocks
                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Evaporites
                                                                                                                                                                                                                                                                                                                                                          • Section 4 Metamorphic Rocks and the Rock Cycle
                                                                                                                                                                                                                                                                                                                                                            • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                            • Visualizing Shock Metamorphic Rock
                                                                                                                                                                                                                                                                                                                                                            • Lab Identifying Rocks
                                                                                                                                                                                                                                                                                                                                                            • Science and Society Earth Materials at Work
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Study Guide
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Review
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                  • Launch Lab Have you got the time
                                                                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                                                                  • Section 1 Weathering and Soil
                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing a Disappearing Seasoning
                                                                                                                                                                                                                                                                                                                                                                    • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                    • Lab Graphing Soil Textures
                                                                                                                                                                                                                                                                                                                                                                      • Section 2 Shaping the Landscape
                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Runoff
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                          • Section 3 Groundwater
                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Porosity Volume
                                                                                                                                                                                                                                                                                                                                                                            • Visualizing The Role of Groundwater in Shaping Earths Surface
                                                                                                                                                                                                                                                                                                                                                                            • Integrate Environment
                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                              • Section 4 Geologic Time
                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                                                                                                • Lab Its about time - relative that is
                                                                                                                                                                                                                                                                                                                                                                                • Science and Society Tapping into the Underground
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Review
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                      • Unit 6 Interactions of Matter
                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                          • Lab Chemical Bonds and Mixing
                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Stability in Bonding
                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                            • Lab Atomic Trading Cards
                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Types of Bonds
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Observing a Bond Type
                                                                                                                                                                                                                                                                                                                                                                                                • Visualizing Polar Molecules
                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Writing Formulas and Naming Compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math Determining a Formula
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Science Can you name binary ionic compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Making a Hydrate
                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Model and Invent - Modeling Chemical Bonding
                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Sticky Subject
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Review
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab RustingmdashA Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Chemical Changes
                                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Designing a Team Equation
                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Chemical Equations
                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math Barium Sulfate Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Classifying Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 4 Reaction Rates and Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing Chemical Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Creating a Colorful Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab To Glow or Not to Glow
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Investigating Reaction Conditions
                                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Clumsy Move Pays Off
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Review
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab Magic Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 How Solutions Form
                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                                                                                                                                                                                                                                                            • Visualizing Metal Alloys
                                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Observing the Effect of Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Solubility and Concentration
                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Acids Bases and Salts
                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing Acid Relief
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Strength of Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Determining Acidity
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Saturated Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and Society Acid Rain
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab The Size of a Nucleus
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Strong Force
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Nuclear Decay
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Detecting Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math The Age of Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Social Studies
                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Nuclear Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling a Nuclear Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Visualizing PET Scans
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Chain Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Model and Invent Modeling Transmutations
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and History The Nuclear Alchemist
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 26 Stars and Galaxies
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab Stars in the Sky
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Observing the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling a Telescope
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math The Magnifying Power of Telescopes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Evolution of Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Counting Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing H-R Diagrams of Star Clusters
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Star Cluster Age
                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 3 Galaxies and the Milky Way
                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 4 Cosmology
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Lab Model and Invent - Expansion of the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Science and Language Arts Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Student Resources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Skill Handbook
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Scientific Methods
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Safety Symbols
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Safety in the Science Laboratory
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Math Skill Handbook
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Math Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Science Applications
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Formulas
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Extra Math Problems
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Reference Handbook
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Minerals
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Physical Science Reference Tables
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Periodic Table of the Elements
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Weather Map Symbols
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                • EnglishSpanish Glossary
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Index
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Credits
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Students Workbooks
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter Resources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 1 The Nature of Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 2 Science Technology and Society
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 3 Motion Acceleration and Forces
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 4 The Laws of Motion
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 5 Energy
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 6 Work and Machines
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 8 The Solar System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 9 Heat and States of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 10 Waves
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 11 Sound and Light
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 26 Stars and Galaxies
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Additional Resources
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Page 33: 706 S1 318-326 GPS09 - Light-and-Sound - home · PDF fileWhat sound does a ruler make? ... sound waves cannot travel in empty space where there are no particles. ... sound travels

1 Which of the following describes the imageformed by a convex mirror

A enlarged

B inverted

C real

D virtual

Use the figure below to answer question 2

2 Which of the following describes a light raythat passes through the focal point andthen is reflected by the mirror

A It travels parallel to the optical axis

B It forms a real image

C It is reflected back through the focal point

D It forms a virtual image

3 Why does an apple look red

A It reflects red light

B It absorbs red light

C It reflects green and blue light

D It reflects all colors of light except red

Use the figure below to answer questions 4 and 5

4 When the primary colors of light are addedtogether what color appears in area H

A cyan

B magenta

C white

D yellow

5 When the primary colors of light are addedtogether what color appears in area G

A cyan

B magenta

C white

D yellow

6 Which of the following increases as the fre-quency of a sound increases

A amplitude

B intensity

C loudness

D pitch

Red Blue

Green

F

H

G K

Focal pointOptical axis

350 STANDARDIZED TEST PRACTICE

Record your answers on the answer sheet provided by your teacher or on a sheet of paper

STANDARDIZED TEST PRACTICE 351

7 Which of the following parts of the eyeenable you to see colors in bright light

A cone cells

B cornea

C lens

D rod cells

Use the graph below to answer questions 8 and 9

8 Determine how far in centimeters theimage is from the lens when the object is15 centimeters from the lens

9 How far in centimeters is the object fromthe lens when the image distance andobject distance are equal

10 A shirt has stripes that are black and whitein white light If green light shines on thisshirt what colors will the black and whitestripes be

11 If you are on a moving train what hap-pens to the pitch of a crossing bell as youapproach the crossing and then moveaway from the crossing

Use the figure below to answer question 12

12 Describe the vision problem show by thefigure and explain how this vision prob-lem can be corrected

13 Explain why the human eye can see colorsbetter in bright light than in dim light

Image Distance fora Convex Lens

Ima

ge

dis

tan

ce (

cm)

30

25

20

15

10

5 10 15 20 25 30

Object distance (cm)

Standardized Test Practice gpesciencecom

Note Units Read carefully and make note of the units used in

any measurement

  • Glencoe Physical Science with Earth Science
    • Student Edition Table of Contents
      • Unit 1 Science and Technology
        • Chapter 1 The Nature of Science
          • Launch Lab Understanding Measurements
          • Foldables
          • Section 1 The Methods of Science
            • Science Online
            • Integrate History
            • Integrate Earth Science
            • Science Online
              • Section 2 Standards of Measurement
                • Applying Math Centimeters
                • Integrate Earth Science
                • Science Online
                • MiniLAB Determining the Density of a Pencil
                • Visualizing SI Dimensions
                  • Section 3 Communicating with Graphs
                    • Applying Math Temperature
                    • MiniLAB Graphing Temperature Change
                    • Lab Whats my graph
                    • Lab Design Your Own - Developing a Measurement System
                    • Science and Language Arts Thinking in Pictures and Other Reports from My Life with Autism
                      • Chapter 1 Study Guide
                      • Chapter 1 Review
                      • Chapter 1 Standardized Test Practice
                        • Chapter 2 Science Technology and Society
                          • Lab Technology in Your Life
                          • Foldables
                          • Section 1 Science and Technology
                            • MiniLAB Researching the Past
                            • Visualizing Technology Supplying Basic Needs
                            • Science Online
                              • Section 2 Forces that Shape Technology
                                • MiniLAB Evaluating the Benefits and Consequences of Technology
                                • Integrate Environment
                                • Integrate History
                                • Applying Science What impact does the accident at Chernobyl have on the future of nuclear power
                                • Science Online
                                • Lab Who contributes CO2
                                  • Section 3 Developing Technology
                                    • Integrate Life Science
                                    • Integrate Career
                                    • Lab Model and Invent - Care Package
                                    • Oops Accidents in Science A Slippery Situation
                                      • Chapter 2 Study Guide
                                      • Chapter 2 Review
                                      • Chapter 2 Standardized Test Practice
                                          • Unit 2 Motion Forces and Energy
                                            • Chapter 3 Motion Acceleration and Forces
                                              • Launch Lab Compare Speeds
                                              • Foldables
                                              • Section 1 Describing Motion
                                                • MiniLAB Measuring Average Speed
                                                • Science Online
                                                • Applying Math Average Speed
                                                • Integrate Astronomy
                                                • Science Online
                                                  • Section 2 Acceleration
                                                    • Integrate History
                                                    • Visualizing Acceleration
                                                      • Section 3 Motion and Forces
                                                        • Science Online
                                                        • MiniLAB Comparing Friction
                                                        • Lab Force and Acceleration
                                                        • Lab Design Your Own - Comparing Motion from Different Forces
                                                        • Science and Language Arts A Brave and Startling Truth
                                                          • Chapter 3 Study Guide
                                                          • Chapter 3 Review
                                                          • Chapter 3 Standardized Test Practice
                                                            • Chapter 4 The Laws of Motion
                                                              • Launch Lab The Force of Gravity
                                                              • Foldables
                                                              • Section 1 The First Two Laws of Motion
                                                                • MiniLAB Observing Inertia
                                                                • Science Online
                                                                • Applying Math The Acceleration of a Sled Solve a Simple Equation
                                                                  • Section 2 Gravity
                                                                    • Science Online
                                                                    • Integrate Earth Science
                                                                    • MiniLAB Observing Centripetal Force
                                                                    • Lab Gravity and Air Resistance
                                                                      • Section 3 The Third Law of Motion
                                                                        • Integrate Career
                                                                        • Visualizing Rocket Motion
                                                                        • Applying Math The Momentum of a Sprinter
                                                                        • Lab The Momentum of Colliding Objects
                                                                        • Science and History Newton and the Plague
                                                                          • Chapter 4 Study Guide
                                                                          • Chapter 4 Review
                                                                          • Chapter 4 Standardized Test Practice
                                                                            • Chapter 5 Energy
                                                                              • Launch Lab Energy Conversions
                                                                              • Foldables
                                                                              • Section 1 The Nature of Energy
                                                                                • Science Online
                                                                                • Applying Math Kinetic Energy
                                                                                • MiniLAB Interpreting Data from a Slingshot
                                                                                • Integrate Language Arts
                                                                                • Applying Math Gravitational Potential Energy
                                                                                • Lab Bouncing Balls
                                                                                  • Section 2 Conservation of Energy
                                                                                    • Visualizing Energy Transformations
                                                                                    • Integrate Environment
                                                                                    • MiniLAB Transforming Energy in a Paper Clip
                                                                                    • Science Online
                                                                                    • Integrate Health
                                                                                    • Lab Design Your Own - Swinging Energy
                                                                                    • Science and History The Impossible Dream
                                                                                      • Chapter 5 Study Guide
                                                                                      • Chapter 5 Review
                                                                                      • Chapter 5 Standardized Test Practice
                                                                                        • Chapter 6 Work and Machines
                                                                                          • Launch Lab Doing Work with a Simple Machine
                                                                                          • Foldables
                                                                                          • Section 1 Work
                                                                                            • Integrate Language Arts
                                                                                            • Applying Math Work
                                                                                            • MiniLAB Calculating Your Work and Power
                                                                                            • Applying Math Power
                                                                                              • Section 2 Using Machines
                                                                                                • MiniLAB Machines Multiplying Force
                                                                                                • Science Online
                                                                                                • Integrate Chemistry
                                                                                                  • Section 3 Simple Machines
                                                                                                    • Integrate History
                                                                                                    • Visualizing Levers in the Human Body
                                                                                                    • Science Online
                                                                                                    • Lab Levers
                                                                                                    • Lab Model and Invent - Using Simple Machines
                                                                                                    • Science and Society The Science of Very Very Small
                                                                                                      • Chapter 6 Study Guide
                                                                                                      • Chapter 6 Review
                                                                                                      • Chapter 6 Standardized Test Practice
                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                          • Launch Lab Relative Sizes of Earth the Moon and the Sun
                                                                                                          • Foldables
                                                                                                          • Section 1 Earth in Space
                                                                                                            • Science Online
                                                                                                            • Integrate Physics
                                                                                                              • Section 2 Time and Seasons
                                                                                                                • MiniLAB Modeling the Suns Rays at Solstice
                                                                                                                • Lab Comparing the Angle of Sunlight to Intensity
                                                                                                                  • Section 3 Earths Moon
                                                                                                                    • Applying Math Tides
                                                                                                                    • MiniLAB Modeling Phases and Eclipses
                                                                                                                    • Integrate History
                                                                                                                    • Integrate History
                                                                                                                    • Science Online
                                                                                                                    • Visualizing Water on the Moon
                                                                                                                    • Lab Identifying the Moons Surface Features and Apollo Landing Sites
                                                                                                                    • Oops Accidents in Science Even Great Scientists Make Mistakes
                                                                                                                      • Chapter 7 Study Guide
                                                                                                                      • Chapter 7 Review
                                                                                                                      • Chapter 7 Standardized Test Practice
                                                                                                                        • Chapter 8 The Solar System
                                                                                                                          • Launch Lab The Size of the Solar System
                                                                                                                          • Foldables
                                                                                                                          • Section 1 Planet Motion
                                                                                                                            • Integrate History
                                                                                                                            • MiniLAB Plotting Retrograde Motion
                                                                                                                            • Integrate Physics
                                                                                                                            • Applying Math Heliocentric Longitude (HL)
                                                                                                                              • Section 2 The Inner Planets
                                                                                                                                • Science Online
                                                                                                                                • Integrate Chemistry
                                                                                                                                • Lab Interpreting Features of Marss Surface
                                                                                                                                  • Section 3 The Outer Planets
                                                                                                                                    • Integrate Language Arts
                                                                                                                                    • Visualizing What Galileo Saw
                                                                                                                                    • Science Online
                                                                                                                                    • MiniLAB Comparing Sizes of Outer and Inner Planets
                                                                                                                                      • Section 4 Life in the Solar System
                                                                                                                                        • Lab Design Your Own - Testing Unknown Soil Samples for Life
                                                                                                                                        • Science Stats Night Sky Wonders
                                                                                                                                          • Chapter 8 Study Guide
                                                                                                                                          • Chapter 8 Review
                                                                                                                                          • Chapter 8 Standardized Test Practice
                                                                                                                                              • Unit 3 Energy in Motion
                                                                                                                                                • Chapter 9 Heat and States of Matter
                                                                                                                                                  • Launch Lab Expansion of a Gas
                                                                                                                                                  • Foldables
                                                                                                                                                  • Section 1 Temperature and Thermal Energy
                                                                                                                                                    • Applying Math Converting to Celsius
                                                                                                                                                    • Science Online
                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                    • Applying Math Change in Thermal Energy
                                                                                                                                                      • Section 2 States of Matter
                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                        • Science Online
                                                                                                                                                        • MiniLAB Comparing States of Water
                                                                                                                                                          • Section 3 Transferring Thermal Energy
                                                                                                                                                            • MiniLAB Comparing Thermal Conductors
                                                                                                                                                            • Visualizing Convection Currents
                                                                                                                                                            • Lab Convection in Gases and Liquids
                                                                                                                                                              • Section 4 Using Thermal Energy
                                                                                                                                                                • Integrate History
                                                                                                                                                                • Science Online
                                                                                                                                                                • Lab Conduction in Gases
                                                                                                                                                                • Science Stats Surprising Thermal Energy
                                                                                                                                                                  • Chapter 9 Study Guide
                                                                                                                                                                  • Chapter 9 Review
                                                                                                                                                                  • Chapter 9 Standardized Test Practice
                                                                                                                                                                    • Chapter 10 Waves
                                                                                                                                                                      • Launch Lab How do waves transfer energy
                                                                                                                                                                      • Foldables
                                                                                                                                                                      • Section 1 The Nature of Waves
                                                                                                                                                                        • Visualizing Formation of Ocean Waves
                                                                                                                                                                        • Science Online
                                                                                                                                                                          • Section 2 Wave Properties
                                                                                                                                                                            • MiniLAB Observing Wavelength
                                                                                                                                                                            • Integrate Social Studies
                                                                                                                                                                            • Applying Math The Speed of Sound
                                                                                                                                                                            • Lab Wave Speed and Tension
                                                                                                                                                                              • Section 3 The Behavior of Waves
                                                                                                                                                                                • Science Online
                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                • MiniLAB Experimenting with Resonance
                                                                                                                                                                                • Lab Measuring Wave Properties
                                                                                                                                                                                • Science and History Making Waves
                                                                                                                                                                                  • Chapter 10 Study Guide
                                                                                                                                                                                  • Chapter 10 Review
                                                                                                                                                                                  • Chapter 10 Standardized Test Practice
                                                                                                                                                                                    • Chapter 11 Sound and Light
                                                                                                                                                                                      • Launch Lab What sound does a ruler make
                                                                                                                                                                                      • Foldables
                                                                                                                                                                                      • Section 1 Sound
                                                                                                                                                                                        • MiniLAB Comparing Intensity
                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                        • Science Online
                                                                                                                                                                                        • Applying Math Using Sonar
                                                                                                                                                                                          • Section 2 Reflection and Refraction of Light
                                                                                                                                                                                          • Section 3 Mirrors Lenses and the Eye
                                                                                                                                                                                            • Visualizing Images Formed by a Convex Lens
                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                            • MiniLAB Experimenting with Focal Lengths
                                                                                                                                                                                            • Lab Reflections of Reflections
                                                                                                                                                                                              • Section 4 Light and Color
                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Lab Design Your Own - Blocking Noise Pollution
                                                                                                                                                                                                • Science and Language Arts A Haiku Garden The Four Seasons in Poems and Print
                                                                                                                                                                                                  • Chapter 11 Study Guide
                                                                                                                                                                                                  • Chapter 11 Review
                                                                                                                                                                                                  • Chapter 11 Standardized Test Practice
                                                                                                                                                                                                    • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                      • Launch Lab Global Jigsaw Puzzle
                                                                                                                                                                                                      • Foldables
                                                                                                                                                                                                      • Section 1 Evolution of Earths Crust
                                                                                                                                                                                                        • Applying Math Spreading Distances
                                                                                                                                                                                                        • Integrate Physics
                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                          • Section 2 Earthquakes
                                                                                                                                                                                                            • MiniLAB Demonstrating Four Types of Stress
                                                                                                                                                                                                            • Visualizing Earthquake-Proof Buildings
                                                                                                                                                                                                              • Section 3 Earths Interior
                                                                                                                                                                                                              • Section 4 Volcanoes
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • MiniLAB Modeling Lava Viscosity
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                • Lab A Case for Pacific Plate Motion
                                                                                                                                                                                                                • Lab Earthquake Earthquake Wheres the earthquake
                                                                                                                                                                                                                • Science and History Volcano Weather
                                                                                                                                                                                                                  • Chapter 12 Study Guide
                                                                                                                                                                                                                  • Chapter 12 Review
                                                                                                                                                                                                                  • Chapter 12 Standardized Test Practice
                                                                                                                                                                                                                      • Unit 4 Forms of Energy
                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                          • Launch Lab Electric Circuits
                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                          • Section 1 Electric Charge
                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                            • Visualizing Lightning
                                                                                                                                                                                                                            • MiniLAB Investigate Charged Objects
                                                                                                                                                                                                                              • Section 2 Electric Current
                                                                                                                                                                                                                                • MiniLAB Investigating Battery Addition
                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                • Lab Identifying Conductors and Insulators
                                                                                                                                                                                                                                  • Section 3 Electrical Energy
                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                    • Applying Math Power Used by a Clothes Dryer
                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                    • Applying Math Electrical Energy Used by a Microwave Oven
                                                                                                                                                                                                                                    • Lab Design Your Own - Comparing Series and Parallel Circuits
                                                                                                                                                                                                                                    • Science and Language Arts Invisible Man
                                                                                                                                                                                                                                      • Chapter 13 Study Guide
                                                                                                                                                                                                                                      • Chapter 13 Review
                                                                                                                                                                                                                                      • Chapter 13 Standardized Test Practice
                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                          • Launch Lab The Strength of Magnets
                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                          • Section 1 Magnetism
                                                                                                                                                                                                                                            • MiniLAB Observing Magnetic Interference
                                                                                                                                                                                                                                            • Integrate Earth Science
                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                            • Applying Science How can magnetic parts of a junk car be salvaged
                                                                                                                                                                                                                                            • MiniLAB Making Your Own Compass
                                                                                                                                                                                                                                              • Section 2 Electricity and Magnetism
                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                  • Section 3 Producing Electric Current
                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                    • Visualizing Motors and Generators
                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                    • Lab Electricity and Magnetism
                                                                                                                                                                                                                                                    • Lab Design Your Own - Controlling Electromagnets
                                                                                                                                                                                                                                                    • Science and History Body Art
                                                                                                                                                                                                                                                      • Chapter 14 Study Guide
                                                                                                                                                                                                                                                      • Chapter 14 Review
                                                                                                                                                                                                                                                      • Chapter 14 Standardized Test Practice
                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                          • Launch Lab Can electromagnetic waves change materials
                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                          • Section 1 What are electromagnetic waves
                                                                                                                                                                                                                                                            • MiniLAB Investigating Electromagnetic Waves
                                                                                                                                                                                                                                                            • Applying Math The Speed of Light in Water
                                                                                                                                                                                                                                                              • Section 2 The Electromagnetic Spectrum
                                                                                                                                                                                                                                                                • MiniLAB Heating with Microwaves
                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                • Lab The Shape of Satellite Dishes
                                                                                                                                                                                                                                                                  • Section 3 Radio Communication
                                                                                                                                                                                                                                                                    • Visualizing Radio Broadcasts
                                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Lab Use the Internet - Radio Frequencies
                                                                                                                                                                                                                                                                    • Science and History Riding a Beam of Light
                                                                                                                                                                                                                                                                      • Chapter 15 Study Guide
                                                                                                                                                                                                                                                                      • Chapter 15 Review
                                                                                                                                                                                                                                                                      • Chapter 15 Standardized Test Practice
                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                          • Launch Lab Heating with Solar Energy
                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                          • Section 1 Fossil Fuels
                                                                                                                                                                                                                                                                            • Visualizing The Formation of Fossil Fuels
                                                                                                                                                                                                                                                                            • MiniLAB Designing an Efficient Water Heater
                                                                                                                                                                                                                                                                              • Section 2 Nuclear Energy
                                                                                                                                                                                                                                                                                • Integrate Earth Science
                                                                                                                                                                                                                                                                                • Integrate Social Science
                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                • Applying Science Can a contaminated radioactive site be reclaimed
                                                                                                                                                                                                                                                                                  • Section 3 Renewable Energy Sources
                                                                                                                                                                                                                                                                                    • MiniLAB Using Solar Power at Home
                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                    • Lab Solar Heating
                                                                                                                                                                                                                                                                                    • Lab Use the Internet How much does energy really cost
                                                                                                                                                                                                                                                                                    • Science and Society Reacting to Nuclear Energy
                                                                                                                                                                                                                                                                                      • Chapter 16 Study Guide
                                                                                                                                                                                                                                                                                      • Chapter 16 Review
                                                                                                                                                                                                                                                                                      • Chapter 16 Standardized Test Practice
                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                          • Lab Atmospheric Pressure
                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                          • Section 1 Earths Atmosphere
                                                                                                                                                                                                                                                                                            • MiniLAB Visualizing Convection
                                                                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                                                                            • Lab Visualizing a Temperature Inversion
                                                                                                                                                                                                                                                                                              • Section 2 Weather
                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Coriolis Effect
                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                  • Section 3 Climate
                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                    • Visualizing Earths Biogeophysical System
                                                                                                                                                                                                                                                                                                      • Section 4 Earths Changing Climates
                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                        • Applying Math Carbon Dioxide (CO2) Concentration
                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Investigating Microclimate
                                                                                                                                                                                                                                                                                                        • Science and Language Arts The Grapes of Wrath
                                                                                                                                                                                                                                                                                                          • Chapter 17 Study Guide
                                                                                                                                                                                                                                                                                                          • Chapter 17 Review
                                                                                                                                                                                                                                                                                                          • Chapter 17 Standardized Test Practice
                                                                                                                                                                                                                                                                                                              • Unit 5 Matter and Earth Materials
                                                                                                                                                                                                                                                                                                                • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                  • Launch Lab Demonstrate the Distillation of Water
                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                  • Section 1 Composition of Matter
                                                                                                                                                                                                                                                                                                                    • Visualizing Elements
                                                                                                                                                                                                                                                                                                                    • MiniLAB Classifying Materials
                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                    • Lab Comparing Pure Substances and Mixtures
                                                                                                                                                                                                                                                                                                                      • Section 2 Properties of Matter
                                                                                                                                                                                                                                                                                                                        • Integrate Environment
                                                                                                                                                                                                                                                                                                                        • MiniLAB Separating Ink
                                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                                        • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                        • Applying Math The Law of Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Measuring the Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Science Stats Intriguing Elements
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Study Guide
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Review
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                            • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                              • Launch Lab Inferring What You Cant Observe
                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                              • Section 1 Structure of the Atom
                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling an Aluminum Atom
                                                                                                                                                                                                                                                                                                                                • Visualizing The Atomic Model
                                                                                                                                                                                                                                                                                                                                  • Section 2 Masses of Atoms
                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                    • Applying Science How can radioactive isotopes help tell time
                                                                                                                                                                                                                                                                                                                                      • Section 3 The Periodic Table
                                                                                                                                                                                                                                                                                                                                        • MiniLAB Organizing a Personal Periodic Table
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Career
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                                                                                                                                                                        • Lab A Periodic Table of Foods
                                                                                                                                                                                                                                                                                                                                        • Lab Use the Internet Whats in a name
                                                                                                                                                                                                                                                                                                                                        • Science and History A Chilling Story
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Study Guide
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Review
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                            • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                              • Launch Lab Earth Materials at Home and School
                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                              • Section 1 Minerals
                                                                                                                                                                                                                                                                                                                                                • MiniLAB Identifying Salts Crystal System
                                                                                                                                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                • Lab Be a Mineral Detective
                                                                                                                                                                                                                                                                                                                                                  • Section 2 Igneous Rocks
                                                                                                                                                                                                                                                                                                                                                    • Applying Math Extrusive Igneous Rock Classification
                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                      • Section 3 Sedimentary Rocks
                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Evaporites
                                                                                                                                                                                                                                                                                                                                                          • Section 4 Metamorphic Rocks and the Rock Cycle
                                                                                                                                                                                                                                                                                                                                                            • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                            • Visualizing Shock Metamorphic Rock
                                                                                                                                                                                                                                                                                                                                                            • Lab Identifying Rocks
                                                                                                                                                                                                                                                                                                                                                            • Science and Society Earth Materials at Work
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Study Guide
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Review
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                  • Launch Lab Have you got the time
                                                                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                                                                  • Section 1 Weathering and Soil
                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing a Disappearing Seasoning
                                                                                                                                                                                                                                                                                                                                                                    • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                    • Lab Graphing Soil Textures
                                                                                                                                                                                                                                                                                                                                                                      • Section 2 Shaping the Landscape
                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Runoff
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                          • Section 3 Groundwater
                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Porosity Volume
                                                                                                                                                                                                                                                                                                                                                                            • Visualizing The Role of Groundwater in Shaping Earths Surface
                                                                                                                                                                                                                                                                                                                                                                            • Integrate Environment
                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                              • Section 4 Geologic Time
                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                                                                                                • Lab Its about time - relative that is
                                                                                                                                                                                                                                                                                                                                                                                • Science and Society Tapping into the Underground
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Review
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                      • Unit 6 Interactions of Matter
                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                          • Lab Chemical Bonds and Mixing
                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Stability in Bonding
                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                            • Lab Atomic Trading Cards
                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Types of Bonds
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Observing a Bond Type
                                                                                                                                                                                                                                                                                                                                                                                                • Visualizing Polar Molecules
                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Writing Formulas and Naming Compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math Determining a Formula
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Science Can you name binary ionic compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Making a Hydrate
                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Model and Invent - Modeling Chemical Bonding
                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Sticky Subject
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Review
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab RustingmdashA Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Chemical Changes
                                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Designing a Team Equation
                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Chemical Equations
                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math Barium Sulfate Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Classifying Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 4 Reaction Rates and Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing Chemical Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Creating a Colorful Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab To Glow or Not to Glow
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Investigating Reaction Conditions
                                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Clumsy Move Pays Off
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Review
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab Magic Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 How Solutions Form
                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                                                                                                                                                                                                                                                            • Visualizing Metal Alloys
                                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Observing the Effect of Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Solubility and Concentration
                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Acids Bases and Salts
                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing Acid Relief
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Strength of Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Determining Acidity
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Saturated Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and Society Acid Rain
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab The Size of a Nucleus
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Strong Force
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Nuclear Decay
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Detecting Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math The Age of Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Social Studies
                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Nuclear Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling a Nuclear Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Visualizing PET Scans
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Chain Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Model and Invent Modeling Transmutations
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and History The Nuclear Alchemist
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 26 Stars and Galaxies
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab Stars in the Sky
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Observing the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling a Telescope
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math The Magnifying Power of Telescopes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Evolution of Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Counting Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing H-R Diagrams of Star Clusters
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Star Cluster Age
                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 3 Galaxies and the Milky Way
                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 4 Cosmology
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Lab Model and Invent - Expansion of the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Science and Language Arts Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Student Resources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Skill Handbook
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Scientific Methods
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Safety Symbols
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Safety in the Science Laboratory
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Math Skill Handbook
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Math Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Science Applications
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Formulas
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Extra Math Problems
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Reference Handbook
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Minerals
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Physical Science Reference Tables
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Periodic Table of the Elements
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Weather Map Symbols
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                • EnglishSpanish Glossary
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Index
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Credits
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Students Workbooks
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter Resources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 1 The Nature of Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 2 Science Technology and Society
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 3 Motion Acceleration and Forces
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 4 The Laws of Motion
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 5 Energy
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 6 Work and Machines
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 8 The Solar System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 9 Heat and States of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 10 Waves
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 11 Sound and Light
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 26 Stars and Galaxies
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Page 34: 706 S1 318-326 GPS09 - Light-and-Sound - home · PDF fileWhat sound does a ruler make? ... sound waves cannot travel in empty space where there are no particles. ... sound travels

STANDARDIZED TEST PRACTICE 351

7 Which of the following parts of the eyeenable you to see colors in bright light

A cone cells

B cornea

C lens

D rod cells

Use the graph below to answer questions 8 and 9

8 Determine how far in centimeters theimage is from the lens when the object is15 centimeters from the lens

9 How far in centimeters is the object fromthe lens when the image distance andobject distance are equal

10 A shirt has stripes that are black and whitein white light If green light shines on thisshirt what colors will the black and whitestripes be

11 If you are on a moving train what hap-pens to the pitch of a crossing bell as youapproach the crossing and then moveaway from the crossing

Use the figure below to answer question 12

12 Describe the vision problem show by thefigure and explain how this vision prob-lem can be corrected

13 Explain why the human eye can see colorsbetter in bright light than in dim light

Image Distance fora Convex Lens

Ima

ge

dis

tan

ce (

cm)

30

25

20

15

10

5 10 15 20 25 30

Object distance (cm)

Standardized Test Practice gpesciencecom

Note Units Read carefully and make note of the units used in

any measurement

  • Glencoe Physical Science with Earth Science
    • Student Edition Table of Contents
      • Unit 1 Science and Technology
        • Chapter 1 The Nature of Science
          • Launch Lab Understanding Measurements
          • Foldables
          • Section 1 The Methods of Science
            • Science Online
            • Integrate History
            • Integrate Earth Science
            • Science Online
              • Section 2 Standards of Measurement
                • Applying Math Centimeters
                • Integrate Earth Science
                • Science Online
                • MiniLAB Determining the Density of a Pencil
                • Visualizing SI Dimensions
                  • Section 3 Communicating with Graphs
                    • Applying Math Temperature
                    • MiniLAB Graphing Temperature Change
                    • Lab Whats my graph
                    • Lab Design Your Own - Developing a Measurement System
                    • Science and Language Arts Thinking in Pictures and Other Reports from My Life with Autism
                      • Chapter 1 Study Guide
                      • Chapter 1 Review
                      • Chapter 1 Standardized Test Practice
                        • Chapter 2 Science Technology and Society
                          • Lab Technology in Your Life
                          • Foldables
                          • Section 1 Science and Technology
                            • MiniLAB Researching the Past
                            • Visualizing Technology Supplying Basic Needs
                            • Science Online
                              • Section 2 Forces that Shape Technology
                                • MiniLAB Evaluating the Benefits and Consequences of Technology
                                • Integrate Environment
                                • Integrate History
                                • Applying Science What impact does the accident at Chernobyl have on the future of nuclear power
                                • Science Online
                                • Lab Who contributes CO2
                                  • Section 3 Developing Technology
                                    • Integrate Life Science
                                    • Integrate Career
                                    • Lab Model and Invent - Care Package
                                    • Oops Accidents in Science A Slippery Situation
                                      • Chapter 2 Study Guide
                                      • Chapter 2 Review
                                      • Chapter 2 Standardized Test Practice
                                          • Unit 2 Motion Forces and Energy
                                            • Chapter 3 Motion Acceleration and Forces
                                              • Launch Lab Compare Speeds
                                              • Foldables
                                              • Section 1 Describing Motion
                                                • MiniLAB Measuring Average Speed
                                                • Science Online
                                                • Applying Math Average Speed
                                                • Integrate Astronomy
                                                • Science Online
                                                  • Section 2 Acceleration
                                                    • Integrate History
                                                    • Visualizing Acceleration
                                                      • Section 3 Motion and Forces
                                                        • Science Online
                                                        • MiniLAB Comparing Friction
                                                        • Lab Force and Acceleration
                                                        • Lab Design Your Own - Comparing Motion from Different Forces
                                                        • Science and Language Arts A Brave and Startling Truth
                                                          • Chapter 3 Study Guide
                                                          • Chapter 3 Review
                                                          • Chapter 3 Standardized Test Practice
                                                            • Chapter 4 The Laws of Motion
                                                              • Launch Lab The Force of Gravity
                                                              • Foldables
                                                              • Section 1 The First Two Laws of Motion
                                                                • MiniLAB Observing Inertia
                                                                • Science Online
                                                                • Applying Math The Acceleration of a Sled Solve a Simple Equation
                                                                  • Section 2 Gravity
                                                                    • Science Online
                                                                    • Integrate Earth Science
                                                                    • MiniLAB Observing Centripetal Force
                                                                    • Lab Gravity and Air Resistance
                                                                      • Section 3 The Third Law of Motion
                                                                        • Integrate Career
                                                                        • Visualizing Rocket Motion
                                                                        • Applying Math The Momentum of a Sprinter
                                                                        • Lab The Momentum of Colliding Objects
                                                                        • Science and History Newton and the Plague
                                                                          • Chapter 4 Study Guide
                                                                          • Chapter 4 Review
                                                                          • Chapter 4 Standardized Test Practice
                                                                            • Chapter 5 Energy
                                                                              • Launch Lab Energy Conversions
                                                                              • Foldables
                                                                              • Section 1 The Nature of Energy
                                                                                • Science Online
                                                                                • Applying Math Kinetic Energy
                                                                                • MiniLAB Interpreting Data from a Slingshot
                                                                                • Integrate Language Arts
                                                                                • Applying Math Gravitational Potential Energy
                                                                                • Lab Bouncing Balls
                                                                                  • Section 2 Conservation of Energy
                                                                                    • Visualizing Energy Transformations
                                                                                    • Integrate Environment
                                                                                    • MiniLAB Transforming Energy in a Paper Clip
                                                                                    • Science Online
                                                                                    • Integrate Health
                                                                                    • Lab Design Your Own - Swinging Energy
                                                                                    • Science and History The Impossible Dream
                                                                                      • Chapter 5 Study Guide
                                                                                      • Chapter 5 Review
                                                                                      • Chapter 5 Standardized Test Practice
                                                                                        • Chapter 6 Work and Machines
                                                                                          • Launch Lab Doing Work with a Simple Machine
                                                                                          • Foldables
                                                                                          • Section 1 Work
                                                                                            • Integrate Language Arts
                                                                                            • Applying Math Work
                                                                                            • MiniLAB Calculating Your Work and Power
                                                                                            • Applying Math Power
                                                                                              • Section 2 Using Machines
                                                                                                • MiniLAB Machines Multiplying Force
                                                                                                • Science Online
                                                                                                • Integrate Chemistry
                                                                                                  • Section 3 Simple Machines
                                                                                                    • Integrate History
                                                                                                    • Visualizing Levers in the Human Body
                                                                                                    • Science Online
                                                                                                    • Lab Levers
                                                                                                    • Lab Model and Invent - Using Simple Machines
                                                                                                    • Science and Society The Science of Very Very Small
                                                                                                      • Chapter 6 Study Guide
                                                                                                      • Chapter 6 Review
                                                                                                      • Chapter 6 Standardized Test Practice
                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                          • Launch Lab Relative Sizes of Earth the Moon and the Sun
                                                                                                          • Foldables
                                                                                                          • Section 1 Earth in Space
                                                                                                            • Science Online
                                                                                                            • Integrate Physics
                                                                                                              • Section 2 Time and Seasons
                                                                                                                • MiniLAB Modeling the Suns Rays at Solstice
                                                                                                                • Lab Comparing the Angle of Sunlight to Intensity
                                                                                                                  • Section 3 Earths Moon
                                                                                                                    • Applying Math Tides
                                                                                                                    • MiniLAB Modeling Phases and Eclipses
                                                                                                                    • Integrate History
                                                                                                                    • Integrate History
                                                                                                                    • Science Online
                                                                                                                    • Visualizing Water on the Moon
                                                                                                                    • Lab Identifying the Moons Surface Features and Apollo Landing Sites
                                                                                                                    • Oops Accidents in Science Even Great Scientists Make Mistakes
                                                                                                                      • Chapter 7 Study Guide
                                                                                                                      • Chapter 7 Review
                                                                                                                      • Chapter 7 Standardized Test Practice
                                                                                                                        • Chapter 8 The Solar System
                                                                                                                          • Launch Lab The Size of the Solar System
                                                                                                                          • Foldables
                                                                                                                          • Section 1 Planet Motion
                                                                                                                            • Integrate History
                                                                                                                            • MiniLAB Plotting Retrograde Motion
                                                                                                                            • Integrate Physics
                                                                                                                            • Applying Math Heliocentric Longitude (HL)
                                                                                                                              • Section 2 The Inner Planets
                                                                                                                                • Science Online
                                                                                                                                • Integrate Chemistry
                                                                                                                                • Lab Interpreting Features of Marss Surface
                                                                                                                                  • Section 3 The Outer Planets
                                                                                                                                    • Integrate Language Arts
                                                                                                                                    • Visualizing What Galileo Saw
                                                                                                                                    • Science Online
                                                                                                                                    • MiniLAB Comparing Sizes of Outer and Inner Planets
                                                                                                                                      • Section 4 Life in the Solar System
                                                                                                                                        • Lab Design Your Own - Testing Unknown Soil Samples for Life
                                                                                                                                        • Science Stats Night Sky Wonders
                                                                                                                                          • Chapter 8 Study Guide
                                                                                                                                          • Chapter 8 Review
                                                                                                                                          • Chapter 8 Standardized Test Practice
                                                                                                                                              • Unit 3 Energy in Motion
                                                                                                                                                • Chapter 9 Heat and States of Matter
                                                                                                                                                  • Launch Lab Expansion of a Gas
                                                                                                                                                  • Foldables
                                                                                                                                                  • Section 1 Temperature and Thermal Energy
                                                                                                                                                    • Applying Math Converting to Celsius
                                                                                                                                                    • Science Online
                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                    • Applying Math Change in Thermal Energy
                                                                                                                                                      • Section 2 States of Matter
                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                        • Science Online
                                                                                                                                                        • MiniLAB Comparing States of Water
                                                                                                                                                          • Section 3 Transferring Thermal Energy
                                                                                                                                                            • MiniLAB Comparing Thermal Conductors
                                                                                                                                                            • Visualizing Convection Currents
                                                                                                                                                            • Lab Convection in Gases and Liquids
                                                                                                                                                              • Section 4 Using Thermal Energy
                                                                                                                                                                • Integrate History
                                                                                                                                                                • Science Online
                                                                                                                                                                • Lab Conduction in Gases
                                                                                                                                                                • Science Stats Surprising Thermal Energy
                                                                                                                                                                  • Chapter 9 Study Guide
                                                                                                                                                                  • Chapter 9 Review
                                                                                                                                                                  • Chapter 9 Standardized Test Practice
                                                                                                                                                                    • Chapter 10 Waves
                                                                                                                                                                      • Launch Lab How do waves transfer energy
                                                                                                                                                                      • Foldables
                                                                                                                                                                      • Section 1 The Nature of Waves
                                                                                                                                                                        • Visualizing Formation of Ocean Waves
                                                                                                                                                                        • Science Online
                                                                                                                                                                          • Section 2 Wave Properties
                                                                                                                                                                            • MiniLAB Observing Wavelength
                                                                                                                                                                            • Integrate Social Studies
                                                                                                                                                                            • Applying Math The Speed of Sound
                                                                                                                                                                            • Lab Wave Speed and Tension
                                                                                                                                                                              • Section 3 The Behavior of Waves
                                                                                                                                                                                • Science Online
                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                • MiniLAB Experimenting with Resonance
                                                                                                                                                                                • Lab Measuring Wave Properties
                                                                                                                                                                                • Science and History Making Waves
                                                                                                                                                                                  • Chapter 10 Study Guide
                                                                                                                                                                                  • Chapter 10 Review
                                                                                                                                                                                  • Chapter 10 Standardized Test Practice
                                                                                                                                                                                    • Chapter 11 Sound and Light
                                                                                                                                                                                      • Launch Lab What sound does a ruler make
                                                                                                                                                                                      • Foldables
                                                                                                                                                                                      • Section 1 Sound
                                                                                                                                                                                        • MiniLAB Comparing Intensity
                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                        • Science Online
                                                                                                                                                                                        • Applying Math Using Sonar
                                                                                                                                                                                          • Section 2 Reflection and Refraction of Light
                                                                                                                                                                                          • Section 3 Mirrors Lenses and the Eye
                                                                                                                                                                                            • Visualizing Images Formed by a Convex Lens
                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                            • MiniLAB Experimenting with Focal Lengths
                                                                                                                                                                                            • Lab Reflections of Reflections
                                                                                                                                                                                              • Section 4 Light and Color
                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                • Lab Design Your Own - Blocking Noise Pollution
                                                                                                                                                                                                • Science and Language Arts A Haiku Garden The Four Seasons in Poems and Print
                                                                                                                                                                                                  • Chapter 11 Study Guide
                                                                                                                                                                                                  • Chapter 11 Review
                                                                                                                                                                                                  • Chapter 11 Standardized Test Practice
                                                                                                                                                                                                    • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                      • Launch Lab Global Jigsaw Puzzle
                                                                                                                                                                                                      • Foldables
                                                                                                                                                                                                      • Section 1 Evolution of Earths Crust
                                                                                                                                                                                                        • Applying Math Spreading Distances
                                                                                                                                                                                                        • Integrate Physics
                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                          • Section 2 Earthquakes
                                                                                                                                                                                                            • MiniLAB Demonstrating Four Types of Stress
                                                                                                                                                                                                            • Visualizing Earthquake-Proof Buildings
                                                                                                                                                                                                              • Section 3 Earths Interior
                                                                                                                                                                                                              • Section 4 Volcanoes
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • MiniLAB Modeling Lava Viscosity
                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                • Lab A Case for Pacific Plate Motion
                                                                                                                                                                                                                • Lab Earthquake Earthquake Wheres the earthquake
                                                                                                                                                                                                                • Science and History Volcano Weather
                                                                                                                                                                                                                  • Chapter 12 Study Guide
                                                                                                                                                                                                                  • Chapter 12 Review
                                                                                                                                                                                                                  • Chapter 12 Standardized Test Practice
                                                                                                                                                                                                                      • Unit 4 Forms of Energy
                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                          • Launch Lab Electric Circuits
                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                          • Section 1 Electric Charge
                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                            • Visualizing Lightning
                                                                                                                                                                                                                            • MiniLAB Investigate Charged Objects
                                                                                                                                                                                                                              • Section 2 Electric Current
                                                                                                                                                                                                                                • MiniLAB Investigating Battery Addition
                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                • Lab Identifying Conductors and Insulators
                                                                                                                                                                                                                                  • Section 3 Electrical Energy
                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                    • Applying Math Power Used by a Clothes Dryer
                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                    • Applying Math Electrical Energy Used by a Microwave Oven
                                                                                                                                                                                                                                    • Lab Design Your Own - Comparing Series and Parallel Circuits
                                                                                                                                                                                                                                    • Science and Language Arts Invisible Man
                                                                                                                                                                                                                                      • Chapter 13 Study Guide
                                                                                                                                                                                                                                      • Chapter 13 Review
                                                                                                                                                                                                                                      • Chapter 13 Standardized Test Practice
                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                          • Launch Lab The Strength of Magnets
                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                          • Section 1 Magnetism
                                                                                                                                                                                                                                            • MiniLAB Observing Magnetic Interference
                                                                                                                                                                                                                                            • Integrate Earth Science
                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                            • Applying Science How can magnetic parts of a junk car be salvaged
                                                                                                                                                                                                                                            • MiniLAB Making Your Own Compass
                                                                                                                                                                                                                                              • Section 2 Electricity and Magnetism
                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                  • Section 3 Producing Electric Current
                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                    • Visualizing Motors and Generators
                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                    • Lab Electricity and Magnetism
                                                                                                                                                                                                                                                    • Lab Design Your Own - Controlling Electromagnets
                                                                                                                                                                                                                                                    • Science and History Body Art
                                                                                                                                                                                                                                                      • Chapter 14 Study Guide
                                                                                                                                                                                                                                                      • Chapter 14 Review
                                                                                                                                                                                                                                                      • Chapter 14 Standardized Test Practice
                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                          • Launch Lab Can electromagnetic waves change materials
                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                          • Section 1 What are electromagnetic waves
                                                                                                                                                                                                                                                            • MiniLAB Investigating Electromagnetic Waves
                                                                                                                                                                                                                                                            • Applying Math The Speed of Light in Water
                                                                                                                                                                                                                                                              • Section 2 The Electromagnetic Spectrum
                                                                                                                                                                                                                                                                • MiniLAB Heating with Microwaves
                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                • Lab The Shape of Satellite Dishes
                                                                                                                                                                                                                                                                  • Section 3 Radio Communication
                                                                                                                                                                                                                                                                    • Visualizing Radio Broadcasts
                                                                                                                                                                                                                                                                    • Integrate Career
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                    • Lab Use the Internet - Radio Frequencies
                                                                                                                                                                                                                                                                    • Science and History Riding a Beam of Light
                                                                                                                                                                                                                                                                      • Chapter 15 Study Guide
                                                                                                                                                                                                                                                                      • Chapter 15 Review
                                                                                                                                                                                                                                                                      • Chapter 15 Standardized Test Practice
                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                          • Launch Lab Heating with Solar Energy
                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                          • Section 1 Fossil Fuels
                                                                                                                                                                                                                                                                            • Visualizing The Formation of Fossil Fuels
                                                                                                                                                                                                                                                                            • MiniLAB Designing an Efficient Water Heater
                                                                                                                                                                                                                                                                              • Section 2 Nuclear Energy
                                                                                                                                                                                                                                                                                • Integrate Earth Science
                                                                                                                                                                                                                                                                                • Integrate Social Science
                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                • Applying Science Can a contaminated radioactive site be reclaimed
                                                                                                                                                                                                                                                                                  • Section 3 Renewable Energy Sources
                                                                                                                                                                                                                                                                                    • MiniLAB Using Solar Power at Home
                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                    • Lab Solar Heating
                                                                                                                                                                                                                                                                                    • Lab Use the Internet How much does energy really cost
                                                                                                                                                                                                                                                                                    • Science and Society Reacting to Nuclear Energy
                                                                                                                                                                                                                                                                                      • Chapter 16 Study Guide
                                                                                                                                                                                                                                                                                      • Chapter 16 Review
                                                                                                                                                                                                                                                                                      • Chapter 16 Standardized Test Practice
                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                          • Lab Atmospheric Pressure
                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                          • Section 1 Earths Atmosphere
                                                                                                                                                                                                                                                                                            • MiniLAB Visualizing Convection
                                                                                                                                                                                                                                                                                            • Integrate Life Science
                                                                                                                                                                                                                                                                                            • Lab Visualizing a Temperature Inversion
                                                                                                                                                                                                                                                                                              • Section 2 Weather
                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Coriolis Effect
                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                  • Section 3 Climate
                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                    • Visualizing Earths Biogeophysical System
                                                                                                                                                                                                                                                                                                      • Section 4 Earths Changing Climates
                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                        • Applying Math Carbon Dioxide (CO2) Concentration
                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Investigating Microclimate
                                                                                                                                                                                                                                                                                                        • Science and Language Arts The Grapes of Wrath
                                                                                                                                                                                                                                                                                                          • Chapter 17 Study Guide
                                                                                                                                                                                                                                                                                                          • Chapter 17 Review
                                                                                                                                                                                                                                                                                                          • Chapter 17 Standardized Test Practice
                                                                                                                                                                                                                                                                                                              • Unit 5 Matter and Earth Materials
                                                                                                                                                                                                                                                                                                                • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                  • Launch Lab Demonstrate the Distillation of Water
                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                  • Section 1 Composition of Matter
                                                                                                                                                                                                                                                                                                                    • Visualizing Elements
                                                                                                                                                                                                                                                                                                                    • MiniLAB Classifying Materials
                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                    • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                    • Lab Comparing Pure Substances and Mixtures
                                                                                                                                                                                                                                                                                                                      • Section 2 Properties of Matter
                                                                                                                                                                                                                                                                                                                        • Integrate Environment
                                                                                                                                                                                                                                                                                                                        • MiniLAB Separating Ink
                                                                                                                                                                                                                                                                                                                        • Integrate History
                                                                                                                                                                                                                                                                                                                        • Integrate Earth Science
                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                        • Applying Math The Law of Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Lab Design Your Own - Measuring the Conservation of Mass
                                                                                                                                                                                                                                                                                                                        • Science Stats Intriguing Elements
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Study Guide
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Review
                                                                                                                                                                                                                                                                                                                          • Chapter 18 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                            • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                              • Launch Lab Inferring What You Cant Observe
                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                              • Section 1 Structure of the Atom
                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling an Aluminum Atom
                                                                                                                                                                                                                                                                                                                                • Visualizing The Atomic Model
                                                                                                                                                                                                                                                                                                                                  • Section 2 Masses of Atoms
                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                    • Applying Science How can radioactive isotopes help tell time
                                                                                                                                                                                                                                                                                                                                      • Section 3 The Periodic Table
                                                                                                                                                                                                                                                                                                                                        • MiniLAB Organizing a Personal Periodic Table
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Career
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                        • Integrate Astronomy
                                                                                                                                                                                                                                                                                                                                        • Lab A Periodic Table of Foods
                                                                                                                                                                                                                                                                                                                                        • Lab Use the Internet Whats in a name
                                                                                                                                                                                                                                                                                                                                        • Science and History A Chilling Story
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Study Guide
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Review
                                                                                                                                                                                                                                                                                                                                          • Chapter 19 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                            • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                              • Launch Lab Earth Materials at Home and School
                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                              • Section 1 Minerals
                                                                                                                                                                                                                                                                                                                                                • MiniLAB Identifying Salts Crystal System
                                                                                                                                                                                                                                                                                                                                                • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                • Lab Be a Mineral Detective
                                                                                                                                                                                                                                                                                                                                                  • Section 2 Igneous Rocks
                                                                                                                                                                                                                                                                                                                                                    • Applying Math Extrusive Igneous Rock Classification
                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                      • Section 3 Sedimentary Rocks
                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Evaporites
                                                                                                                                                                                                                                                                                                                                                          • Section 4 Metamorphic Rocks and the Rock Cycle
                                                                                                                                                                                                                                                                                                                                                            • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                            • Visualizing Shock Metamorphic Rock
                                                                                                                                                                                                                                                                                                                                                            • Lab Identifying Rocks
                                                                                                                                                                                                                                                                                                                                                            • Science and Society Earth Materials at Work
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Study Guide
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Review
                                                                                                                                                                                                                                                                                                                                                              • Chapter 20 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                  • Launch Lab Have you got the time
                                                                                                                                                                                                                                                                                                                                                                  • Foldables
                                                                                                                                                                                                                                                                                                                                                                  • Section 1 Weathering and Soil
                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing a Disappearing Seasoning
                                                                                                                                                                                                                                                                                                                                                                    • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                    • Lab Graphing Soil Textures
                                                                                                                                                                                                                                                                                                                                                                      • Section 2 Shaping the Landscape
                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling Runoff
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                          • Section 3 Groundwater
                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Porosity Volume
                                                                                                                                                                                                                                                                                                                                                                            • Visualizing The Role of Groundwater in Shaping Earths Surface
                                                                                                                                                                                                                                                                                                                                                                            • Integrate Environment
                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                              • Section 4 Geologic Time
                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                • Integrate Physics
                                                                                                                                                                                                                                                                                                                                                                                • Lab Its about time - relative that is
                                                                                                                                                                                                                                                                                                                                                                                • Science and Society Tapping into the Underground
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Review
                                                                                                                                                                                                                                                                                                                                                                                  • Chapter 21 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                      • Unit 6 Interactions of Matter
                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                          • Lab Chemical Bonds and Mixing
                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Stability in Bonding
                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                            • Lab Atomic Trading Cards
                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Types of Bonds
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Health
                                                                                                                                                                                                                                                                                                                                                                                                • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Observing a Bond Type
                                                                                                                                                                                                                                                                                                                                                                                                • Visualizing Polar Molecules
                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Writing Formulas and Naming Compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math Determining a Formula
                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Science Can you name binary ionic compounds
                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Making a Hydrate
                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Model and Invent - Modeling Chemical Bonding
                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Sticky Subject
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Review
                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 22 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab RustingmdashA Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 Chemical Changes
                                                                                                                                                                                                                                                                                                                                                                                                            • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Designing a Team Equation
                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Chemical Equations
                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math Barium Sulfate Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Classifying Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 4 Reaction Rates and Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing Chemical Energy
                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Creating a Colorful Chemical Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab To Glow or Not to Glow
                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Investigating Reaction Conditions
                                                                                                                                                                                                                                                                                                                                                                                                                    • Oops Accidents in Science A Clumsy Move Pays Off
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Review
                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter 23 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                          • Launch Lab Magic Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                          • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 1 How Solutions Form
                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Career
                                                                                                                                                                                                                                                                                                                                                                                                                            • Visualizing Metal Alloys
                                                                                                                                                                                                                                                                                                                                                                                                                            • MiniLAB Observing the Effect of Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                            • Applying Math Surface Area
                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 2 Solubility and Concentration
                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Acids Bases and Salts
                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Observing Acid Relief
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Strength of Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Determining Acidity
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Saturated Solutions
                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and Society Acid Rain
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 24 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab The Size of a Nucleus
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling the Strong Force
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Nuclear Decay
                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 3 Detecting Radioactivity
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Applying Math The Age of Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Social Studies
                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 4 Nuclear Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • MiniLAB Modeling a Nuclear Reaction
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Integrate Chemistry
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Visualizing PET Scans
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Chain Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Lab Model and Invent Modeling Transmutations
                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science and History The Nuclear Alchemist
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Chapter 25 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Chapter 26 Stars and Galaxies
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Launch Lab Stars in the Sky
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Section 1 Observing the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Integrate History
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • MiniLAB Modeling a Telescope
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Applying Math The Magnifying Power of Telescopes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Section 2 Evolution of Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • MiniLAB Counting Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Visualizing H-R Diagrams of Star Clusters
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Integrate Life Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Lab Star Cluster Age
                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Section 3 Galaxies and the Milky Way
                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Science Online
                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Section 4 Cosmology
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Integrate Language Arts
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Lab Model and Invent - Expansion of the Universe
                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Science and Language Arts Stars
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Study Guide
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Chapter 26 Standardized Test Practice
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  • Student Resources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Science Skill Handbook
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Scientific Methods
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Safety Symbols
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Safety in the Science Laboratory
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Math Skill Handbook
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Math Review
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Science Applications
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Formulas
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Extra Math Problems
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Reference Handbook
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Rocks
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Minerals
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Physical Science Reference Tables
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Periodic Table of the Elements
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              • Weather Map Symbols
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                • EnglishSpanish Glossary
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Index
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                • Credits
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    • Students Workbooks
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      • Chapter Resources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 1 The Nature of Science
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 2 Science Technology and Society
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 3 Motion Acceleration and Forces
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 4 The Laws of Motion
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 5 Energy
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 6 Work and Machines
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 7 The Earth-Moon-Sun System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 8 The Solar System
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 9 Heat and States of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 10 Waves
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 11 Sound and Light
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 12 Earths Internal Processes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 13 Electricity
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 14 Magnetism
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 15 Electromagnetic Radiation
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 16 Energy Sources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 17 Weather and Climate
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 18 Classification of Matter
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 19 Properties of Atoms and the Periodic Table
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 20 Earth Materials
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 21 Earths Changing Surface
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 22 Chemical Bonds
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 23 Chemical Reactions
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 24 Solutions Acids and Bases
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 25 Nuclear Changes
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        • Chapter 26 Stars and Galaxies
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          • Additional Resources
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Dinah Zikes Teaching Science with Foldables
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Laboratory Activities Manual
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Mastering Standardized Tests
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Mathematics Skill Activities
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Probeware Labs
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Reading and Writing in the Science Classroom
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Reading and Writing Skill Activities
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Reading Essentials
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Science Inquiry Labs
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Science Notebook
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            • Study Guide and Reinforcement
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